使用CAShape图层绘制两条平行线

问题描述

我在绘制一条直线，

CAShapeLayer *lineShape = nil;
CGMutablePathRef linePath = nil;
linePath = CGPathCreateMutable();
lineShape = [CAShapeLayer layer];

lineShape.lineWidth = 1.0f;
lineShape.lineCap = kCALineJoinMiter;
lineShape.strokeColor = [[UIColor redColor] CGColor];


CGPathMoveToPoint(linePath, NULL, x, y);
CGPathAddLineToPoint(linePath, NULL, toX, toY);

lineShape.path = linePath;
CGPathRelease(linePath);

[myView.layer addSublayer:lineShape];

我想在这条线上画一条平行线。有任何想法或计算方法吗？

i want to draw a parallel line to this line . Any idea or calculation?

或者是否有任何代码可以获取该特定行的接触点。实际上，当我在两条线之间触摸时可以得到触摸点，并且通过 CGPathContainsPoint 方法可以在两条线之间获得触摸点，因此我想在此处创建两条平行线。

or is there any code for getting touch point of this particular line . actually i can get touch point when i touch between two lines and from CGPathContainsPoint method i can get touch point between two lines , hence i want to create two parallel lines here.

推荐答案

b-班次。并且需要转换坐标

b - shift. and you need convert coordinates

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