Hi!
I need your help.

I created this code:

1.     void setup() { 
           size(400, 400); 
           smooth();         
       } 
    
       void draw() { 
           background(255);
        
         float mX = mouseX;
         float mY = mouseY; 
        
         fill (#F7C502);
         rect (0, 0, mX, mY);
   
            for (int y = 0; y < mouseY; y = y + 5) { 
               line(0, y, width, y); 
       }  
             for (int x = 0; x < mouseX; x = x + 5) { 
               line(x, 0, x, height); 
       }  
   
   }
   

I have the plan that my rect (filled with #F7C502) fits in my mouseX/Y-grid.
So i have to tell my rect that it should only work if mouseX or mouseY is divisible by 5.
If the coordinate – for example 23 – isnt divisible by 5, the rect should go back to 20.
Can you tell me how to code this or is there a better way to get to my aim?
Thx!