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I am using a NSRulerView in MacOS in order to display line numbers next to a NSTextView.
Both views share the same font and the same font size, however while in NSTextView string rendering is automatically managed, in the NSRulerView I need to compute correct line number (and this part works fine) and then render the string inside a drawHashMarksAndLabelsInRect.
My issue is that I am unable to correctly align text between the two views. For some font it works fine while for other fonts there are visible differences.
The code I am actually using is:
#define BTF_RULER_WIDTH 40.0f
#define BTF_RULER_PADDING 5.0f
static inline void drawLineNumber(NSUInteger lineNumber, CGFloat y, NSDictionary *attributes, CGFloat ruleThickness) {
NSString *string = [[NSNumber numberWithUnsignedInteger:lineNumber] stringValue];
NSAttributedString *attString = [[NSAttributedString alloc] initWithString:string attributes:attributes];
NSUInteger x = ruleThickness - BTF_RULER_PADDING - attString.size.width;
[attString drawAtPoint:NSMakePoint(x, y)];
}
static inline NSUInteger countNewLines(NSString *s, NSUInteger location, NSUInteger length) {
CFStringInlineBuffer inlineBuffer;
CFStringInitInlineBuffer((__bridge CFStringRef)s, &inlineBuffer, CFRangeMake(location, length));
NSUInteger counter = 0;
for (CFIndex i=0; i < length; ++i) {
UniChar c = CFStringGetCharacterFromInlineBuffer(&inlineBuffer, i);
if (c == (UniChar)'\n') ++counter;
}
return counter;
}
#implementation BTFRulerView
- (instancetype)initWithBTFTextView:(BTFTextView *)textView {
self = [super initWithScrollView:textView.enclosingScrollView orientation:NSVerticalRuler];
if (self) {
self.clientView = textView;
// default settings
self.ruleThickness = BTF_RULER_WIDTH;
self.textColor = [NSColor grayColor];
}
return self;
}
- (void)drawHashMarksAndLabelsInRect:(NSRect)rect {
// do not use drawBackgroundInRect for background color otherwise a 1px right border with a different color appears
if (_backgroundColor) {
[_backgroundColor set];
[NSBezierPath fillRect:rect];
}
BTFTextView *textView = (BTFTextView *)self.clientView;
if (!textView) return;
NSLayoutManager *layoutManager = textView.layoutManager;
if (!layoutManager) return;
NSString *textString = textView.string;
if ((!textString) || (textString.length == 0)) return;
CGFloat insetHeight = textView.textContainerInset.height;
CGPoint relativePoint = [self convertPoint:NSZeroPoint fromView:textView];
NSDictionary *lineNumberAttributes = #{NSFontAttributeName: textView.font, NSForegroundColorAttributeName: _textColor};
NSRange visibleGlyphRange = [layoutManager glyphRangeForBoundingRect:textView.visibleRect inTextContainer:textView.textContainer];
NSUInteger firstVisibleGlyphCharacterIndex = [layoutManager characterIndexForGlyphAtIndex:visibleGlyphRange.location];
// line number for the first visible line
NSUInteger lineNumber = countNewLines(textString, 0, firstVisibleGlyphCharacterIndex)+1;
NSUInteger glyphIndexForStringLine = visibleGlyphRange.location;
// go through each line in the string
while (glyphIndexForStringLine < NSMaxRange(visibleGlyphRange)) {
// range of current line in the string
NSRange characterRangeForStringLine = [textString lineRangeForRange:NSMakeRange([layoutManager characterIndexForGlyphAtIndex:glyphIndexForStringLine], 0)];
NSRange glyphRangeForStringLine = [layoutManager glyphRangeForCharacterRange: characterRangeForStringLine actualCharacterRange:nil];
NSUInteger glyphIndexForGlyphLine = glyphIndexForStringLine;
NSUInteger glyphLineCount = 0;
while (glyphIndexForGlyphLine < NSMaxRange(glyphRangeForStringLine)) {
// check if the current line in the string spread across several lines of glyphs
NSRange effectiveRange = NSMakeRange(0, 0);
// range of current "line of glyphs". If a line is wrapped then it will have more than one "line of glyphs"
NSRect lineRect = [layoutManager lineFragmentRectForGlyphAtIndex:glyphIndexForGlyphLine effectiveRange:&effectiveRange withoutAdditionalLayout:YES];
// compute Y for line number
CGFloat y = NSMinY(lineRect) + relativePoint.y + insetHeight;
// draw line number only if string does not spread across several lines
if (glyphLineCount == 0) {
drawLineNumber(lineNumber, y, lineNumberAttributes, self.ruleThickness);
}
// move to next glyph line
++glyphLineCount;
glyphIndexForGlyphLine = NSMaxRange(effectiveRange);
}
glyphIndexForStringLine = NSMaxRange(glyphRangeForStringLine);
++lineNumber;
}
// draw line number for the extra line at the end of the text
if (layoutManager.extraLineFragmentTextContainer) {
CGFloat y = NSMinY(layoutManager.extraLineFragmentRect) + relativePoint.y + insetHeight;
drawLineNumber(lineNumber, y, lineNumberAttributes, self.ruleThickness);
}
}
I think that the issue is the y computation then passed to the drawLineNumber function. Any idea about how to correctly compute it?
I found a solution and I think it could be quite useful to others:
#define BTF_RULER_WIDTH 40.0f
#define BTF_RULER_PADDING 5.0f
static inline void drawLineNumberInRect(NSUInteger lineNumber, NSRect lineRect, NSDictionary *attributes, CGFloat ruleThickness) {
NSString *string = [[NSNumber numberWithUnsignedInteger:lineNumber] stringValue];
NSAttributedString *attString = [[NSAttributedString alloc] initWithString:string attributes:attributes];
NSUInteger x = ruleThickness - BTF_RULER_PADDING - attString.size.width;
// Offetting the drawing keeping into account the ascender (because we draw it without NSStringDrawingUsesLineFragmentOrigin)
NSFont *font = attributes[NSFontAttributeName];
lineRect.origin.x = x;
lineRect.origin.y += font.ascender;
[attString drawWithRect:lineRect options:0 context:nil];
}
static inline NSUInteger countNewLines(NSString *s, NSUInteger location, NSUInteger length) {
CFStringInlineBuffer inlineBuffer;
CFStringInitInlineBuffer((__bridge CFStringRef)s, &inlineBuffer, CFRangeMake(location, length));
NSUInteger counter = 0;
for (CFIndex i=0; i < length; ++i) {
UniChar c = CFStringGetCharacterFromInlineBuffer(&inlineBuffer, i);
if (c == (UniChar)'\n') ++counter;
}
return counter;
}
#implementation BTFRulerView
- (instancetype)initWithBTFTextView:(BTFTextView *)textView {
self = [super initWithScrollView:textView.enclosingScrollView orientation:NSVerticalRuler];
if (self) {
self.clientView = textView;
// default settings
self.ruleThickness = BTF_RULER_WIDTH;
self.textColor = [NSColor grayColor];
}
return self;
}
- (void)drawHashMarksAndLabelsInRect:(NSRect)rect {
// do not use drawBackgroundInRect for background color otherwise a 1px right border with a different color appears
if (_backgroundColor) {
[_backgroundColor set];
[NSBezierPath fillRect:rect];
}
BTFTextView *textView = (BTFTextView *)self.clientView;
if (!textView) return;
NSLayoutManager *layoutManager = textView.layoutManager;
if (!layoutManager) return;
NSString *textString = textView.string;
if ((!textString) || (textString.length == 0)) return;
CGFloat insetHeight = textView.textContainerInset.height;
CGPoint relativePoint = [self convertPoint:NSZeroPoint fromView:textView];
// Gettign text attributes from the textview
NSMutableDictionary *lineNumberAttributes = [[textView.textStorage attributesAtIndex:0 effectiveRange:NULL] mutableCopy];
lineNumberAttributes[NSForegroundColorAttributeName] = self.textColor;
NSRange visibleGlyphRange = [layoutManager glyphRangeForBoundingRect:textView.visibleRect inTextContainer:textView.textContainer];
NSUInteger firstVisibleGlyphCharacterIndex = [layoutManager characterIndexForGlyphAtIndex:visibleGlyphRange.location];
// line number for the first visible line
NSUInteger lineNumber = countNewLines(textString, 0, firstVisibleGlyphCharacterIndex)+1;
NSUInteger glyphIndexForStringLine = visibleGlyphRange.location;
// go through each line in the string
while (glyphIndexForStringLine < NSMaxRange(visibleGlyphRange)) {
// range of current line in the string
NSRange characterRangeForStringLine = [textString lineRangeForRange:NSMakeRange([layoutManager characterIndexForGlyphAtIndex:glyphIndexForStringLine], 0)];
NSRange glyphRangeForStringLine = [layoutManager glyphRangeForCharacterRange: characterRangeForStringLine actualCharacterRange:nil];
NSUInteger glyphIndexForGlyphLine = glyphIndexForStringLine;
NSUInteger glyphLineCount = 0;
while (glyphIndexForGlyphLine < NSMaxRange(glyphRangeForStringLine)) {
// check if the current line in the string spread across several lines of glyphs
NSRange effectiveRange = NSMakeRange(0, 0);
// range of current "line of glyphs". If a line is wrapped then it will have more than one "line of glyphs"
NSRect lineRect = [layoutManager lineFragmentRectForGlyphAtIndex:glyphIndexForGlyphLine effectiveRange:&effectiveRange withoutAdditionalLayout:YES];
// compute Y for line number
CGFloat y = ceil(NSMinY(lineRect) + relativePoint.y + insetHeight);
lineRect.origin.y = y;
// draw line number only if string does not spread across several lines
if (glyphLineCount == 0) {
drawLineNumberInRect(lineNumber, lineRect, lineNumberAttributes, self.ruleThickness);
}
// move to next glyph line
++glyphLineCount;
glyphIndexForGlyphLine = NSMaxRange(effectiveRange);
}
glyphIndexForStringLine = NSMaxRange(glyphRangeForStringLine);
++lineNumber;
}
// draw line number for the extra line at the end of the text
if (layoutManager.extraLineFragmentTextContainer) {
NSRect lineRect = layoutManager.extraLineFragmentRect;
CGFloat y = ceil(NSMinY(lineRect) + relativePoint.y + insetHeight);
lineRect.origin.y = y;
drawLineNumberInRect(lineNumber, lineRect, lineNumberAttributes, self.ruleThickness);
}
}
I use drawWithRect instead of drawAtPoint and I use the attributes directly from the connected textView.
Simple question on how to insert a line break using SKLabelNode class in SpriteKit. I have the following code but it does not work -
SKLabelNode *nerdText = [SKLabelNode labelNodeWithFontNamed:#"Times"];
NSString *st1 = #"Test break";
NSString *st2 = #"I want it to break";
NSString *test = [NSString stringWithFormat:#"%#,\r%#",st1,st2]; //Even tried \n
nerdText.text = test;
nerdText.fontSize = 11;
nerdText.fontColor = [SKColor colorWithRed:0.15 green:0.15 blue:0.3 alpha:1.0];
nerdText.position = CGPointMake(150.0, 250.0);
[self addChild:nerdText];
Please help me out!
I dont think you can, here is a "hack" way to do it
SKNode *nerdText = [SKNode node];
SKLabelNode *a = [SKLabelNode labelNodeWithFontNamed:#"Arial"];
a.fontSize = 16;
a.fontColor = [SKColor yellowColor];
SKLabelNode *b = [SKLabelNode labelNodeWithFontNamed:#"Arial"];
b.fontSize = 16;
b.fontColor = [SKColor yellowColor];
NSString *st1 = #"Line 1";
NSString *st2 = #"Line 2";
b.position = CGPointMake(b.position.x, b.position.y - 20);
a.text = st1;
b.text = st2;
[nerdText addChild:a];
[nerdText addChild:b];
nerdText.position = CGPointMake(150.0, 250.0);
[self addChild:nerdText];
I had the same problem. I created a drop-in replacement for SKLabelNode called DSMultilineLabelNode that supports word wrap, line breaks, etc. The underlying implementation draws the string into a graphics context and then applies that to a texture on an SKSpriteNode.
It's available on GitHub at:
https://github.com/downrightsimple/DSMultilineLabelNode
static func multipleLineText(labelInPut: SKLabelNode) -> SKLabelNode {
let subStrings:[String] = labelInPut.text!.componentsSeparatedByString("\n")
var labelOutPut = SKLabelNode()
var subStringNumber:Int = 0
for subString in subStrings {
let labelTemp = SKLabelNode(fontNamed: labelInPut.fontName)
labelTemp.text = subString
labelTemp.fontColor = labelInPut.fontColor
labelTemp.fontSize = labelInPut.fontSize
labelTemp.position = labelInPut.position
labelTemp.horizontalAlignmentMode = labelInPut.horizontalAlignmentMode
labelTemp.verticalAlignmentMode = labelInPut.verticalAlignmentMode
let y:CGFloat = CGFloat(subStringNumber) * labelInPut.fontSize
print("y is \(y)")
if subStringNumber == 0 {
labelOutPut = labelTemp
subStringNumber++
} else {
labelTemp.position = CGPoint(x: 0, y: -y)
labelOutPut.addChild(labelTemp)
subStringNumber++
}
}
return labelOutPut
}
As of iOS 11/ macOS 10.13, SKLabelNode has a numberOfLines property that behaves in a similar way to the one that UILabel has. By default it's set to 1. If you set it to zero, you can have an unlimited number of lines. See also lineBreakMode and preferredMaxLayoutWidth. I thought it was worth pointing this out here in case anyone arrives at this page before they see the Apple documentation. If your minimum build target is iOS 11/ macOS 10.13, you don't need the helper methods posted above.
Here is another five minute hack by yours truly. It's not too bad.
+(SKSpriteNode*)spritenodecontaininglabelsFromStringcontainingnewlines:(NSString*)text fontname:(NSString*)fontname fontcolor:(NSColor*)colorFont fontsize:(const CGFloat)SIZEFONT verticalMargin:(const CGFloat)VERTICALMARGIN emptylineheight:(const CGFloat)EMPTYLINEHEIGHT {
NSArray* strings = [text componentsSeparatedByString:#"\n"];
//DLog(#"string count: %lu", (unsigned long)strings.count);
NSColor* color = NSColor.clearColor;
#ifdef DEBUG
color = [NSColor colorWithCalibratedRed:1 green:0 blue:0 alpha:0.5];
#endif
SKSpriteNode* spritenode = [SKSpriteNode spriteNodeWithColor:color size:CGSizeMake(0, 0)];
CGFloat totalheight = 0;
CGFloat maxwidth = 0;
NSMutableArray* labels = [NSMutableArray array];
for (NSUInteger i = 0; i < strings.count; i++) {
NSString* str = [strings objectAtIndex:i];
const BOOL ISEMPTYLINE = [str isEqualToString:#""];
if (!ISEMPTYLINE) {
SKLabelNode* label = [SKLabelNode labelNodeWithFontNamed:fontname];
label.text = str;
label.fontColor = colorFont;
label.fontSize = SIZEFONT;
const CGSize SIZEOFLABEL = [label calculateAccumulatedFrame].size;
if (SIZEOFLABEL.width > maxwidth)
maxwidth = SIZEOFLABEL.width;
totalheight += SIZEOFLABEL.height;
[labels addObject:label];
}
else {
totalheight += EMPTYLINEHEIGHT;
[labels addObject:[NSNull null]];
}
if (i + 1 < strings.count)
totalheight += VERTICALMARGIN;
}
spritenode.size = CGSizeMake(maxwidth, totalheight);
//DLog(#"spritenode total size: %#", NSStringFromSize(spritenode.size));
CGFloat y = spritenode.size.height * 0.5;
const CGFloat X = 0;
for (NSUInteger i = 0; i < strings.count; i++) {
id obj = [labels objectAtIndex:i];
if ([obj isKindOfClass:SKLabelNode.class]) {
SKLabelNode* label = obj;
label.verticalAlignmentMode = SKLabelVerticalAlignmentModeTop;
label.position = ccp(X, y);
[spritenode addChild:label];
const CGSize SIZEOFLABEL = [label calculateAccumulatedFrame].size;
y -= SIZEOFLABEL.height;
}
else {
y -= EMPTYLINEHEIGHT;
}
if (i + 1 < labels.count)
y -= VERTICALMARGIN;
}
return spritenode;
}
Btw you will need
static inline CGPoint ccp( CGFloat x, CGFloat y )
{
return CGPointMake(x, y);
}
So after doing a bit of research I learned that SkLabelNode was not intended to have multiline strings involved. Since functionality is limited with SKLabelNode it makes more sense to simply use a UILabel to hold the place of your text. Learning how to smoothly implement UI elements into sprite kit has made life a whole lot easier. UI elements are created programmatically, and added to your scene by using
[self.view addsubview:(your UIelement)];
So all you have to do
1.Initialize an instance of the UIelement in this case a UIlabel
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(50, 50, 100, 100)];
label.backgroundColor = [UIColor whiteColor];
label.textColor = [UIColor blackColor];
label.text = #"helllllllllo";
2. After you have created your UIelement just add it TO THE VIEW Using the method described above
3.I have found it important to note that UI elements and SK elements do not interact the same when it comes to positioning. There are some simple methods provided such as convertPointToView:
-(CGPoint)convertPointToView(CGPoint);
To help when it comes to converting points. I hope that helped Good Luck!
I wrote a solution for Swift 3.
An Xcode demo project is available on the open source GitHub project: https://github.com/benmorrow/Multilined-SKLabelNode
Here's the SKLabelNode extension:
extension SKLabelNode {
func multilined() -> SKLabelNode {
let substrings: [String] = self.text!.components(separatedBy: "\n")
return substrings.enumerated().reduce(SKLabelNode()) {
let label = SKLabelNode(fontNamed: self.fontName)
label.text = $1.element
label.fontColor = self.fontColor
label.fontSize = self.fontSize
label.position = self.position
label.horizontalAlignmentMode = self.horizontalAlignmentMode
label.verticalAlignmentMode = self.verticalAlignmentMode
let y = CGFloat($1.offset - substrings.count / 2) * self.fontSize
label.position = CGPoint(x: 0, y: -y)
$0.addChild(label)
return $0
}
}
}
Here's how you use it:
let text = "hot dogs\ncold beer\nteam jerseys"
let singleLineMessage = SKLabelNode()
singleLineMessage.fontSize = min(size.width, size.height) /
CGFloat(text.components(separatedBy: "\n").count) // Fill the screen
singleLineMessage.verticalAlignmentMode = .center // Keep the origin in the center
singleLineMessage.text = text
let message = singleLineMessage.multilined()
message.position = CGPoint(x: frame.midX, y: frame.midY)
message.zPosition = 1001 // On top of all other nodes
addChild(message)
Here's what the app looks like:
The alternative is to create a bitmap version of the text, then use the resulting image with a SKSpriteNode.
It's easier than it sounds.
An example, assume we have a string or an attributed string and a CGSize variable with the size of the resulting text area.
CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
// Assuming size is in actual pixels. Multiply size by the retina scaling
// factor if not.
CGContextRef context = CGBitmapContextCreate(NULL, (size_t)round(size.width), (size_t)round(size.height), 8, (size_t)round(size.width) * 4, rgbColorSpace, (CGBitmapInfo)kCGImageAlphaPremultipliedLast);
CGColorSpaceRelease(rgbColorSpace);
// Draw text, potentially flipping the coordinate system before
// (depending on methods you use).
// Make sure that you draw the font twice as big for retina.
// E.g. [#"My text" drawInRect:rect withAttributes:attr];
// Once we have drawn the text, simply extract the image and
// Make a texture from it.
CGImageRef image = CGBitmapContextCreateImage(context);
SKTexture *texture = [SKTexture textureWithCGImage:image];
CGImageRelease(image);
CGContextRelease(context);
// Texture created, so make a sprite node to use it.
SKSpriteNode *node = [self node];
node.texture = texture;
// Set the node size to the size in non-retina pixels, so if size was with
// scale factor already multiplied in, then we would need to divide by the scale
// factor.
node.size = size;
Here just to contribute my solution. I find myself wanting the same thing - to make multilines of SKLabelNode from a long string. Creating it one by one and manually positioning them is non practical. So I made an easier way to make multiline SKLabelNode. This method uses SKLabelNodes (and not capturing text into image).
Please see my solution if you are interested:
http://xcodenoobies.blogspot.com/2014/12/multiline-sklabelnode-hell-yes-please-xd.html
The result:
Lots of nice solutions here, but I didn't see any written in swift, so here we go. this function will take in one long string, and break it up where you place \n characters.
func createMultiLineText(textToPrint:String, color:UIColor, fontSize:CGFloat, fontName:String, fontPosition:CGPoint, fontLineSpace:CGFloat)->SKNode{
// create node to hold the text block
var textBlock = SKNode()
//create array to hold each line
let textArr = textToPrint.componentsSeparatedByString("\n")
// loop through each line and place it in an SKNode
var lineNode: SKLabelNode
for line: String in textArr {
lineNode = SKLabelNode(fontNamed: fontName)
lineNode.text = line
lineNode.fontSize = fontSize
lineNode.fontColor = color
lineNode.fontName = fontName
lineNode.position = CGPointMake(fontPosition.x,fontPosition.y - CGFloat(textBlock.children.count ) * fontSize + fontLineSpace)
textBlock.addChild(lineNode)
}
// return the sknode with all of the text in it
return textBlock
}
So I know this question is a little older, but just incase any comes back to it like I have, there's now a property preferredMaxLayoutWidth that you can use in conjunction with lineBreakMode and numberOfLines:
Example:
let longMessage = "Super super super super super super super super super long text"
let label = SKLabelNode(fontNamed: "Thonburi")
label.text = longMessage
label.fontSize = 24
label.fontColor = SKColor.black
// set preferredMaxLayoutWidth to the width of the SKScene
label.preferredMaxLayoutWidth = size.width
label.lineBreakMode = .byWordWrapping
label.numberOfLines = 0
addChild(label)
Like several others I have implemented a solution to this problem myself. It's a simple SKLabelNode subclass which can be used as a replacement for the regular SKLabelNode. I find subclassing the best approach for this functionality as I use it "everywhere" "all" the time...
The whole thing is available at github (for anyone interested) but the main gist is as follows: It separates the string and creates regular SKLabelNode instances and ads these as children of the node. This is done whenever setText: is invoked:
- (void)setText:(NSString *)text{
self.subNodes = [self labelNodesFromText:text];
[self removeAllChildren];
for (SKLabelNode *childNode in self.subNodes) {
[self addChild:childNode];
}
_text = #""; // (synthesized in the implementation)
}
The label subnodes are created here:
- (NSArray *)labelNodesFromText:(NSString *)text{
NSArray *substrings = [text componentsSeparatedByString:#"\n"];
NSMutableArray *labelNodes = [[NSMutableArray alloc] initWithCapacity:[substrings count]];
NSUInteger labelNumber = 0;
for (NSString *substring in substrings) {
SKLabelNode *labelNode = [SKLabelNode labelNodeWithFontNamed:self.fontName];
labelNode.text = substring;
labelNode.fontColor = self.fontColor;
labelNode.fontSize = self.fontSize;
labelNode.horizontalAlignmentMode = self.horizontalAlignmentMode;
labelNode.verticalAlignmentMode = self.verticalAlignmentMode;
CGFloat y = self.position.y - (labelNumber * self.fontSize * kLineSpaceMultiplier); // kLineSpaceMultiplier is a float constant. 1.5 is the value I have chosen
labelNode.position = CGPointMake(self.position.x, y);
labelNumber++;
[labelNodes addObject:labelNode];
}
return [labelNodes copy];
}
As you might have noticed I also have a property subNodes (array). This comes in handy elsewhere as the full implementation also allows for changing any of properties with the regular SKLabelNode syntax. (Text, fontName, fontSize, alignment etc.)
If anyone is interested, I've created a better SKLabelNode called SKLabelNodePlus that has multi-line support like Chris Allwein's but also has other features I find pretty useful.
Check it out on GitHub:
https://github.com/MKargin0/SKLabelNodePlus
Using https://github.com/downrightsimple/DSMultilineLabelNode and How to write text on image in Objective-C (iOS)? for reference this is what I did for a quick and dirty way to get a text-wrapping SKNode (Xcode 7.1.1):
-(SKNode*)getWrappingTextNode:(NSString*)text maxWidth:(CGFloat)width {
UIImage *img = [self drawText:text widthDimension:width];
return [SKSpriteNode spriteNodeWithTexture:[SKTexture textureWithImage:img]];
}
-(UIImage*)drawText:(NSString*)text widthDimension:(CGFloat)width {
NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
paragraphStyle.alignment = NSTextAlignmentLeft; //or whatever alignment you want
UIFont *font = [UIFont fontWithName:#"Verdana" size:22]; //or whatever font you want
NSDictionary *att = #{NSFontAttributeName:font, NSParagraphStyleAttributeName: paragraphStyle};
//using 800 here but make sure this height is greater than the potential height of the text (unless you want a max-height I guess but I did not test max-height)
CGRect rect = [text boundingRectWithSize:CGSizeMake(width, 800) options:NSStringDrawingUsesLineFragmentOrigin attributes:att context:nil];
UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0.0f);
[text drawInRect:rect withAttributes:att];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
Here is a quick and easy function I wrote to just make life easier.
Step 1) Pass in a string, get a SKSpriteNode.
Step 2) Add sprite node to scene.
/******************************************************************************/
- (SKSpriteNode*) ConvertString: (NSString*) str
WithFontSize: (NSInteger) font_size
ToParagraphWithSize: (CGSize) para_size
{
SKSpriteNode* paragraph = [[SKSpriteNode alloc] initWithColor: [SKColor clearColor]
size: para_size];
// Set the anchor point to the top left corner. This is where English
// paragraphs usually start
paragraph.anchorPoint = CGPointMake(0,1);
// Create an array to hold multilple sub strings. These sub strings will
// become multiple SKLabels that will be added to the paragraph sprite node
// created above
NSMutableArray* str_arr = [[NSMutableArray alloc] init];
// Lets separate words by a single space.
NSArray* word_arr = [str componentsSeparatedByString:#" "];
// 50% is an approximate character height to width ratio. Change this
// number to adjust the number of characters per line you would like.
// Increase it if you have a lot of capitol W's
float est_char_width = font_size * 0.50;
NSInteger num_char_per_line = para_size.width / est_char_width;
// For every word in the original string, make sure it fits on the line
// then add it to the string array.
NSString* temp_str = #"";
for (NSString* word in word_arr)
{
if ((NSInteger)word.length <= num_char_per_line - (NSInteger)temp_str.length)
{
temp_str = [NSString stringWithFormat:#"%# %#", temp_str, word];
}
else
{
[str_arr addObject: temp_str];
temp_str = word;
}
}
[str_arr addObject: temp_str];
// For every sub string, create a label node and add it to the paragraph
for (int i = 0; i < str_arr.count; i++)
{
NSString* sub_str = [str_arr objectAtIndex: i];
SKLabelNode* label = [self CreateLabelWithText: sub_str];
label.fontSize = 14;
label.position = CGPointMake(0, -(i+1) * font_size);
[paragraph addChild: label];
}
return paragraph;
}
/******************************************************************************/
- (SKLabelNode*) CreateLabelWithText: (NSString*) str
{
enum alignment
{
CENTER,
LEFT,
RIGHT
};
SKLabelNode* label;
label = [SKLabelNode labelNodeWithFontNamed:#"ChalkboardSE-Light"];
label.name = #"label_name";
label.text = str;
label.zPosition = 1;
label.horizontalAlignmentMode = LEFT;
label.fontColor = [SKColor whiteColor];
return label;
}
I have written a utility method to take a string and divide it up into an array of strings with a given maximum length. It automatically ends each line with a whole word and removes leading whitespace. Hope it helps somebody!
- (NSArray*)linesFromString:(NSString*)string withMaxLineLength:(int)maxLineLength;
{
NSMutableArray *lines = [NSMutableArray arrayWithCapacity:1];
BOOL gotLine = NO;
BOOL doneFormat = NO;
BOOL endOfString = NO;
int innerLoops = 0;
int outerLoops = 0;
int lineIndex = 0;
int currentStringIndex = 0;
int stringLength = (int)[string length];
int rangeLength = maxLineLength;
NSString *line;
NSString *testChar;
NSString *testChar2;
while (!doneFormat) {
outerLoops++;
while (!gotLine) {
endOfString = NO;
innerLoops++;
line = [string substringWithRange:NSMakeRange(currentStringIndex, rangeLength)];
testChar = [line substringWithRange:NSMakeRange(0, 1)];
if (currentStringIndex + rangeLength > [string length] - 1) {
endOfString = YES;
} else {
testChar2 = [string substringWithRange:NSMakeRange(currentStringIndex + rangeLength, 1)];
}
//If the line starts with a space then advance 1 char and try again.
if ([testChar isEqualToString:#" "]) {
currentStringIndex++;
// If we were at the end of the string then reduce the rangeLength as well.
if (endOfString) {
rangeLength--;
}
// else, if this line ends at the end of a word (or the string) then it's good. ie next char in the string is a space.
} else if ([testChar2 isEqualToString:#" "] || endOfString) {
gotLine = YES;
currentStringIndex += [line length];
// else, make the line shorter by one character and try again
} else if (rangeLength > 1){
rangeLength--;
// Otherwise the word takes up more than 1 line so use it all.
} else {
line = [string substringWithRange:NSMakeRange(currentStringIndex, maxLineLength)];
currentStringIndex += [line length];
gotLine = YES;
}
// Make sure we're not stuck in an endless loop
if (innerLoops > 1000) {
NSLog(#"Error: looped too long");
break;
}
}
// If we processed a line, and the line is not nil, add it to our array.
if (gotLine && line) {
[lines insertObject:line atIndex:lineIndex];
lineIndex++;
}
// Reset variables
rangeLength = maxLineLength;
gotLine = NO;
// If the current index is at the end of the string, then we're done.
if (currentStringIndex >= stringLength) {
doneFormat = YES;
// If we have less than a full line left, then reduce the rangeLength to avoid throwing an exception
} else if (stringLength - (currentStringIndex + rangeLength) < 0) {
rangeLength = stringLength - currentStringIndex;
}
// Make sure we're not stuck in an endless loop
if (outerLoops > 1000) {
NSLog(#"Error: Outer-looped too long");
break;
}
}
return lines;
}
And then I just call it and create some label nodes to add to my layer node as follows. I'm aligning my line labels underneath and with the left edge of button2, so it all lines up left justified.
CGFloat fontSize = 30.0f;
int lineCount;
NSString *description = [product localizedDescription];
NSString *line;
NSArray *lines = [self linesFromString:description withMaxLineLength:43];
if (lines) {
lineCount = (int)[lines count];
for (int i = 0; i < lineCount; i++) {
line = [lines objectAtIndex:i];
// Create a new label for each line and add it to my SKSpriteNode layer
SKLabelNode *label = [SKLabelNode labelNodeWithFontNamed:#"Superclarendon-Black"];
label.text = line;
label.fontSize = fontSize;
label.scale = 1.0f;
label.name = #"lineLabel";
label.fontColor = [UIColor blackColor];
label.horizontalAlignmentMode = SKLabelHorizontalAlignmentModeLeft;
label.position = CGPointMake(button2.position.x - button2.size.width * 0.5f, button2.position.y - button2.size.height - i * fontSize * 1.1);
[layer addChild:label];
}
}
In the scene editor, change the SKLabelNode's text to attributed in the attributes inspector in the right pane, as shown below.
Doing so will give you very much freedom to customize the text that is displayed without having to create multiple SKLabelNode instances or a UIImage. For instance, you can create a paragraph as shown below.
For programmatic interaction, use the attributedString property of the label node to add custom attributes.
label.numberOfLines = 0 //equates to multiple lines
label.numberOfLines.preferredMaxLayoutWidth = screenWidth
Im trying to get the least used color, and the most used color from MP3 file's album artwork for a music playing application. I need the colors to do an effect like the new itunes 11. Where the background color of the menu is the most used color, and the least used color is the color for song labels and artist name.
I am using
`- (UIColor*) getPixelColorAtLocation:(CGPoint)point {
UIColor* color = nil;
CGImageRef inImage = self.image.CGImage;
// Create off screen bitmap context to draw the image into. Format ARGB is 4 bytes for each pixel: Alpa, Red, Green, Blue
CGContextRef cgctx = [self createARGBBitmapContextFromImage:inImage];
if (cgctx == NULL) { return nil; /* error */ }
size_t w = CGImageGetWidth(inImage);
size_t h = CGImageGetHeight(inImage);
CGRect rect = {{0,0},{w,h}};
// Draw the image to the bitmap context. Once we draw, the memory
// allocated for the context for rendering will then contain the
// raw image data in the specified color space.
CGContextDrawImage(cgctx, rect, inImage);
// Now we can get a pointer to the image data associated with the bitmap
// context.
unsigned char* data = CGBitmapContextGetData (cgctx);
if (data != NULL) {
//offset locates the pixel in the data from x,y.
//4 for 4 bytes of data per pixel, w is width of one row of data.
int offset = 4*((w*round(point.y))+round(point.x));
int alpha = data[offset];
int red = data[offset+1];
int green = data[offset+2];
int blue = data[offset+3];
NSLog(#"offset: %i colors: RGB A %i %i %i %i",offset,red,green,blue,alpha);
color = [UIColor colorWithRed:(red/255.0f) green:(green/255.0f) blue:(blue/255.0f) alpha:(alpha/255.0f)];
}
// When finished, release the context
CGContextRelease(cgctx);
// Free image data memory for the context
if (data) { free(data); }
return color;
}
- (CGContextRef) createARGBBitmapContextFromImage:(CGImageRef) inImage {
CGContextRef context = NULL;
CGColorSpaceRef colorSpace;
void * bitmapData;
int bitmapByteCount;
int bitmapBytesPerRow;
// Get image width, height. We'll use the entire image.
size_t pixelsWide = CGImageGetWidth(inImage);
size_t pixelsHigh = CGImageGetHeight(inImage);
// Declare the number of bytes per row. Each pixel in the bitmap in this
// example is represented by 4 bytes; 8 bits each of red, green, blue, and
// alpha.
bitmapBytesPerRow = (pixelsWide * 4);
bitmapByteCount = (bitmapBytesPerRow * pixelsHigh);
// Use the generic RGB color space.
colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
if (colorSpace == NULL)
{
fprintf(stderr, "Error allocating color space\n");
return NULL;
}
// Allocate memory for image data. This is the destination in memory
// where any drawing to the bitmap context will be rendered.
bitmapData = malloc( bitmapByteCount );
if (bitmapData == NULL)
{
fprintf (stderr, "Memory not allocated!");
CGColorSpaceRelease( colorSpace );
return NULL;
}
// Create the bitmap context. We want pre-multiplied ARGB, 8-bits
// per component. Regardless of what the source image format is
// (CMYK, Grayscale, and so on) it will be converted over to the format
// specified here by CGBitmapContextCreate.
context = CGBitmapContextCreate (bitmapData,
pixelsWide,
pixelsHigh,
8, // bits per component
bitmapBytesPerRow,
colorSpace,
kCGImageAlphaPremultipliedFirst);
if (context == NULL)
{
free (bitmapData);
fprintf (stderr, "Context not created!");
}
// Make sure and release colorspace before returning
CGColorSpaceRelease( colorSpace );
return context;
}`
to get the color at the bottom of the image to make it blend in my view controller which uses the color for its background, and has a shadow to make it blended.
Question: So, as it says: How do I get the least and most used color from an image?
The method below takes an image and analyses it for its main colours, in the following steps:
1.) scale down the image and determine the main pixel colours.
2.) add some colour flexibility to allow for the loss during scaling
3.) distinguish colours, removing similar ones
4.) return the colours as an ordered array or with their percentages
You could adapt it to return a specific number of colours, e.g. top 10 colours in image if you needed a guaranteed number of colours returned, or just use the "detail" variable if you don't.
Larger images will take a long time to analyse at high detail.
No doubt the method could be cleaned up a bit but could be a good starting point.
Use like this:
NSDictionary * mainColours = [s mainColoursInImage:image detail:1];
-(NSDictionary*)mainColoursInImage:(UIImage *)image detail:(int)detail {
//1. determine detail vars (0==low,1==default,2==high)
//default detail
float dimension = 10;
float flexibility = 2;
float range = 60;
//low detail
if (detail==0){
dimension = 4;
flexibility = 1;
range = 100;
//high detail (patience!)
} else if (detail==2){
dimension = 100;
flexibility = 10;
range = 20;
}
//2. determine the colours in the image
NSMutableArray * colours = [NSMutableArray new];
CGImageRef imageRef = [image CGImage];
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
unsigned char *rawData = (unsigned char*) calloc(dimension * dimension * 4, sizeof(unsigned char));
NSUInteger bytesPerPixel = 4;
NSUInteger bytesPerRow = bytesPerPixel * dimension;
NSUInteger bitsPerComponent = 8;
CGContextRef context = CGBitmapContextCreate(rawData, dimension, dimension, bitsPerComponent, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
CGColorSpaceRelease(colorSpace);
CGContextDrawImage(context, CGRectMake(0, 0, dimension, dimension), imageRef);
CGContextRelease(context);
float x = 0;
float y = 0;
for (int n = 0; n<(dimension*dimension); n++){
int index = (bytesPerRow * y) + x * bytesPerPixel;
int red = rawData[index];
int green = rawData[index + 1];
int blue = rawData[index + 2];
int alpha = rawData[index + 3];
NSArray * a = [NSArray arrayWithObjects:[NSString stringWithFormat:#"%i",red],[NSString stringWithFormat:#"%i",green],[NSString stringWithFormat:#"%i",blue],[NSString stringWithFormat:#"%i",alpha], nil];
[colours addObject:a];
y++;
if (y==dimension){
y=0;
x++;
}
}
free(rawData);
//3. add some colour flexibility (adds more colours either side of the colours in the image)
NSArray * copyColours = [NSArray arrayWithArray:colours];
NSMutableArray * flexibleColours = [NSMutableArray new];
float flexFactor = flexibility * 2 + 1;
float factor = flexFactor * flexFactor * 3; //(r,g,b) == *3
for (int n = 0; n<(dimension * dimension); n++){
NSArray * pixelColours = copyColours[n];
NSMutableArray * reds = [NSMutableArray new];
NSMutableArray * greens = [NSMutableArray new];
NSMutableArray * blues = [NSMutableArray new];
for (int p = 0; p<3; p++){
NSString * rgbStr = pixelColours[p];
int rgb = [rgbStr intValue];
for (int f = -flexibility; f<flexibility+1; f++){
int newRGB = rgb+f;
if (newRGB<0){
newRGB = 0;
}
if (p==0){
[reds addObject:[NSString stringWithFormat:#"%i",newRGB]];
} else if (p==1){
[greens addObject:[NSString stringWithFormat:#"%i",newRGB]];
} else if (p==2){
[blues addObject:[NSString stringWithFormat:#"%i",newRGB]];
}
}
}
int r = 0;
int g = 0;
int b = 0;
for (int k = 0; k<factor; k++){
int red = [reds[r] intValue];
int green = [greens[g] intValue];
int blue = [blues[b] intValue];
NSString * rgbString = [NSString stringWithFormat:#"%i,%i,%i",red,green,blue];
[flexibleColours addObject:rgbString];
b++;
if (b==flexFactor){ b=0; g++; }
if (g==flexFactor){ g=0; r++; }
}
}
//4. distinguish the colours
//orders the flexible colours by their occurrence
//then keeps them if they are sufficiently disimilar
NSMutableDictionary * colourCounter = [NSMutableDictionary new];
//count the occurences in the array
NSCountedSet *countedSet = [[NSCountedSet alloc] initWithArray:flexibleColours];
for (NSString *item in countedSet) {
NSUInteger count = [countedSet countForObject:item];
[colourCounter setValue:[NSNumber numberWithInteger:count] forKey:item];
}
//sort keys highest occurrence to lowest
NSArray *orderedKeys = [colourCounter keysSortedByValueUsingComparator:^NSComparisonResult(id obj1, id obj2){
return [obj2 compare:obj1];
}];
//checks if the colour is similar to another one already included
NSMutableArray * ranges = [NSMutableArray new];
for (NSString * key in orderedKeys){
NSArray * rgb = [key componentsSeparatedByString:#","];
int r = [rgb[0] intValue];
int g = [rgb[1] intValue];
int b = [rgb[2] intValue];
bool exclude = false;
for (NSString * ranged_key in ranges){
NSArray * ranged_rgb = [ranged_key componentsSeparatedByString:#","];
int ranged_r = [ranged_rgb[0] intValue];
int ranged_g = [ranged_rgb[1] intValue];
int ranged_b = [ranged_rgb[2] intValue];
if (r>= ranged_r-range && r<= ranged_r+range){
if (g>= ranged_g-range && g<= ranged_g+range){
if (b>= ranged_b-range && b<= ranged_b+range){
exclude = true;
}
}
}
}
if (!exclude){ [ranges addObject:key]; }
}
//return ranges array here if you just want the ordered colours high to low
NSMutableArray * colourArray = [NSMutableArray new];
for (NSString * key in ranges){
NSArray * rgb = [key componentsSeparatedByString:#","];
float r = [rgb[0] floatValue];
float g = [rgb[1] floatValue];
float b = [rgb[2] floatValue];
UIColor * colour = [UIColor colorWithRed:(r/255.0f) green:(g/255.0f) blue:(b/255.0f) alpha:1.0f];
[colourArray addObject:colour];
}
//if you just want an array of images of most common to least, return here
//return [NSDictionary dictionaryWithObject:colourArray forKey:#"colours"];
//if you want percentages to colours continue below
NSMutableDictionary * temp = [NSMutableDictionary new];
float totalCount = 0.0f;
for (NSString * rangeKey in ranges){
NSNumber * count = colourCounter[rangeKey];
totalCount += [count intValue];
temp[rangeKey]=count;
}
//set percentages
NSMutableDictionary * colourDictionary = [NSMutableDictionary new];
for (NSString * key in temp){
float count = [temp[key] floatValue];
float percentage = count/totalCount;
NSArray * rgb = [key componentsSeparatedByString:#","];
float r = [rgb[0] floatValue];
float g = [rgb[1] floatValue];
float b = [rgb[2] floatValue];
UIColor * colour = [UIColor colorWithRed:(r/255.0f) green:(g/255.0f) blue:(b/255.0f) alpha:1.0f];
colourDictionary[colour]=[NSNumber numberWithFloat:percentage];
}
return colourDictionary;
}
Not sure about finding most color or least color, but here is a method to find out the average color.
- (UIColor *)averageColor {
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
unsigned char rgba[4];
CGContextRef context = CGBitmapContextCreate(rgba, 1, 1, 8, 4, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
CGContextDrawImage(context, CGRectMake(0, 0, 1, 1), self.CGImage);
CGColorSpaceRelease(colorSpace);
CGContextRelease(context);
if(rgba[3] > 0) {
CGFloat alpha = ((CGFloat)rgba[3])/255.0;
CGFloat multiplier = alpha/255.0;
return [UIColor colorWithRed:((CGFloat)rgba[0])*multiplier
green:((CGFloat)rgba[1])*multiplier
blue:((CGFloat)rgba[2])*multiplier
alpha:alpha];
}
else {
return [UIColor colorWithRed:((CGFloat)rgba[0])/255.0
green:((CGFloat)rgba[1])/255.0
blue:((CGFloat)rgba[2])/255.0
alpha:((CGFloat)rgba[3])/255.0];
}
}
You can probably follow a similar approach to find out the most used color.
Also check this answer about counting red color pixels in an image.
Thanks a lot for your code, #JohnnyRockex. It was really helpful in getting me started towards my goal (finding accent colors depending on the most predominant color in an image).
After going through it, I found the code could be simplified and made easier to read, so I'd like to give back to the community my own version; the -colors selector is in a UIImage extension.
- (NSArray *)colors {
// Original code by Johnny Rockex http://stackoverflow.com/a/29266983/825644
// Higher the dimension, the more pixels are checked against.
const float pixelDimension = 10;
// Higher the range, more similar colors are removed.
const float filterRange = 60;
unsigned char *rawData = (unsigned char*) calloc(pixelDimension * pixelDimension * kBytesPerPixel, sizeof(unsigned char));
NSUInteger bytesPerRow = kBytesPerPixel * pixelDimension;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(rawData, pixelDimension, pixelDimension, kBitsInAByte, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
CGColorSpaceRelease(colorSpace);
CGContextDrawImage(context, CGRectMake(0, 0, pixelDimension, pixelDimension), [self CGImage]);
CGContextRelease(context);
NSMutableArray * colors = [[NSMutableArray alloc] init];
float x = 0;
float y = 0;
const int pixelMatrixSize = pixelDimension * pixelDimension;
for (int i = 0; i < pixelMatrixSize; i++){
int index = (bytesPerRow * y) + x * kBytesPerPixel;
int red = rawData[index];
int green = rawData[index + 1];
int blue = rawData[index + 2];
int alpha = rawData[index + 3];
UIColor * color = [UIColor colorWithRed:(red / 255.0f) green:(green / 255.0f) blue:(blue / 255.0f) alpha:alpha];
[colors addObject:color];
y++;
if (y == pixelDimension){
y = 0;
x++;
}
}
free(rawData);
NSMutableDictionary * colorCounter = [[NSMutableDictionary alloc] init];
NSCountedSet *countedSet = [[NSCountedSet alloc] initWithArray:colors];
for (NSString *item in countedSet) {
NSUInteger count = [countedSet countForObject:item];
[colorCounter setValue:[NSNumber numberWithInteger:count] forKey:item];
}
NSArray *orderedColors = [colorCounter keysSortedByValueUsingComparator:^NSComparisonResult(id obj1, id obj2){
return [obj2 compare:obj1];
}];
NSMutableArray *filteredColors = [NSMutableArray new];
for (UIColor *color in orderedColors){
bool filtered = false;
for (UIColor *rangedColor in filteredColors){
if (abs(color.redRGBComponent - rangedColor.redRGBComponent) <= filterRange &&
abs(color.greenRGBComponent - rangedColor.greenRGBComponent) <= filterRange &&
abs(color.blueRGBComponent - rangedColor.blueRGBComponent) <= filterRange) {
filtered = true;
break;
}
}
if (!filtered) {
[filteredColors addObject:color];
}
}
return [filteredColors copy];
The code for UIColor's extension adding the -rgbComponent function can be found underneath, but I wrote it in Swift (trying to write all new classes in Swift, but this wasn't the case for the -colors selector):
extension UIColor {
open func redRGBComponent() -> UInt8 {
let colorComponents = cgColor.components!
return UInt8(colorComponents[0] * 255)
}
open func greenRGBComponent() -> UInt8 {
let colorComponents = cgColor.components!
return UInt8(colorComponents[1] * 255)
}
open func blueRGBComponent() -> UInt8 {
let colorComponents = cgColor.components!
return UInt8(colorComponents[2] * 255)
}
}
Enjoy!
I wrote this tool to do that.
https://github.com/623637646/UIImageColorRatio
// replace the UIImage() to yourself's UIImage.
let theMostUsedColor = UIImage().calculateColorRatio(deviation: 0)?.colorRatioArray.first?.color
let theLeastUsedColor = UIImage().calculateColorRatio(deviation: 0)?.colorRatioArray.last?.color
I have a problem with counting my module. I am doing the following.
- (void)makeGrid:withData:(NSDictionary * )data
{
NSLog(#"aantal is: %d",[data count]);
int xStart = 0;
int yStart = 0;
int xCurrent = xStart;
int yCurrent = yStart;
int xStepSize = 165;
int yStepSize = 251;
int xCnt = 3 ;
int yCnt = [data count] % 3;
int cellCounter = 0;
UIView * gridContainerView = [[UIView alloc] init];
[keeperView addSubview:gridContainerView];
for (int y = 0; y < yCnt; y++) {
for (int x = 0; x < xCnt; x++) {
printf("xCurrent %d yCurrent %d \n", xCurrent, yCurrent);
NSString *url1 = #"player_imgUrl";
NSString *url2 = [NSString stringWithFormat:#"%i", x];
NSString *url3 = [url1 stringByAppendingString:url2];
NSData* imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[data objectForKey:url3]]];
UIImage* myImage = [[UIImage alloc] initWithData:imageData];
UIImageView * myView = [[UIImageView alloc] initWithImage:myImage];
CGRect rect = myView.frame;
rect.origin.x = xCurrent;
rect.origin.y = yCurrent;
myView.frame = rect;
myView.tag = cellCounter;
[gridContainerView addSubview:myView];
//just label stuff
UILabel * myLabel = [[UILabel alloc] init];
[gridContainerView addSubview:myLabel];
//--------------------------------
xCurrent += xStepSize;
cellCounter++;
}
xCurrent = xStart;
yCurrent += yStepSize;
}
CGRect repositionRect = gridContainerView.frame;
repositionRect.origin.y = 100;
gridContainerView.frame = repositionRect;
}
My NSLog says that in my data object are 16 values. And when I run it, it only shows 3 imageviews. Does anybody know what I am doing wrong?
Please help,
Kind regads.
After reading your code, the number of imageviews should be (xCnt * yCnt).
Your problem is here:
int yCnt = [data count] % 3;
the yCnt is 1 when your data is 16, that's why your result is 3 imageviews only.
to overcome this issue, you should do the following:
yCnt = (data.count / xCnt) + 1;
for (int y = 0 ; y < yCnt; y++)
{
for (int x = 0; x < xCnt; x++)
{
if ((y == (yCnt - 1)) && (x > (data.count % xCnt)))
{
break;
}
else {
// Your Grid code here
}
}
}
Hope This helps.
int yCnt = [data count] % 3;
gives 1 when [data count] == 16;
I'm looking for how to draw the sound amplitude.
I found http://supermegaultragroovy.com/2009/10/06/drawing-waveforms/ but i have some problems. How get a list of floating-point values representing the audio?
Thank all.
I found this example here: Drawing waveform with AVAssetReader , changed it and developed a new class based on.
This class returns UIImageView.
//.h file
#import <UIKit/UIKit.h>
#interface WaveformImageVew : UIImageView{
}
-(id)initWithUrl:(NSURL*)url;
- (NSData *) renderPNGAudioPictogramLogForAssett:(AVURLAsset *)songAsset;
#end
//.m file
#import "WaveformImageVew.h"
#define absX(x) (x<0?0-x:x)
#define minMaxX(x,mn,mx) (x<=mn?mn:(x>=mx?mx:x))
#define noiseFloor (-50.0)
#define decibel(amplitude) (20.0 * log10(absX(amplitude)/32767.0))
#define imgExt #"png"
#define imageToData(x) UIImagePNGRepresentation(x)
#implementation WaveformImageVew
-(id)initWithUrl:(NSURL*)url{
if(self = [super init]){
AVURLAsset * urlA = [AVURLAsset URLAssetWithURL:url options:nil];
[self setImage:[UIImage imageWithData:[self renderPNGAudioPictogramLogForAssett:urlA]]];
}
return self;
}
-(UIImage *) audioImageLogGraph:(Float32 *) samples
normalizeMax:(Float32) normalizeMax
sampleCount:(NSInteger) sampleCount
channelCount:(NSInteger) channelCount
imageHeight:(float) imageHeight {
CGSize imageSize = CGSizeMake(sampleCount, imageHeight);
UIGraphicsBeginImageContext(imageSize);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [UIColor blackColor].CGColor);
CGContextSetAlpha(context,1.0);
CGRect rect;
rect.size = imageSize;
rect.origin.x = 0;
rect.origin.y = 0;
CGColorRef leftcolor = [[UIColor whiteColor] CGColor];
CGColorRef rightcolor = [[UIColor redColor] CGColor];
CGContextFillRect(context, rect);
CGContextSetLineWidth(context, 1.0);
float halfGraphHeight = (imageHeight / 2) / (float) channelCount ;
float centerLeft = halfGraphHeight;
float centerRight = (halfGraphHeight*3) ;
float sampleAdjustmentFactor = (imageHeight/ (float) channelCount) / (normalizeMax - noiseFloor) / 2;
for (NSInteger intSample = 0 ; intSample < sampleCount ; intSample ++ ) {
Float32 left = *samples++;
float pixels = (left - noiseFloor) * sampleAdjustmentFactor;
CGContextMoveToPoint(context, intSample, centerLeft-pixels);
CGContextAddLineToPoint(context, intSample, centerLeft+pixels);
CGContextSetStrokeColorWithColor(context, leftcolor);
CGContextStrokePath(context);
if (channelCount==2) {
Float32 right = *samples++;
float pixels = (right - noiseFloor) * sampleAdjustmentFactor;
CGContextMoveToPoint(context, intSample, centerRight - pixels);
CGContextAddLineToPoint(context, intSample, centerRight + pixels);
CGContextSetStrokeColorWithColor(context, rightcolor);
CGContextStrokePath(context);
}
}
// Create new image
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
// Tidy up
UIGraphicsEndImageContext();
return newImage;
}
- (NSData *) renderPNGAudioPictogramLogForAssett:(AVURLAsset *)songAsset {
NSError * error = nil;
AVAssetReader * reader = [[AVAssetReader alloc] initWithAsset:songAsset error:&error];
AVAssetTrack * songTrack = [songAsset.tracks objectAtIndex:0];
NSDictionary* outputSettingsDict = [[NSDictionary alloc] initWithObjectsAndKeys:
[NSNumber numberWithInt:kAudioFormatLinearPCM],AVFormatIDKey,
// [NSNumber numberWithInt:44100.0],AVSampleRateKey, /*Not Supported*/
// [NSNumber numberWithInt: 2],AVNumberOfChannelsKey, /*Not Supported*/
[NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,
[NSNumber numberWithBool:NO],AVLinearPCMIsBigEndianKey,
[NSNumber numberWithBool:NO],AVLinearPCMIsFloatKey,
[NSNumber numberWithBool:NO],AVLinearPCMIsNonInterleaved,
nil];
AVAssetReaderTrackOutput* output = [[AVAssetReaderTrackOutput alloc] initWithTrack:songTrack outputSettings:outputSettingsDict];
[reader addOutput:output];
[output release];
UInt32 sampleRate,channelCount;
NSArray* formatDesc = songTrack.formatDescriptions;
for(unsigned int i = 0; i < [formatDesc count]; ++i) {
CMAudioFormatDescriptionRef item = (CMAudioFormatDescriptionRef)[formatDesc objectAtIndex:i];
const AudioStreamBasicDescription* fmtDesc = CMAudioFormatDescriptionGetStreamBasicDescription (item);
if(fmtDesc ) {
sampleRate = fmtDesc->mSampleRate;
channelCount = fmtDesc->mChannelsPerFrame;
// NSLog(#"channels:%u, bytes/packet: %u, sampleRate %f",fmtDesc->mChannelsPerFrame, fmtDesc->mBytesPerPacket,fmtDesc->mSampleRate);
}
}
UInt32 bytesPerSample = 2 * channelCount;
Float32 normalizeMax = noiseFloor;
NSLog(#"normalizeMax = %f",normalizeMax);
NSMutableData * fullSongData = [[NSMutableData alloc] init];
[reader startReading];
UInt64 totalBytes = 0;
Float64 totalLeft = 0;
Float64 totalRight = 0;
Float32 sampleTally = 0;
NSInteger samplesPerPixel = sampleRate / 50;
while (reader.status == AVAssetReaderStatusReading){
AVAssetReaderTrackOutput * trackOutput = (AVAssetReaderTrackOutput *)[reader.outputs objectAtIndex:0];
CMSampleBufferRef sampleBufferRef = [trackOutput copyNextSampleBuffer];
if (sampleBufferRef){
CMBlockBufferRef blockBufferRef = CMSampleBufferGetDataBuffer(sampleBufferRef);
size_t length = CMBlockBufferGetDataLength(blockBufferRef);
totalBytes += length;
NSAutoreleasePool *wader = [[NSAutoreleasePool alloc] init];
NSMutableData * data = [NSMutableData dataWithLength:length];
CMBlockBufferCopyDataBytes(blockBufferRef, 0, length, data.mutableBytes);
SInt16 * samples = (SInt16 *) data.mutableBytes;
int sampleCount = length / bytesPerSample;
for (int i = 0; i < sampleCount ; i ++) {
Float32 left = (Float32) *samples++;
left = decibel(left);
left = minMaxX(left,noiseFloor,0);
totalLeft += left;
Float32 right;
if (channelCount==2) {
right = (Float32) *samples++;
right = decibel(right);
right = minMaxX(right,noiseFloor,0);
totalRight += right;
}
sampleTally++;
if (sampleTally > samplesPerPixel) {
left = totalLeft / sampleTally;
if (left > normalizeMax) {
normalizeMax = left;
}
// NSLog(#"left average = %f, normalizeMax = %f",left,normalizeMax);
[fullSongData appendBytes:&left length:sizeof(left)];
if (channelCount==2) {
right = totalRight / sampleTally;
if (right > normalizeMax) {
normalizeMax = right;
}
[fullSongData appendBytes:&right length:sizeof(right)];
}
totalLeft = 0;
totalRight = 0;
sampleTally = 0;
}
}
[wader drain];
CMSampleBufferInvalidate(sampleBufferRef);
CFRelease(sampleBufferRef);
}
}
NSData * finalData = nil;
if (reader.status == AVAssetReaderStatusFailed || reader.status == AVAssetReaderStatusUnknown){
// Something went wrong. Handle it.
}
if (reader.status == AVAssetReaderStatusCompleted){
// You're done. It worked.
NSLog(#"rendering output graphics using normalizeMax %f",normalizeMax);
UIImage *test = [self audioImageLogGraph:(Float32 *) fullSongData.bytes
normalizeMax:normalizeMax
sampleCount:fullSongData.length / (sizeof(Float32) * 2)
channelCount:2
imageHeight:100];
finalData = imageToData(test);
}
[fullSongData release];
[reader release];
return finalData;
}
#end
Been reading your question and created a control for this. Looks like this:
Code here:
https://github.com/fulldecent/FDWaveformView
Discussion here:
https://www.cocoacontrols.com/controls/fdwaveformview
UPDATE 2015-01-29: This project is going strong and making consistent releases. Thanks for SO for all the exposure!
I can give you reference of the one that I have implemented in my application. It was apple's example. Here is the example of AurioTouch which analyzes 3 types of sound audio. Apple has still not provided to analyse directly the audio waves... so this example also uses the Mic to analyse the sound...
Amongst 3 I have used only Oscilloscope for analysing the amplitude effect. I have to change that code drastically to match my requirement, so best of luck if you are going to use...
You can also see one more example using such amplitude : SpeakHere of Apple
This is the code I have used to convert my audio data (audio file ) into floating point representation and saved into an array.
-(void) PrintFloatDataFromAudioFile {
NSString * name = #"Filename"; //YOUR FILE NAME
NSString * source = [[NSBundle mainBundle] pathForResource:name ofType:#"m4a"]; // SPECIFY YOUR FILE FORMAT
const char *cString = [source cStringUsingEncoding:NSASCIIStringEncoding];
CFStringRef str = CFStringCreateWithCString(
NULL,
cString,
kCFStringEncodingMacRoman
);
CFURLRef inputFileURL = CFURLCreateWithFileSystemPath(
kCFAllocatorDefault,
str,
kCFURLPOSIXPathStyle,
false
);
ExtAudioFileRef fileRef;
ExtAudioFileOpenURL(inputFileURL, &fileRef);
AudioStreamBasicDescription audioFormat;
audioFormat.mSampleRate = 44100; // GIVE YOUR SAMPLING RATE
audioFormat.mFormatID = kAudioFormatLinearPCM;
audioFormat.mFormatFlags = kLinearPCMFormatFlagIsFloat;
audioFormat.mBitsPerChannel = sizeof(Float32) * 8;
audioFormat.mChannelsPerFrame = 1; // Mono
audioFormat.mBytesPerFrame = audioFormat.mChannelsPerFrame * sizeof(Float32); // == sizeof(Float32)
audioFormat.mFramesPerPacket = 1;
audioFormat.mBytesPerPacket = audioFormat.mFramesPerPacket * audioFormat.mBytesPerFrame; // = sizeof(Float32)
// 3) Apply audio format to the Extended Audio File
ExtAudioFileSetProperty(
fileRef,
kExtAudioFileProperty_ClientDataFormat,
sizeof (AudioStreamBasicDescription), //= audioFormat
&audioFormat);
int numSamples = 1024; //How many samples to read in at a time
UInt32 sizePerPacket = audioFormat.mBytesPerPacket; // = sizeof(Float32) = 32bytes
UInt32 packetsPerBuffer = numSamples;
UInt32 outputBufferSize = packetsPerBuffer * sizePerPacket;
// So the lvalue of outputBuffer is the memory location where we have reserved space
UInt8 *outputBuffer = (UInt8 *)malloc(sizeof(UInt8 *) * outputBufferSize);
AudioBufferList convertedData ;//= malloc(sizeof(convertedData));
convertedData.mNumberBuffers = 1; // Set this to 1 for mono
convertedData.mBuffers[0].mNumberChannels = audioFormat.mChannelsPerFrame; //also = 1
convertedData.mBuffers[0].mDataByteSize = outputBufferSize;
convertedData.mBuffers[0].mData = outputBuffer; //
UInt32 frameCount = numSamples;
float *samplesAsCArray;
int j =0;
double floatDataArray[882000] ; // SPECIFY YOUR DATA LIMIT MINE WAS 882000 , SHOULD BE EQUAL TO OR MORE THAN DATA LIMIT
while (frameCount > 0) {
ExtAudioFileRead(
fileRef,
&frameCount,
&convertedData
);
if (frameCount > 0) {
AudioBuffer audioBuffer = convertedData.mBuffers[0];
samplesAsCArray = (float *)audioBuffer.mData; // CAST YOUR mData INTO FLOAT
for (int i =0; i<1024 /*numSamples */; i++) { //YOU CAN PUT numSamples INTEAD OF 1024
floatDataArray[j] = (double)samplesAsCArray[i] ; //PUT YOUR DATA INTO FLOAT ARRAY
printf("\n%f",floatDataArray[j]); //PRINT YOUR ARRAY'S DATA IN FLOAT FORM RANGING -1 TO +1
j++;
}
}
}}
this is my answer, thx all geek
obj-c
here is code:
-(void) listenerData:(NSNotification *) notify
{
int resnum=112222;
unsigned int bitsum=0;
for(int i=0;i<4;i++)
{
bitsum+=(resnum>>(i*8))&0xff;
}
bitsum=bitsum&0xff;
NSString * check=[NSString stringWithFormat:#"%x %x",resnum,bitsum];
check=nil;
self.drawData=notify.object;``
[self setNeedsDisplay];
}
-(void)drawRect:(CGRect)rect
{
NSArray *data=self.drawData;
NSData *tdata=[data objectAtIndex:0];
double *srcdata=(double*)tdata.bytes;
int datacount=tdata.length/sizeof(double);
tdata=[data objectAtIndex:1];
double *coveddata=(double*)tdata.bytes;
CGContextRef context=UIGraphicsGetCurrentContext();
CGRect bounds=self.bounds;
CGContextClearRect(context, bounds);
CGFloat midpos=bounds.size.height/2;
CGContextBeginPath(context);
const double scale=1.0/100;
CGFloat step=bounds.size.width/(datacount-1);
CGContextMoveToPoint(context, 0, midpos);
CGFloat xpos=0;
for(int i=0;i<datacount;i++)
{
CGContextAddLineToPoint(context, xpos, midpos-srcdata[i]*scale);
xpos+=step;
}
CGContextAddLineToPoint(context, bounds.size.width, midpos);
CGContextClosePath(context);
CGContextSetRGBFillColor(context, 1.0, 0.0, 0.0, 1.0);
CGContextFillPath(context);
CGContextBeginPath(context);
const double scale2=1.0/100;
CGContextMoveToPoint(context, 0, midpos);
xpos=0;
for(int i=0;i<datacount;i++)
{
CGContextAddLineToPoint(context, xpos, midpos+coveddata[i]*scale2);
xpos+=step;
}
CGContextAddLineToPoint(context, bounds.size.width, midpos);
CGContextClosePath(context);
CGContextSetRGBFillColor(context, 1.0, 0.0, 1.0, 1.0);
CGContextFillPath(context);
}