基本圖形:
<rect>片仿、<circle>纹安、<ellipse>、<line>砂豌、<polyline>厢岂、<polygon>
基本屬性:
fill、stroke阳距、stroke-width塔粒、transform
<rect> x y width height rx ry
<circle> cx cy r
<ellipse> cx cy rx ry
<line> x1 y1 x2 y2
<polyline> points 格式(xi,yi)+ points = "x1 y1 x2 y2 x3 y3 x4 y4"
<polygon> points 格式(xi,yi)+ points = "x1 y1 x2 y2 x3 y3 x4 y4"