public static final void drawGrid(final Canvas canvas, final OrbiterMouseHandler orbiter) {
final double s = 500.0;
final double minimumX = orbiter.getCenterX() - s;
final double maximumX = orbiter.getCenterX() + s;
final double minimumY = orbiter.getCenterY() - s;
final double maximumY = orbiter.getCenterY() + s;
final double z = 0.0;
final int stripes = 10;
final double amplitudeX = maximumX - minimumX;
final double amplitudeY = maximumY - minimumY;
final int n = 3 * 2 * (stripes + 1) * 2;
final double[] segments = new double[n];
for (int i = 0, j = 0; i <= stripes; ++i) {
segments[j++] = minimumX;
segments[j++] = minimumY + i * amplitudeY / stripes;
segments[j++] = z;
segments[j++] = maximumX;
segments[j++] = minimumY + i * amplitudeY / stripes;
segments[j++] = z;
segments[j++] = minimumX + i * amplitudeX / stripes;
segments[j++] = minimumY;
segments[j++] = z;
segments[j++] = minimumX + i * amplitudeY / stripes;
segments[j++] = maximumY;
segments[j++] = z;
}
orbiter.transform(segments);
final Graphics2D g = canvas.getGraphics();
final int bottom = canvas.getHeight() - 1;
g.setColor(Color.GRAY);
for (int i = 0; i < n; i += 6) {
g.drawLine(
iround(segments[i + 0]),
iround(bottom - segments[i + 1]),
iround(segments[i + 3]),
iround(bottom - segments[i + 4]));
}
}
/**
* @param commandLineArguments <br>
* Unused
*/
public static final void main(final String[] commandLineArguments) {
final DoubleList vertices = new DoubleList();
final DoubleList masses = new DoubleList();
vertices.addAll(0.0, 0.0, -640000000.0);
masses.addAll(Double.POSITIVE_INFINITY);
final DoubleList transformedVertices = new DoubleList();
final Canvas canvas = new Canvas().setFormat(600, 600, BufferedImage.TYPE_3BYTE_BGR);
final Canvas ids =
new Canvas().setFormat(canvas.getWidth(), canvas.getHeight(), BufferedImage.TYPE_3BYTE_BGR);
final JLabel view = new JLabel(new ImageIcon(canvas.getImage()));
final AtomicInteger idUnderMouse = new AtomicInteger(-1);
final OrbiterMouseHandler orbiter =
new OrbiterMouseHandler(null)
.setCenterX(canvas.getWidth() / 2.0)
.setCenterY(canvas.getHeight() / 2.0);
new MouseHandler(orbiter.getUpdateNeeded()) {
private double massUnderMouse;
@Override
public final void mouseMoved(final MouseEvent event) {
if (event.isConsumed()) {
return;
}
final int newIdUnderMouse =
(ids.getImage().getRGB(event.getX(), event.getY()) & 0x00FFFFFF) - 1;
final int oldIdUnderMouse = idUnderMouse.getAndSet(newIdUnderMouse);
if (newIdUnderMouse != oldIdUnderMouse) {
if (0 <= oldIdUnderMouse) {
masses.set(oldIdUnderMouse, this.massUnderMouse);
}
if (0 <= newIdUnderMouse) {
this.massUnderMouse = masses.get(newIdUnderMouse);
masses.set(newIdUnderMouse, Double.POSITIVE_INFINITY);
}
this.getUpdateNeeded().set(true);
}
}
@Override
public final void mouseDragged(final MouseEvent event) {
if (event.isConsumed()) {
return;
}
final int offsetUnderMouse = idUnderMouse.get() * 3;
final double[] locations = transformedVertices.toArray();
if (0 <= offsetUnderMouse) {
final double[] location = {
locations[offsetUnderMouse + X],
locations[offsetUnderMouse + Y],
locations[offsetUnderMouse + Z]
};
location[X] = event.getX();
location[Y] = canvas.getHeight() - 1 - event.getY();
orbiter.inverseTransform(location);
vertices.set(offsetUnderMouse + X, location[X]);
vertices.set(offsetUnderMouse + Y, location[Y]);
vertices.set(offsetUnderMouse + Z, location[Z]);
event.consume();
}
this.getUpdateNeeded().set(true);
}
/** {@value}. */
private static final long serialVersionUID = 1415975957612152368L;
}.addTo(view);
final StickMan stickMan =
new StickMan(vertices, masses)
.translate(orbiter.getCenterX(), orbiter.getCenterY(), orbiter.getCenterZ());
orbiter.addTo(view);
show(view, Demo.class.getName(), false);
new Animator(view) {
@Override
protected final boolean animateFrame() {
if (orbiter.getUpdateNeeded().getAndSet(false)) {
transformedVertices.clear().addAll(vertices.toArray());
orbiter.transform(transformedVertices.toArray());
canvas.clear(Color.BLACK);
ids.clear(Color.BLACK);
drawGrid(canvas, orbiter);
stickMan.draw(transformedVertices.toArray(), canvas, ids, idUnderMouse, orbiter);
drawAxes(canvas, orbiter);
}
{
final int n = vertices.size();
for (int i = 3; i < n; i += 3) {
final double m = masses.get(i / 3);
if (!Double.isInfinite(m)) {
final double oldZ = vertices.get(i + Z);
final double newZ = max(0.0, oldZ - 10.0);
if (oldZ != newZ) {
orbiter.getUpdateNeeded().set(true);
vertices.set(i + Z, newZ);
}
}
}
}
while (10.0 < stickMan.update()) {
orbiter.getUpdateNeeded().set(true);
}
return view.isShowing();
}
/** {@value}. */
private static final long serialVersionUID = -809734448123973442L;
}.setFrameRate(10.0).animate();
}