CanvasContext.setLineCap

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CanvasContext.setLineCap(lineCap)

<!-- index.ttml -->
箭头样式示例，样式顺序：
<block tt:for="{{lineJoinTypes}}">
  <view>{{item}}</view>
</block>
<canvas canvas-id="myCanvas"></canvas>

// index.js
Page({
  data: {
    lineJoinTypes: ["bevel", "round", "miter"],
  },
  onLoad: function (options) {
    const canvasCtx = tt.createCanvasContext("myCanvas");
    canvasCtx.beginPath();
    canvasCtx.setLineJoin("bevel");
    canvasCtx.setLineWidth(10);
    canvasCtx.moveTo(50, 10);
    canvasCtx.lineTo(140, 50);
    canvasCtx.lineTo(50, 90);
    canvasCtx.stroke();
    canvasCtx.beginPath();
    canvasCtx.setLineJoin("round");
    canvasCtx.setLineWidth(10);
    canvasCtx.moveTo(90, 10);
    canvasCtx.lineTo(180, 50);
    canvasCtx.lineTo(90, 90);
    canvasCtx.stroke();
    canvasCtx.beginPath();
    canvasCtx.setLineJoin("miter");
    canvasCtx.setLineWidth(10);
    canvasCtx.moveTo(130, 10);
    canvasCtx.lineTo(220, 50);
    canvasCtx.lineTo(130, 90);
    canvasCtx.stroke();
    canvasCtx.draw();
  },
});