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/*****************************************************************
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** Author: Asvin Goel, goel@telematique.eu
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** Fixed for Reveal4: kotborealis@awooo.ru
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**
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** A plugin for reveal.js allowing to integrate Chart.js
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**
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** Version: 1.3.1
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**
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** License: MIT license (see LICENSE.md)
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**
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******************************************************************/
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/**
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* Reveal Plugin
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* https://revealjs.com/creating-plugins/
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*/
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window.RevealChart = window.RevealChart || {
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id: 'RevealChart',
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init: function(deck) {
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initChart(deck);
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},
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update: function(canvas, idx, data) { update(canvas, idx, data); },
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};
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const initChart = function(Reveal){
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function parseJSON(str) {
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var json;
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try {
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json = JSON.parse(str);
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} catch (e) {
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return null;
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}
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return json;
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}
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/*
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* Recursively merge properties of two objects
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*/
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function mergeRecursive(obj1, obj2) {
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for (var p in obj2) {
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try {
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// Property in destination object set; update its value.
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if ( obj1[p] !== null && typeof obj1[p] === 'object' && typeof obj2[p] === 'object' ) {
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obj1[p] = mergeRecursive(obj1[p], obj2[p]);
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}
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else {
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obj1[p] = obj2[p];
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}
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} catch(e) {
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// Property in destination object not set; create it and set its value.
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obj1[p] = obj2[p];
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}
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}
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return obj1;
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}
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function createChart(canvas, CSV, comments) {
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canvas.chart = null;
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var ctx = canvas.getContext("2d");
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var chartOptions = { responsive: true, maintainAspectRatio: false };
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var chartData = { labels: null, datasets: []};
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if ( comments !== null ) for (var j = 0; j < comments.length; j++ ){
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comments[j] = comments[j].replace(/<!--/,'');
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comments[j] = comments[j].replace(/-->/,'');
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var config = parseJSON(comments[j]);
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if ( config ) {
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if ( config.data ) {
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mergeRecursive( chartData, config.data);
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}
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if ( config.options ) {
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mergeRecursive( chartOptions, config.options);
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}
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}
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}
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var lines = CSV.split('\n').filter(function(v){return v!==''});
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// if labels are not defined, get them from first line
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if ( chartData.labels === null && lines.length > 0 ) {
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chartData.labels = lines[0].split(',');
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chartData.labels.shift();
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lines.shift();
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}
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// get data values
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for (var j = 0; j < lines.length; j++ ){
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if (chartData.datasets.length <= j) chartData.datasets[j] = {};
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chartData.datasets[j].data = lines[j].split(','); //.filter(function(v){return v!==''});
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chartData.datasets[j].label = chartData.datasets[j].data[0];
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chartData.datasets[j].data.shift();
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for (var k = 0; k < chartData.datasets[j].data.length; k++ ){
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chartData.datasets[j].data[k] = Number(chartData.datasets[j].data[k]);
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}
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}
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// add chart options
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var config = chartConfig[canvas.getAttribute("data-chart")];
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if ( config ) {
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for (var j = 0; j < chartData.datasets.length; j++ ){
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for (var attrname in config) {
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if ( !chartData.datasets[j][attrname] ) {
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chartData.datasets[j][attrname] = config[attrname][j%config[attrname].length];
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}
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}
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}
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}
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canvas.chart = new Chart(ctx, { type: canvas.getAttribute("data-chart"), data: chartData, options: chartOptions });
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}
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function updateChart(canvas, idx, data) {
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canvas.chart.data.datasets[idx].data = data;
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recreateChart( canvas );
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}
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var initializeCharts = function(){
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// Get all canvases
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var canvases = document.querySelectorAll("canvas");
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for (var i = 0; i < canvases.length; i++ ){
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// check if canvas has data-chart attribute
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if ( canvases[i].hasAttribute("data-chart") ){
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var CSV = canvases[i].innerHTML.trim();
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var comments = CSV.match(/<!--[\s\S]*?-->/g);
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CSV = CSV.replace(/<!--[\s\S]*?-->/g,'').replace(/^\s*\n/gm, "")
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if ( ! canvases[i].hasAttribute("data-chart-src") ) {
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createChart(canvases[i], CSV, comments);
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}
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else {
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var canvas = canvases[i];
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var xhr = new XMLHttpRequest();
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xhr.onload = function() {
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if (xhr.readyState === 4) {
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createChart(canvas, xhr.responseText, comments);
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}
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else {
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console.warn( 'Failed to get file ' + canvas.getAttribute("data-chart-src") +". ReadyState: " + xhr.readyState + ", Status: " + xhr.status);
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}
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};
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xhr.open( 'GET', canvas.getAttribute("data-chart-src"), false );
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try {
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xhr.send();
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}
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catch ( error ) {
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console.warn( 'Failed to get file ' + canvas.getAttribute("data-chart-src") + '. Make sure that the presentation and the file are served by a HTTP server and the file can be found there. ' + error );
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}
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}
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}
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}
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}
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function recreateChart(canvas) {
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// clear data to redraw animation
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var data = canvas.chart.data.datasets;
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canvas.chart.data.datasets = [];
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canvas.chart.update();
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canvas.style.visibility = "hidden";
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setTimeout( function(canvas, data) {
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canvas.chart.data.datasets = data;
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canvas.style.visibility = "visible";
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canvas.chart.update();
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}, 500, canvas, data); // wait for slide transition to re-add data and animation
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/*
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var config = canvas.chart.config;
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canvas.chart.destroy();
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setTimeout( function() { canvas.chart = new Chart(canvas, config);}, 500); // wait for slide transition
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*/
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}
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// check if chart option is given or not
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var chartConfig = Reveal.getConfig().chart || {};
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// set global chart options
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var config = chartConfig.defaults;
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if ( config ) {
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mergeRecursive(Chart.defaults, config);
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}
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Reveal.addEventListener('ready', function(){
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initializeCharts();
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Reveal.addEventListener('slidechanged', function(){
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var canvases = Reveal.getCurrentSlide().querySelectorAll("canvas[data-chart]");
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for (var i = 0; i < canvases.length; i++ ){
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if ( canvases[i].chart && canvases[i].chart.config.options.animation !== false ) {
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recreateChart( canvases[i] );
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}
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}
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});
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});
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this.update = updateChart;
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return this;
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};
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