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