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PORibbon Graphs (charts) with Core Graphics
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  1. PORibbon Graphs (charts) with Core Graphics
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    copied!<p>I am generating a classic line graph using core graphics, which renders and work very well. There are several lines stacking one after another using "layer.zPosition"</p> <pre><code>-(void)drawRect:(CGRect)rect { float colorChange = (0.1 * [self tag]); theFillColor = [UIColor colorWithRed:(colorChange) green:(colorChange*0.50) blue:colorChange alpha:0.75f].CGColor; CGContextRef c = UIGraphicsGetCurrentContext(); CGFloat white[4] = {1.0f, 1.0f, 1.0f, 1.0f}; CGContextSetFillColorWithColor(c, theFillColor); CGContextSetStrokeColor(c, white); CGContextSetLineWidth(c, 2.0f); CGContextBeginPath(c); // CGContextMoveToPoint(c, 0.0f, 200-[[array objectAtIndex:0] floatValue]); CGContextAddLineToPoint(c, 0.0f, 200-[[array objectAtIndex:0] floatValue]); // distancePerPoint = (rect.size.width / [array count]); float lastPointX = 750.0; for (int i = 0 ; i &lt; [array count] ; i++) { CGContextAddLineToPoint(c, (i*distancePerPoint), 200-[[array objectAtIndex:i] floatValue]); lastPointX = (i*distancePerPoint); } // CGContextAddLineToPoint(c, lastPointX, 200.0); CGContextAddLineToPoint(c, 0, 200); CGContextClosePath(c); // //CGContextFillPath(c); CGContextDrawPath(c, kCGPathFillStroke); //CGContextDrawPath(c, kCGPathStroke); } </code></pre> <p>(The above code is generating the following result): <img src="https://i.stack.imgur.com/zk9NL.jpg" alt="enter image description here"></p> <p>(I can post the code I am using for the 3d effect if needed, but the way I do it is generically by CATransform3D rotationAndPerspectiveTransform = CATransform3DIdentity;)</p> <p><strong>Question:</strong> How can I transform my line graph to have depth ? I would like to have a "depth" to the line(s) graph (thus making them a ribbon) as later I would like to represent them using rotation And Perspective Transform (as stated above)</p> <p><img src="https://i.stack.imgur.com/CMmwP.jpg" alt="enter image description here"></p>
 

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