pieplot3d.java

这是一个segy数据显示程序

                            side.intersect(back);
                            g2.setPaint(paint);
                            g2.fill(side);
                            g2.setPaint(outlinePaint);
                            g2.draw(side);
                        }
                    }
                    else {  // starts at the back, wraps around front, and finishes at back again
                        Area side1 = new Area(
                            new Rectangle2D.Double(
                                arc.getStartPoint().getX(), plotArea.getY(),
                                plotArea.getMaxX() - arc.getStartPoint().getX(),
                                plotArea.getHeight()
                            )
                        );
                        side1.intersect(back);

                        Area side2 = new Area(
                            new Rectangle2D.Double(
                                plotArea.getX(), plotArea.getY(),
                                arc.getEndPoint().getX() - plotArea.getX(),
                                plotArea.getHeight()
                            )
                        );

                        side2.intersect(back);

                        g2.setPaint(paint);
                        if (drawBack) {
                            g2.fill(side1);
                            g2.fill(side2);
                        }

                        if (drawFront) {
                            g2.fill(front);
                        }

                        g2.setPaint(outlinePaint);
                        if (drawBack) {
                            g2.draw(side1);
                            g2.draw(side2);
                        }

                        if (drawFront) {
                            g2.draw(front);
                        }

                    }
                }
                else {  // starts at back, finishes at front (CLOCKWISE)

                    if (drawBack) {
                        Area side1 = new Area(
                            new Rectangle2D.Double(
                                arc.getStartPoint().getX(), plotArea.getY(),
                                plotArea.getMaxX() - arc.getStartPoint().getX(),
                                plotArea.getHeight()
                            )
                        );
                        side1.intersect(back);
                        g2.setPaint(paint);
                        g2.fill(side1);
                        g2.setPaint(outlinePaint);
                        g2.draw(side1);
                    }

                    if (drawFront) {
                        Area side2 = new Area(
                            new Rectangle2D.Double(
                                arc.getEndPoint().getX(), plotArea.getY(),
                                plotArea.getMaxX() - arc.getEndPoint().getX(),
                                plotArea.getHeight()
                            )
                        );
                        side2.intersect(front);
                        g2.setPaint(paint);
                        g2.fill(side2);
                        g2.setPaint(outlinePaint);
                        g2.draw(side2);
                    }

                }
            }
        }
        else if (extent > 0.0) {  // the pie sections are arranged ANTICLOCKWISE

            if (isAngleAtFront(start)) {  // segment starts at the front

                if (!isAngleAtBack(end)) {  // and finishes at the front

                    if (extent < 180.0) {  // segment only occupies the front
                        if (drawFront) {
                            Area side = new Area(
                                new Rectangle2D.Double(
                                    arc.getStartPoint().getX(), plotArea.getY(),
                                    arc.getEndPoint().getX() - arc.getStartPoint().getX(),
                                    plotArea.getHeight()
                                )
                            );
                            side.intersect(front);
                            g2.setPaint(paint);
                            g2.fill(side);
                            g2.setPaint(outlinePaint);
                            g2.draw(side);
                        }
                    }
                    else {  // segments wraps right around the back...
                        Area side1 = new Area(
                            new Rectangle2D.Double(
                                arc.getStartPoint().getX(), plotArea.getY(),
                                plotArea.getMaxX() - arc.getStartPoint().getX(),
                                plotArea.getHeight()
                            )
                        );
                        side1.intersect(front);

                        Area side2 = new Area(
                            new Rectangle2D.Double(
                                plotArea.getX(), plotArea.getY(),
                                arc.getEndPoint().getX() - plotArea.getX(),
                                plotArea.getHeight()
                            )
                        );
                        side2.intersect(front);

                        g2.setPaint(paint);
                        if (drawFront) {
                            g2.fill(side1);
                            g2.fill(side2);
                        }

                        if (drawBack) {
                            g2.fill(back);
                        }

                        g2.setPaint(outlinePaint);
                        if (drawFront) {
                            g2.draw(side1);
                            g2.draw(side2);
                        }

                        if (drawBack) {
                            g2.draw(back);
                        }

                    }
                }
                else {  // segments starts at front and finishes at back...
                    if (drawBack) {
                        Area side2 = new Area(
                            new Rectangle2D.Double(
                                arc.getEndPoint().getX(), plotArea.getY(),
                                plotArea.getMaxX() - arc.getEndPoint().getX(),
                                plotArea.getHeight()
                            )
                        );
                        side2.intersect(back);
                        g2.setPaint(paint);
                        g2.fill(side2);
                        g2.setPaint(outlinePaint);
                        g2.draw(side2);
                    }

                    if (drawFront) {
                        Area side1 = new Area(
                            new Rectangle2D.Double(
                                arc.getStartPoint().getX(), plotArea.getY(),
                                plotArea.getMaxX() - arc.getStartPoint().getX(),
                                plotArea.getHeight()
                            )
                        );
                        side1.intersect(front);
                        g2.setPaint(paint);
                        g2.fill(side1);
                        g2.setPaint(outlinePaint);
                        g2.draw(side1);
                    }
                }
            }
            else {  // segment starts at back

                if (!isAngleAtFront(end)) {
                    if (extent < 180.0) {  // and finishes at back
                        if (drawBack) {
                            Area side = new Area(
                                new Rectangle2D.Double(
                                    arc.getEndPoint().getX(), plotArea.getY(),
                                    arc.getStartPoint().getX() - arc.getEndPoint().getX(),
                                    plotArea.getHeight()
                                )
                            );
                            side.intersect(back);
                            g2.setPaint(paint);
                            g2.fill(side);
                            g2.setPaint(outlinePaint);
                            g2.draw(side);
                        }
                    }
                    else {  // starts at back and wraps right around to the back again
                        Area side1 = new Area(
                            new Rectangle2D.Double(
                                arc.getStartPoint().getX(), plotArea.getY(),
                                plotArea.getX() - arc.getStartPoint().getX(),
                                plotArea.getHeight()
                            )
                        );
                        side1.intersect(back);

                        Area side2 = new Area(
                            new Rectangle2D.Double(
                                arc.getEndPoint().getX(), plotArea.getY(),
                                plotArea.getMaxX() - arc.getEndPoint().getX(),
                                plotArea.getHeight()
                            )
                        );
                        side2.intersect(back);

                        g2.setPaint(paint);
                        if (drawBack) {
                            g2.fill(side1);
                            g2.fill(side2);
                        }

                        if (drawFront) {
                            g2.fill(front);
                        }

                        g2.setPaint(outlinePaint);
                        if (drawBack) {
                            g2.draw(side1);
                            g2.draw(side2);
                        }

                        if (drawFront) {
                            g2.draw(front);
                        }

                    }
                }
                else {  // starts at the back and finishes at the front (wrapping the left side)
                    if (drawBack) {
                        Area side1 = new Area(
                            new Rectangle2D.Double(
                                plotArea.getX(), plotArea.getY(),
                                arc.getStartPoint().getX() - plotArea.getX(),
                                plotArea.getHeight()
                            )
                        );
                        side1.intersect(back);
                        g2.setPaint(paint);
                        g2.fill(side1);
                        g2.setPaint(outlinePaint);
                        g2.draw(side1);
                    }

                    if (drawFront) {
                        Area side2 = new Area(
                            new Rectangle2D.Double(
                                plotArea.getX(), plotArea.getY(),
                                arc.getEndPoint().getX() - plotArea.getX(),
                                plotArea.getHeight()
                            )
                        );
                        side2.intersect(front);
                        g2.setPaint(paint);
                        g2.fill(side2);
                        g2.setPaint(outlinePaint);
                        g2.draw(side2);
                    }
                }
            }

        }

    }

    /**
     * Returns a short string describing the type of plot.
     *
     * @return <i>Pie 3D Plot</i>.
     */
    public String getPlotType () {
        return localizationResources.getString("Pie_3D_Plot");
    }

    /**
     * A utility method that returns true if the angle represents a point at the front of the
     * 3D pie chart.  0 - 180 degrees is the back, 180 - 360 is the front.
     *
     * @param angle  the angle.
     *
     * @return A boolean.
     */
    private boolean isAngleAtFront(double angle) {
        return (Math.sin(Math.toRadians(angle)) < 0.0);
    }

    /**
     * A utility method that returns true if the angle represents a point at the back of the
     * 3D pie chart.  0 - 180 degrees is the back, 180 - 360 is the front.
     *
     * @param angle  the angle.
     *
     * @return true if the angle is at the back of the pie.
     */
    private boolean isAngleAtBack(double angle) {
        return (Math.sin(Math.toRadians(angle)) > 0.0);
    }

}