I have 2 NSViews arranged side by side that have backgrounds made from tiled images.
When I add constraints to the views so that they resize with the main window the tiled background image no longer displays and the background is just black.
What am I missing here?
#import "imageWellGraphics.h"
#implementation imageWellGraphics
- (id)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code here.
}
return self;
}
- (void)drawRect:(NSRect)dirtyRect
{
CGContextRef context = [[NSGraphicsContext currentContext] graphicsPort];
CGAffineTransform affineTransform = CGContextGetCTM(context);
NSImage* image = [NSImage imageNamed: #"tile.png"];
NSColor* imagePattern = [NSColor colorWithPatternImage: image];
NSRect frame = NSInsetRect(self.bounds, 1, 1);
NSBezierPath* rectanglePath = [NSBezierPath bezierPathWithRect:NSMakeRect(NSMinX(frame), NSMinY(frame), NSWidth(frame), NSHeight(frame))];
[NSGraphicsContext saveGraphicsState];
CGContextSetPatternPhase(context, NSMakeSize(affineTransform.tx, affineTransform.ty));
[imagePattern setFill];
[rectanglePath fill];
[NSGraphicsContext restoreGraphicsState];
}
#end
Include this line inside drawrect method and check:-
[super drawRect:dirtyRect];
Well, it turns out the problem was me not properly understanding/using Images.xcassets for my background image.
Related
I am trying to draw animated gif on my screen in mac OSX app .
I used this code to insert the gif: I can see the Gif as 1 picture it doesn't animates
only static picture :( what should I add to make it animated ?
#import <Cocoa/Cocoa.h>
#import <Quartz/Quartz.h>//for drawing circle
#import "sharedPrefferences.h"
#interface GenericFanSubView : NSView
{
NSColor * _backgroundColor;
NSImageView* imageView;
}
- (void)setBackgroundColor :(NSColor*)color;
- (void)insertGif1;
- (void)insertGif2;
- (void)insertGif3;
#end
#import "GenericFanSubView.h"
#define PI 3.14285714285714
#implementation GenericFanSubView
- (id)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code here.
imageView = [[NSImageView alloc]initWithFrame:CGRectMake(0, 0,self.frame.size.width,self.frame.size.height)];
[imageView setAnimates: YES];
}
return self;
}
- (void)drawRect:(NSRect)dirtyRect
{
[super drawRect:dirtyRect];
// Drawing code here.
[self drawCircleInRect];
_backgroundColor = [NSColor whiteColor];
[self insertGif1];
}
-(void)drawCircleInRect
{
//draw colored circle here
CGContextRef context = [[NSGraphicsContext // 1
currentContext] graphicsPort];
// ********** Your drawing code here ********** // 2
CGContextSetFillColorWithColor(context,[self NSColorToCGColor:(_backgroundColor)]);
float radius1 = self.frame.size.height/2;
float startAngle = 0;
float endAngle = endAngle = PI*2;
CGPoint position = CGPointMake(self.frame.size.height/2,self.frame.size.height/2);//center of the view
CGContextBeginPath(context);
CGContextAddArc(context, position.x, position.y, radius1, startAngle, endAngle, 1);
CGContextDrawPath(context, kCGPathFill); // Or kCGPathFill
}
- (void)setBackgroundColor :(NSColor*)color
{
_backgroundColor = color;
[self setNeedsDisplay:YES];
}
- (CGColorRef)NSColorToCGColor:(NSColor *)color
{
NSInteger numberOfComponents = [color numberOfComponents];
CGFloat components[numberOfComponents];
CGColorSpaceRef colorSpace = [[color colorSpace] CGColorSpace];
[color getComponents:(CGFloat *)&components];
CGColorRef cgColor = CGColorCreate(colorSpace, components);
return cgColor;
}
//curentlly calling only this 1
- (void)insertGif1
{
[imageView removeFromSuperview];
[imageView setImageScaling:NSImageScaleNone];
[imageView setAnimates: YES];
imageView.image = [NSImage imageNamed:#"FanBlades11.gif"];
[self addSubview:imageView];
}
#end
Edit: I discovered the source of the problem:
I was adding my class (that represents gif inside the circle) on top of RMBlurredView
and the animations doesn't work when I adding it as subview ,However it works on all the other views I added.
Any ideas what could be the reason inside the RMBlurredView to stop my NSImageView from animating ?
Edit:
I think [self setWantsLayer:YES]; is the reason I am not getting animations
how can I still get the animation with this feature enabled?
Edit:
Here is a simple sample with my problem
http://snk.to/f-cdk3wmfn
my gif:This is my gif it is invisible on white background color
"You must disable the autoscaling feature of the NSImageView for the
animation playback to function. After you've done that, no extra
programming required. It works like a charm!"
--http://www.cocoabuilder.com/archive/cocoa/108530-nsimageview-and-animated-gifs.html
imageView.imageScaling = NSImageScaleNone;
imageView.animates = YES;
needed for layer backed views:
if the image view is in a layer backed view or is layer backed itself:
imageView.canDrawSubviewsIntoLayer = YES;
working example using the question's own gif:
NSImageView *view = [[NSImageView alloc] initWithFrame:CGRectMake(10, 10, 50, 50)];
view.imageScaling = NSImageScaleNone;
view.animates = YES;
view.image = [NSImage imageNamed:#"FanBlades2_42x42.gif"];
view.canDrawSubviewsIntoLayer = YES;
NSView *layerview = [[NSView alloc] initWithFrame:CGRectMake(0, 0, 60, 60)];
layerview.wantsLayer = YES;
[layerview addSubview:view];
[self.window.contentView addSubview:layerview];
I'm trying to draw some things on the background of my windows. Therefore I subclassed the NSView of the window and added some drawing code like this:
- (void)drawRect:(NSRect)dirtyRect {
float color = 0.95;
[[NSColor colorWithDeviceRed:color green:color blue:color alpha:1.0] set];
NSRectFill(NSMakeRect(320, 0, 220, NSHeight(dirtyRect)-60));
}
This works great, but as soon as I open a NSComboBox or if I activate a checkbox, the background of these elements erases my just drawn rect.
I don't understand this, because checking for example the checkbox causes, that drawRect is called (I added a NSLog). Only resizing the window draws my rect again.
EDIT:
here is a screenshot of the problem:
I sometimes face the same problem. I think the following is what I use.
/// .h
#interface BackgroundView1 : NSView {
NSImage *myImage;
}
// .m
- (void)awakeFromNib {
[self setupBackgroundImage];
}
- (void)setupBackgroundImage {
NSColor *c = [NSColor colorWithDeviceRed:0.0f/255.0f green:55.0f/255.0f blue:150.0f/255.0f alpha:1.0f];
if (myImage == nil)
myImage = [self createColorImage:NSMakeSize(1,1):c];
}
- (void)drawRect:(NSRect)rect {
[myImage drawInRect:NSMakeRect([self bounds].origin.x,[self bounds].origin.y,[self frame].size.width,[self frame].size.height)
fromRect:NSMakeRect(0,0,[myImage size].width, [myImage size].height)
operation:NSCompositeCopy
fraction:1.0];
}
// Start Functions //
- (NSImage *)createColorImage:(NSSize)size :(NSColor *)color {
NSImage *image = [[NSImage alloc] initWithSize:size];
NSBitmapImageRep *rep = [[NSBitmapImageRep alloc]
initWithBitmapDataPlanes:NULL
pixelsWide:size.width
pixelsHigh:size.height
bitsPerSample:8
samplesPerPixel:4
hasAlpha:YES
isPlanar:NO
colorSpaceName:NSCalibratedRGBColorSpace
bytesPerRow:0
bitsPerPixel:0];
[image addRepresentation:rep];
[image lockFocus]; // Lock focus of image, making it a destination for drawing
[color set];
NSRectFill(NSMakeRect(0,0,size.width,size.height));
[image unlockFocus];
return image;
}
// End Functions //
I want to draw image background in NSView and place some elements which also have transparent background on top of it.
I've overrided draw rect of NSView:
- (void)drawRect:(NSRect)rect
{
[NSGraphicsContext saveGraphicsState];
NSImage *image = [NSImage imageNamed:#"header_background.gif"];
[image drawInRect:CGRectMake(0, rect.size.height - 75, rect.size.width, 75) fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1.0];
[NSGraphicsContext restoreGraphicsState];
}
NSWindow init:
- (id)initWithContentRect:(NSRect)contentRect styleMask:(NSUInteger)aStyle backing:(NSBackingStoreType)bufferingType defer:(BOOL)flag
{
self = [super initWithContentRect:contentRect styleMask:aStyle backing:bufferingType defer:flag];
if (self) {
[self setOpaque:NO];
[self setHasShadow:YES];
[self setBackgroundColor:[NSColor clearColor]];
}
return self;
}
After that a've got such weird effect. Backgrounds of Sliders and buttons are also blinking sometimes
What am I doing wrong?
Well, first off, your “color” is ignored when drawing images, so that’s not doing anything. Second, the code I see here probably isn’t causing the problem, can you post the rest of the file?
Right now I’m suspecting maybe you have marked this view as being opaque, when it’s not, or that you have something else odd in your view hierarchy.
I'm trying to store NSView Current Context and draw it later to NSView again. I was wondering what is the fastest and most efficient way to do this?
You can draw your content to an NSImage and just redraw the image later, but you need to invalidate the cache when needed (this depends on what your view does).
Example:
#interface SOCacheView : NSView
#end
#implementation SOCacheView
{
NSImage *_cache;
}
- (void)drawRect:(NSRect)dirtyRect
{
[super drawRect:dirtyRect];
if (!_cache) [self prepareImage];
[_cache drawAtPoint:NSZeroPoint fromRect:self.bounds operation:NSCompositeSourceOver fraction:1.0];
}
- (void)prepareImage
{
_cache = [[NSImage alloc] initWithSize:self.bounds.size];
[_cache lockFocus];
// do the drawing here...
[[NSColor blueColor] setFill];
NSRectFill(NSMakeRect(0, 0, NSWidth(self.bounds)/2, NSHeight(self.bounds)));
[[NSColor redColor] setFill];
NSRectFill(NSMakeRect(NSWidth(self.bounds)/2, 0, NSWidth(self.bounds)/2, NSHeight(self.bounds)));
[_cache unlockFocus];
}
To invalidate the cached drawing, just set _cache to nil.
Here's a sample project for you to play with 😉
I have subclasses NSImageView and i want to draw a border around with rounded corners. It works but i need to clip off the image corners as well.
Please see my screenshot:
I have created this code to draw the border/corners.
- (void)drawRect:(NSRect)dirtyRect
{
[super drawRect:dirtyRect];
NSColor *strokeColor;
if(self.isSelected)
strokeColor = [NSColor colorFromHexRGB:#"f9eca2"];
else
strokeColor = [NSColor colorFromHexRGB:#"000000"];
[strokeColor set];
[[NSBezierPath bezierPathWithRoundedRect:NSInsetRect(dirtyRect, 1, 1) xRadius:5 yRadius:5] stroke];
}
What should i do to make the image clip ?
EDIT:
Well i fixed it, but i feel its an ugly way to do it. Anything smarter?
NEW CODE:
- (void)drawRect:(NSRect)dirtyRect
{
NSBezierPath *path = [NSBezierPath bezierPathWithRoundedRect:NSInsetRect(dirtyRect, 2, 2) xRadius:5 yRadius:5];
[path setLineWidth:4.0];
[path addClip];
[self.image drawAtPoint: NSZeroPoint
fromRect:dirtyRect
operation:NSCompositeSourceOver
fraction: 1.0];
[super drawRect:dirtyRect];
NSColor *strokeColor;
if(self.isSelected)
{
strokeColor = [NSColor colorFromHexRGB:#"f9eca2"];
}
else
strokeColor = [NSColor colorFromHexRGB:#"000000"];
[strokeColor set];
[NSBezierPath setDefaultLineWidth:4.0];
[[NSBezierPath bezierPathWithRoundedRect:NSInsetRect(dirtyRect, 2, 2) xRadius:5 yRadius:5] stroke];
}
Set the corner radius of your NSImageViews layer also to 5 px and set its maskToBounds property to YES.
updated answer for XCode 8.3 and Swift 3.1
import Cocoa
class SomeViewController: NSViewController {
#IBOutlet weak var artwork: NSImageView!
override func viewDidLoad() {
super.viewDidLoad()
artwork.wantsLayer = true // Use a layer as backing store for this view
artwork.canDrawSubviewsIntoLayer = true // Important, flatten all subviews into layer
artwork.layer?.cornerRadius = 4.0
artwork.layer?.masksToBounds = true // Mask layer
}
}