constrain()

Constrains a value to not exceed a maximum and minimum value.

• void draw() 
  { 
   background(204);
   float mx = constrain(mouseX, 30, 70);
   rect(mx-10, 40, 20, 20);
  }
  

• constrain(amt, low, high)

• amt(float, int)the value to constrain
• low(float, int)minimum limit
• high(float, int)maximum limit

• float or int

• max()
• min()