Hello,

in theory like the Code below.

But it doesn't look good imho because the approach just to rotate it is not optimal.

Reasons:

• 1st: one time he opens the mouth upwards, the other time downwards (looks weird).
• 2nd: when you'd give him eyes, one time they would be above the mouth (good), the other time underneath the mouth (bad)

What you want is mirror pacman on a vertical line - not possible (not in 2D, I think, in 3D you could do a rotation around Y-axis).

I recommend to program one separate version of Pacman for going right and one for going left (with different usage of arc and with eyes etc.) and have one variable (pacmanDirection) to decide where to go. Remember: You'll need goUp and goDown as well later.

Here's the not good solution with rotate:

1. int x = 300;
2. int y = 300;
3. int speed = 3;
4. int radius = 100;
5. float mouth = 3.60;
6. int myAngle = 180;
7. //
8. void setup () {
9.   size (600, 600);
10. }
11. // --------------------------------------
12. void draw () {
13.   background (0);
14.   //
    
15.   pushMatrix();
16.   translate (x, y); 
17.   rotate(radians(myAngle));
18.   fill (255, 255, 0);
19.   arc(0, 0, radius, radius, mouth, 8.90);
20.   mouth = mouth + 0.09;
21.   if (mouth > 3.60) {
22.     mouth  = mouth* -0.01;
23.   }
24.   x = x + speed ;
25.   if (x > 600 || x<0) {
26.     speed = speed * -1;
27.   }
28.   if (speed>0) {
29.     myAngle = 180;
30.   }
31.   else {
32.     myAngle = 0;
33.   }
34.   popMatrix();
35.   //
    
36. }

" What you want is mirror pacman on a vertical line - not possible (not in 2D, I think, in 3D you could do a rotation around Y-axis)."
scale(-1, 1); is the classical 2D solution...