iphone: rewrite GLPaint using Core Graphics
I would like to rewrite the Apple source code, GLPaint application, but not using OpenGL like the example, I would like to use Core Graphics library. But I stuck in displaying the texture like GLPaint.
This is my code in Core Graphics:
- (void) drawLineFromPoint: (CGPoint) fromPoint toPoint: (CGPoint) toPoint {
UIGraphicsBeginImageContext(self.frame.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[drawImage.image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
UIImage * image = [UIImage imageNamed:@"Particle.png"];
UIColor * color = [UIColor colorWithPatternImage:image];
CGContextSetStrokeColorWithColor(context, color.CGColor);
CGContextSetLineCap(context, kCGLineCapRound);
CGContextSetLineWidth(context, 5.0);
CGContextBeginPath(context);
CGContextMoveToPoint(context, fromPoint.x, fromPoint.y);
CGContextAddLineToPoint(context, toPoint.x, toPoint.y);
CGContextStrokePath(context);
drawImage.image = UIGraphicsGetImageFromCur开发者_Go百科rentImageContext();
UIGraphicsEndImageContext();
}
--- But I receive this result:
--- I would like to have this result:
Does my code wrong? Any one can help me on this? Thank you very much.
If you don't want the pattern, don't set a colour with a pattern image as your stroke colour.
Instead of
UIImage * image = [UIImage imageNamed:@"Particle.png"];
UIColor * color = [UIColor colorWithPatternImage:image];
Just do
UIColor *color = [UIColor blackColor];
Kindly make sure you have the Particle.png added to the project. Also check the constants kBrushScale and kPalette* in GLPaint code.
加载中,请稍侯......
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