StandardDialFrame.java 文件源码

/**
 * Returns the shape for the window for this dial.  Some dial layers will
 * request that their drawing be clipped within this window.
 *
 * @param frame  the reference frame (<code>null</code> not permitted).
 *
 * @return The shape of the dial's window.
 */
public Shape getWindow(Rectangle2D frame) {

    Rectangle2D innerFrame = DialPlot.rectangleByRadius(frame, 
            this.innerRadius, this.innerRadius);
    Rectangle2D outerFrame = DialPlot.rectangleByRadius(frame, 
            this.outerRadius, this.outerRadius);
    Arc2D inner = new Arc2D.Double(innerFrame, this.startAngle, this.extent, 
            Arc2D.OPEN);
    Arc2D outer = new Arc2D.Double(outerFrame, this.startAngle 
            + this.extent, - this.extent, Arc2D.OPEN);
    GeneralPath p = new GeneralPath();
    Point2D point1 = inner.getStartPoint();
    p.moveTo((float) point1.getX(), (float) point1.getY());
    p.append(inner, true);
    p.append(outer, true);
    p.closePath();
    return p;

}