ext-grid.js
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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');
}
}
}
}]
};
});