topical media & game development
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graphic-processing-site-examples-Basics-Input-Constrain-Constrain.pde / pde
Constrain. Move the mouse across the screen to move the circle. The program constrains the circle to its box. 

  
   
  float mx;
  float my;
  float easing = 0.05;
  float esize = 25.0;
  int box = 30;
  
  void setup() 
  {
    size(200, 200);
    noStroke(); 
    smooth();
    ellipseMode(CENTER_RADIUS);  
  }
  
  void draw() 
  { 
    background(51);
    
    if(abs(mouseX - mx) > 0.1) {
      mx = mx + (mouseX - mx) * easing;
    }
    if(abs(mouseY - my) > 0.1) {
      my = my + (mouseY- my) * easing;
    }
    
    float distance = esize * 2;
    mx = constrain(mx, box+distance, width-box-distance);
    my = constrain(my, box+distance, height-box-distance);
    fill(76);
    rect(box+esize, box+esize, box*3, box*3);
    fill(255);  
    ellipse(mx, my, esize, esize);
  }
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 20/2/2008

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