public void updatePosition() {
Point position = new Point(spaceOccupied.x, spaceOccupied.y);
// Insert random behavior. During
// each update, a sprite has about
// one chance in 10 of making a
// random change to its
// motionVector. When a change
// occurs, the motionVector
// coordinate values are forced to
// fall between -7 and 7. This
// puts a cap on the maximum speed
// for a sprite.
if (rand.nextInt() % 10 == 0) {
Point randomOffset = new Point(rand.nextInt() % 3, rand.nextInt() % 3);
motionVector.x += randomOffset.x;
if (motionVector.x >= 7) motionVector.x -= 7;
if (motionVector.x <= -7) motionVector.x += 7;
motionVector.y += randomOffset.y;
if (motionVector.y >= 7) motionVector.y -= 7;
if (motionVector.y <= -7) motionVector.y += 7;
} // end if
// Move the sprite on the screen
position.translate(motionVector.x, motionVector.y);
// Bounce off the walls
boolean bounceRequired = false;
Point tempMotionVector = new Point(motionVector.x, motionVector.y);
// Handle walls in x-dimension
if (position.x < bounds.x) {
bounceRequired = true;
position.x = bounds.x;
// reverse direction in x
tempMotionVector.x = -tempMotionVector.x;
} else if ((position.x + spaceOccupied.width) > (bounds.x + bounds.width)) {
bounceRequired = true;
position.x = bounds.x + bounds.width - spaceOccupied.width;
// reverse direction in x
tempMotionVector.x = -tempMotionVector.x;
} // end else if
// Handle walls in y-dimension
if (position.y < bounds.y) {
bounceRequired = true;
position.y = bounds.y;
tempMotionVector.y = -tempMotionVector.y;
} else if ((position.y + spaceOccupied.height) > (bounds.y + bounds.height)) {
bounceRequired = true;
position.y = bounds.y + bounds.height - spaceOccupied.height;
tempMotionVector.y = -tempMotionVector.y;
} // end else if
if (bounceRequired)
// save new motionVector
setMotionVector(tempMotionVector);
// update spaceOccupied
setSpaceOccupied(position);
} // end updatePosition()
public void mousePressed(MouseEvent e) {
requestFocus();
Point p = e.getPoint();
int size =
Math.min(
MAX_SIZE,
Math.min(
getWidth() - imagePadding.left - imagePadding.right,
getHeight() - imagePadding.top - imagePadding.bottom));
p.translate(-(getWidth() / 2 - size / 2), -(getHeight() / 2 - size / 2));
if (mode == ColorPicker.BRI || mode == ColorPicker.SAT) {
// the two circular views:
double radius = ((double) size) / 2.0;
double x = p.getX() - size / 2.0;
double y = p.getY() - size / 2.0;
double r = Math.sqrt(x * x + y * y) / radius;
double theta = Math.atan2(y, x) / (Math.PI * 2.0);
if (r > 1) r = 1;
if (mode == ColorPicker.BRI) {
setHSB((float) (theta + .25f), (float) (r), bri);
} else {
setHSB((float) (theta + .25f), sat, (float) (r));
}
} else if (mode == ColorPicker.HUE) {
float s = ((float) p.x) / ((float) size);
float b = ((float) p.y) / ((float) size);
if (s < 0) s = 0;
if (s > 1) s = 1;
if (b < 0) b = 0;
if (b > 1) b = 1;
setHSB(hue, s, b);
} else {
int x2 = p.x * 255 / size;
int y2 = p.y * 255 / size;
if (x2 < 0) x2 = 0;
if (x2 > 255) x2 = 255;
if (y2 < 0) y2 = 0;
if (y2 > 255) y2 = 255;
if (mode == ColorPicker.RED) {
setRGB(red, x2, y2);
} else if (mode == ColorPicker.GREEN) {
setRGB(x2, green, y2);
} else {
setRGB(x2, y2, blue);
}
}
}
private static JButton getButton(JList<String> list, Point pt, int index) {
Component c =
list.getCellRenderer().getListCellRendererComponent(list, "", index, false, false);
Rectangle r = list.getCellBounds(index, index);
c.setBounds(r);
// c.doLayout(); //may be needed for mone LayoutManager
pt.translate(-r.x, -r.y);
Component b = SwingUtilities.getDeepestComponentAt(c, pt.x, pt.y);
if (b instanceof JButton) {
return (JButton) b;
} else {
return null;
}
}