1 | /*
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2 | * ext-grid.js
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3 | *
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4 | * Licensed under the Apache License, Version 2
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5 | *
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6 | * Copyright(c) 2010 Redou Mine
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7 | * Copyright(c) 2010 Alexis Deveria
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8 | *
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9 | */
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10 |
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11 | // Dependencies:
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12 | // 1) units.js
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13 | // 2) everything else
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14 |
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15 | methodDraw.addExtension("view_grid", function(s) {
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16 | if (!document.getElementById("canvasGrid")){
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17 | var svgdoc = document.getElementById("svgcanvas").ownerDocument,
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18 | svgns = "http://www.w3.org/2000/svg",
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19 | dims = methodDraw.curConfig.dimensions,
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20 | svgroot = s.svgroot;
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21 | var svgCanvas = methodDraw.canvas;
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22 | var showGrid = false;
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23 | var assignAttributes = s.assignAttributes;
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24 |
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25 | var hcanvas = document.createElement('canvas');
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26 | $(hcanvas).hide().appendTo('body');
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27 |
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28 | var canvasgrid = svgdoc.createElementNS(svgns, "g");
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29 | assignAttributes(canvasgrid, {
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30 | 'id': 'canvasGrid',
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31 | 'width': '100%',
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32 | 'height': '100%',
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33 | 'x': 0,
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34 | 'y': 0,
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35 | 'overflow': 'visible',
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36 | 'display': 'none'
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37 | });
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38 |
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39 | var canvBG = $('#canvas_background');
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40 | canvBG.after(canvasgrid);
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41 |
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42 |
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43 |
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44 | // grid-pattern
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45 | var gridPattern = svgdoc.createElementNS(svgns, "pattern");
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46 | assignAttributes(gridPattern, {
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47 | 'id': 'gridpattern',
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48 | 'patternUnits': 'userSpaceOnUse',
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49 | 'x': 0, //-(value.strokeWidth / 2), // position for strokewidth
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50 | 'y': 0, //-(value.strokeWidth / 2), // position for strokewidth
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51 | 'width': 100,
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52 | 'height': 100
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53 | });
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54 |
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55 | var gridimg = svgdoc.createElementNS(svgns, "image");
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56 | assignAttributes(gridimg, {
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57 | 'x': 0,
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58 | 'y': 0,
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59 | 'width': 100,
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60 | 'height': 100
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61 | });
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62 |
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63 | gridPattern.appendChild(gridimg);
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64 | $('#svgroot defs').append(gridPattern);
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65 |
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66 | // grid-box
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67 | var gridBox = svgdoc.createElementNS(svgns, "rect");
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68 | assignAttributes(gridBox, {
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69 | 'width': '100%',
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70 | 'height': '100%',
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71 | 'x': 0,
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72 | 'y': 0,
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73 | 'stroke-width': 0,
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74 | 'stroke': 'none',
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75 | 'fill': 'url(#gridpattern)',
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76 | 'style': 'pointer-events: none; display:visible;'
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77 | });
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78 | $('#canvasGrid').append(gridBox);
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79 | }
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80 | // });
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81 |
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82 | function updateGrid(zoom) {
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83 | // TODO: Try this with <line> elements, then compare performance difference
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84 |
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85 | var bgwidth = +canvBG.attr('width');
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86 | var bgheight = +canvBG.attr('height');
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87 |
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88 | var units = svgedit.units.getTypeMap();
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89 | var unit = units[methodDraw.curConfig.baseUnit]; // 1 = 1px
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90 | var r_intervals = [.01, .1, 1, 10, 100, 1000];
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91 |
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92 | var d = 0;
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93 | var is_x = (d === 0);
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94 | var dim = is_x ? 'x' : 'y';
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95 | var lentype = is_x?'width':'height';
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96 | var c_elem = svgCanvas.getContentElem();
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97 | var content_d = c_elem.getAttribute(dim)-0;
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98 |
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99 | var hcanv = hcanvas;
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100 |
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101 | var u_multi = unit * zoom;
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102 |
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103 | // Calculate the main number interval
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104 | var raw_m = 100 / u_multi;
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105 | var multi = 1;
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106 | for(var i = 0; i < r_intervals.length; i++) {
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107 | var num = r_intervals[i];
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108 | multi = num;
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109 | if(raw_m <= num) {
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110 | break;
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111 | }
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112 | }
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113 |
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114 | var big_int = multi * u_multi;
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115 |
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116 | // Set the canvas size to the width of the container
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117 | hcanv.width = big_int;
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118 | hcanv.height = big_int;
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119 | var ctx = hcanv.getContext("2d");
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120 |
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121 | var ruler_d = 0;
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122 | var cur_d = .5;
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123 |
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124 | var part = big_int / 10;
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125 |
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126 | ctx.globalAlpha = 0.2;
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127 | ctx.strokeStyle = "#000";
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128 | for(var i = 1; i < 10; i++) {
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129 | var sub_d = Math.round(part * i) + .5;
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130 | // var line_num = (i % 2)?12:10;
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131 | var line_num = 0;
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132 | ctx.moveTo(sub_d, big_int);
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133 | ctx.lineTo(sub_d, line_num);
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134 | ctx.moveTo(big_int, sub_d);
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135 | ctx.lineTo(line_num ,sub_d);
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136 | }
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137 | ctx.stroke();
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138 | ctx.beginPath();
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139 | ctx.globalAlpha = 0.5;
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140 | ctx.moveTo(cur_d, big_int);
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141 | ctx.lineTo(cur_d, 0);
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142 |
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143 | ctx.moveTo(big_int, cur_d);
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144 | ctx.lineTo(0, cur_d);
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145 | ctx.stroke();
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146 |
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147 | var datauri = hcanv.toDataURL('image/png');
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148 | gridimg.setAttribute('width', big_int);
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149 | gridimg.setAttribute('height', big_int);
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150 | gridimg.parentNode.setAttribute('width', big_int);
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151 | gridimg.parentNode.setAttribute('height', big_int);
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152 | svgCanvas.setHref(gridimg, datauri);
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153 | }
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154 |
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155 | return {
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156 | name: "view_grid",
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157 | zoomChanged: function(zoom) {
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158 | // update size
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159 | if(showGrid) updateGrid(zoom);
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160 | },
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161 |
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162 | buttons: [{
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163 | id: "view_grid",
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164 | type: "menu",
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165 | after: "tool_wireframe",
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166 | panel: "view_menu",
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167 | title: "View Grid",
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168 | events: {
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169 | 'click': function() {
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170 | var gr = !$('#view_grid').hasClass('push_button_pressed');
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171 | if (gr) {
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172 | methodDraw.curConfig.showGrid = showGrid = true;
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173 | $('#view_grid').addClass('push_button_pressed');
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174 | $('#canvasGrid').attr('display', 'inline');
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175 | updateGrid(svgCanvas.getZoom());
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176 | }
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177 | else {
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178 | methodDraw.curConfig.showGrid = showGrid = false;
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179 | $('#view_grid').removeClass('push_button_pressed');
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180 | $('#canvasGrid').attr('display', 'none');
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181 | }
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182 | }
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183 | }
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184 | }]
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185 | };
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186 | });
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