public void displayInit(Point pickPoint) {
gl.glShadeModel(GL.GL_SMOOTH);
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
if (pickPoint != null) {
int[] vp = new int[4];
gl.glGetIntegerv(GL.GL_VIEWPORT, vp, 0);
GLU glu = new GLU();
int px = (int) pickPoint.getX();
int py = (int) (vp[3] - pickPoint.getY());
glu.gluPickMatrix(px, py, 1e-2, 1e-2, vp, 0);
}
gl.glOrtho(0, bounds.getWidth(), 0, bounds.getHeight(), .1, depth);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
glu.gluLookAt(0, 0, depth - 0.1, 0, 0, 0, 0, 1, 0);
gl.glInitNames();
gl.glPushName(-1);
}
/*
* sets up selection mode, name stack, and projection matrix for picking.
* Then the objects are drawn.
*/
private void pickRects(GL2 gl) {
int[] selectBuf = new int[BUFSIZE];
IntBuffer selectBuffer = GLBuffers.newDirectIntBuffer(BUFSIZE);
int hits;
int viewport[] = new int[4];
// int x, y;
gl.glGetIntegerv(GL.GL_VIEWPORT, viewport, 0);
gl.glSelectBuffer(BUFSIZE, selectBuffer);
gl.glRenderMode(GL2.GL_SELECT);
gl.glInitNames();
gl.glPushName(-1);
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glPushMatrix();
gl.glLoadIdentity();
/* create 5x5 pixel picking region near cursor location */
glu.gluPickMatrix(
(double) pickPoint.x,
(double) (viewport[3] - pickPoint.y), //
5.0,
5.0,
viewport,
0);
gl.glOrtho(0.0, 8.0, 0.0, 8.0, -0.5, 2.5);
drawRects(gl, GL2.GL_SELECT);
gl.glPopMatrix();
gl.glFlush();
hits = gl.glRenderMode(GL2.GL_RENDER);
selectBuffer.get(selectBuf);
processHits(hits, selectBuf);
}
// private void pickSquares(GL gl, int button, int state, int x, int y)
private void pickSquares(GL2 gl) {
int selectBuf[] = new int[BUFSIZE];
IntBuffer selectBuffer = IntBuffer.wrap(selectBuf);
int hits;
int viewport[] = new int[4];
// if (button != GLUT_LEFT_BUTTON || state != GLUT_DOWN) return;
gl.glGetIntegerv(GL2.GL_VIEWPORT, viewport, 0);
gl.glSelectBuffer(BUFSIZE, selectBuffer);
gl.glRenderMode(GL2.GL_SELECT);
gl.glInitNames();
gl.glPushName(0);
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glPushMatrix();
gl.glLoadIdentity();
/* create 5x5 pixel picking region near cursor location */
glu.gluPickMatrix(
(double) pickPoint.x, (double) (viewport[3] - pickPoint.y), 5.0, 5.0, viewport, 0);
glu.gluOrtho2D(0.0, 3.0, 0.0, 3.0);
drawSquares(gl, GL2.GL_SELECT);
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glPopMatrix();
gl.glFlush();
hits = gl.glRenderMode(GL2.GL_RENDER);
selectBuffer.get(selectBuf);
processHits(hits, selectBuf);
}
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);
}
}