lib/paintweb/docs/api-ref/symbols/src/src_tools_pencil.js.html

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   2         .KEYW {color: #933;}
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   8         </style></head><body><pre><span class='line'>  1</span> <span class="COMM">/*
   9 <span class='line'>  2</span>  * Copyright (C) 2008, 2009 Mihai Şucan
  10 <span class='line'>  3</span>  *
  11 <span class='line'>  4</span>  * This file is part of PaintWeb.
  12 <span class='line'>  5</span>  *
  13 <span class='line'>  6</span>  * PaintWeb is free software: you can redistribute it and/or modify
  14 <span class='line'>  7</span>  * it under the terms of the GNU General Public License as published by
  15 <span class='line'>  8</span>  * the Free Software Foundation, either version 3 of the License, or
  16 <span class='line'>  9</span>  * (at your option) any later version.
  17 <span class='line'> 10</span>  *
  18 <span class='line'> 11</span>  * PaintWeb is distributed in the hope that it will be useful,
  19 <span class='line'> 12</span>  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 <span class='line'> 13</span>  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 <span class='line'> 14</span>  * GNU General Public License for more details.
  22 <span class='line'> 15</span>  *
  23 <span class='line'> 16</span>  * You should have received a copy of the GNU General Public License
  24 <span class='line'> 17</span>  * along with PaintWeb.  If not, see &lt;http://www.gnu.org/licenses/>.
  25 <span class='line'> 18</span>  *
  26 <span class='line'> 19</span>  * $URL: http://code.google.com/p/paintweb $
  27 <span class='line'> 20</span>  * $Date: 2009-06-15 15:25:29 +0300 $
  28 <span class='line'> 21</span>  */</span><span class="WHIT">
  29 <span class='line'> 22</span>
  30 <span class='line'> 23</span> </span><span class="COMM">/**
  31 <span class='line'> 24</span>  * @author &lt;a lang="ro" href="http://www.robodesign.ro/mihai">Mihai Şucan&lt;/a>
  32 <span class='line'> 25</span>  * @fileOverview Holds the pencil tool implementation.
  33 <span class='line'> 26</span>  */</span><span class="WHIT">
  34 <span class='line'> 27</span>
  35 <span class='line'> 28</span> </span><span class="COMM">/**
  36 <span class='line'> 29</span>  * @class The drawing pencil.
  37 <span class='line'> 30</span>  *
  38 <span class='line'> 31</span>  * @param {PaintWeb} app Reference to the main paint application object.
  39 <span class='line'> 32</span>  */</span><span class="WHIT">
  40 <span class='line'> 33</span> </span><span class="NAME">pwlib.tools.pencil</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">function</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="NAME">app</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
  41 <span class='line'> 34</span> </span><span class="WHIT">  </span><span class="KEYW">var</span><span class="WHIT"> </span><span class="NAME">_self</span><span class="WHIT">         </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">this</span><span class="PUNC">,</span><span class="WHIT">
  42 <span class='line'> 35</span> </span><span class="WHIT">      </span><span class="NAME">clearInterval</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">app.win.clearInterval</span><span class="PUNC">,</span><span class="WHIT">
  43 <span class='line'> 36</span> </span><span class="WHIT">      </span><span class="NAME">context</span><span class="WHIT">       </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">app.buffer.context</span><span class="PUNC">,</span><span class="WHIT">
  44 <span class='line'> 37</span> </span><span class="WHIT">      </span><span class="NAME">image</span><span class="WHIT">         </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">app.image</span><span class="PUNC">,</span><span class="WHIT">
  45 <span class='line'> 38</span> </span><span class="WHIT">      </span><span class="NAME">mouse</span><span class="WHIT">         </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">app.mouse</span><span class="PUNC">,</span><span class="WHIT">
  46 <span class='line'> 39</span> </span><span class="WHIT">      </span><span class="NAME">setInterval</span><span class="WHIT">   </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">app.win.setInterval</span><span class="PUNC">;</span><span class="WHIT">
  47 <span class='line'> 40</span>
  48 <span class='line'> 41</span> </span><span class="WHIT">  </span><span class="COMM">/**
  49 <span class='line'> 42</span>    * The interval ID used for running the pencil drawing operation every few
  50 <span class='line'> 43</span>    * milliseconds.
  51 <span class='line'> 44</span>    *
  52 <span class='line'> 45</span>    * @private
  53 <span class='line'> 46</span>    * @see PaintWeb.config.toolDrawDelay
  54 <span class='line'> 47</span>    */</span><span class="WHIT">
  55 <span class='line'> 48</span> </span><span class="WHIT">  </span><span class="KEYW">var</span><span class="WHIT"> </span><span class="NAME">timer</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">null</span><span class="PUNC">;</span><span class="WHIT">
  56 <span class='line'> 49</span>
  57 <span class='line'> 50</span> </span><span class="WHIT">  </span><span class="COMM">/**
  58 <span class='line'> 51</span>    * Holds the points needed to be drawn. Each point is added by the
  59 <span class='line'> 52</span>    * &lt;code>mousemove&lt;/code> event handler.
  60 <span class='line'> 53</span>    *
  61 <span class='line'> 54</span>    * @private
  62 <span class='line'> 55</span>    * @type Array
  63 <span class='line'> 56</span>    */</span><span class="WHIT">
  64 <span class='line'> 57</span> </span><span class="WHIT">  </span><span class="KEYW">var</span><span class="WHIT"> </span><span class="NAME">points</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="PUNC">[</span><span class="PUNC">]</span><span class="PUNC">;</span><span class="WHIT">
  65 <span class='line'> 58</span>
  66 <span class='line'> 59</span> </span><span class="WHIT">  </span><span class="COMM">/**
  67 <span class='line'> 60</span>    * Holds the last point on the &lt;var>x&lt;/var> axis of the image, for the current
  68 <span class='line'> 61</span>    * drawing operation.
  69 <span class='line'> 62</span>    *
  70 <span class='line'> 63</span>    * @private
  71 <span class='line'> 64</span>    * @type Number
  72 <span class='line'> 65</span>    */</span><span class="WHIT">
  73 <span class='line'> 66</span> </span><span class="WHIT">  </span><span class="KEYW">var</span><span class="WHIT"> </span><span class="NAME">x0</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NUMB">0</span><span class="PUNC">;</span><span class="WHIT">
  74 <span class='line'> 67</span>
  75 <span class='line'> 68</span> </span><span class="WHIT">  </span><span class="COMM">/**
  76 <span class='line'> 69</span>    * Holds the last point on the &lt;var>y&lt;/var> axis of the image, for the current
  77 <span class='line'> 70</span>    * drawing operation.
  78 <span class='line'> 71</span>    *
  79 <span class='line'> 72</span>    * @private
  80 <span class='line'> 73</span>    * @type Number
  81 <span class='line'> 74</span>    */</span><span class="WHIT">
  82 <span class='line'> 75</span> </span><span class="WHIT">  </span><span class="KEYW">var</span><span class="WHIT"> </span><span class="NAME">y0</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NUMB">0</span><span class="PUNC">;</span><span class="WHIT">
  83 <span class='line'> 76</span>
  84 <span class='line'> 77</span> </span><span class="WHIT">  </span><span class="COMM">/**
  85 <span class='line'> 78</span>    * Tool deactivation event handler.
  86 <span class='line'> 79</span>    */</span><span class="WHIT">
  87 <span class='line'> 80</span> </span><span class="WHIT">  </span><span class="NAME">this.deactivate</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">function</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
  88 <span class='line'> 81</span> </span><span class="WHIT">    </span><span class="KEYW">if</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="NAME">timer</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
  89 <span class='line'> 82</span> </span><span class="WHIT">      </span><span class="NAME">clearInterval</span><span class="PUNC">(</span><span class="NAME">timer</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
  90 <span class='line'> 83</span> </span><span class="WHIT">      </span><span class="NAME">timer</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">null</span><span class="PUNC">;</span><span class="WHIT">
  91 <span class='line'> 84</span> </span><span class="WHIT">    </span><span class="PUNC">}</span><span class="WHIT">
  92 <span class='line'> 85</span>
  93 <span class='line'> 86</span> </span><span class="WHIT">    </span><span class="KEYW">if</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="NAME">mouse.buttonDown</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
  94 <span class='line'> 87</span> </span><span class="WHIT">      </span><span class="NAME">context.clearRect</span><span class="PUNC">(</span><span class="NUMB">0</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NUMB">0</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">image.width</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">image.height</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
  95 <span class='line'> 88</span> </span><span class="WHIT">    </span><span class="PUNC">}</span><span class="WHIT">
  96 <span class='line'> 89</span>
  97 <span class='line'> 90</span> </span><span class="WHIT">    </span><span class="NAME">points</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="PUNC">[</span><span class="PUNC">]</span><span class="PUNC">;</span><span class="WHIT">
  98 <span class='line'> 91</span> </span><span class="WHIT">  </span><span class="PUNC">}</span><span class="PUNC">;</span><span class="WHIT">
  99 <span class='line'> 92</span>
 100 <span class='line'> 93</span> </span><span class="WHIT">  </span><span class="COMM">/**
 101 <span class='line'> 94</span>    * Initialize the drawing operation.
 102 <span class='line'> 95</span>    */</span><span class="WHIT">
 103 <span class='line'> 96</span> </span><span class="WHIT">  </span><span class="NAME">this.mousedown</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">function</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
 104 <span class='line'> 97</span> </span><span class="WHIT">    </span><span class="NAME">x0</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">mouse.x</span><span class="PUNC">;</span><span class="WHIT">
 105 <span class='line'> 98</span> </span><span class="WHIT">    </span><span class="NAME">y0</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">mouse.y</span><span class="PUNC">;</span><span class="WHIT">
 106 <span class='line'> 99</span>
 107 <span class='line'>100</span> </span><span class="WHIT">    </span><span class="NAME">points</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="PUNC">[</span><span class="PUNC">]</span><span class="PUNC">;</span><span class="WHIT">
 108 <span class='line'>101</span> </span><span class="WHIT">    </span><span class="KEYW">if</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="PUNC">!</span><span class="NAME">timer</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
 109 <span class='line'>102</span> </span><span class="WHIT">      </span><span class="NAME">timer</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">setInterval</span><span class="PUNC">(</span><span class="NAME">_self.draw</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">app.config.toolDrawDelay</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
 110 <span class='line'>103</span> </span><span class="WHIT">    </span><span class="PUNC">}</span><span class="WHIT">
 111 <span class='line'>104</span>
 112 <span class='line'>105</span> </span><span class="WHIT">    </span><span class="KEYW">return</span><span class="WHIT"> </span><span class="KEYW">true</span><span class="PUNC">;</span><span class="WHIT">
 113 <span class='line'>106</span> </span><span class="WHIT">  </span><span class="PUNC">}</span><span class="PUNC">;</span><span class="WHIT">
 114 <span class='line'>107</span>
 115 <span class='line'>108</span> </span><span class="WHIT">  </span><span class="COMM">/**
 116 <span class='line'>109</span>    * Save the mouse coordinates in the array.
 117 <span class='line'>110</span>    */</span><span class="WHIT">
 118 <span class='line'>111</span> </span><span class="WHIT">  </span><span class="NAME">this.mousemove</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">function</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
 119 <span class='line'>112</span> </span><span class="WHIT">    </span><span class="KEYW">if</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="NAME">mouse.buttonDown</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
 120 <span class='line'>113</span> </span><span class="WHIT">      </span><span class="NAME">points.push</span><span class="PUNC">(</span><span class="NAME">mouse.x</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">mouse.y</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
 121 <span class='line'>114</span> </span><span class="WHIT">    </span><span class="PUNC">}</span><span class="WHIT">
 122 <span class='line'>115</span> </span><span class="WHIT">  </span><span class="PUNC">}</span><span class="PUNC">;</span><span class="WHIT">
 123 <span class='line'>116</span>
 124 <span class='line'>117</span> </span><span class="WHIT">  </span><span class="COMM">/**
 125 <span class='line'>118</span>    * Draw the points in the stack. This function is called every few
 126 <span class='line'>119</span>    * milliseconds.
 127 <span class='line'>120</span>    *
 128 <span class='line'>121</span>    * @see PaintWeb.config.toolDrawDelay
 129 <span class='line'>122</span>    */</span><span class="WHIT">
 130 <span class='line'>123</span> </span><span class="WHIT">  </span><span class="NAME">this.draw</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">function</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
 131 <span class='line'>124</span> </span><span class="WHIT">    </span><span class="KEYW">var</span><span class="WHIT"> </span><span class="NAME">i</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NUMB">0</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">n</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">points.length</span><span class="PUNC">;</span><span class="WHIT">
 132 <span class='line'>125</span> </span><span class="WHIT">    </span><span class="KEYW">if</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="PUNC">!</span><span class="NAME">n</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
 133 <span class='line'>126</span> </span><span class="WHIT">      </span><span class="KEYW">return</span><span class="PUNC">;</span><span class="WHIT">
 134 <span class='line'>127</span> </span><span class="WHIT">    </span><span class="PUNC">}</span><span class="WHIT">
 135 <span class='line'>128</span>
 136 <span class='line'>129</span> </span><span class="WHIT">    </span><span class="NAME">context.beginPath</span><span class="PUNC">(</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
 137 <span class='line'>130</span> </span><span class="WHIT">    </span><span class="NAME">context.moveTo</span><span class="PUNC">(</span><span class="NAME">x0</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">y0</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
 138 <span class='line'>131</span>
 139 <span class='line'>132</span> </span><span class="WHIT">    </span><span class="KEYW">while</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="NAME">i</span><span class="WHIT"> </span><span class="PUNC">&lt;</span><span class="WHIT"> </span><span class="NAME">n</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
 140 <span class='line'>133</span> </span><span class="WHIT">      </span><span class="NAME">x0</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">points</span><span class="PUNC">[</span><span class="NAME">i</span><span class="PUNC">++</span><span class="PUNC">]</span><span class="PUNC">;</span><span class="WHIT">
 141 <span class='line'>134</span> </span><span class="WHIT">      </span><span class="NAME">y0</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="NAME">points</span><span class="PUNC">[</span><span class="NAME">i</span><span class="PUNC">++</span><span class="PUNC">]</span><span class="PUNC">;</span><span class="WHIT">
 142 <span class='line'>135</span> </span><span class="WHIT">      </span><span class="NAME">context.lineTo</span><span class="PUNC">(</span><span class="NAME">x0</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">y0</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
 143 <span class='line'>136</span> </span><span class="WHIT">    </span><span class="PUNC">}</span><span class="WHIT">
 144 <span class='line'>137</span>
 145 <span class='line'>138</span> </span><span class="WHIT">    </span><span class="NAME">context.stroke</span><span class="PUNC">(</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
 146 <span class='line'>139</span> </span><span class="WHIT">    </span><span class="NAME">context.closePath</span><span class="PUNC">(</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
 147 <span class='line'>140</span>
 148 <span class='line'>141</span> </span><span class="WHIT">    </span><span class="NAME">points</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="PUNC">[</span><span class="PUNC">]</span><span class="PUNC">;</span><span class="WHIT">
 149 <span class='line'>142</span> </span><span class="WHIT">  </span><span class="PUNC">}</span><span class="PUNC">;</span><span class="WHIT">
 150 <span class='line'>143</span>
 151 <span class='line'>144</span> </span><span class="WHIT">  </span><span class="COMM">/**
 152 <span class='line'>145</span>    * End the drawing operation, once the user releases the mouse button.
 153 <span class='line'>146</span>    */</span><span class="WHIT">
 154 <span class='line'>147</span> </span><span class="WHIT">  </span><span class="NAME">this.mouseup</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">function</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
 155 <span class='line'>148</span> </span><span class="WHIT">    </span><span class="KEYW">if</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="NAME">mouse.x</span><span class="WHIT"> </span><span class="PUNC">==</span><span class="WHIT"> </span><span class="NAME">x0</span><span class="WHIT"> </span><span class="PUNC">&&</span><span class="WHIT"> </span><span class="NAME">mouse.y</span><span class="WHIT"> </span><span class="PUNC">==</span><span class="WHIT"> </span><span class="NAME">y0</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
 156 <span class='line'>149</span> </span><span class="WHIT">      </span><span class="NAME">points.push</span><span class="PUNC">(</span><span class="NAME">x0</span><span class="PUNC">+</span><span class="NUMB">1</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">y0</span><span class="PUNC">+</span><span class="NUMB">1</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
 157 <span class='line'>150</span> </span><span class="WHIT">    </span><span class="PUNC">}</span><span class="WHIT">
 158 <span class='line'>151</span>
 159 <span class='line'>152</span> </span><span class="WHIT">    </span><span class="KEYW">if</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="NAME">timer</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
 160 <span class='line'>153</span> </span><span class="WHIT">      </span><span class="NAME">clearInterval</span><span class="PUNC">(</span><span class="NAME">timer</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
 161 <span class='line'>154</span> </span><span class="WHIT">      </span><span class="NAME">timer</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">null</span><span class="PUNC">;</span><span class="WHIT">
 162 <span class='line'>155</span> </span><span class="WHIT">    </span><span class="PUNC">}</span><span class="WHIT">
 163 <span class='line'>156</span>
 164 <span class='line'>157</span> </span><span class="WHIT">    </span><span class="NAME">_self.draw</span><span class="PUNC">(</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
 165 <span class='line'>158</span> </span><span class="WHIT">    </span><span class="NAME">app.layerUpdate</span><span class="PUNC">(</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
 166 <span class='line'>159</span>
 167 <span class='line'>160</span> </span><span class="WHIT">    </span><span class="KEYW">return</span><span class="WHIT"> </span><span class="KEYW">true</span><span class="PUNC">;</span><span class="WHIT">
 168 <span class='line'>161</span> </span><span class="WHIT">  </span><span class="PUNC">}</span><span class="PUNC">;</span><span class="WHIT">
 169 <span class='line'>162</span>
 170 <span class='line'>163</span> </span><span class="WHIT">  </span><span class="COMM">/**
 171 <span class='line'>164</span>    * Allows the user to press &lt;kbd>Escape&lt;/kbd> to cancel the drawing operation.
 172 <span class='line'>165</span>    *
 173 <span class='line'>166</span>    * @param {Event} ev The DOM Event object.
 174 <span class='line'>167</span>    *
 175 <span class='line'>168</span>    * @returns {Boolean} True if the drawing operation was cancelled, or false if
 176 <span class='line'>169</span>    * not.
 177 <span class='line'>170</span>    */</span><span class="WHIT">
 178 <span class='line'>171</span> </span><span class="WHIT">  </span><span class="NAME">this.keydown</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">function</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="NAME">ev</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
 179 <span class='line'>172</span> </span><span class="WHIT">    </span><span class="KEYW">if</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="PUNC">!</span><span class="NAME">mouse.buttonDown</span><span class="WHIT"> </span><span class="PUNC">||</span><span class="WHIT"> </span><span class="NAME">ev.kid_</span><span class="WHIT"> </span><span class="PUNC">!=</span><span class="WHIT"> </span><span class="STRN">'Escape'</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
 180 <span class='line'>173</span> </span><span class="WHIT">      </span><span class="KEYW">return</span><span class="WHIT"> </span><span class="KEYW">false</span><span class="PUNC">;</span><span class="WHIT">
 181 <span class='line'>174</span> </span><span class="WHIT">    </span><span class="PUNC">}</span><span class="WHIT">
 182 <span class='line'>175</span>
 183 <span class='line'>176</span> </span><span class="WHIT">    </span><span class="KEYW">if</span><span class="WHIT"> </span><span class="PUNC">(</span><span class="NAME">timer</span><span class="PUNC">)</span><span class="WHIT"> </span><span class="PUNC">{</span><span class="WHIT">
 184 <span class='line'>177</span> </span><span class="WHIT">      </span><span class="NAME">clearInterval</span><span class="PUNC">(</span><span class="NAME">timer</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
 185 <span class='line'>178</span> </span><span class="WHIT">      </span><span class="NAME">timer</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">null</span><span class="PUNC">;</span><span class="WHIT">
 186 <span class='line'>179</span> </span><span class="WHIT">    </span><span class="PUNC">}</span><span class="WHIT">
 187 <span class='line'>180</span>
 188 <span class='line'>181</span> </span><span class="WHIT">    </span><span class="NAME">context.clearRect</span><span class="PUNC">(</span><span class="NUMB">0</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NUMB">0</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">image.width</span><span class="PUNC">,</span><span class="WHIT"> </span><span class="NAME">image.height</span><span class="PUNC">)</span><span class="PUNC">;</span><span class="WHIT">
 189 <span class='line'>182</span> </span><span class="WHIT">    </span><span class="NAME">mouse.buttonDown</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="KEYW">false</span><span class="PUNC">;</span><span class="WHIT">
 190 <span class='line'>183</span> </span><span class="WHIT">    </span><span class="NAME">points</span><span class="WHIT"> </span><span class="PUNC">=</span><span class="WHIT"> </span><span class="PUNC">[</span><span class="PUNC">]</span><span class="PUNC">;</span><span class="WHIT">
 191 <span class='line'>184</span>
 192 <span class='line'>185</span> </span><span class="WHIT">    </span><span class="KEYW">return</span><span class="WHIT"> </span><span class="KEYW">true</span><span class="PUNC">;</span><span class="WHIT">
 193 <span class='line'>186</span> </span><span class="WHIT">  </span><span class="PUNC">}</span><span class="PUNC">;</span><span class="WHIT">
 194 <span class='line'>187</span> </span><span class="PUNC">}</span><span class="PUNC">;</span><span class="WHIT">
 195 <span class='line'>188</span>
 196 <span class='line'>189</span> </span><span class="COMM">// vim:set spell spl=en fo=wan1croqlt tw=80 ts=2 sw=2 sts=2 sta et ai cin fenc=utf-8 ff=unix:</span><span class="WHIT">
 197 <span class='line'>190</span>
 198 <span class='line'>191</span> </span></pre></body></html>