/**
* 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;
}
protected void drawForPicker(PGraphics3D pickBuffer, MeshSection section) {
pickBuffer.pushMatrix();
pickBuffer.translate(pos.x, pos.y, pos.z);
pickBuffer.rotateX(rot.x);
pickBuffer.rotateY(rot.y);
pickBuffer.rotateZ(rot.z);
pickBuffer.scale(shapeScale);
pickBuffer.noStroke();
PVector c;
for (int p = section.sNS; p < section.eNS - 1; p++) {
pickBuffer.beginShape(TRIANGLE_STRIP);
pickBuffer.fill(pickColor);
for (int t = section.sEW; t < section.eEW; t++) {
c = coord[t][p];
pickBuffer.vertex(c.x, c.y, c.z);
c = coord[t][p + 1];
pickBuffer.vertex(c.x, c.y, c.z);
}
pickBuffer.endShape();
}
pickBuffer.popMatrix();
}
