text: /**
   * @license
   * Copyright 2012 Google LLC
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  /**
   * @fileoverview Generating JavaScript for colour blocks.
   * @author fraser@google.com (Neil Fraser)
   */
  'use strict';
  
  goog.provide('Blockly.JavaScript.colour');
  
  goog.require('Blockly.JavaScript');
  
  
  Blockly.JavaScript['colour_picker'] = function(block) {
    // Colour picker.
      var code = Blockly.JavaScript.quote_(block.getFieldValue('COLOUR'));
    return [code, Blockly.JavaScript.ORDER_ATOMIC];
  };
  
  Blockly.JavaScript['colour_random'] = function(block) {
    // Generate a random colour.
    var functionName = Blockly.JavaScript.provideFunction_(
        'colourRandom',
        ['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ + '() {',
          '  var num = Math.floor(Math.random() * Math.pow(2, 24));',
          '  return \'#\' + (\'00000\' + num.toString(16)).substr(-6);',
          '}']);
    var code = functionName + '()';
    return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
  };
  
  Blockly.JavaScript['colour_rgb'] = function(block) {
    // Compose a colour from RGB components expressed as percentages.
    var red = Blockly.JavaScript.valueToCode(block, 'RED',
        Blockly.JavaScript.ORDER_COMMA) || 0;
    var green = Blockly.JavaScript.valueToCode(block, 'GREEN',
        Blockly.JavaScript.ORDER_COMMA) || 0;
    var blue = Blockly.JavaScript.valueToCode(block, 'BLUE',
        Blockly.JavaScript.ORDER_COMMA) || 0;
    var functionName = Blockly.JavaScript.provideFunction_(
        'colourRgb',
        ['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
            '(r, g, b) {',
         '  r = Math.max(Math.min(Number(r), 100), 0) * 2.55;',
         '  g = Math.max(Math.min(Number(g), 100), 0) * 2.55;',
         '  b = Math.max(Math.min(Number(b), 100), 0) * 2.55;',
         '  r = (\'0\' + (Math.round(r) || 0).toString(16)).slice(-2);',
         '  g = (\'0\' + (Math.round(g) || 0).toString(16)).slice(-2);',
         '  b = (\'0\' + (Math.round(b) || 0).toString(16)).slice(-2);',
         '  return \'#\' + r + g + b;',
         '}']);
    var code = functionName + '(' + red + ', ' + green + ', ' + blue + ')';
    return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
  };
  
  Blockly.JavaScript['colour_blend'] = function(block) {
    // Blend two colours together.
    var c1 = Blockly.JavaScript.valueToCode(block, 'COLOUR1',
        Blockly.JavaScript.ORDER_COMMA) || '\'#000000\'';
    var c2 = Blockly.JavaScript.valueToCode(block, 'COLOUR2',
        Blockly.JavaScript.ORDER_COMMA) || '\'#000000\'';
    var ratio = Blockly.JavaScript.valueToCode(block, 'RATIO',
        Blockly.JavaScript.ORDER_COMMA) || 0.5;
    var functionName = Blockly.JavaScript.provideFunction_(
        'colourBlend',
        ['function ' + Blockly.JavaScript.FUNCTION_NAME_PLACEHOLDER_ +
            '(c1, c2, ratio) {',
         '  ratio = Math.max(Math.min(Number(ratio), 1), 0);',
         '  var r1 = parseInt(c1.substring(1, 3), 16);',
         '  var g1 = parseInt(c1.substring(3, 5), 16);',
         '  var b1 = parseInt(c1.substring(5, 7), 16);',
         '  var r2 = parseInt(c2.substring(1, 3), 16);',
         '  var g2 = parseInt(c2.substring(3, 5), 16);',
         '  var b2 = parseInt(c2.substring(5, 7), 16);',
         '  var r = Math.round(r1 * (1 - ratio) + r2 * ratio);',
         '  var g = Math.round(g1 * (1 - ratio) + g2 * ratio);',
         '  var b = Math.round(b1 * (1 - ratio) + b2 * ratio);',
         '  r = (\'0\' + (r || 0).toString(16)).slice(-2);',
         '  g = (\'0\' + (g || 0).toString(16)).slice(-2);',
         '  b = (\'0\' + (b || 0).toString(16)).slice(-2);',
         '  return \'#\' + r + g + b;',
         '}']);
    var code = functionName + '(' + c1 + ', ' + c2 + ', ' + ratio + ')';
    return [code, Blockly.JavaScript.ORDER_FUNCTION_CALL];
  };
  