UIBezierPath Triangle with rounded edges

Question

I have designed this code to generate a Bezier Path that is used as a path for a CAShapeLayer to mask a UIView (the view\'s height and width are variable)

This code

Answer 1

@David's geometry is cool and educational. But you really don't need to go through the whole geometry this way. I'll offer a much simpler code:

CGFloat radius = 20;
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, (center.x + bottomLeft.x) / 2, (center.y + bottomLeft.y) / 2);
CGPathAddArcToPoint(path, NULL, bottomLeft.x, bottomLeft.y, bottomRight.x, bottomRight.y, radius);
CGPathAddArcToPoint(path, NULL, bottomRight.x, bottomRight.y, center.x, center.y, radius);
CGPathAddArcToPoint(path, NULL, center.x, center.y, bottomLeft.x, bottomLeft.y, radius);
CGPathCloseSubpath(path);

UIBezierPath *bezierPath = [UIBezierPath bezierPathWithCGPath:path];
CGPathRelease(path);

bezierPath is what you need. The key point is that CGPathAddArcToPoint does the geometry for you.