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我想学习和CoreGraphics的我遇到一个奇怪的现象，奇怪的行为，希望有人能帮助我明白怎么回事...与UIBezierPath addClip
我绘制一个矩形，并在其中我画给量钻石，形状可以与不同的填充要绘制的（空的，填充并与条纹）我的拉伸矩形函数看起来像这样：
- (void)drawRect:(CGRect)rect
{
UIBezierPath* roundedRect = [UIBezierPath bezierPathWithRoundedRect:self.bounds cornerRadius:9.0];
//don't draw where the round corners "cut" the rectangle
[roundedRect addClip];
//set a white background
[[UIColor whiteColor] setFill];
UIRectFill(self.bounds);
//set a black frame
[[UIColor darkGrayColor] setStroke];
[roundedRect stroke];
self.shade = STRIPED;
self.color = [UIColor greenColor];
self.number = 3;
rectOffset = self.bounds.size.width/(self.number * 2);
[self drawDiamondNumberOfTimes:self.number startOrigin:self.bounds.origin];
}
drawDiamondNumberOfTimes：startOrigin：是计算矩形的递归函数，其中的形状将使用笔划绘制并绘制钻石边界
- (void) drawDiamondNumberOfTimes:(int) p_times startOrigin:(CGPoint) p_origin
{
if(p_times > 0)
{
CGRect drawArea;
drawArea.origin = CGPointMake(p_origin.x + rectOffset-shapeSize.width/2, self.bounds.size.height/4);
drawArea.size = shapeSize;
UIBezierPath *diamond = [[UIBezierPath alloc] init];
[diamond moveToPoint:CGPointMake(drawArea.origin.x, drawArea.origin.y+ shapeSize.height/2)];
[diamond addLineToPoint:CGPointMake(drawArea.origin.x+shapeSize.width/2, drawArea.origin.y)];
[diamond addLineToPoint:CGPointMake(drawArea.origin.x+shapeSize.width, drawArea.origin.y+ shapeSize.height/2)];
[diamond addLineToPoint:CGPointMake(drawArea.origin.x+shapeSize.width/2, drawArea.origin.y+ shapeSize.height)];
[diamond closePath];
[self.color setStroke];
[diamond stroke];
[self drawShadeOfDraw:diamond atRect:drawArea];
drawArea.origin.x += rectOffset + shapeSize.width/2;
[self drawDiamondNumberOfTimes:p_times-1 startOrigin:drawArea.origin ];
}
}
drawShadeOfDraw：atRect：设置不同的填充 - 在发生奇怪的行为:) 空和固体填充它的作品完美，但有条纹，如果我写[p_symbol addClip]我总是得到一个菱形条纹即使self.number设置为2或3。无[p_symbol addClip]我得到的钻石正确的号码，但是，当然，条纹遍布长方形，这里是drawShadeOfDraw代码：atRect：
- (void)drawShadeOfDraw:(UIBezierPath*)p_symbol atRect:(CGRect)p_drawArea
{
switch (self.shade)
{
case STRIPED:
{
[p_symbol addClip];
for(int y = p_drawArea.origin.y; y < p_drawArea.origin.y+ p_drawArea.size.height; y+= 6)
{
[p_symbol moveToPoint:CGPointMake(p_drawArea.origin.x, y)];
[p_symbol addLineToPoint:CGPointMake(p_drawArea.origin.x+shapeSize.width, y)];
[self.color setStroke];
[p_symbol stroke];
}
break;
}
case SOLID:
{
[self.color setFill];
[p_symbol fill];
break;
}
default:
{
break;
}
}
}
一个图像比千字好，所以这里有两个:)
希望有人能帮助我理解它是如何工作的，什么我做错了
感谢