public void changeCamColorPrev() {
// keep the same color, just change opacity
int c = cam.getColor();
int r = (c >> 16) & 255;
int g = (c >> 8) & 255;
int b = c & 255;
cam.changeToColor(color(r, g, b, 40));
}
public void changeCamColorNext() {
// keep the same color, just change opacity
int c = cam.getColor();
int r = (c >> 16) & 255;
int g = (c >> 8) & 255;
int b = c & 255;
cam.changeToColor(color(r, g, b));
cam.setNextShapeActive();
}