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cockpit.js
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cockpit.js
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;(function(name, definition, global){
if (typeof define === 'function'){
define(definition);
} else {
global[name] = definition();
}
})('Cockpit', function(){
var Cockpit = function(url, timer){
this.imageUrl = url;
this.timer = timer || window;
this.setup();
};
Cockpit.prototype = {
imageUrl: null,
cockpitNode: null,
wrapperNode: null,
textNodes: null,
currentVertical: 0,
currentHorizontal: 0,
state: 'normal',
setup: function() {
this.textNodes = {};
this.setupNodes();
this.textProperty = typeof this.wrapperNode.innerText !== 'undefined' ? 'innerText' : 'textContent';
this.translateProperty = 'webkitTransform' in this.wrapperNode.style ? 'webkitTransform' : 'mozTransform'
},
setupNodes: function() {
var wrapperNode = this.wrapperNode = document.createElement('div');
var wrapperNodeStyle = wrapperNode.style;
wrapperNodeStyle.width = '100%';
wrapperNodeStyle.height = '100%';
wrapperNodeStyle.position = 'absolute';
wrapperNodeStyle.left = '0';
wrapperNodeStyle.top = '0';
wrapperNodeStyle.overflow = 'hidden';
wrapperNodeStyle.zIndex = '100000';
wrapperNodeStyle.pointerEvents = 'none';
document.body.appendChild(wrapperNode);
var cockpitNode = this.cockpitNode = document.createElement('div');
var cockpitNodeStyle = cockpitNode.style;
cockpitNodeStyle.background = 'url(' + this.imageUrl + ') center';
cockpitNodeStyle.backgroundSize = 'cover';
cockpitNodeStyle.width = '130%';
cockpitNodeStyle.height = '130%';
cockpitNodeStyle.position = 'absolute';
cockpitNodeStyle.left = '-15%';
cockpitNodeStyle.top = '-15%';
wrapperNode.appendChild(cockpitNode);
},
/**
* Moves the cockpit around.
*
* Pass two values, one for vertical movement and one for horizontal
* movement. Range for these values is from -1 (max negative movement) to
* 1 (max positive movement). 0 means no movement.
*
* @param {number} x The horizontal movement
* @param {number} y The vertical movement
*/
move: function(x, y){
if(this.currentHorizontal == x && this.currentVertical == y){
return;
}
var cockpitNodeStyle = this.cockpitNode.style;
var left = ( x * 7.5).toFixed(3) + '%';
var top = ( y * 7.5).toFixed(3) + '%';
cockpitNodeStyle[this.translateProperty] = 'translate3d(' + left + ',' + top + ',0)';
this.currentHorizontal = x;
this.currentVertical = y;
},
/**
* Creates a random position around current position
*
* @param {number} current The current position value
* @param {number} intensity Thr random intensity, from 0 to 1, where 0
* equals no randomization and 1 equals full randomization
*/
getRandomPosition: function(current, intensity){
return Math.max(Math.min((( Math.random() - 0.5 ) * intensity * 0.5) + current, 1.5), -1.5);
},
/**
* Shakes the cockpit.
*
* You can pass an optional intensity value from 0 to 1 (defaults to 0.5)
* and and optional duration value (defaults to 300).
*
* @param {number} [intensity] The shake intensity from 0 to 1
* @param {number} [duration] The shake duration in ms
*/
shake: function(intensity, duration){
if(this.state === 'shake'){
return;
}
intensity = intensity || 0.5;
duration = duration || 300;
this.timer.setTimeout(this.endShake.bind(this), duration);
this.beginShake(intensity);
},
/**
* Starts to shake the cockpit
*
* The cockpit will shake until endShake() is called.
*
* @param {number} [intensity] The shake intensity from 0 to 1
*/
beginShake: function(intensity){
if(this.state === 'shake'){
return;
}
this.state = 'shake';
intensity = intensity || 0.5;
var interval;
interval = this.timer.setInterval(function(){
if (this.state !== 'shake') {
this.timer.clearInterval(interval);
return;
}
this.move(this.getRandomPosition(this.currentHorizontal, intensity), this.getRandomPosition(this.currentVertical, intensity));
}.bind(this), 50);
},
/**
* Ends the shaking started with beginShake()
*
*/
endShake: function(){
this.state = 'normal';
},
/**
* Vibrates the cockpit for a set duration
*
* You can pass an optional duration value.
*
* @param {number} [duration] The vibration duration
*/
vibrate: function(duration){
if(this.state === 'vibrate'){
return;
}
duration = duration || 600;
setTimeout(this.endVibrate.bind(this), duration);
this.beginVibrate();
},
/**
* Starts to vibrate the cockpit
*
* The cockpit will vibrate until endVibrate() is called
*/
beginVibrate: function(){
if(this.state === 'vibrate'){
return;
}
this.state = 'vibrate';
var direction = 1;
var interval;
interval = this.timer.setInterval(function(){
if (this.state !== 'vibrate') {
this.timer.clearInterval(interval);
return;
}
direction *= -1;
var modificator = 0.01 * direction;
this.move(this.currentHorizontal + modificator, this.currentVertical + modificator);
}.bind(this), 30);
},
/**
* Ends the vibration started by beginVibrate()
*
*/
endVibrate: function(){
this.state = 'normal';
},
/**
* Sets the state of the cockpit
*
* Will also end previous states if differs from current.
*
* This can be used instead of the begin/end methods.
*
* @param {string} state The new state to set, can be one of 'vibrate',
* 'shake' or 'normal'
*/
setState: function(state){
if(this.state === state){
return;
}
switch(state){
case 'vibrate':
this.beginVibrate();
break;
case 'shake':
this.beginShake();
break;
default:
this.state = 'normal';
break;
}
},
/**
* Adds a text item to the cockpit overlay
*
* @param {string} id An identifier for this text item
* @param {sring} initialValue An initial value to be displayed
*/
addText: function(id, initialValue){
var node = document.createElement('span');
node[this.textProperty] = initialValue;
node.id = id;
node.className = 'cockpit-text';
this.cockpitNode.appendChild(node);
this.textNodes[id] = {
node: node,
value: initialValue
};
},
/**
* Updates a text item
*
* @param {string} id The identifier of this text item
* @param {string} value The value to be displayed
*/
updateText: function(id, value){
var textItem = this.textNodes[id];
if(textItem.value !== value){
textItem.node[this.textProperty] = value;
}
}
};
return Cockpit;
}, this);