ios - CGPath裁剪

Question

我想做类似这样的东西:

我尝试了以下代码:

CGMutablePathRef path = CGPathCreateMutable();
CGPathAddLines(path, &CGAffineTransformIdentity, points, sizeof points / sizeof *points);

CGMutablePathRef strokePath = (CGMutablePathRef)CGPathCreateCopyByStrokingPath(path, &CGAffineTransformIdentity, data.lineWidth, kCGLineCapRound, kCGLineJoinMiter, 4.f);

for(NSInteger i = 0; i < [data.values count]; i++) {
    CGRect rect = CGRectMake(points[i].x - data.dotRadius, points[i].y - data.dotRadius, data.dotRadius * 2, data.dotRadius * 2);
    CGPathAddEllipseInRect(strokePath, &CGAffineTransformIdentity, rect);
    CGPathAddEllipseInRect(strokePath, &CGAffineTransformIdentity, CGRectInset(rect, data.lineWidth, data.lineWidth));
}

然后绘制这条路径:

CAShapeLayer *layer = self.layers[line];
layer.path = strokePath;
layer.strokeColor = nil;
layer.fillColor = data.lineColor.CGColor;
layer.fillRule = kCAFillRuleEvenOdd;

Bt 给出类似的东西:

有谁知道我如何才能做到这一点？

Answer 1

画线和圆，不是复合路径，而是两条线和一个圆(没有任何填充规则)。然后使用 kCGBlendModeClear 绘制一个较小的实心圆，“打出”圆心的孔。

或者，首先剪掉圆心的孔。然后画线和圆。