svgedit/editor/extensions/ext-grid.js

172 lines
4.6 KiB
JavaScript

/**
* ext-grid.js
*
* @license Apache-2.0
*
* @copyright 2010 Redou Mine, 2010 Alexis Deveria
*
*/
export default {
name: 'grid',
async init ({$, NS, getTypeMap, importLocale}) {
const strings = await importLocale();
const svgEditor = this;
const svgCanvas = svgEditor.canvas;
const svgdoc = document.getElementById('svgcanvas').ownerDocument,
{assignAttributes} = svgCanvas,
hcanvas = document.createElement('canvas'),
canvBG = $('#canvasBackground'),
units = getTypeMap(), // Assumes prior `init()` call on `units.js` module
intervals = [0.01, 0.1, 1, 10, 100, 1000];
let showGrid = svgEditor.curConfig.showGrid || false;
$(hcanvas).hide().appendTo('body');
const 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);
const gridDefs = svgdoc.createElementNS(NS.SVG, 'defs');
// grid-pattern
const 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
});
const gridimg = svgdoc.createElementNS(NS.SVG, 'image');
assignAttributes(gridimg, {
x: 0,
y: 0,
width: 100,
height: 100
});
gridPattern.append(gridimg);
gridDefs.append(gridPattern);
$('#canvasGrid').append(gridDefs);
// grid-box
const 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);
/**
*
* @param {Float} zoom
* @returns {undefined}
*/
function updateGrid (zoom) {
// TODO: Try this with <line> elements, then compare performance difference
const unit = units[svgEditor.curConfig.baseUnit]; // 1 = 1px
const uMulti = unit * zoom;
// Calculate the main number interval
const rawM = 100 / uMulti;
let multi = 1;
for (let i = 0; i < intervals.length; i++) {
const num = intervals[i];
multi = num;
if (rawM <= num) {
break;
}
}
const bigInt = multi * uMulti;
// Set the canvas size to the width of the container
hcanvas.width = bigInt;
hcanvas.height = bigInt;
const ctx = hcanvas.getContext('2d');
const curD = 0.5;
const part = bigInt / 10;
ctx.globalAlpha = 0.2;
ctx.strokeStyle = svgEditor.curConfig.gridColor;
for (let i = 1; i < 10; i++) {
const subD = Math.round(part * i) + 0.5;
// const lineNum = (i % 2)?12:10;
const lineNum = 0;
ctx.moveTo(subD, bigInt);
ctx.lineTo(subD, lineNum);
ctx.moveTo(bigInt, subD);
ctx.lineTo(lineNum, subD);
}
ctx.stroke();
ctx.beginPath();
ctx.globalAlpha = 0.5;
ctx.moveTo(curD, bigInt);
ctx.lineTo(curD, 0);
ctx.moveTo(bigInt, curD);
ctx.lineTo(0, curD);
ctx.stroke();
const datauri = hcanvas.toDataURL('image/png');
gridimg.setAttribute('width', bigInt);
gridimg.setAttribute('height', bigInt);
gridimg.parentNode.setAttribute('width', bigInt);
gridimg.parentNode.setAttribute('height', bigInt);
svgCanvas.setHref(gridimg, datauri);
}
/**
*
* @returns {undefined}
*/
function gridUpdate () {
if (showGrid) {
updateGrid(svgCanvas.getZoom());
}
$('#canvasGrid').toggle(showGrid);
$('#view_grid').toggleClass('push_button_pressed tool_button');
}
const buttons = [{
id: 'view_grid',
icon: svgEditor.curConfig.extIconsPath + 'grid.png',
type: 'context',
panel: 'editor_panel',
events: {
click () {
svgEditor.curConfig.showGrid = showGrid = !showGrid;
gridUpdate();
}
}
}];
return {
name: strings.name,
svgicons: svgEditor.curConfig.extIconsPath + 'grid-icon.xml',
zoomChanged (zoom) {
if (showGrid) { updateGrid(zoom); }
},
callback () {
if (showGrid) {
gridUpdate();
}
},
buttons: strings.buttons.map((button, i) => {
return Object.assign(buttons[i], button);
})
};
}
};