merge

1 files changed, 178 insertions, 0 deletions

diff --git a/public/assets/javascripts/ui/lib/LabColorPicker.js b/public/assets/javascripts/ui/lib/LabColorPicker.js
new file mode 100644
index 0000000..0e1563a
--- /dev/null
+++ b/public/assets/javascripts/ui/lib/LabColorPicker.js
@@ -0,0 +1,178 @@
+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.pick( 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.pick(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]
+  }
+}