/** The scene's implementation of the init method. */
public void init(GLAutoDrawable drawable) {
super.init(drawable);
System.out.println("FlyingTextScene - init");
final GL gl = drawable.getGL();
// Create the text renderer
renderer = new TextRenderer(new Font("Palatino Linotype", Font.TRUETYPE_FONT, 72), true);
// Create the background texture
BufferedImage bgImage = new BufferedImage(2, 2, BufferedImage.TYPE_BYTE_GRAY);
Graphics2D g = bgImage.createGraphics();
g.setColor(new Color(0.3f, 0.3f, 0.3f));
g.fillRect(0, 0, 2, 2);
g.setColor(new Color(0.7f, 0.7f, 0.7f));
g.fillRect(0, 0, 1, 1);
g.fillRect(1, 1, 1, 1);
g.dispose();
backgroundTexture = TextureIO.newTexture(bgImage, false);
backgroundTexture.bind();
backgroundTexture.setTexParameteri(GL.GL_TEXTURE_MIN_FILTER, GL.GL_NEAREST);
backgroundTexture.setTexParameteri(GL.GL_TEXTURE_MAG_FILTER, GL.GL_NEAREST);
backgroundTexture.setTexParameteri(GL.GL_TEXTURE_WRAP_S, GL.GL_REPEAT);
backgroundTexture.setTexParameteri(GL.GL_TEXTURE_WRAP_T, GL.GL_REPEAT);
width = glComposite.getCanvas().getWidth();
height = glComposite.getCanvas().getHeight();
// Compute maximum width of text we're going to draw to avoid
// popping in/out at edges
maxTextWidth = (int) renderer.getBounds("Java 2D").getWidth();
maxTextWidth = Math.max(maxTextWidth, (int) renderer.getBounds("OpenGL").getWidth());
// Create random text
textInfo.clear();
for (int i = 0; i < NUM_STRINGS; i++) {
textInfo.add(randomTextInfo());
}
// Set up properties; note we don't need the depth buffer in this demo
gl.glDisable(GL.GL_DEPTH_TEST);
glComposite.initAnimator(drawable, 100);
}
/** Here we actually draw the scene. */
public void display(GLAutoDrawable drawable) {
super.display(drawable);
System.out.println("GLScene - display");
GL gl = drawable.getGL();
try {
// Update velocities and positions of all text
float deltaT = 0.1f;
Point2f tmp = new Point2f();
for (Iterator<TextInfo> iter = textInfo.iterator(); iter.hasNext(); ) {
TextInfo info = (TextInfo) iter.next();
// Randomize things a little bit at run time
if (random.nextInt(1000) == 0) {
info.angularVelocity = INIT_ANG_VEL_MAG * (randomAngle() - 180);
info.velocity = randomVelocity(INIT_VEL_MAG, INIT_VEL_MAG);
}
// Now update angles and positions
info.angle += info.angularVelocity * deltaT;
tmp.set(info.velocity);
tmp.scale(deltaT);
info.position.add(tmp);
// Update color
info.curTime += deltaT;
if (info.curTime > 2 * Math.PI) {
info.curTime -= 2 * Math.PI;
}
int rgb =
Color.HSBtoRGB(info.h, (float) (0.5 * (1 + Math.sin(info.curTime)) * info.s), info.v);
info.r = ((rgb >> 16) & 0xFF) / 255.0f;
info.g = ((rgb >> 8) & 0xFF) / 255.0f;
info.b = (rgb & 0xFF) / 255.0f;
// Wrap angles and positions
if (info.angle < 0) {
info.angle += 360;
} else if (info.angle > 360) {
info.angle -= 360;
}
// Use maxTextWidth to avoid popping in/out at edges
// Would be better to do oriented bounding rectangle computation
if (info.position.x < -maxTextWidth) {
info.position.x = info.position.x + glComposite.getCanvas().getWidth() + 2 * maxTextWidth;
} else if (info.position.x > glComposite.getCanvas().getWidth() + maxTextWidth) {
info.position.x = info.position.x - glComposite.getCanvas().getWidth() - 2 * maxTextWidth;
}
if (info.position.y < -maxTextWidth) {
info.position.y =
info.position.y + glComposite.getCanvas().getHeight() + 2 * maxTextWidth;
} else if (info.position.y > glComposite.getCanvas().getHeight() + maxTextWidth) {
info.position.y =
info.position.y - glComposite.getCanvas().getHeight() - 2 * maxTextWidth;
}
}
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
glComposite
.getGLU()
.gluOrtho2D(
0, glComposite.getCanvas().getWidth(), 0, glComposite.getCanvas().getHeight());
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
// Draw the background texture
backgroundTexture.enable();
backgroundTexture.bind();
TextureCoords coords = backgroundTexture.getImageTexCoords();
int w = glComposite.getCanvas().getWidth();
int h = glComposite.getCanvas().getHeight();
float fw = w / 100.0f;
float fh = h / 100.0f;
gl.glTexEnvi(GL.GL_TEXTURE_ENV, GL.GL_TEXTURE_ENV_MODE, GL.GL_REPLACE);
gl.glBegin(GL.GL_QUADS);
gl.glTexCoord2f(fw * coords.left(), fh * coords.bottom());
gl.glVertex3f(0, 0, 0);
gl.glTexCoord2f(fw * coords.right(), fh * coords.bottom());
gl.glVertex3f(w, 0, 0);
gl.glTexCoord2f(fw * coords.right(), fh * coords.top());
gl.glVertex3f(w, h, 0);
gl.glTexCoord2f(fw * coords.left(), fh * coords.top());
gl.glVertex3f(0, h, 0);
gl.glEnd();
backgroundTexture.disable();
// Render all text
renderer.beginRendering(w, h);
// Note we're doing some slightly fancy stuff to position the text.
// We tell the text renderer to render the text at the origin, and
// manipulate the modelview matrix to put the text where we want.
gl.glMatrixMode(GL.GL_MODELVIEW);
// First render drop shadows
renderer.setColor(0, 0, 0, 0.5f);
for (Iterator<TextInfo> iter = textInfo.iterator(); iter.hasNext(); ) {
TextInfo info = (TextInfo) iter.next();
gl.glLoadIdentity();
gl.glTranslatef(
info.position.x + dropShadowDistance, info.position.y - dropShadowDistance, 0);
gl.glRotatef(info.angle, 0, 0, 1);
renderer.draw(info.text, 0, 0);
renderer.flush();
}
// Now render the actual text
for (Iterator<TextInfo> iter = textInfo.iterator(); iter.hasNext(); ) {
TextInfo info = (TextInfo) iter.next();
gl.glLoadIdentity();
gl.glTranslatef(info.position.x, info.position.y, 0);
gl.glRotatef(info.angle, 0, 0, 1);
renderer.setColor(info.r, info.g, info.b, 1);
renderer.draw(info.text, 0, 0);
renderer.flush();
}
renderer.endRendering();
} catch (Exception e) {
e.printStackTrace();
}
}