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var LabColorPicker = function (parent, w, h) {
var base = this
var canvas = this.canvas = document.createElement('canvas')
var ctx = this.ctx = canvas.getContext('2d')
var imageData = ctx.createImageData(w,h)
var data = imageData.data
var cursor = this.cursor = document.createElement("div")
cursor.className = "colorPickerCursor"
var brightnessControl = this.brightness = document.createElement("input")
var $brightnessControl = $(brightnessControl)
brightnessControl.setAttribute("type", "range")
brightnessControl.setAttribute("min", "0")
brightnessControl.setAttribute("max", "110")
brightnessControl.setAttribute("value", "0")
canvas.width = w
canvas.height = h
canvas.className = "colorPicker"
var ww = w-1
var hh = h-1
var L_range = [0, 110]
var a_range = [-86.185, 98.254]
var b_range = [-107.863, 94.482]
var rgb = [0,0,0]
var val = 80
this.mouse = new mouse({
el: canvas,
down: function(e, cursor){
parent.begin()
cursor.x.a = -cursor.x.a
base.pick(cursor.x.a, cursor.y.a)
},
drag: function(e, cursor){
cursor.x.b = -cursor.x.b
base.pick(cursor.x.b, cursor.y.b)
},
up: function(){
parent.finalize()
}
})
$brightnessControl.on({
"mousedown": function(){ base.beginBrightness() },
"input": function(){ base.updateBrightness() },
})
this.setLab = function(Lab) {
val = Lab[0]
this.paint()
var rgb = xyz2rgb(hunterlab2xyz(Lab[0], Lab[1], Lab[2])).map(Math.round)
return rgb
}
this.pick = function(i, j){
i = clamp(i, 0, w)
j = clamp(j, 0, h)
var x = mix( i/ww, a_range[0], a_range[1] )
var y = mix( j/hh, b_range[0], b_range[1] )
var rgb = xyz2rgb(hunterlab2xyz(val, x, y)).map(Math.round)
this.moveCursor(i, j)
parent.pickColor( rgb, [val,x,y] )
}
this.load = function(rgba){
var Lab = xyz2hunterlab(rgb2xyz(rgba))
var val = clamp( Lab[0], L_range[0], L_range[1] )
var x = mix( norm(Lab[1], a_range[0], a_range[1]), 0, ww )
var y = mix( norm(Lab[2], b_range[0], b_range[1]), 0, hh )
this.moveCursor(x,y)
this.setLab(Lab)
this.setBrightness(Lab)
return Lab
}
this.moveCursor = function(x,y){
cursor.style.left = x + "px"
cursor.style.top = y + "px"
}
this.paint = function() {
val = clamp(val, L_range[0], L_range[1])
var x, y, t
for (var i = 0; i < w; i++) {
for (var j = 0; j < h; j++) {
x = mix( i/ww, a_range[0], a_range[1] )
y = mix( j/hh, b_range[0], b_range[1] )
t = (j*w + i) * 4
rgb = xyz2rgb(hunterlab2xyz(val, x, y))
data[t] = Math.round( rgb[0] )
data[t+1] = Math.round( rgb[1] )
data[t+2] = Math.round( rgb[2] )
data[t+3] = 255
}
}
ctx.putImageData(imageData,0,0)
}
this.beginBrightness = function(){
parent.begin()
$(window).one("mouseup", parent.finalize.bind(parent))
}
this.updateBrightness = function(){
parent.labColor[0] = parseFloat( $brightnessControl.val() )
var rgb = base.setLab( parent.labColor )
parent.pickColor(rgb, parent.labColor)
}
this.setBrightness = function(Lab){
$brightnessControl.val(Lab[0])
}
function hunterlab2xyz (L,a,b) {
var_Y = L / 10
var_X = a / 17.5 * L / 10
var_Z = b / 7 * L / 10
Y = Math.pow(var_Y, 2)
X = ( var_X + Y ) / 1.02
Z = -( var_Z - Y ) / 0.847
xyz = [X,Y,Z]
}
function xyz2rgb(){
var var_X = xyz[0] / 100 //X from 0 to 95.047 (Observer = 2°, Illuminant = D65)
var var_Y = xyz[1] / 100 //Y from 0 to 100.000
var var_Z = xyz[2] / 100 //Z from 0 to 108.883
var_R = var_X * 3.2406 + var_Y * -1.5372 + var_Z * -0.4986
var_G = var_X * -0.9689 + var_Y * 1.8758 + var_Z * 0.0415
var_B = var_X * 0.0557 + var_Y * -0.2040 + var_Z * 1.0570
if ( var_R > 0.0031308 ) var_R = 1.055 * Math.pow( var_R, 1 / 2.4 ) - 0.055
else var_R = 12.92 * var_R
if ( var_G > 0.0031308 ) var_G = 1.055 * Math.pow( var_G, 1 / 2.4 ) - 0.055
else var_G = 12.92 * var_G
if ( var_B > 0.0031308 ) var_B = 1.055 * Math.pow( var_B, 1 / 2.4 ) - 0.055
else var_B = 12.92 * var_B
rgb[0] = clamp(var_R * 255, 0, 255)
rgb[1] = clamp(var_G * 255, 0, 255)
rgb[2] = clamp(var_B * 255, 0, 255)
return rgb
}
function rgb2xyz(RGB){
var var_R = ( RGB[0] / 255 ) // R from 0 to 255
var var_G = ( RGB[1] / 255 ) // G from 0 to 255
var var_B = ( RGB[2] / 255 ) // B from 0 to 255
if ( var_R > 0.04045 ) var_R = Math.pow( ( var_R + 0.055 ) / 1.055, 2.4)
else var_R = var_R / 12.92
if ( var_G > 0.04045 ) var_G = Math.pow( ( var_G + 0.055 ) / 1.055, 2.4)
else var_G = var_G / 12.92
if ( var_B > 0.04045 ) var_B = Math.pow( ( var_B + 0.055 ) / 1.055, 2.4)
else var_B = var_B / 12.92
var_R = var_R * 100
var_G = var_G * 100
var_B = var_B * 100
//Observer. = 2°, Illuminant = D65
var x = var_R * 0.4124 + var_G * 0.3576 + var_B * 0.1805
var y = var_R * 0.2126 + var_G * 0.7152 + var_B * 0.0722
var z = var_R * 0.0193 + var_G * 0.1192 + var_B * 0.9505
return [x,y,z]
}
function xyz2hunterlab (XYZ) {
var X = XYZ[0]
var Y = XYZ[1] || 1e-6 // otherwise divide-by-zero error when converting rgb(0,0,0)
var Z = XYZ[2]
var L = 10 * sqrt( Y )
var a = 17.5 * ( ( ( 1.02 * X ) - Y ) / sqrt( Y ) )
var b = 7 * ( ( Y - ( 0.847 * Z ) ) / sqrt( Y ) )
return [L,a,b]
}
}
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