| 1 | <!DOCTYPE html>
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| 2 | <html>
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| 3 | <head>
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| 4 | <meta charset="UTF-8">
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| 5 | <title>View</title>
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| 6 | <base target="class-frame">
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| 7 | <link href="../assets/css/docs.css" rel="stylesheet" type="text/css">
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| 8 | <script src="../assets/js/paper.js"></script>
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| 9 | <script src="../assets/js/jquery.js"></script>
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| 10 | <script src="../assets/js/codemirror.js"></script>
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| 11 | <script src="../assets/js/docs.js"></script>
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| 12 | </head>
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| 13 | <body class="reference">
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| 14 | <div class="reference-class">
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| 15 | <h1>View</h1>
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| 16 |
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| 17 | <p>The View object wraps an HTML element and handles drawing and user
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| 18 | interaction through mouse and keyboard for it. It offer means to scroll the
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| 19 | view, find the currently visible bounds in project coordinates, or the
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| 20 | center, both useful for constructing artwork that should appear centered on
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| 21 | screen.</p>
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| 22 |
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| 23 | </div>
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| 24 |
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| 25 |
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| 26 |
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| 27 |
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| 28 |
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| 29 | <div class="reference-members"><h2>Properties</h2>
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| 30 |
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| 31 |
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| 32 | <div id="element" class="member">
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| 33 | <div class="member-link">
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| 34 | <a name="element" href="#element"><tt><b>element</b></tt></a>
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| 35 | </div>
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| 36 | <div class="member-description hidden">
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| 37 |
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| 38 | <div class="member-text">
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| 39 | <p>The underlying native element.</p>
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| 40 |
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| 41 | <p>Read only.</p>
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| 42 |
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| 43 |
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| 44 | <ul><b>Type:</b>
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| 45 | <li>
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| 46 | <tt>HTMLCanvasElement</tt>
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| 47 | </li>
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| 48 | </ul>
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| 49 |
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| 50 |
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| 51 | </div>
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| 52 |
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| 53 | </div>
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| 54 | </div>
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| 55 |
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| 56 |
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| 57 | <div id="viewsize" class="member">
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| 58 | <div class="member-link">
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| 59 | <a name="viewsize" href="#viewsize"><tt><b>viewSize</b></tt></a>
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| 60 | </div>
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| 61 | <div class="member-description hidden">
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| 62 |
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| 63 | <div class="member-text">
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| 64 | <p>The size of the view. Changing the view's size will resize it's
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| 65 | underlying element.</p>
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| 66 |
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| 67 |
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| 68 | <ul><b>Type:</b>
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| 69 | <li>
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| 70 | <a href="../classes/Size.html"><tt>Size</tt></a>
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| 71 | </li>
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| 72 | </ul>
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| 73 |
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| 74 |
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| 75 | </div>
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| 76 |
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| 77 | </div>
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| 78 | </div>
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| 79 |
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| 80 |
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| 81 | <div id="bounds" class="member">
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| 82 | <div class="member-link">
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| 83 | <a name="bounds" href="#bounds"><tt><b>bounds</b></tt></a>
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| 84 | </div>
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| 85 | <div class="member-description hidden">
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| 86 |
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| 87 | <div class="member-text">
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| 88 | <p>The bounds of the currently visible area in project coordinates.</p>
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| 89 |
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| 90 | <p>Read only.</p>
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| 91 |
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| 92 |
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| 93 | <ul><b>Type:</b>
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| 94 | <li>
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| 95 | <a href="../classes/Rectangle.html"><tt>Rectangle</tt></a>
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| 96 | </li>
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| 97 | </ul>
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| 98 |
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| 99 |
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| 100 | </div>
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| 101 |
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| 102 | </div>
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| 103 | </div>
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| 104 |
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| 105 |
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| 106 | <div id="size" class="member">
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| 107 | <div class="member-link">
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| 108 | <a name="size" href="#size"><tt><b>size</b></tt></a>
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| 109 | </div>
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| 110 | <div class="member-description hidden">
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| 111 |
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| 112 | <div class="member-text">
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| 113 | <p>The size of the visible area in project coordinates.</p>
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| 114 |
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| 115 | <p>Read only.</p>
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| 116 |
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| 117 |
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| 118 | <ul><b>Type:</b>
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| 119 | <li>
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| 120 | <a href="../classes/Size.html"><tt>Size</tt></a>
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| 121 | </li>
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| 122 | </ul>
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| 123 |
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| 124 |
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| 125 | </div>
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| 126 |
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| 127 | </div>
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| 128 | </div>
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| 129 |
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| 130 |
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| 131 | <div id="center" class="member">
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| 132 | <div class="member-link">
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| 133 | <a name="center" href="#center"><tt><b>center</b></tt></a>
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| 134 | </div>
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| 135 | <div class="member-description hidden">
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| 136 |
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| 137 | <div class="member-text">
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| 138 | <p>The center of the visible area in project coordinates.</p>
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| 139 |
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| 140 |
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| 141 | <ul><b>Type:</b>
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| 142 | <li>
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| 143 | <a href="../classes/Point.html"><tt>Point</tt></a>
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| 144 | </li>
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| 145 | </ul>
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| 146 |
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| 147 |
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| 148 | </div>
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| 149 |
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| 150 | </div>
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| 151 | </div>
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| 152 |
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| 153 |
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| 154 | <div id="zoom" class="member">
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| 155 | <div class="member-link">
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| 156 | <a name="zoom" href="#zoom"><tt><b>zoom</b></tt></a>
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| 157 | </div>
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| 158 | <div class="member-description hidden">
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| 159 |
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| 160 | <div class="member-text">
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| 161 | <p>The zoom factor by which the project coordinates are magnified.</p>
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| 162 |
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| 163 |
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| 164 | <ul><b>Type:</b>
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| 165 | <li>
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| 166 | <tt>Number</tt>
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| 167 | </li>
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| 168 | </ul>
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| 169 |
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| 170 |
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| 171 | </div>
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| 172 |
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| 173 | </div>
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| 174 | </div>
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| 175 |
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| 176 |
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| 177 | <h3>Event Handlers</h3>
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| 178 |
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| 179 | <div id="onframe" class="member">
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| 180 | <div class="member-link">
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| 181 | <a name="onframe" href="#onframe"><tt><b>onFrame</b></tt></a>
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| 182 | </div>
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| 183 | <div class="member-description hidden">
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| 184 |
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| 185 | <div class="member-text">
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| 186 | <p>Handler function to be called on each frame of an animation.</p>
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| 187 | <p>The function receives an event object which contains information about
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| 188 | the frame event:</p>
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| 189 | <p><b><tt>event.count</tt></b>: the number of times the frame event was
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| 190 | fired.</p>
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| 191 | <p><b><tt>event.time</tt></b>: the total amount of time passed since the
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| 192 | first frame event in seconds.</p>
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| 193 | <p><b><tt>event.delta</tt></b>: the time passed in seconds since the last
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| 194 | frame event.</p>
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| 195 |
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| 196 |
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| 197 | <ul><b>Type:</b>
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| 198 | <li>
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| 199 | <tt>Function</tt>
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| 200 | </li>
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| 201 | </ul>
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| 202 |
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| 203 | <p>
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| 204 | <b>Example</b> — Creating an animation:
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| 205 | </p>
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| 206 |
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| 207 | <div class="paperscript split">
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| 208 |
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| 209 | <div class="buttons">
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| 210 | <div class="button run">Run</div>
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| 211 | </div>
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| 212 |
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| 213 | <script type="text/paperscript" canvas="canvas-0">
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| 214 | // Create a rectangle shaped path with its top left point at:
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| 215 | // {x: 50, y: 25} and a size of {width: 50, height: 50}
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| 216 | var path = new Path.Rectangle(new Point(50, 25), new Size(50, 50));
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| 217 | path.fillColor = 'black';
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| 218 |
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| 219 | function onFrame(event) {
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| 220 | // Every frame, rotate the path by 3 degrees:
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| 221 | path.rotate(3);
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| 222 | }
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| 223 | </script>
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| 224 | <div class="canvas"><canvas width="516" height="100" id="canvas-0"></canvas></div>
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| 225 | </div>
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| 226 |
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| 227 |
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| 228 | </div>
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| 229 |
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| 230 | </div>
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| 231 | </div>
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| 232 |
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| 233 |
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| 234 | <div id="onresize" class="member">
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| 235 | <div class="member-link">
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| 236 | <a name="onresize" href="#onresize"><tt><b>onResize</b></tt></a>
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| 237 | </div>
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| 238 | <div class="member-description hidden">
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| 239 |
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| 240 | <div class="member-text">
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| 241 | <p>Handler function that is called whenever a view is resized.</p>
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| 242 |
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| 243 |
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| 244 | <ul><b>Type:</b>
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| 245 | <li>
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| 246 | <tt>Function</tt>
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| 247 | </li>
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| 248 | </ul>
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| 249 |
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| 250 | <p>
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| 251 | <b>Example</b> — Repositioning items when a view is resized:
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| 252 | </p>
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| 253 |
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| 254 |
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| 255 | <pre class="code">// Create a circle shaped path in the center of the view:
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| 256 | var path = new Path.Circle(view.bounds.center, 30);
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| 257 | path.fillColor = 'red';
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| 258 |
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| 259 | function onResize(event) {
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| 260 | // Whenever the view is resized, move the path to its center:
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| 261 | path.position = view.center;
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| 262 | }</pre>
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| 263 |
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| 264 | </div>
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| 265 |
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| 266 | </div>
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| 267 | </div>
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| 268 |
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| 269 | </div>
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| 270 |
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| 271 |
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| 272 |
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| 273 | <!-- ============================== methods ================================ -->
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| 274 | <div class="reference-members"><h2>Methods</h2>
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| 275 |
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| 276 |
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| 277 | <div id="draw" class="member">
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| 278 | <div class="member-link">
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| 279 | <a name="draw" href="#draw"><tt><b>draw</b>()</tt></a>
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| 280 | </div>
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| 281 | <div class="member-description hidden">
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| 282 | <div class="member-text">
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| 283 | <p>Draws the view.</p>
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| 284 |
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| 285 |
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| 286 |
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| 287 |
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| 288 | </div>
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| 289 | </div>
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| 290 | </div>
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| 291 |
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| 292 |
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| 293 | <div id="remove" class="member">
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| 294 | <div class="member-link">
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| 295 | <a name="remove" href="#remove"><tt><b>remove</b>()</tt></a>
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| 296 | </div>
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| 297 | <div class="member-description hidden">
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| 298 | <div class="member-text">
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| 299 | <p>Removes this view from the project and frees the associated element.</p>
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| 300 |
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| 301 |
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| 302 |
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| 303 |
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| 304 | </div>
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| 305 | </div>
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| 306 | </div>
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| 307 |
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| 308 |
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| 309 | <div id="isvisible" class="member">
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| 310 | <div class="member-link">
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| 311 | <a name="isvisible" href="#isvisible"><tt><b>isVisible</b>()</tt></a>
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| 312 | </div>
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| 313 | <div class="member-description hidden">
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| 314 | <div class="member-text">
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| 315 | <p>Checks whether the view is currently visible within the current browser
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| 316 | viewport.</p>
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| 317 |
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| 318 |
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| 319 | <ul><b>Returns:</b>
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| 320 |
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| 321 | <li>
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| 322 | <tt><tt>Boolean</tt></tt> — whether the view is visible.
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| 323 | </li>
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| 324 |
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| 325 | </ul>
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| 326 |
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| 327 |
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| 328 |
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| 329 | </div>
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| 330 | </div>
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| 331 | </div>
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| 332 |
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| 333 |
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| 334 | <div id="scrollby-point" class="member">
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| 335 | <div class="member-link">
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| 336 | <a name="scrollby-point" href="#scrollby-point"><tt><b>scrollBy</b>(point)</tt></a>
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| 337 | </div>
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| 338 | <div class="member-description hidden">
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| 339 | <div class="member-text">
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| 340 | <p>Scrolls the view by the given vector.</p>
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| 341 |
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| 342 | <ul><b>Parameters:</b>
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| 343 |
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| 344 | <li>
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| 345 | <tt>point:</tt>
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| 346 | <a href="../classes/Point.html"><tt>Point</tt></a>
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| 347 |
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| 348 |
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| 349 | </li>
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| 350 |
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| 351 | </ul>
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| 352 |
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| 353 |
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| 354 |
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| 355 |
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| 356 | </div>
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| 357 | </div>
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| 358 | </div>
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| 359 |
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| 360 |
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| 361 | <div id="draw" class="member">
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| 362 | <div class="member-link">
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| 363 | <a name="draw" href="#draw"><tt><b>draw</b>()</tt></a>
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| 364 | </div>
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| 365 | <div class="member-description hidden">
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| 366 | <div class="member-text">
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| 367 | <p>Draws the view.</p>
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| 368 |
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| 369 |
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| 370 |
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| 371 |
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| 372 | </div>
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| 373 | </div>
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| 374 | </div>
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| 375 |
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| 376 |
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| 377 | <h3>Event Handling</h3>
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| 378 |
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| 379 | <div id="attach-type-function" class="member">
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| 380 | <div class="member-link">
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| 381 | <a name="attach-type-function" href="#attach-type-function"><tt><b>attach</b>(type, function)</tt></a>
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| 382 | </div>
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| 383 | <div class="member-description hidden">
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| 384 | <div class="member-text">
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| 385 | <p>Attach an event handler to the view.</p>
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| 386 |
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| 387 | <ul><b>Parameters:</b>
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| 388 |
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| 389 | <li>
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| 390 | <tt>type:</tt>
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| 391 | <tt>String('frame'|'resize')</tt>
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| 392 | — the event type
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| 393 |
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| 394 | </li>
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| 395 |
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| 396 | <li>
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| 397 | <tt>function:</tt>
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| 398 | <tt>Function</tt>
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| 399 | — The function to be called when the event
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| 400 | occurs
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| 401 |
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| 402 | </li>
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| 403 |
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| 404 | </ul>
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| 405 |
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| 406 |
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| 407 |
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| 408 | <p>
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| 409 | <b>Example</b> — Create a rectangle shaped path with its top left point at: {x: 50, y: 25} and a size of {width: 50, height: 50}
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| 410 | </p>
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| 411 |
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| 412 | <div class="paperscript split">
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| 413 |
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| 414 | <div class="buttons">
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| 415 | <div class="button run">Run</div>
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| 416 | </div>
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| 417 |
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| 418 | <script type="text/paperscript" canvas="canvas-1">
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| 419 | var path = new Path.Rectangle(new Point(50, 25), new Size(50, 50));
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| 420 | path.fillColor = 'black';
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| 421 |
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| 422 | var frameHandler = function(event) {
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| 423 | // Every frame, rotate the path by 3 degrees:
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| 424 | path.rotate(3);
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| 425 | };
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| 426 |
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| 427 | view.on('frame', frameHandler);
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| 428 | </script>
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| 429 | <div class="canvas"><canvas width="516" height="100" id="canvas-1"></canvas></div>
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| 430 | </div>
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| 431 |
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| 432 |
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| 433 | </div>
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| 434 | </div>
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| 435 | </div>
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| 436 |
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| 437 |
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| 438 | <div id="attach-param" class="member">
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| 439 | <div class="member-link">
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| 440 | <a name="attach-param" href="#attach-param"><tt><b>attach</b>(param)</tt></a>
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| 441 | </div>
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| 442 | <div class="member-description hidden">
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| 443 | <div class="member-text">
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| 444 | <p>Attach one or more event handlers to the view.</p>
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| 445 |
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| 446 | <ul><b>Parameters:</b>
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| 447 |
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| 448 | <li>
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| 449 | <tt>param:</tt>
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| 450 | <tt>Object</tt>
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| 451 | — an object literal containing one or more of the
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| 452 | following properties: <tt>frame, resize</tt>.
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| 453 | // Create a rectangle shaped path with its top left point at:
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| 454 | // {x: 50, y: 25} and a size of {width: 50, height: 50}
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| 455 | var path = new Path.Rectangle(new Point(50, 25), new Size(50, 50));
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| 456 | path.fillColor = 'black';
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| 457 |
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| 458 | var frameHandler = function(event) {
|
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| 459 | // Every frame, rotate the path by 3 degrees:
|
|---|
| 460 | path.rotate(3);
|
|---|
| 461 | };
|
|---|
| 462 |
|
|---|
| 463 | view.on({
|
|---|
| 464 | frame: frameHandler
|
|---|
| 465 | });
|
|---|
| 466 |
|
|---|
| 467 | </li>
|
|---|
| 468 |
|
|---|
| 469 | </ul>
|
|---|
| 470 |
|
|---|
| 471 |
|
|---|
| 472 |
|
|---|
| 473 |
|
|---|
| 474 | </div>
|
|---|
| 475 | </div>
|
|---|
| 476 | </div>
|
|---|
| 477 |
|
|---|
| 478 |
|
|---|
| 479 | <div id="detach-type-function" class="member">
|
|---|
| 480 | <div class="member-link">
|
|---|
| 481 | <a name="detach-type-function" href="#detach-type-function"><tt><b>detach</b>(type, function)</tt></a>
|
|---|
| 482 | </div>
|
|---|
| 483 | <div class="member-description hidden">
|
|---|
| 484 | <div class="member-text">
|
|---|
| 485 | <p>Detach an event handler from the view.</p>
|
|---|
| 486 |
|
|---|
| 487 | <ul><b>Parameters:</b>
|
|---|
| 488 |
|
|---|
| 489 | <li>
|
|---|
| 490 | <tt>type:</tt>
|
|---|
| 491 | <tt>String('frame'|'resize')</tt>
|
|---|
| 492 | — the event type
|
|---|
| 493 |
|
|---|
| 494 | </li>
|
|---|
| 495 |
|
|---|
| 496 | <li>
|
|---|
| 497 | <tt>function:</tt>
|
|---|
| 498 | <tt>Function</tt>
|
|---|
| 499 | — The function to be detached
|
|---|
| 500 |
|
|---|
| 501 | </li>
|
|---|
| 502 |
|
|---|
| 503 | </ul>
|
|---|
| 504 |
|
|---|
| 505 |
|
|---|
| 506 |
|
|---|
| 507 | <p>
|
|---|
| 508 | <b>Example</b> — Create a rectangle shaped path with its top left point at: {x: 50, y: 25} and a size of {width: 50, height: 50}
|
|---|
| 509 | </p>
|
|---|
| 510 |
|
|---|
| 511 | <div class="paperscript split">
|
|---|
| 512 |
|
|---|
| 513 | <div class="buttons">
|
|---|
| 514 | <div class="button run">Run</div>
|
|---|
| 515 | </div>
|
|---|
| 516 |
|
|---|
| 517 | <script type="text/paperscript" canvas="canvas-2">
|
|---|
| 518 | var path = new Path.Rectangle(new Point(50, 25), new Size(50, 50));
|
|---|
| 519 | path.fillColor = 'black';
|
|---|
| 520 |
|
|---|
| 521 | var frameHandler = function(event) {
|
|---|
| 522 | // Every frame, rotate the path by 3 degrees:
|
|---|
| 523 | path.rotate(3);
|
|---|
| 524 | };
|
|---|
| 525 |
|
|---|
| 526 | view.on({
|
|---|
| 527 | frame: frameHandler
|
|---|
| 528 | });
|
|---|
| 529 |
|
|---|
| 530 | // When the user presses the mouse,
|
|---|
| 531 | // detach the frame handler from the view:
|
|---|
| 532 | function onMouseDown(event) {
|
|---|
| 533 | view.detach('frame');
|
|---|
| 534 | }
|
|---|
| 535 | </script>
|
|---|
| 536 | <div class="canvas"><canvas width="516" height="100" id="canvas-2"></canvas></div>
|
|---|
| 537 | </div>
|
|---|
| 538 |
|
|---|
| 539 |
|
|---|
| 540 | </div>
|
|---|
| 541 | </div>
|
|---|
| 542 | </div>
|
|---|
| 543 |
|
|---|
| 544 |
|
|---|
| 545 | <div id="detach-param" class="member">
|
|---|
| 546 | <div class="member-link">
|
|---|
| 547 | <a name="detach-param" href="#detach-param"><tt><b>detach</b>(param)</tt></a>
|
|---|
| 548 | </div>
|
|---|
| 549 | <div class="member-description hidden">
|
|---|
| 550 | <div class="member-text">
|
|---|
| 551 | <p>Detach one or more event handlers from the view.</p>
|
|---|
| 552 |
|
|---|
| 553 | <ul><b>Parameters:</b>
|
|---|
| 554 |
|
|---|
| 555 | <li>
|
|---|
| 556 | <tt>param:</tt>
|
|---|
| 557 | <tt>Object</tt>
|
|---|
| 558 | — an object literal containing one or more of the
|
|---|
| 559 | following properties: <tt>frame, resize</tt>
|
|---|
| 560 |
|
|---|
| 561 | </li>
|
|---|
| 562 |
|
|---|
| 563 | </ul>
|
|---|
| 564 |
|
|---|
| 565 |
|
|---|
| 566 |
|
|---|
| 567 |
|
|---|
| 568 | </div>
|
|---|
| 569 | </div>
|
|---|
| 570 | </div>
|
|---|
| 571 |
|
|---|
| 572 |
|
|---|
| 573 | <div id="fire-type-event" class="member">
|
|---|
| 574 | <div class="member-link">
|
|---|
| 575 | <a name="fire-type-event" href="#fire-type-event"><tt><b>fire</b>(type, event)</tt></a>
|
|---|
| 576 | </div>
|
|---|
| 577 | <div class="member-description hidden">
|
|---|
| 578 | <div class="member-text">
|
|---|
| 579 | <p>Fire an event on the view.</p>
|
|---|
| 580 |
|
|---|
| 581 | <ul><b>Parameters:</b>
|
|---|
| 582 |
|
|---|
| 583 | <li>
|
|---|
| 584 | <tt>type:</tt>
|
|---|
| 585 | <tt>String('frame'|'resize')</tt>
|
|---|
| 586 | — the event type
|
|---|
| 587 |
|
|---|
| 588 | </li>
|
|---|
| 589 |
|
|---|
| 590 | <li>
|
|---|
| 591 | <tt>event:</tt>
|
|---|
| 592 | <tt>Object</tt>
|
|---|
| 593 | — an object literal containing properties describing
|
|---|
| 594 | the event.
|
|---|
| 595 |
|
|---|
| 596 | </li>
|
|---|
| 597 |
|
|---|
| 598 | </ul>
|
|---|
| 599 |
|
|---|
| 600 |
|
|---|
| 601 |
|
|---|
| 602 |
|
|---|
| 603 | </div>
|
|---|
| 604 | </div>
|
|---|
| 605 | </div>
|
|---|
| 606 |
|
|---|
| 607 |
|
|---|
| 608 | <div id="responds-type" class="member">
|
|---|
| 609 | <div class="member-link">
|
|---|
| 610 | <a name="responds-type" href="#responds-type"><tt><b>responds</b>(type)</tt></a>
|
|---|
| 611 | </div>
|
|---|
| 612 | <div class="member-description hidden">
|
|---|
| 613 | <div class="member-text">
|
|---|
| 614 | <p>Check if the view has one or more event handlers of the specified type.</p>
|
|---|
| 615 |
|
|---|
| 616 | <ul><b>Parameters:</b>
|
|---|
| 617 |
|
|---|
| 618 | <li>
|
|---|
| 619 | <tt>type:</tt>
|
|---|
| 620 | <tt>String('frame'|'resize')</tt>
|
|---|
| 621 | — the event type
|
|---|
| 622 |
|
|---|
| 623 | </li>
|
|---|
| 624 |
|
|---|
| 625 | </ul>
|
|---|
| 626 |
|
|---|
| 627 |
|
|---|
| 628 | <ul><b>Returns:</b>
|
|---|
| 629 |
|
|---|
| 630 | <li>
|
|---|
| 631 | <tt><tt>Boolean</tt></tt> — <tt>true</tt> if the view has one or more event handlers of
|
|---|
| 632 | the specified type, <tt>false</tt> otherwise
|
|---|
| 633 | </li>
|
|---|
| 634 |
|
|---|
| 635 | </ul>
|
|---|
| 636 |
|
|---|
| 637 |
|
|---|
| 638 |
|
|---|
| 639 | </div>
|
|---|
| 640 | </div>
|
|---|
| 641 | </div>
|
|---|
| 642 |
|
|---|
| 643 | </div>
|
|---|
| 644 |
|
|---|
| 645 |
|
|---|
| 646 |
|
|---|
| 647 |
|
|---|
| 648 | <!-- =========================== copyright notice ========================= -->
|
|---|
| 649 | <p class="footer">Copyright © 2011 <a href="http://www.lehni.org" target="_blank">Jürg Lehni</a> & <a href="http://www.jonathanpuckey.com" target="_blank">Jonathan Puckey</a>. All Rights Reserved.</p>
|
|---|
| 650 | <div class="content-end"></div>
|
|---|
| 651 |
|
|---|
| 652 | </body> |
|---|
