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POCAAnimation with a CGPath using arrays of values
 

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  1. POCAAnimation with a CGPath using arrays of values
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    <p>I have a UIView with shapes drawn from a path, inside a loop using values from an array for radius and stroke width. The blends are important, as well as the switch colours (ignore the rgb macro). </p> <p>What I want to do is animate from the <code>oldShapeRadius</code> values to the <code>newShapeRadius</code> affecting the radius of the arc and <code>strokeWidth</code> of the <code>strokedArc</code>.</p> <p>Now I have looked at a lot of examples of Core Animation, but I can't see how it would affect the drawing of the effects as I have below, and how to work with CALayers? </p> <pre><code>//my UIView #import "QuartzCore/CALayer.h" #define degreesToRadians( degrees ) ( ( degrees ) / 180.0 * M_PI ) - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { self.strokeWidth=38.0f; self.radius=47.0f; oldShapeRadius=[[NSMutableArray alloc] initWithObjects:[NSNumber numberWithFloat:1], [NSNumber numberWithFloat:1], [NSNumber numberWithFloat:1.0], [NSNumber numberWithFloat:1], nil]; newShapeRadius=[[NSMutableArray alloc] initWithObjects:[NSNumber numberWithFloat:0.6], [NSNumber numberWithFloat:0.9], [NSNumber numberWithFloat:1.0], [NSNumber numberWithFloat:0.5], nil]; } } - (void)drawRect:(CGRect)rect { for (int i=0; i&lt;4; i++) { UIColor *shapeColor; switch (i) { case 0: shapeColor=UIColorFromRGB(CATEGORY_COLOR_BLUE); break; case 1: shapeColor=UIColorFromRGB(CATEGORY_COLOR_GREEN); break; case 2: shapeColor=UIColorFromRGB(CATEGORY_COLOR_PINK); break; case 3: shapeColor=UIColorFromRGB(CATEGORY_COLOR_YELLOW); break; default: break; } CGMutablePathRef arc = CGPathCreateMutable(); CGPathAddArc(arc, NULL, 160.0f,85, radius*[[oldShapeRadius objectAtIndex:i] floatValue], degreesToRadians(90*i), degreesToRadians(90*(i+1)), NO); CGPathRef strokedArc =CGPathCreateCopyByStrokingPath(arc, NULL, strokeWidth*[[oldShapeRadius objectAtIndex:i] floatValue], kCGLineCapRound,kCGLineJoinRound,0.0f); context = UIGraphicsGetCurrentContext(); CGContextSetBlendMode(context, kCGBlendModeMultiply); CGContextAddPath(context, strokedArc); CGContextSetFillColorWithColor(context, shapeColor.CGColor); CGContextDrawPath(context, kCGPathFill); } } </code></pre> <p>Oh Lords of Stackoverflow may I have some help please. Is High Lord David Rönnqvist around haha. Many thanks in advance.</p>
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    1. COLet me point you to this [tutorial](http://blog.pixelingene.com/2012/02/animating-pie-slices-using-a-custom-calayer/) it's about 90% what you're trying to accomplish, the final blending step could be achieved following this other [SO answer](http://stackoverflow.com/questions/1658751/composite-colors-calayer-and-blend-mode-on-iphone).
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    2. COYes I got it going but now I am trying to add the blends.! thanks @Can
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