三角形和多边形和线条

=============================================
<BoxLayoutWidget>:
    canvas:
        Color:
            rgba:[1,1,1,1]
        # 三角形
        Ellipse:
            size:self.width*0.5,self.height*0.15
            pos:self.x+100,self.y+1
            segments:3
            source:'back.jpg'
           

=======================或者========================

<BoxLayoutWidget>:
    canvas:
        Color:
            rgba:[1,1,1,1]
        # 三角形
        Triangle:
　　　　　　　# 三个顶点
            points:310,250, 640,280, 480,500
            source:'back.jpg'



===================多边形========================

<BoxLayoutWidget>:
    canvas:
        Color:
            rgba:[1,1,1,1]
        # 三角形
        Triangle:
            points:20,15,15,200,40,30
            source:'back.jpg'
        # 多边形
        Quad:
            points:310,250,640,280,480,500,380,520
            source:'back.jpg'

==============线条======================

<BoxLayoutWidget>:
    canvas:
        Color:
            rgba:[1,1,1,1]
        # 线条
        Line:
            points:310,350,640,380
        # 形状
        Point:
            # 下面是两个点
            points:300,200,300,300
            # 像素
            pointsize:5