diff --git a/oop/script.js b/oop/script.js
index 3f0d8d7..6854fd1 100644
--- a/oop/script.js
+++ b/oop/script.js
@@ -32,12 +32,18 @@ class Boule {
     this.size = s
     this.vx = -2+Math.random()*4;
     this.vy = -2+Math.random()*4;
+    // this.color = 'hsl(360, 50%, 50%)'
+    this.color = {
+      h:360,
+      s:50,
+      l:50
+    }
   }
 
   draw(){
     // console.log('draw', this);
     ctx.beginPath();
-    ctx.fillStyle = 'red';
+    ctx.fillStyle = `hsl(${this.color.h},${this.color.s}%,${this.color.l}%)`;
     ctx.arc(this.pos.x, this.pos.y, this.size, 0, 2 * Math.PI);
     // ctx.fillRect(300, 300, 100, 100);
     ctx.fill();
@@ -46,6 +52,14 @@ class Boule {
   move(){
     this.pos.x += this.vx;
     this.pos.y += this.vy;
+
+    if(this.pos.x >= canvas.width || this.pos.x <= 0){
+      this.vx *= -1;
+    }
+    if(this.pos.y >= canvas.height || this.pos.y <= 0){
+      this.vy *= -1;
+    }
+
     this.draw();
   }
 }
@@ -55,25 +69,87 @@ class Boule {
 
 let boules = [];
 let maboule;
-for (let index = 0; index < 10000; index++) {
+function createBoule(){
   maboule = new Boule(
-    Math.random()*canvas.width, 
-    Math.random()*canvas.height,
+    canvas.width / 2, // Math.random()*canvas.width, 
+    canvas.height / 2, // Math.random()*canvas.height,
     2+Math.random()*10
   );
   maboule.draw();
   boules.push(maboule);
-  
 }
 
+// for (let index = 0; index < 10000; index++) {
+  // createBoule();  
+// }
+
+setInterval(()=>{
+  createBoule();
+}, 1000)
 
 let anime = () => {
   ctx.clearRect(0,0, canvas.width, canvas.height)
-  boules.forEach((boule) => {
-    boule.move();
+  // boules.forEach((boule_a) => {
+  for (let i = 0; i < boules.length; i++) {
+    let boule_a = boules[i];
+    for (let j = i+1; j < boules.length; j++) {
+      let boule_b = boules[j];
+      // distance entre les centre des boules
+      let dist = Math.sqrt(
+        Math.pow(boule_b.pos.x - boule_a.pos.x, 2) + 
+        Math.pow(boule_b.pos.y - boule_a.pos.y, 2)
+      );
+      // console.log('dist', dist);
+      
+      if(dist < boule_a.size+boule_b.size){
+        // console.log('ça touche');
+        
+        // distance inferieure a la somme des deux rayons
+        // ça touche
+        // boule_a.vx *= -1;
+        // boule_a.vy *= -1;
+        // boule_b.vx *= -1;
+        // boule_b.vy *= -1;
 
-  })
+        nx = (boule_b.pos.x - boule_a.pos.x)/dist;
+        ny = (boule_b.pos.y - boule_a.pos.y)/dist;
+
+        vA_n = boule_a.vx*nx + boule_a.vy*ny
+        vB_n = boule_b.vx*nx + boule_b.vy*ny
+
+        boule_a.vx +=  (vB_n - vA_n) * nx
+        boule_a.vy += (vB_n - vA_n) * ny
+        boule_b.vx += (vA_n - vB_n) * nx
+        boule_b.vy += (vA_n - vB_n) * ny
+        boule_a.move();
+        boule_b.move();
+      }
+    }
+    boule_a.move();
+  }
+
+
+  
   window.requestAnimationFrame(anime);  
 }
 
-window.requestAnimationFrame(anime);
\ No newline at end of file
+window.requestAnimationFrame(anime);
+
+
+let onMouseMove = (event) => {
+  // console.log('event', event);
+  // h 0 -> 360
+  // x 0 -> canvas.width
+  let h = 360 * (event.x / canvas.width);
+  // console.log('h', h);
+  
+  let s = 100 * (event.y / canvas.height)
+  console.log('s', s);
+  
+  boules.forEach(boule => {
+    boule.color.h = h;
+    boule.color.s = s;
+  });
+}
+
+window.addEventListener('mousemove', onMouseMove);
\ No newline at end of file