几个部分具有不同线宽的QML画布笔触

import QtQuick 2.0

Rectangle {
    width: 200
    height: 200

    Canvas {
        anchors.fill: parent

        onPaint: {
            var ctx = getContext("2d");

            // 绘制线条1
            ctx.lineWidth = 1;
            ctx.strokeStyle = "red";
            ctx.beginPath();
            ctx.moveTo(50, 50);
            ctx.lineTo(150, 50);
            ctx.stroke();

            // 绘制线条2
            ctx.lineWidth = 3;
            ctx.strokeStyle = "blue";
            ctx.beginPath();
            ctx.moveTo(50, 100);
            ctx.lineTo(150, 100);
            ctx.stroke();
        }
    }
}