press the 1 , 2 , and 3 keys keys to get to models 1 and 2. model one finds the midpoint of the pen line using the formula: m = (x1 + x2 / 2 , y1 + y2 /2). I split m into 2 variables to make things easier. the second model has one end of the pen line stuck at x: 240 y: - 180, and the other end follows the mouse. the purple dot in the middle of the line calculates the slope using the formula: m = y2 - y1 / x2 - x1. the highest slope value you can get is -0.75. the 3rd model is a sine wave adjust the alpha slider to get a different wavelength. the animated variable is just so you can see it animating or not
