pictcode

define(['sprite_manager', 'sprite_drawer'], function(spriteManager, spriteDrawer){

  var previousPosition;

  var targetSprite;

  var isMoving = false;

  var ceRatio;

  var editorSize;

  function setSwipeTarget(x, y, canvas, edtrSize, tSprite){

    previousPosition= {x:x, y:y};

    targetSprite = tSprite;

    isMoving = true;

    editorSize = edtrSize;

    ceRatio = canvas.width/editorSize.width;

  }

  function changeSpritesPositionBySwipe(x, y, drawSprites){

    if (!isMoving) {return};

    var dx = x-previousPosition.x;

    var dy = y-previousPosition.y;

    dx /= ceRatio;

    dy /= ceRatio;

    dy *= -1;

    targetSprite.position.x += dx;

    targetSprite.position.y += dy;

    previousPosition.x = x;

    previousPosition.y = y;

    if (targetSprite.x < -editorSize.width/2){

      targetSprite.x = -editorSize.width/2;

      isMoving = false;

    };

    if(targetSprite.x > editorSize.width/2){

      targetSprite.x = editorSize.width/2;

      isMoving = false;

    }; 

    if(targetSprite.y < -editorSize.height/2){

      targetSprite.y = -editorSize.height/2;

      isMoving = false;

    };

    if(targetSprite.y > editorSize.height/2) {

      targetSprite.y = editorSize.height/2

      isMoving = false;

    };

    drawSprites();

  }

  function finishSwipe(){

    isMoving = false;

  }

  return {

    setSwipeTarget:setSwipeTarget,

    changeSpritesPositionBySwipe:changeSpritesPositionBySwipe,

    finishSwipe:finishSwipe,

  };

});