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var WallpaperPicker = View.extend({
el: ".wallpaper",
events: {
"click .swatch": 'pick',
},
initialize: function(){
var wm = new WallpaperManager()
app.on('wallpaper-ready', function(){
var black = [0,0,0,1.0]
var white = [255,255,255,1.0]
var swatches = wm.buildSwatches(black, white, 2)
swatches.forEach(function(swatch){
var dataUrl = swatch.toDataURL()
var span = document.createElement('span')
span.style.backgroundImage = "url(" + dataUrl + ")"
span.className = "swatch"
this.$el.append(span)
}.bind(this))
}.bind(this))
wm.init()
},
toggle: function(state){
this.$el.toggleClass("active", state);
// toggle the class that makes the cursor a paintbucket
// $("body").removeClass("pastePaper");
},
show: function(){
this.toggle(true)
},
hide: function(){
this.toggle(false)
},
pick: function(e){
var $swatch = $(e.currentTarget)
var $floatingSwatch = $(".floatingSwatch")
$floatingSwatch.css('background-image', $swatch.css('background-image'))
Scenery.nextWallpaper = $swatch.css('background-image')
setTimeout(function(){
function _followCursor(e) {
$floatingSwatch.css({
top: (e.pageY + 10) + 'px',
left: (e.pageX + 10) + 'px'
});
}
$(window).on('mousemove', _followCursor);
$(window).one('click', function () {
$(window).off('mousemove', _followCursor);
$floatingSwatch.hide();
});
$floatingSwatch.show()
_followCursor(e);
})
}
})
// pattern
// scale
// foreground
// background
var WallpaperManager = function () {
var image = new Image ()
var imageData
var w, h
this.masks = []
this.init = function(){
this.load()
}
this.load = function(){
image.onload = function(){
this.loadImageData()
this.buildMasks()
app.tube('wallpaper-ready')
}.bind(this)
image.src = "/assets/img/palette.gif"
}
this.loadImageData = function(){
var canvas = document.createElement('canvas')
var ctx = canvas.getContext('2d')
w = canvas.width = image.naturalWidth
h = canvas.height = image.naturalHeight
ctx.drawImage(image, 0,0)
imageData = ctx.getImageData(0,0,image.naturalWidth,image.naturalHeight).data
}
this.buildMasks = function(){
var mask
for (var y = 0; y < 6; y++) {
for (var x = 0; x < 16; x++) {
mask = this.buildMask(x,y)
this.masks.push(mask)
}
}
}
this.buildMask = function(x,y){
// add the offset of the top-left swatch
x = (x * 18) + 15
y = (y * 16) + 5
var mask = new Array(64)
var t = 0
for (var i = 0; i < 8; i++) {
for (var j = 0; j < 8; j++) {
t = ( w*(y+j) + x+i ) * 4
mask[j*8+i] = imageData[t] === 0
}
}
return mask
}
this.buildSwatches = function(black, white, scale) {
var swatches = this.masks.map(function(mask){
return this.buildSwatch(mask,black,white,scale)
}.bind(this))
return swatches
}
this.buildSwatch = function(mask,black,white,scale){
black = 'rgba(' + black.join(',') + ')'
white = 'rgba(' + white.join(',') + ')'
var canvas = document.createElement("canvas")
canvas.width = 8*scale
canvas.height = 8*scale
var ctx = canvas.getContext('2d')
for (var i = 0; i < 8; i++) {
for (var j = 0; j < 8; j++) {
ctx.fillStyle = mask[j*8+i] ? black : white
ctx.fillRect(i*scale, j*scale, scale, scale)
}
}
return canvas
}
}
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