// This gets called by the constructor, hopefully only
// once but it can be called at any time. Called prior to any
// Window creation so it can only set variables, not draw things
public void init() {
/* initialize the widget */
int width = gl.getWidth();
int height = gl.getHeight();
// Initialize the rendering viewport size to OpenGL
gl.viewport(0, 0, width, height);
gl.matrixMode(GL.PROJECTION); // Set up the camera mode
gl.loadIdentity(); // Reset the transformation matrix
if (width <= height)
gl.ortho(
-50.0,
50.0,
-50.0 * (double) height / (double) width,
50.0 * (double) height / (double) width,
-1.0,
1.0);
else
gl.ortho(
-50.0 * (double) width / (double) height,
50.0 * (double) width / (double) height,
-50.0,
50.0,
-1.0,
1.0);
gl.matrixMode(GL.MODELVIEW); // Reset to model transforms
}
// Simple redirector to our display function
public void paint(Graphics g) {
// First call the base class paint method to do a one time
// Initialization - specific to the JoglCanvas class
super.paint(g);
// System.out.println("Call to paint");
display();
}
// Thread thingy to run at start thread
public void run() {
try {
while (true) {
gl.use();
spinDisplay();
Thread.sleep(10);
}
} catch (InterruptedException e) {
// the user sent an interupt,
// So lets exit...
}
}
// Sort of a legacy type function call, actually inside Java
// This stuff should be in the paint call
public synchronized void display() {
// clear the screen and draw a yellow square
gl.clear(GL.COLOR_BUFFER_BIT);
// First rectangle
gl.pushMatrix();
gl.translate(-0.5, 0.0, 0.0);
gl.rotate(spin, 0.0, 0.0, 1.0);
gl.rect(-0.5, -0.5, 0.5, 0.5);
gl.popMatrix();
// Second rectangle
gl.pushMatrix();
gl.translate(0.5, 0.0, 0.0);
gl.rotate(-spin, 0.0, 0.0, 1.0);
gl.rect(-0.5, -0.5, 0.5, 0.5);
gl.popMatrix();
gl.flush(); // Make sure all commands have completed.
gl.swap(); // Swap the render buffer with the screen buffer
}
// Handle the keystrokes
public void keyTyped(KeyEvent e) {
switch (e.getKeyChar()) {
case 'h':
gl.matrixMode(GL.MODELVIEW); /* manipulate modelview matrix */
gl.rotate(15.0, 0.0, 1.0, 0.0);
break;
case 'j':
gl.matrixMode(GL.MODELVIEW); /* manipulate modelview matrix */
gl.rotate(15.0, 1.0, 0.0, 0.0);
break;
case 'k':
gl.matrixMode(GL.MODELVIEW); /* manipulate modelview matrix */
gl.rotate(-15.0, 1.0, 0.0, 0.0);
break;
case 'l':
gl.matrixMode(GL.MODELVIEW); /* manipulate modelview matrix */
gl.rotate(-15.0, 0.0, 1.0, 0.0);
break;
case '+':
gl.matrixMode(GL.PROJECTION); /* manipulate Projection matrix */
gl.translate(0.0, 0.0, 0.5);
e.consume();
break;
case '-':
gl.matrixMode(GL.PROJECTION); /* manipulate Projection matrix */
gl.translate(0.0, 0.0, -0.5);
e.consume();
break;
case 's':
if (r_thread == null) {
r_thread = new Thread(this);
r_thread.start();
}
break;
case 'p':
if (r_thread != null) {
r_thread.interrupt();
r_thread = null;
}
break;
case 27: /* Esc will quit */
System.exit(1);
break;
default:
break;
}
e.consume();
display();
}