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<h1 class="page-title">Source: Rulers.js</h1>
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<pre class="prettyprint source linenums"><code>import rulersTemplate from './templates/rulersTemplate.html'
import SvgCanvas from '@svgedit/svgcanvas'
const { $id, getTypeMap } = SvgCanvas
/**
*
*/
class Rulers {
/**
* @type {Module}
*/
constructor (editor) {
// Make [1,2,5] array
this.rulerIntervals = []
for (let i = 0.1; i < 1e5; i *= 10) {
this.rulerIntervals.push(i)
this.rulerIntervals.push(2 * i)
this.rulerIntervals.push(5 * i)
}
this.svgCanvas = editor.svgCanvas
this.editor = editor
// add rulers component to the DOM
const template = document.createElement('template')
template.innerHTML = rulersTemplate
this.editor.$svgEditor.append(template.content.cloneNode(true))
const { $id } = 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.getSvgContent()
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 $hcanvOrig = $id('ruler_' + dim).querySelector('canvas')
// Bit of a hack to fully clear the canvas in Safari & IE9
const $hcanv = $hcanvOrig.cloneNode(true)
$hcanvOrig.replaceWith($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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