140 lines
4.3 KiB
JavaScript
140 lines
4.3 KiB
JavaScript
import { Parser, HtmlRenderer } from 'commonmark'
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import Visualize from './Visualize'
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const Util = {
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// helper function to determine how many lines are needed
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// Line Splitter Function
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// copyright Stephen Chapman, 19th April 2006
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// you may copy this code but please keep the copyright notice as well
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splitLine: function (st, n) {
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var b = ''
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var s = st ? st : ''
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while (s.length > n) {
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var c = s.substring(0, n)
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var d = c.lastIndexOf(' ')
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var e = c.lastIndexOf('\n')
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if (e != -1) d = e
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if (d == -1) d = n
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b += c.substring(0, d) + '\n'
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s = s.substring(d + 1)
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}
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return b + s
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},
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nowDateFormatted: function () {
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var date = new Date(Date.now())
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var month = (date.getMonth() + 1) < 10 ? '0' + (date.getMonth() + 1) : (date.getMonth() + 1)
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var day = date.getDate() < 10 ? '0' + date.getDate() : date.getDate()
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var year = date.getFullYear()
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return month + '/' + day + '/' + year
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},
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decodeEntities: function (desc) {
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var str, temp = document.createElement('p')
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temp.innerHTML = desc // browser handles the topics
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str = temp.textContent || temp.innerText
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temp = null // delete the element
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return str
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}, // decodeEntities
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getDistance: function (p1, p2) {
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return Math.sqrt(Math.pow((p2.x - p1.x), 2) + Math.pow((p2.y - p1.y), 2))
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},
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coordsToPixels: function (coords) {
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if (Visualize.mGraph) {
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var canvas = Visualize.mGraph.canvas,
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s = canvas.getSize(),
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p = canvas.getPos(),
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ox = canvas.translateOffsetX,
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oy = canvas.translateOffsetY,
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sx = canvas.scaleOffsetX,
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sy = canvas.scaleOffsetY
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var pixels = {
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x: (coords.x / (1 / sx)) + p.x + s.width / 2 + ox,
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y: (coords.y / (1 / sy)) + p.y + s.height / 2 + oy
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}
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return pixels
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} else {
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return {
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x: 0,
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y: 0
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}
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}
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},
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pixelsToCoords: function (pixels) {
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var coords
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if (Visualize.mGraph) {
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var canvas = Visualize.mGraph.canvas,
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s = canvas.getSize(),
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p = canvas.getPos(),
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ox = canvas.translateOffsetX,
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oy = canvas.translateOffsetY,
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sx = canvas.scaleOffsetX,
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sy = canvas.scaleOffsetY
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coords = {
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x: (pixels.x - p.x - s.width / 2 - ox) * (1 / sx),
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y: (pixels.y - p.y - s.height / 2 - oy) * (1 / sy),
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}
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} else {
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coords = {
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x: 0,
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y: 0
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}
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}
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return coords
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},
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getPastelColor: function () {
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var r = (Math.round(Math.random() * 127) + 127).toString(16)
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var g = (Math.round(Math.random() * 127) + 127).toString(16)
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var b = (Math.round(Math.random() * 127) + 127).toString(16)
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return Util.colorLuminance('#' + r + g + b, -0.4)
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},
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// darkens a hex value by 'lum' percentage
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colorLuminance: function (hex, lum) {
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// validate hex string
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hex = String(hex).replace(/[^0-9a-f]/gi, '')
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if (hex.length < 6) {
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hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2]
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}
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lum = lum || 0
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// convert to decimal and change luminosity
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var rgb = '#', c, i
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for (i = 0; i < 3; i++) {
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c = parseInt(hex.substr(i * 2, 2), 16)
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c = Math.round(Math.min(Math.max(0, c + (c * lum)), 255)).toString(16)
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rgb += ('00' + c).substr(c.length)
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}
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return rgb
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},
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generateOptionsList: function (data) {
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var newlist = ''
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for (var i = 0; i < data.length; i++) {
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newlist = newlist + '<option value="' + data[i]['id'] + '">' + data[i]['1'][1] + '</option>'
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}
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return newlist
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},
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checkURLisImage: function (url) {
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// when the page reloads the following regular expression will be screwed up
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// please replace it with this one before you save: /*backslashhere*.(jpeg|jpg|gif|png)$/
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return (url.match(/\.(jpeg|jpg|gif|png)$/) != null)
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},
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checkURLisYoutubeVideo: function (url) {
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return (url.match(/^https?:\/\/(?:www\.)?youtube.com\/watch\?(?=[^?]*v=\w+)(?:[^\s?]+)?$/) != null)
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},
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mdToHTML: text => {
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// use safe: true to filter xss
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return new HtmlRenderer({ safe: true })
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.render(new Parser().parse(text))
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},
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logCanvasAttributes: function(canvas){
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return {
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scaleX: canvas.scaleOffsetX,
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scaleY: canvas.scaleOffsetY,
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centreCoords: Util.pixelsToCoords({ x: canvas.canvases[0].size.width / 2, y: canvas.canvases[0].size.height / 2 }),
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};
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}
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}
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export default Util
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