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desuto-platform/desuto-viewer/Desuto-webviewer/public/js/svg-edit/extensions/ext-grid.js
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ext-grid.js
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/*globals svgEditor, svgedit, svgCanvas, $*/
/*jslint vars: true*/
/*
* 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() { 'use strict';
var NS = svgedit.NS,
svgdoc = document.getElementById('svgcanvas').ownerDocument,
showGrid = svgEditor.curConfig.showGrid || false,
assignAttributes = svgCanvas.assignAttributes,
hcanvas = document.createElement('canvas'),
canvBG = $('#canvasBackground'),
units = svgedit.units.getTypeMap(),
intervals = [0.01, 0.1, 1, 10, 100, 1000];
$(hcanvas).hide().appendTo('body');
var canvasGrid = svgdoc.createElementNS(NS.SVG, 'svg');
assignAttributes(canvasGrid, {
'id': 'canvasGrid',
'width': '100%',
'height': '100%',
'x': 0,
'y': 0,
'overflow': 'visible',
'display': 'none'
});
canvBG.append(canvasGrid);
// grid-pattern
var gridPattern = svgdoc.createElementNS(NS.SVG, '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(NS.SVG, 'image');
assignAttributes(gridimg, {
'x': 0,
'y': 0,
'width': 100,
'height': 100
});
gridPattern.appendChild(gridimg);
$('#svgroot defs').append(gridPattern);
// grid-box
var gridBox = svgdoc.createElementNS(NS.SVG, '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) {
var i;
// TODO: Try this with <line> elements, then compare performance difference
var unit = units[svgEditor.curConfig.baseUnit]; // 1 = 1px
var u_multi = unit * zoom;
// Calculate the main number interval
var raw_m = 100 / u_multi;
var multi = 1;
for (i = 0; i < intervals.length; i++) {
var num = 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
hcanvas.width = big_int;
hcanvas.height = big_int;
var ctx = hcanvas.getContext('2d');
var cur_d = 0.5;
var part = big_int / 10;
ctx.globalAlpha = 0.2;
ctx.strokeStyle = svgEditor.curConfig.gridColor;
for (i = 1; i < 10; i++) {
var sub_d = Math.round(part * i) + 0.5;
// 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 = hcanvas.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);
}
function gridUpdate () {
if (showGrid) {
updateGrid(svgCanvas.getZoom());
}
$('#canvasGrid').toggle(showGrid);
$('#view_grid').toggleClass('push_button_pressed tool_button');
}
return {
name: 'view_grid',
svgicons: svgEditor.curConfig.extPath + 'grid-icon.xml',
zoomChanged: function(zoom) {
if (showGrid) {updateGrid(zoom);}
},
callback: function () {
if (showGrid) {
gridUpdate();
}
},
buttons: [{
id: 'view_grid',
type: 'context',
panel: 'editor_panel',
title: 'Show/Hide Grid',
events: {
click: function() {
svgEditor.curConfig.showGrid = showGrid = !showGrid;
gridUpdate();
}
}
}]
};
});
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