ext-grid.js 5.1 KB

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