public void updateSelectedOctant(GL gl, GLU glu, float[] mousePosition, float[] pickRectangle) {
// Start Picking mode
int capacity =
1 * 4 * visibleLeaves.size(); // Each object take in maximium : 4 * name stack depth
IntBuffer hitsBuffer = BufferUtil.newIntBuffer(capacity);
gl.glSelectBuffer(hitsBuffer.capacity(), hitsBuffer);
gl.glRenderMode(GL.GL_SELECT);
gl.glDisable(GL.GL_CULL_FACE); // Disable flags
gl.glInitNames();
gl.glPushName(0);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glPushMatrix();
gl.glLoadIdentity();
glu.gluPickMatrix(
mousePosition[0],
mousePosition[1],
pickRectangle[0],
pickRectangle[1],
drawable.getViewport());
gl.glMultMatrixd(drawable.getProjectionMatrix());
gl.glMatrixMode(GL.GL_MODELVIEW);
// Draw the nodes' cube int the select buffer
int hitName = 1;
for (int i = 0; i < visibleLeaves.size(); i++) {
Octant node = visibleLeaves.get(i);
gl.glLoadName(hitName);
node.displayOctant(gl);
hitName++;
}
// Restoring the original projection matrix
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glPopMatrix();
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glFlush();
// Returning to normal rendering mode
int nbRecords = gl.glRenderMode(GL.GL_RENDER);
if (vizController.getVizModel().isCulling()) {
gl.glEnable(GL.GL_CULL_FACE);
gl.glCullFace(GL.GL_BACK);
}
// Clean previous selection
selectedLeaves.clear();
// Get the hits and put the node under selection in the selectionArray
for (int i = 0; i < nbRecords; i++) {
int hit = hitsBuffer.get(i * 4 + 3) - 1; // -1 Because of the glPushName(0)
Octant nodeHit = visibleLeaves.get(hit);
selectedLeaves.add(nodeHit);
}
}
private void refreshLimits() {
float minX = Float.POSITIVE_INFINITY;
float maxX = Float.NEGATIVE_INFINITY;
float minY = Float.POSITIVE_INFINITY;
float maxY = Float.NEGATIVE_INFINITY;
float minZ = Float.POSITIVE_INFINITY;
float maxZ = Float.NEGATIVE_INFINITY;
for (Octant o : leaves) {
float octanSize = o.getSize() / 2f;
minX = Math.min(minX, o.getPosX() - octanSize);
maxX = Math.max(maxX, o.getPosX() + octanSize);
minY = Math.min(minY, o.getPosY() - octanSize);
maxY = Math.max(maxY, o.getPosY() + octanSize);
minZ = Math.min(minZ, o.getPosZ() - octanSize);
maxZ = Math.max(maxZ, o.getPosZ() + octanSize);
}
int viewportMinX = Integer.MAX_VALUE;
int viewportMaxX = Integer.MIN_VALUE;
int viewportMinY = Integer.MAX_VALUE;
int viewportMaxY = Integer.MIN_VALUE;
double[] point;
point = drawable.myGluProject(minX, minY, minZ); // bottom far left
viewportMinX = Math.min(viewportMinX, (int) point[0]);
viewportMinY = Math.min(viewportMinY, (int) point[1]);
viewportMaxX = Math.max(viewportMaxX, (int) point[0]);
viewportMaxY = Math.max(viewportMaxY, (int) point[1]);
point = drawable.myGluProject(minX, minY, maxZ); // bottom near left
viewportMinX = Math.min(viewportMinX, (int) point[0]);
viewportMinY = Math.min(viewportMinY, (int) point[1]);
viewportMaxX = Math.max(viewportMaxX, (int) point[0]);
viewportMaxY = Math.max(viewportMaxY, (int) point[1]);
point = drawable.myGluProject(minX, maxY, maxZ); // up near left
viewportMinX = Math.min(viewportMinX, (int) point[0]);
viewportMinY = Math.min(viewportMinY, (int) point[1]);
viewportMaxX = Math.max(viewportMaxX, (int) point[0]);
viewportMaxY = Math.max(viewportMaxY, (int) point[1]);
point = drawable.myGluProject(maxX, minY, maxZ); // bottom near right
viewportMinX = Math.min(viewportMinX, (int) point[0]);
viewportMinY = Math.min(viewportMinY, (int) point[1]);
viewportMaxX = Math.max(viewportMaxX, (int) point[0]);
viewportMaxY = Math.max(viewportMaxY, (int) point[1]);
point = drawable.myGluProject(maxX, minY, minZ); // bottom far right
viewportMinX = Math.min(viewportMinX, (int) point[0]);
viewportMinY = Math.min(viewportMinY, (int) point[1]);
viewportMaxX = Math.max(viewportMaxX, (int) point[0]);
viewportMaxY = Math.max(viewportMaxY, (int) point[1]);
point = drawable.myGluProject(maxX, maxY, minZ); // up far right
viewportMinX = Math.min(viewportMinX, (int) point[0]);
viewportMinY = Math.min(viewportMinY, (int) point[1]);
viewportMaxX = Math.max(viewportMaxX, (int) point[0]);
viewportMaxY = Math.max(viewportMaxY, (int) point[1]);
point = drawable.myGluProject(maxX, maxY, maxZ); // up near right
viewportMinX = Math.min(viewportMinX, (int) point[0]);
viewportMinY = Math.min(viewportMinY, (int) point[1]);
viewportMaxX = Math.max(viewportMaxX, (int) point[0]);
viewportMaxY = Math.max(viewportMaxY, (int) point[1]);
point = drawable.myGluProject(minX, maxY, minZ); // up far left
viewportMinX = Math.min(viewportMinX, (int) point[0]);
viewportMinY = Math.min(viewportMinY, (int) point[1]);
viewportMaxX = Math.max(viewportMaxX, (int) point[0]);
viewportMaxY = Math.max(viewportMaxY, (int) point[1]);
limits.setMinXoctree(minX);
limits.setMaxXoctree(maxX);
limits.setMinYoctree(minY);
limits.setMaxYoctree(maxY);
limits.setMinZoctree(minZ);
limits.setMaxZoctree(maxZ);
limits.setMinXviewport(viewportMinX);
limits.setMaxXviewport(viewportMaxX);
limits.setMinYviewport(viewportMinY);
limits.setMaxYviewport(viewportMaxY);
}