Draws a closed contour consisting of straight line segments. Click where you want to start the polygon, and drag to draw a line segment. Click again to define the end of the line segment, and continue clicking to define the remaining line segments of the polygon. Double-click to finish drawing the polygon. To constrain the polygon to angles of 45 degree, hold down Shift when you click.
绘制由直线段组成的封闭轮廓。在要开始绘制多边形的位置单击，然后拖动以绘制直线段，再次单击以定义线段的端点，继续单击以定义多边形其余的线段。双击以完成多边形的绘制。要将多边形的角度限制为 45 度，请在单击的同时按住 Shift 键。