/**
* Add a zone to the zone picker.
*
* @param zone the zone to enable picking on.
*/
public void add(Zone zone) {
// check if we already have this zone
if (zoneMap.containsValue(zone)) return;
if (zoneMap.size() == POSSIBLE_COLORS) {
// We've run out of pick colours :( oh no
System.err.printf(
"The number of zones has exceeded the maximum number of pickable zones (%d). This recently added zone (%s) will not be pickable.",
POSSIBLE_COLORS, zone);
return;
}
// get a new colour
zone.setPickColor(new Color(currentColor, false));
int pixelColor = 0xff + (currentColor << 8);
zoneMap.put(pixelColor, zone);
// dont bother searching if we're out of colours anyways
if (zoneMap.size() < POSSIBLE_COLORS) {
while (zoneMap.containsKey(pixelColor)) {
currentColor += 1;
pixelColor = 0xff + (currentColor << 8);
}
}
// add all of the zone's child zones
for (Zone child : zone.getChildren()) this.add(child);
}
/**
* Get the Zone under the specified coordinates.
*
* @param x x coordinate of the specified pixel
* @param y y coordinate of the specified pixel
* @return If there is a Zone at the specified coordinates, that zone, otherwise null.
*/
public Zone pick(int x, int y) {
// clamp x and y
if (y >= picking_context.height) y = picking_context.height - 1;
if (x >= picking_context.width) x = picking_context.width - 1;
if (y < 0) y = 0;
if (x < 0) x = 0;
PGL pgl = picking_context.beginPGL();
int pixel;
// force fallback until 2.0b10
if (!SMT.fastPickingEnabled() || pgl == null) {
// really slow way(max 70 fps on a high end card vs 200+ fps with readPixels), with loadPixels
// at the end of render()
pixel = picking_context.pixels[x + y * picking_context.width];
} else {
buffer.clear();
pgl.readPixels(x, picking_context.height - y, 1, 1, GL.GL_RGBA, GL.GL_UNSIGNED_BYTE, buffer);
pixel = buffer.getInt();
}
picking_context.endPGL();
if (zoneMap.containsKey(pixel)) {
// if mapped it is either a Zone or null (background)
Zone picked = zoneMap.get(pixel);
Zone current = picked;
while (current != null) {
if (current.stealChildrensTouch) return current;
current = current.getParent();
}
return picked;
} else return null;
}