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<h1 class="page-title">Source: editor/Rulers.js</h1>
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<pre class="prettyprint source linenums"><code>import { getTypeMap } from '../common/units.js';
import rulersTemplate from './templates/rulersTemplate.js';
/**
*
*/
class Rulers {
/**
* @type {Module}
*/
constructor (editor) {
// Make [1,2,5] array
this.rulerIntervals = [];
for (let i = 0.1; i < 1e5; i *= 10) {
this.rulerIntervals.push(i);
this.rulerIntervals.push(2 * i);
this.rulerIntervals.push(5 * i);
}
this.svgCanvas = editor.svgCanvas;
this.editor = editor;
// add rulers component to the DOM
this.editor.$svgEditor.append(rulersTemplate.content.cloneNode(true));
const { $id } = this.svgCanvas;
this.rulerX = $id('ruler_x');
this.rulerY = $id('ruler_y');
this.rulerCorner = $id('ruler_corner');
}
display (on) {
if (on) {
this.rulerX.style.removeProperty('display');
this.rulerY.style.removeProperty('display');
this.rulerCorner.style.removeProperty('display');
} else {
this.rulerX.style.display = 'none';
this.rulerY.style.display = 'none';
this.rulerCorner.style.display = 'none';
}
}
/**
* @type {Module}
*/
manageScroll () {
if (this.rulerX) this.rulerX.scrollLeft = this.editor.workarea.scrollLeft;
if (this.rulerY) this.rulerY.scrollTop = this.editor.workarea.scrollTop;
}
/**
*
* @param {HTMLDivElement} [scanvas]
* @param {Float} [zoom]
* @returns {void}
*/
updateRulers (scanvas, zoom) {
if (!zoom) { zoom = this.svgCanvas.getZoom(); }
if (!scanvas) { scanvas = document.getElementById('svgcanvas'); }
let d; let i;
const limit = 30000;
const contentElem = this.svgCanvas.getContentElem();
const units = getTypeMap();
const unit = units[this.editor.configObj.curConfig.baseUnit]; // 1 = 1px
// draw x ruler then y ruler
for (d = 0; d < 2; d++) {
const isX = (d === 0);
const dim = isX ? 'x' : 'y';
const lentype = isX ? 'width' : 'height';
const contentDim = Number(contentElem.getAttribute(dim));
const { $id } = this.svgCanvas;
const $hcanvOrig = $id('ruler_' + dim).querySelector('canvas');
// Bit of a hack to fully clear the canvas in Safari & IE9
const $hcanv = $hcanvOrig.cloneNode(true);
// eslint-disable-next-line no-unsanitized/property
$hcanvOrig.replaceWith($hcanv);
const hcanv = $hcanv;
// Set the canvas size to the width of the container
let rulerLen;
if(lentype === 'width'){
rulerLen = parseFloat(getComputedStyle(scanvas, null).width.replace("px", ""));
} else if(lentype === 'height'){
rulerLen = parseFloat(getComputedStyle(scanvas, null).height.replace("px", ""));
}
const totalLen = rulerLen;
hcanv.parentNode.style[lentype] = totalLen + 'px';
let ctx = hcanv.getContext('2d');
let ctxArr; let num; let ctxArrNum;
ctx.fillStyle = 'rgb(200,0,0)';
ctx.fillRect(0, 0, hcanv.width, hcanv.height);
// Remove any existing canvasses
const elements = Array.prototype.filter.call($hcanv.parentNode.children, function(child){
return child !== $hcanv;
});
Array.from(elements).forEach(function(element) {
element.remove();
});
// Create multiple canvases when necessary (due to browser limits)
if (rulerLen >= limit) {
ctxArrNum = Number.parseInt(rulerLen / limit) + 1;
ctxArr = [];
ctxArr[0] = ctx;
let copy;
for (i = 1; i < ctxArrNum; i++) {
hcanv[lentype] = limit;
copy = hcanv.cloneNode(true);
hcanv.parentNode.append(copy);
ctxArr[i] = copy.getContext('2d');
}
copy[lentype] = rulerLen % limit;
// set copy width to last
rulerLen = limit;
}
hcanv[lentype] = rulerLen;
const uMulti = unit * zoom;
// Calculate the main number interval
const rawM = 50 / uMulti;
let multi = 1;
for (i = 0; i < this.rulerIntervals.length; i++) {
num = this.rulerIntervals[i];
multi = num;
if (rawM <= num) {
break;
}
}
const bigInt = multi * uMulti;
ctx.font = '9px sans-serif';
let rulerD = ((contentDim / uMulti) % multi) * uMulti;
let labelPos = rulerD - bigInt;
// draw big intervals
let ctxNum = 0;
while (rulerD < totalLen) {
labelPos += bigInt;
// const realD = rulerD - contentDim; // Currently unused
const curD = Math.round(rulerD) + 0.5;
if (isX) {
ctx.moveTo(curD, 15);
ctx.lineTo(curD, 0);
} else {
ctx.moveTo(15, curD);
ctx.lineTo(0, curD);
}
num = (labelPos - contentDim) / uMulti;
let label;
if (multi >= 1) {
label = Math.round(num);
} else {
const decs = String(multi).split('.')[1].length;
label = num.toFixed(decs);
}
// Change 1000s to Ks
if (label !== 0 && label !== 1000 && label % 1000 === 0) {
label = (label / 1000) + 'K';
}
if (isX) {
ctx.fillText(label, rulerD + 2, 8);
} else {
// draw label vertically
const str = String(label).split('');
for (i = 0; i < str.length; i++) {
ctx.fillText(str[i], 1, (rulerD + 9) + i * 9);
}
}
const part = bigInt / 10;
// draw the small intervals
for (i = 1; i < 10; i++) {
let subD = Math.round(rulerD + part * i) + 0.5;
if (ctxArr && subD > rulerLen) {
ctxNum++;
ctx.stroke();
if (ctxNum >= ctxArrNum) {
i = 10;
rulerD = totalLen;
continue;
}
ctx = ctxArr[ctxNum];
rulerD -= limit;
subD = Math.round(rulerD + part * i) + 0.5;
}
// odd lines are slighly longer
const lineNum = (i % 2) ? 12 : 10;
if (isX) {
ctx.moveTo(subD, 15);
ctx.lineTo(subD, lineNum);
} else {
ctx.moveTo(15, subD);
ctx.lineTo(lineNum, subD);
}
}
rulerD += bigInt;
}
ctx.strokeStyle = '#000';
ctx.stroke();
}
}
}
export default Rulers;
</code></pre>
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