Dave Drohan (SETU)

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Mouse Example 3.7

In this step, we will implement an example from your lecture.

• If the LEFT button on the mouse is pressed, set the fill to black and draw a square. As soon as the LEFT button is released, gray fill the square.

• If the RIGHT button on the mouse is pressed, set the fill to white and draw a square. As soon as the RIGHT button is released, gray fill the square.

• If no mouse button is pressed, set the fill to gray and draw a square.

Mouse Example 3.7

Create a new Processing sketch in your workspace and call it Example_3_7.

Enter the following code into your sketchbook (avoid the temptation to copy and paste it…you learn more by writing the code out):

void setup() {
  size(100,100);
}

void draw() { 
   if (mousePressed){
       if (mouseButton == LEFT) 
            fill(0);      // black
       else if (mouseButton == RIGHT)
            fill(255);    // white
   }        
   else { 
       fill(126);     // gray
    }
    rect(25, 25, 50, 50);
}

• Run your code. Does it work as you would expect?