javascript - Stop a bitmap when it collides with another bitmap -

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i learning createjs , having issue game working on.

i have keyboard movement , impact detection figured out, not happens after bitmaps collide. right pass through each other, , console logs impact. want happen when player (bitmap) hits wall (bitmap), player can no longer move in direction anymore.

can help?

<script type="text/javascript">  var stage;  //big, root level container display objects  //assign keycodes readable variables var keycode_a = 65; var keycode_d = 68; var keycode_w = 87; var keycode_s = 83;  alphathreshold = 1;  function init(){     stage = new createjs.stage("mycanvas");      startgame(); }  function startgame(){     //load bitmaps     player = new createjs.bitmap("assets/player-square.jpg");     player.x = 10;     player.y = 200;     stage.addchild(player);      mazesquare = new createjs.bitmap("assets/maze-test.png");     mazesquare.x = 250;     mazesquare.y = 0;     stage.addchild(mazesquare);      //move player, listening key pressed     window.addeventlistener('keydown', keypressed, true);      stage.update(); }  function keypressed(event) {      switch(event.keycode) {         case keycode_w:             //console.log("move up");             if(player.y > 0){                 player.y -= 10;                 }             break;           case keycode_s:             //console.log("move down");             if(player.y < 430){  //stage height - square height                 player.y += 10;                 }             break;         case keycode_a:             //console.log("move left");             if(player.x > 0){  //stage height - square height                 player.x -= 10;                 }             break;         case keycode_d:             //console.log("move right");             if(player.x < 730){  //stage height - square height                 player.x += 10;                 }             break;     }      //check collisions after button press     checkcollision();      stage.update(); }  function checkcollision(keypressed) {     //collision-detection-for-easeljs     var intersection = ndgmr.checkpixelcollision(player, mazesquare, alphathreshold);      //if the intersection not empty, that's because there collision.       if (!intersection) {          console.log("no impact");        } else {           console.log("impact");        } //end else } </script>  </head>  <body onload="init();">  <center> <canvas id="mycanvas" width="800" height="500" style="border: 1px solid #000000; background-image: url(assets/grass.png);"> browser not support html5 canvas tag. </canvas> <br> w  s   d - moves player </center>


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