Qt(QML)虚线圆 [英] Qt (QML) Dashed Circle

问题描述

有什么方法可以在QML中绘制半虚线圆吗?我以这种方式画了半圈

Is there any way to draw half dashed circle in QML? I drawn half circle in this way

   var Circle = getContext("2d");
          Circle.save();
          var CircleGradient = 
 Circle.createLinearGradient(parent.width/4,parent.height,parent.width/4,0);
        CircleGradient.addColorStop(0, firstGradientPoint);
                  CircleGradient.addColorStop(1, secondGradientPoint);
                  Circle.clearRect(0, 0, parent.width, parent.height);
                  Circle.beginPath();
                  Circle.lineCap = "round";
                  Circle.lineWidth = 10;
                  Circle.strokeStyle = CircleGradient
                  Circle.arc(parent.width/2, parent.height/2, canvas.radius - (Circle.lineWidth / 2), Math.PI/2, canvas.Value);
                  Circle.stroke();
                  Circle.restore();

结果

但是我怎么能像这样破折号呢?

But how can I make it dashed like this.

我需要

推荐答案

我知道这个问题已经过时了，但它可能会对某人有所帮助.您可以使用 Qt快速形状(自Qt 5.10)呈现您想要的内容.它不是复制粘贴代码，而是更多方法:

I know that this question is very outdated, but it might help someone. You can use Qt Quick Shapes (since Qt 5.10) to render what you want. It's not copy-paste code, but more of an approach:

Shape {
    ShapePath {
        id: shapePath
        strokeColor: "black"
        strokeStyle: ShapePath.DashLine
        dashPattern: [6, 8]
        fillColor: "transparent"

        PathArc {
            x: 0
            y: radiusX + radiusY
            radiusX: 100
            radiusY: 100
            useLargeArc: true
        }
    }
}

PathArc 文档包含了您所需的几乎所有内容.这里还有一些形状示例.

PathArc documentation has pretty much everything you need. Here are some more Shape Examples.

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