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POHow to set up a user Quartz2D coordinate system with scaling that avoids fuzzy drawing?
 

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  1. POHow to set up a user Quartz2D coordinate system with scaling that avoids fuzzy drawing?
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    <p>This topic has been scratched once or twice, but I am still puzzled. And Google was not friendly either.</p> <p>Since Quartz allows for arbitrary coordinate systems using affine transforms, I want to be able to draw things such as floorplans using real-life coordinate, e.g. feet.</p> <p>So basically, for the sake of an example, I want to scale the view so that when I draw a 10x10 rectangle (think a 10-inch box for example), I get a 60x60 pixels rectangle.</p> <p>It works, except the rectangle I get is quite fuzzy. Another question here got an answer that explains why. However, I'm not sure I understood that reason why, and moreover, I don't know how to fix it. Here is my code:</p> <p>I set my coordinate system in my <code>awakeFromNib</code> custom view method:</p> <pre><code>- (void) awakeFromNib { CGAffineTransform scale = CGAffineTransformMakeScale(6.0, 6.0); self.transform = scale; } </code></pre> <p>And here is my draw routine:</p> <pre><code>- (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); CGRect r = CGRectMake(10., 10., 10., 10.); CGFloat lineWidth = 1.0; CGContextStrokeRectWithWidth(context, r, lineWidth); } </code></pre> <p>The square I get is scaled just fine, but totally fuzzy. Playing with <code>lineWidth</code> doesn't help: when <code>lineWidth</code> is set smaller, it gets lighter, but not crisper.</p> <p>So is there a way to set up a view to have a scaled coordinate system, so that I can use my domain coordinates? Or should I go back and implementing scaling in my drawing routines?</p> <p>Note that this issue doesn't occur for translation or rotation.</p> <p>Thanks</p>
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    1. USJean-Denis Muys
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