Application: gvSIG desktop

        double diameter = radius*2;

        double x;

        double y;

        double start;

        double extent;

        double angleOffset;

        final double pi2 = Math.PI*2;

        angleOffset = 0;

        if( angleExt<0 ) {

            angleOffset = pi2 + angleExt;

            angleExt = Math.abs(angleExt);

        }

        x = center.getX() - radius;

        y = center.getY() - radius;

        if( angleExt > 0 && (angleExt % pi2) == 0  ) {

            start = 0;

            extent = 360;

        } else {

            angleExt = angleExt % pi2; //Asumimos que aqui angleExt es siempre positivo

            startAngle = Math.abs(startAngle) % pi2;

            start = Math.toDegrees( pi2 - startAngle + angleOffset) ;

            extent = - Math.toDegrees(pi2 - angleExt);

        }

        double angleStart = Math.toRadians(-start);

        double initX = x + (Math.cos(angleStart) * 0.5 + 0.5) * diameter;

        double initY = y + (Math.sin(angleStart) * 0.5 + 0.5) * diameter;

        init = new Point2D(initX, initY);

        double angleEnd = Math.toRadians(-start - extent);

        double endX = x + (Math.cos(angleEnd) * 0.5 + 0.5) * diameter;

        double endY = y + (Math.sin(angleEnd) * 0.5 + 0.5) * diameter;

        end =  new Point2D(endX, endY);

        double angleMiddle = Math.toRadians(-start - extent)/2;

        double middleX = x + (Math.cos(angleMiddle) * 0.5 + 0.5) * diameter;

        double middleY = y + (Math.sin(angleMiddle) * 0.5 + 0.5) * diameter;

        middle =  new Point2D(middleX, middleY);