// Private methods created to clean up Paint(Graphics);
private void prepareCircle(Graphics canvas, int i) {
// Chooses a random location on the canvas to paint circle number i;
X[i] = random.nextInt(canvas.getWidth() - circleDiameter);
Y[i] = random.nextInt(canvas.getWidth() - circleDiameter);
// Chooses a random color for circle number i;
Color[i] = rgbToColor(random.nextInt(256), random.nextInt(256), random.nextInt(256), 255);
// Randomly selects whether circle number i will be an outline or a filled object;
isFill[i] = (random.nextDouble() < 0.5);
}
@Override
// Paints circles to the canvas, according to the parameters X, Y, Color, isFill, as declared by
// the prepareCircle method;
public void paint(Graphics canvas) {
// Clear the canvas for future painting;
canvas.clearRect(0, 0, canvas.getWidth(), canvas.getHeight());
// Prepares all of the circles to print to the screen when the program is initialized;
if (!isFirstTime) {
for (int i = 0; i < nCircles; i++) {
prepareCircle(canvas, i);
}
isFirstTime = true;
}
// Moves the least recently adjusted circle to a new random location with a new random color;
else {
prepareCircle(canvas, currentCircle);
}
// Paints the circles to the screen; Multiple for loops ensure that the most recently painted
// circles remain on top;
for (int i = currentCircle + 1; i < nCircles; i++) {
paintCircle(canvas, i);
}
for (int i = 0; i <= currentCircle; i++) {
paintCircle(canvas, i);
}
// Pushes currentCircle forward through the Arrays; resets currentCircle at the end of the
// cycle;
currentCircle++;
if (currentCircle == nCircles) {
currentCircle = 0;
}
}
