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- /*
- * ext-grid.js
- *
- * Licensed under the Apache License, Version 2
- *
- * Copyright(c) 2010 Redou Mine
- * Copyright(c) 2010 Alexis Deveria
- *
- */
- // Dependencies:
- // 1) units.js
- // 2) everything else
- svgEditor.addExtension("view_grid", function(s) {
- var svgdoc = document.getElementById("svgcanvas").ownerDocument,
- svgns = "http://www.w3.org/2000/svg",
- dims = svgEditor.curConfig.dimensions,
- svgroot = s.svgroot;
- var showGrid = false;
- var assignAttributes = svgCanvas.assignAttributes;
-
- var hcanvas = document.createElement('canvas');
- $(hcanvas).hide().appendTo('body');
- var canvasgrid = svgdoc.createElementNS(svgns, "svg");
- assignAttributes(canvasgrid, {
- 'id': 'canvasGrid',
- 'width': '100%',
- 'height': '100%',
- 'x': 0,
- 'y': 0,
- 'overflow': 'visible',
- 'display': 'none'
- });
-
- var canvBG = $('#canvasBackground');
- canvBG.append(canvasgrid);
- // grid-pattern
- var gridPattern = svgdoc.createElementNS(svgns, "pattern");
- assignAttributes(gridPattern, {
- 'id': 'gridpattern',
- 'patternUnits': 'userSpaceOnUse',
- 'x': 0, //-(value.strokeWidth / 2), // position for strokewidth
- 'y': 0, //-(value.strokeWidth / 2), // position for strokewidth
- 'width': 100,
- 'height': 100
- });
-
- var gridimg = svgdoc.createElementNS(svgns, "image");
- assignAttributes(gridimg, {
- 'x': 0,
- 'y': 0,
- 'width': 100,
- 'height': 100
- });
-
- gridPattern.appendChild(gridimg);
- $('#svgroot defs').append(gridPattern);
- // grid-box
- var gridBox = svgdoc.createElementNS(svgns, "rect");
- assignAttributes(gridBox, {
- 'width': '100%',
- 'height': '100%',
- 'x': 0,
- 'y': 0,
- 'stroke-width': 0,
- 'stroke': 'none',
- 'fill': 'url(#gridpattern)',
- 'style': 'pointer-events: none; display:visible;'
- });
- $('#canvasGrid').append(gridBox);
- // });
- function updateGrid(zoom) {
- // TODO: Try this with <line> elements, then compare performance difference
-
- var bgwidth = +canvBG.attr('width');
- var bgheight = +canvBG.attr('height');
-
- var units = svgedit.units.getTypeMap();
- var unit = units[svgEditor.curConfig.baseUnit]; // 1 = 1px
- var r_intervals = [.01, .1, 1, 10, 100, 1000];
-
- var d = 0;
- var is_x = (d === 0);
- var dim = is_x ? 'x' : 'y';
- var lentype = is_x?'width':'height';
- var c_elem = svgCanvas.getContentElem();
- var content_d = c_elem.getAttribute(dim)-0;
-
- var hcanv = hcanvas;
-
- var u_multi = unit * zoom;
-
- // Calculate the main number interval
- var raw_m = 100 / u_multi;
- var multi = 1;
- for(var i = 0; i < r_intervals.length; i++) {
- var num = r_intervals[i];
- multi = num;
- if(raw_m <= num) {
- break;
- }
- }
-
- var big_int = multi * u_multi;
- // Set the canvas size to the width of the container
- hcanv.width = big_int;
- hcanv.height = big_int;
- var ctx = hcanv.getContext("2d");
- var ruler_d = 0;
- var cur_d = .5;
-
- var part = big_int / 10;
- ctx.globalAlpha = 0.2;
- ctx.strokeStyle = "#000";
- for(var i = 1; i < 10; i++) {
- var sub_d = Math.round(part * i) + .5;
- // var line_num = (i % 2)?12:10;
- var line_num = 0;
- ctx.moveTo(sub_d, big_int);
- ctx.lineTo(sub_d, line_num);
- ctx.moveTo(big_int, sub_d);
- ctx.lineTo(line_num ,sub_d);
- }
- ctx.stroke();
- ctx.beginPath();
- ctx.globalAlpha = 0.5;
- ctx.moveTo(cur_d, big_int);
- ctx.lineTo(cur_d, 0);
- ctx.moveTo(big_int, cur_d);
- ctx.lineTo(0, cur_d);
- ctx.stroke();
- var datauri = hcanv.toDataURL('image/png');
- gridimg.setAttribute('width', big_int);
- gridimg.setAttribute('height', big_int);
- gridimg.parentNode.setAttribute('width', big_int);
- gridimg.parentNode.setAttribute('height', big_int);
- svgCanvas.setHref(gridimg, datauri);
- }
- return {
- name: "view_grid",
- svgicons: "extensions/grid-icon.xml",
- zoomChanged: function(zoom) {
- // update size
- if(showGrid) updateGrid(zoom);
- },
- buttons: [{
- id: "view_grid",
- type: "context",
- panel: "editor_panel",
- title: "Show/Hide Grid",
- events: {
- 'click': function() {
- var gr = !$('#view_grid').hasClass('push_button_pressed');
- if (gr) {
- svgEditor.curConfig.showGrid = showGrid = true;
- $('#view_grid').addClass('push_button_pressed').removeClass('tool_button');
- $('#canvasGrid').attr('display', 'normal');
- updateGrid(svgCanvas.getZoom());
- }
- else {
- svgEditor.curConfig.showGrid = showGrid = false;
- $('#view_grid').removeClass('push_button_pressed').addClass('tool_button');
- $('#canvasGrid').attr('display', 'none');
- }
- }
- }
- }]
- };
- });
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