var Class = require('../utils/Class'); 
var GetValue = require('../utils/object/GetValue'); 
var KeyControl = new Class({ 
initialize: function KeyControl(config){ 
this.camera = GetValue(config, 'camera', null ); 
this.left = GetValue(config, 'left', null ); 
this.right = GetValue(config, 'right', null ); 
this.up = GetValue(config, 'up', null ); 
this.down = GetValue(config, 'down', null ); 
var speed = GetValue(config, 'speed', null ); 
if (typeof speed === 'number') { 
this.speedX = speed; 
this.speedY = speed; 
} 
 else { 
this.speedX = GetValue(config, 'speed.x', 0); 
this.speedY = GetValue(config, 'speed.y', 0); 
} 
this.active = (this.camera !== null ); 
} 
,
start: function (){ 
this.active = (this.camera !== null ); 
} 
,
stop: function (){ 
this.active = false ; 
} 
,
update: function (delta){ 
if (!this.active) { 
return ; 
} 
if (delta === undefined) { 
delta = 1; 
} 
var cam = this.camera; 
if (this.up && this.up.isDown) { 
cam.scrollY -= ((this.speedY * delta) | 0); 
} 
 else if (this.down && this.down.isDown) { 
cam.scrollY += ((this.speedY * delta) | 0); 
} 
if (this.left && this.left.isDown) { 
cam.scrollX -= ((this.speedX * delta) | 0); 
} 
 else if (this.right && this.right.isDown) { 
cam.scrollX += ((this.speedX * delta) | 0); 
} 
} 
,
destroy: function (){ 
this.camera = null ; 
this.left = null ; 
this.right = null ; 
this.up = null ; 
this.down = null ; 
} 
}
); 
module.exports = KeyControl;