public void changeColor() {
// set initial color of top left quadrant
if ((cxLoc < vLine.getStart().getX()) && (cyLoc < hLine.getStart().getY())) {
ball.setColor(Color.cyan);
}
// set initial color of top right quadrant
if ((cxLoc > vLine.getStart().getX()) && (cyLoc < hLine.getStart().getY())) {
ball.setColor(Color.magenta);
}
// set initial color of bottom left quadrant
if ((cxLoc < vLine.getStart().getX()) && (cyLoc > hLine.getStart().getY())) {
ball.setColor(Color.yellow);
}
// set initial color of bottom right quadrant
if ((cxLoc > vLine.getStart().getX()) && (cyLoc > hLine.getStart().getY())) {
ball.setColor(Color.black);
}
}
public void resizeBall() {
// if it grows set xLoc, YLoc and
// increment, otherwise false.
if (grow) {
if (size < MAX_SIZE) {
double xLoc = cxLoc + size / 2;
double yLoc = cyLoc + size / 2;
size += GROWTH;
ball.setSize(size, size);
cxLoc = xLoc - size / 2;
cyLoc = yLoc - size / 2;
ball.moveTo(cxLoc, cyLoc);
} else {
grow = false;
}
} else {
// otherwise shrink
if ((size <= MAX_SIZE) && (size > MIN_SIZE)) {
double xLoc = cxLoc + size / 2;
double yLoc = cyLoc + size / 2;
size -= GROWTH;
ball.setSize(size, size);
cxLoc = xLoc - size / 2;
cyLoc = yLoc - size / 2;
ball.moveTo(cxLoc, cyLoc);
} else {
grow = true;
}
}
// time delay to prevent lag
pause(100 - speed);
}
public void actionPerformed(ActionEvent evt) {
// if start is pressed, activate run method
if (evt.getActionCommand().equals("Start")) {
start();
}
// if stop is pressed, stop all of the balls
// and change color.
if (evt.getActionCommand().equals("Stop")) {
stop();
changeColor();
}
// if clear all is pressed, clear all of the balls
// from the canvas.
if (evt.getActionCommand().equals("Clear All")) {
ball.removeFromCanvas();
}
}
public void mousePressed(MouseEvent evt) {
// Checks if the MouseEvent evt lies on the ball
// and creates variable b_grabbed.
b_grabbed = ball.contains(new Location(evt.getPoint()));
}