Erase operation in quartz 2D
Any suggestions on how to perform erase operat开发者_JAVA技巧ions in Quartz 2D?
CGContextClearRect(UIGraphicsGetCurrentContext(), rect);
if (clear) {
CGContextSetBlendMode(UIGraphicsGetCurrentContext(),kCGBlendModeNormal);
CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), [UIColor colorWithPatternImage:[UIImage imageNamed:@"rainbow-colors-orange-320x480.jpg"]].CGColor);
// your background image. make sure it is same size
} else {
CGContextSetBlendMode(UIGraphicsGetCurrentContext(),kCGBlendModeNormal);
NSUInteger red, green, blue;
sscanf([stringColor UTF8String], "#%02X%02X%02X", &red, &green, &blue);
UIColor *colors = [UIColor colorWithRed:red/255.0 green:green/255.0 blue:blue/255.0 alpha:1];
CGContextSetStrokeColorWithColor(UIGraphicsGetCurrentContext(), [colors CGColor]);
}
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