📄 pie3dplot.java
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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(Color.lightGray);
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(Color.lightGray);
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(Color.lightGray);
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(Color.lightGray);
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(Color.lightGray);
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(Color.lightGray);
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(Color.lightGray);
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(Color.lightGray);
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(Color.lightGray);
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(Color.lightGray);
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(Color.lightGray);
g2.draw(side2);
}
}
}
}
}
/**
* Returns a short string describing the type of plot.
*
* @return <i>Pie 3D Plot</i>.
*/
public String getPlotType () {
return "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 true if the angle is at the front of the pie.
*/
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);
}
}
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