I'm doing a lot of things now when I'm learning to programing in Objective-C.
I want now to check, if two object have meet. If their positions are the same.
I have done this with this:
if(CGRectIntersectsRect(picture1.frame, picture2.frame))
But that is not the best solution, because my pictures are transparent (.png), but the picture inside is smaller and the shape of picture is not a square. So there are a lot of pixels around which I don't want to be part of this picture.
Is there a way to write like picture.frame-30 or something? Or someone have a better solution?
You can make "picture.frame - 30" object like this:
CGRect rect = picture2.frame;
CGRect innerPicture2Frame = CGRectMake(rect.origin.x+30, rect.origin.y+30, rect.size.width-60, rect.size.height-60);
Related
I've been looking for a solution for quite a while now, but I can't help finding one. The situation is as following: I created an SKSpriteNode with an image, by the method touchesBegan I want to interact with it, like if one touches the image, something should change. The problem is that the hitbox around this image is square-shaped and not adjusted to the shape of the image. Has anyone got any clue how I can solve this problem? I tried doing it by changing the physicsBody like this
CGFloat offsetX = node.frame.size.width * node.anchorPoint.x;
CGFloat offsetY = node.frame.size.height * node.anchorPoint.y;
CGMutablePathRef path = CGPathCreateMutable();
CGPathCloseSubpath(path);
node.physicsBody = [SKPhysicsBody bodyWithPolygonFromPath:path];
Seems like the touchesBegan method doesn't use the physicsBody shape but the actual shape, I tried my best explaining it, sorry if I confused you.
Thanks in advance!
Julian
In the Xcode level editor, under the physics definition of your SKSpriteNode, change the body type to alpha mask (see image). This makes the physics boundary conform to the actual shape of your sprite rather than the rectangular bounding box.
Sadly, this solution only applies if your sprites are managed in an .sks file since level editor seems to have logic that calculates your sprite's outline and turns it into a path used to initialize the physics body with a body type of 'alpha mask'. (Too bad there's currently no 'bodyType' property on SKPhysicsBody because it would be really convenient to be able to set this programmatically instead of only being able to do so in the .sks file... Apple?)
The way you're attempting to create and initialize an SKPhysicsBody with a CGpath is on the right track I think... But since it's currently an empty path (having no points or lines) I'm guessing it won't have any effect.
Is there any way you could approximate some points & lines to represent a rough outline path for your sprite? Then, you could use those points to create a CGPath and then use that to initialize an SKPhysicsBody.
If not, a short-term compromise could be to initialize your SKPhysicsBody using init(circleOfRadius:) and use a circle as the body type which could seem less clunky than a box. And you could maybe play around with the circle radius to get a feel for the most natural radius for your collisions.
This has already been asked at Add a magnifier in cocos2d games
But I didn't quite understand the answer. I am using the same tutorial Let's Spot It is using but I'm not sure where to put madhu's code. I also don't know what the runAction method looks like.
Thanks
Hmm... Cocos2d CCLens3D, makes the area that is set by the programmer to popup.. Please look at the example provided by cocos2d..
the codes:
id lens = [CCLens3D actionWithPosition:ccp(size.width/2,size.height/2) radius:240 grid:ccg(15,10) duration:0.0f];
[self runAction:lens];
self is the layer where your image should be..
ccp(size.width/2, size.height/2) should be changed to ccp(yourPosition.x, yourPosition.y), means the positions which you want the popUp to be at.. Radius is the size of the circle, duration is how long you want it to be, 0.0 meaning infinite.. grid just use the same values..
Im not sure how else I should approach it, but if I was to (in my mac application) have a grid of NSViews, which the user can change the colour of each, is it possible to then translate this, so now I have been given a colour for each pixel by the user, make this into an exportable image?
I honestly can't think of how else to do this. I don't want to go ahead an realise I have taken a rather foolish path.
The idea is I will have a grid of squares which the user can paint, a colour in each square, a square representing a pixel in the final image. So they paint with like a paint bucket filling each one, then export it into an actual image file.
Any help much appreciated, thanks.
A grid of NSViews sounds really heavy for what you're doing. Why not write one single custom view that checks the mouse position and modifies the data appropriately? Then you'd write a custom drawing method to fill the custom view, and you could use the same exact draw method to write to an NSImage which you could export.
You'll need to do a bit o' math. For each "pixel", call -set on the appropriate NSColor, then use NSBezierPath's -fillRect method. It may help you to get out a pencil & paper to figure out the math for the rect origins & sizes.
Check http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CocoaDrawingGuide/Introduction/Introduction.html for help if you've never done custom drawing before. It's really not that bad, just takes a little reading. :)
I am making a simple game that uses "AI players" (they aren't really AI players). I need to find out if a certain part of the "map" I am using has certain colors, so I can make the "AI players" do certain things. Is it possible to do this?
I don't know if this will help, but a game called "Warcraft 3" uses a very similar thing to determine certain things, such as movement. If you know of this game, it should be a lot easier to understand this question.
I think this may be possible if I put the image into a custom NSView subclass, but I have not yet learned how to check colors there either.
The best way to do this would be not to bother checking the colors of the actual image (which can be an expensive operation if you're checking a lot of individual pixels), but to indicate in your map's data structure the characteristics you want to have, and then take both the color and player behavior from that.
In pseudocode:
// Draw Map
foreach currSquare in listOfSquares:
if map[currSquare].hasPropertyX():
drawSquare(currSquare, blue)
else if map[currSquare].hasPropertyY():
drawSquare(currSquare, red)
// Move pieces
foreach currPlayer in listOfPlayers:
squareIAmStandingOn = currPlayer.square
if map[squareIAmStandingOn].hasPropertyX():
currPlayer.takeActionX()
else if map[squareIAmStandingOn].hasPropertyY():
currPlayer.takeActionY()
Create a NSBitmapImageRep from the NSImage and use colorAtX:y: to get the color.
Check:
NSBitmapImageRep Class Reference
I'm working on an iPhone app that has some non-rectangular UI elements. Currently, I'm subclassing UIView, and in drawRect I'm using a CGPathRef to draw black border and a color-filled interior.
I'd like to make these items look more like "buttons", though, so I'd like to have some of the same sort of "glass effects" that are used on e.g. the icons for an iPhone app (when you don't set UIPrerenderedIcon to true), or in other buttons.
I hunted around, and found this, which seems to be close to what I need:
Gradients on UIView and UILabels On iPhone
But I'm having difficulty figuring out how to clip the gradient to my shape.
It seems like the mask property on the view would be the right place to go, which seems like it would call for me to create a new CALayer object, with the clipping somehow applied to it.
I'm hoping there's some nice convenience function for doing this, though if I need to write something more complicated, that's OK, too. I'm just having difficulty figuring out how to apply the path as a mask. I'm unsure if I need to create a new drawing context and draw the path into it? And then use CGContextClip?
I think I've got a lot of the right pieces figured out, I'm just having difficulty understanding how to assemble them.
Could someone please point me in the right direction? (I'm happy to read more in the docs, just point me in the right direction, please.)
You can create a CAShapeLayer and set its path to your CGPathRef. Then set the mask property of a CAGradientLayer to your shapeLayer.