StandardDialFrame.java 文件源码

protected Shape getOuterWindow(Rectangle2D frame) {
    double radiusMargin = 0.02;
    double angleMargin = 1.5;
    Rectangle2D innerFrame = DialPlot.rectangleByRadius(frame, 
            this.innerRadius - radiusMargin, this.innerRadius 
            - radiusMargin);
    Rectangle2D outerFrame = DialPlot.rectangleByRadius(frame, 
            this.outerRadius + radiusMargin, this.outerRadius 
            + radiusMargin);
    Arc2D inner = new Arc2D.Double(innerFrame, this.startAngle 
            - angleMargin, this.extent + 2 * angleMargin, Arc2D.OPEN);
    Arc2D outer = new Arc2D.Double(outerFrame, this.startAngle 
            + angleMargin + this.extent, - this.extent - 2 * angleMargin, 
            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;

}