本文介绍了点内圆角矩形?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
void ContextAddRoundedRect(CGContextRef ctx,CGRect矩形,CGFloat半径){
CGFloat minX = CGRectGetMinX(rect);
CGFloat maxX = CGRectGetMaxX(rect);
CGFloat minY = CGRectGetMinY(rect);
CGFloat maxY = CGRectGetMaxY(rect);
CGContextMoveToPoint(ctx,minX + radius,minY);
CGContextAddArcToPoint(ctx,maxX,minY,maxX,minY + radius,radius);
CGContextAddArcToPoint(ctx,maxX,maxY,maxX - radius,maxY,radius);
CGContextAddArcToPoint(ctx,minX,maxY,minX,maxY - radius,radius);
CGContextAddArcToPoint(ctx,minX,minY,minX + radius,minY,radius);
}
如何判断给定的CGPoint是否在我的矩形内考虑圆角?
解决方案
不是直接将它构建到 CGContextRef
就像这样,你可以将它构建为,然后使用 - [UIBezierPath containsPoint:]
p>
当您准备好实际将路径呈现到上下文中时,您可以通过以下方式进行操作:
CGContextAddPath(ctx,[myBezierPath CGPath]);
I have this code to draw rounded rectangles:
void ContextAddRoundedRect(CGContextRef ctx, CGRect rect, CGFloat radius) {
CGFloat minX = CGRectGetMinX(rect);
CGFloat maxX = CGRectGetMaxX(rect);
CGFloat minY = CGRectGetMinY(rect);
CGFloat maxY = CGRectGetMaxY(rect);
CGContextMoveToPoint(ctx, minX + radius, minY);
CGContextAddArcToPoint(ctx, maxX, minY, maxX, minY + radius, radius);
CGContextAddArcToPoint(ctx, maxX, maxY, maxX - radius, maxY, radius);
CGContextAddArcToPoint(ctx, minX, maxY, minX, maxY - radius, radius);
CGContextAddArcToPoint(ctx, minX, minY, minX + radius, minY, radius);
}
how can I figure out if a given CGPoint is inside my rect, considering the rounded corners?
解决方案
Instead of building it directly into the CGContextRef
like this, you can build it instead as a UIBezierPath
, and then use -[UIBezierPath containsPoint:]
.
When you're ready to actually render your path into the context, you can do so via:
CGContextAddPath(ctx, [myBezierPath CGPath]);
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