HarmonyOS如何绘制多边形并给多边形填充颜色

class TriangleRenderNode extends RenderNode { 
  flag: boolean = false; 
  color: common2D.Color = {alpha: 255, red: 255, green: 0, blue: 0} 
 
  draw(context: DrawContext) { 
 
    const canvas = context.canvas; 
    const pen = new drawing.Pen(); 
    pen.setStrokeWidth(vp2px(1)); 
    pen.setColor(this.color); 
    let path = new drawing.Path(); 
    path.moveTo(0,0); 
    path.lineTo(vp2px(context.size.width),0); 
    path.lineTo(vp2px(context.size.width*0.5),vp2px(context.size.height)); 
    path.lineTo(0,0) 
    path.close(); 
    canvas.attachPen(pen); 
    canvas.drawPath(path); 
    canvas.detachPen(); 
  } 
}