processing4/java/examples/Basics/Input/Mouse1D/Mouse1D.pde

/**
 * Mouse 1D. 
 * 
 * Move the mouse left and right to shift the balance. 
 * The "mouseX" variable is used to control both the 
 * size and color of the rectangles. 
 */
 
int gx = 15;
int gy = 35;
float leftColor = 0.0;
float rightColor = 0.0;

void setup() {
  size(200, 200);
  colorMode(RGB, 1.0);
  noStroke();
}

void draw() {
  background(0.0);
  update(mouseX); 
  fill(0.0, leftColor + 0.4, leftColor + 0.6); 
  rect(width/4-gx, height/2-gx, gx*2, gx*2); 
  fill(0.0, rightColor + 0.2, rightColor + 0.4); 
  rect(width/1.33-gy, height/2-gy, gy*2, gy*2);
}

void update(int x) {
  leftColor = -0.002 * x/2 + 0.06;
  rightColor =  0.002 * x/2 + 0.06;
	
  gx = x/2;
  gy = 100-x/2;

  if (gx < 10) {
    gx = 10;
  } else if (gx > 90) {
    gx = 90;
  }

  if (gy > 90) {
    gy = 90;
  } else if (gy < 10) {
    gy = 10;
  }
}