vizzu
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Vizzu is a free, open-source Javascript/C++ library utilizing a generic dataviz engine that generates many types of charts and seamlessly animates between them. It can be used to create static charts but more importantly it is designed for building animat
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JavaScript
class Render{init(e,t,r){this.polygonFirstPoint=!1,this.offscreenCanvas=document.createElement("CANVAS"),this.offscreenContext=this.offscreenCanvas.getContext("2d"),this.update=e,this.mainCanvas=t,this.mainCanvas.font="Roboto Condensed",this.mainCanvas.textAlign="left",this.mainCanvas.textBaseline="top",this.context=t.getContext("2d"),this.log=r,this.updateCanvasSize(),this.prevUpdateHash=""}canvas(){return this.mainCanvas}dc(){return this.offscreenContext}clientRect(){return this.mainCanvas.getBoundingClientRect()}frameBegin(){this.currentLineWidth=1,this.offscreenContext.clearRect(-1,-1,this.mainCanvas.width+1,this.mainCanvas.height+1)}frameEnd(){this.context.clearRect(-1,-1,this.mainCanvas.width+1,this.mainCanvas.height+1),this.context.drawImage(this.offscreenCanvas,0,0)}lineWidthNotification(e){this.currentLineWidth=e}noneZeroLineWidth(){return 0!==this.currentLineWidth}startPolygonNotification(){var e=this.polygonFirstPoint;return this.polygonFirstPoint=!0,!e}endPolygonNotification(){this.polygonFirstPoint=!1}updateCanvasSize(){this.scaleFactor=window.devicePixelRatio,this.cssWidth=+getComputedStyle(this.mainCanvas).width.slice(0,-2),this.cssHeight=+getComputedStyle(this.mainCanvas).height.slice(0,-2);var e=`${this.scaleFactor}:${this.cssWidth}:`+this.cssHeight;e!==this.prevUpdateHash&&(this.mainCanvas.width=this.cssWidth*this.scaleFactor,this.mainCanvas.height=this.cssHeight*this.scaleFactor,this.offscreenCanvas.width=this.cssWidth*this.scaleFactor,this.offscreenCanvas.height=this.cssHeight*this.scaleFactor,this.offscreenContext.translate(.5,.5),this.offscreenContext.scale(this.scaleFactor,this.scaleFactor)),this.prevUpdateHash=e}updateFrame(e){var t=performance.now(),e=(this.updateCanvasSize(),0<this.mainCanvas.width&&0<this.mainCanvas.height&&this.update(this.scaleFactor,this.cssWidth,this.cssHeight,e),performance.now()-t);this.log&&1<e&&console.log("Render.updateFrame: "+e.toFixed(2)+"ms")}}class Events{constructor(e){this.vizzu=e,this.module=e.module,this.eventHandlers=new Map}add(e,t){if(e!==""+e)throw new Error("first parameter should be string");e=this.vizzu.toCString(e);try{var r=this.vizzu.call(this.module._addEventListener)(e);this.eventHandlers.set(r,t)}finally{this.module._free(e)}}remove(e,n){var t=this.vizzu.toCString(e);if(e!==""+e)throw new Error("first parameter should be string");try{if(n){let r=null;if(this.eventHandlers.forEach((e,t)=>{e===n&&(r=t)}),null===r)throw new Error("unknown event handler");this.vizzu.call(this.module._removeEventListener)(t,r)}else this.vizzu.call(this.module._removeEventListener)(t,0)}finally{this.eventHandlers.delete(n),this.module._free(t)}}invoke(t,r){try{if(this.eventHandlers.has(t)){let e=JSON.parse(this.vizzu.fromCString(r));e.preventDefault=()=>{this.vizzu.call(this.module._event_preventDefault)()},e.event.endsWith("-draw")&&(e.renderingContext=this.vizzu.render.dc()),this.eventHandlers.get(t)(e)}}catch(e){console.log("exception in event handler: "+e)}}}const assert=(e,t)=>{if(!e)throw new Error("Assert failed: "+t)},assertArray=(t,e,r)=>{assert(Array.isArray(e),"array is not a list");try{if(e.length!==t.dimensions[r].values.length)throw new Error("Assert failed")}catch(e){assert(!1,"dimensions are not the same")}e.forEach(e=>{Array.isArray(e)&&assertArray(t,e,r-1)})};class UnPivot{static isPivot(e){return void 0!==e?.dimensions||void 0!==e?.measures}static convert(i){assert("object"==typeof i&&null!==i&&!Array.isArray(i),"data is not an object"),assert("dimensions"in i,"data.dimensions is requreid"),assert("measures"in i,"data.measures is requreid"),i.series=[];let a=1;assert(Array.isArray(i.dimensions),"data.dimensions is not a list");for(let e=0;e<i.dimensions.length;e++){var t=i.dimensions[e];assert("object"==typeof t&&null!==t&&!Array.isArray(t),"data.dimensions.item is not an object"),assert("name"in t,"data.dimensions.item.name is requreid"),assert(void 0===t.type||"dimension"===t.type,"data.dimensions.item.type is invalid"),assert("values"in t,"data.dimensions.item.values is requreid"),assert(Array.isArray(t.values),"data.dimensions.item.values is not a list"),assert(0!==t.values.length,"data.dimensions.item.values length is zero"),a*=t.values.length}let s=1;for(let n=0;n<i.dimensions.length;n++){let e=i.dimensions[n],t=[],r=[];e.values.forEach(t=>{for(let e=1;e<=s;e++)r.push(t)}),s*=e.values.length;for(let e=1;e<=a/s;e++)t=t.concat(r);var o={name:e.name,type:e.type||"dimension",values:t};i.series.push(o)}assert("object"==typeof i.measures&&null!==i.measures,"data.measures is not a list or an object"),Array.isArray(i.measures)||(i.measures=[i.measures]);for(let r=0;r<i.measures.length;r++){let e=i.measures[r],t=(assert("object"==typeof e&&null!==e&&!Array.isArray(e),"data.measures.item is not an object"),assert("name"in e,"data.measures.item.name is requreid"),assert("values"in e,"data.measures.item.values is requreid"),assert(Array.isArray(e.values),"data.measures.item.values is not a list"),assertArray(i,e.values,i.dimensions.length-1),{name:e.name,type:e.type,values:e.values.flat(1/0)});void 0===t.type&&delete t.type,assert(t.values.length===a,"dimensions are not the same"),i.series.push(t)}}}class DataRecord{constructor(e,t){return this.chart=e,this.record=t,new Proxy(this,{get:(e,t)=>e.getValue(t)})}getValue(e){e=this.chart.toCString(e);let t,r;try{t=this.chart.call(this.chart.module._record_getValue)(this.record,e,!0),r=t?this.chart.fromCString(t):(t=this.chart.call(this.chart.module._record_getValue)(this.record,e,!1),this.chart.module.getValue(t,"double"))}finally{this.chart.module._free(e)}return r}}class Data{constructor(e){this.chart=e}set(e){if(e){if(UnPivot.isPivot(e)){if(this.is1NF(e))throw new Error("inconsistent data form: series/records and dimensions/measures are both set.");UnPivot.convert(e)}if(e.series){if(!Array.isArray(e.series))throw new Error("data series field is not an array");for(const t of e.series)this.setSeries(t)}if(e.records){if(!Array.isArray(e.records))throw new Error("data records field is not an array");for(const r of e.records)this.addRecord(r)}!e.filter&&null!==e.filter||this.setFilter(e.filter)}}addRecord(t){if(!Array.isArray(t))throw new Error("data record is not an array");let r=new Uint32Array(t.length);for(let e=0;e<t.length;e++){var n=this.chart.toCString(String(t[e]).toString());r[e]=n}var e=4*t.length,i=this.chart.module._malloc(e);new Uint8Array(this.chart.module.HEAPU8.buffer,i,e).set(new Uint8Array(r.buffer));try{this.chart.call(this.chart.module._data_addRecord)(i,t.length)}finally{for(var a of r)this.chart.module._free(a);this.chart.module._free(i)}}setSeries(e){if(!e.name)throw new Error("missing series name");if(e.values||(e.values=[]),e.type||(e.type=this.detectType(e.values)),"dimension"===e.type)this.addDimension(e.name,e.values);else{if("measure"!==e.type)throw new Error("invalid series type: "+e.type);this.addMeasure(e.name,e.values)}}detectType(e){if(Array.isArray(e)&&e.length){if("number"==typeof e[0])return"measure";if(e[0]===""+e[0])return"dimension"}return null}addDimension(e,t){if("string"!=typeof e&&!(e instanceof String))throw new Error("first parameter should be string");if(!(t instanceof Array))throw new Error("second parameter should be an array");let r=new Uint32Array(t.length);for(let e=0;e<t.length;e++){if("string"!=typeof t[e]&&!(t[e]instanceof String))throw new Error("array element should be string");var n=this.chart.toCString(t[e]);r[e]=n}var i=4*t.length,a=this.chart.module._malloc(i),i=(new Uint8Array(this.chart.module.HEAPU8.buffer,a,i).set(new Uint8Array(r.buffer)),this.chart.toCString(e));try{this.chart.call(this.chart.module._data_addDimension)(i,a,t.length)}finally{this.chart.module._free(i);for(var s of r)this.chart.module._free(s);this.chart.module._free(a)}}addMeasure(e,t){if("string"!=typeof e&&!(e instanceof String))throw new Error("first parameter should be string");if(!(t instanceof Array))throw new Error("second parameter should be an array");var r=new Float64Array(t),n=8*t.length,i=this.chart.module._malloc(n),n=(new Uint8Array(this.chart.module.HEAPU8.buffer,i,n).set(new Uint8Array(r.buffer)),this.chart.toCString(e));try{this.chart.call(this.chart.module._data_addMeasure)(n,i,t.length)}finally{this.chart.module._free(n),this.chart.module._free(i)}}setFilter(t){if("function"==typeof t){var e=this.chart.module.addFunction(e=>t(new DataRecord(this.chart,e)),"ii");this.chart.call(this.chart.module._chart_setFilter)(e)}else{if(null!==t)throw new Error("data filter is not a function or null");this.chart.call(this.chart.module._chart_setFilter)(0)}}is1NF(e){return e.series||e.records}}class AnimControl extends Promise{constructor(r,e){super((e,t)=>{r(e,t)}),this.chart=e}then(e,t){const r=super.then(e,t);return r.chart=this.chart,r}get[Symbol.toStringTag](){return"AnimControl"}seek(e){return this.animControl("seek",e),this}pause(){return this.animControl("pause"),this}play(){return this.animControl("play"),this}stop(){return this.animControl("stop"),this}reverse(){return this.animControl("reverse"),this}animControl(e,t=""){e=this.chart.toCString(e),t=this.chart.toCString(t);try{this.chart.call(this.chart.module._anim_control)(e,t)}finally{this.chart.module._free(t),this.chart.module._free(e)}}}class Tooltip{constructor(e){this.set=!1,this.chart=e,this.id=0,this.animating=!1,this.lastMarkerId=null,this.lastMove=new Date,this.mouseMoveHandler=e=>{this.mousemove(e)},this.mouseOnHandler=e=>{this.mouseon(e)},this.enabled=!1}enable(e){e!==this.set&&(e?(this.chart.on("mousemove",this.mouseMoveHandler),this.chart.on("mouseon",this.mouseOnHandler)):(this.chart.off("mousemove",this.mouseMoveHandler),this.chart.off("mouseon",this.mouseOnHandler),this.id++,setTimeout(()=>{this.out(this.id)},200)),this.set=e)}mousemove(){this.lastMove=new Date}mouseon(e){this.id++;let t=this.id;e.data.marker?setTimeout(()=>{this.in(t,e.data.marker.id)},0):setTimeout(()=>{this.out(t)},200)}in(e,t){this.id===e&&(this.animating?setTimeout(()=>{this.in(e,t)},100):(this.lastMarkerId=t,this.animating=!0,this.chart.animate({config:{tooltip:t}},this.lastMarkerId?"100ms":"250ms").then(()=>{this.animating=!1})))}out(e){var t;this.id===e&&(t=new Date-this.lastMove,!this.animating&&200<t?(this.lastMarkerId=null,this.animating=!0,this.chart.animate({config:{tooltip:null}},"250ms").then(()=>{this.animating=!1})):setTimeout(()=>{this.out(e)},200-t))}}var VizzuModule=function(){var We=import.meta.url;return function(e){var x,L,t,u=void 0!==(e=e||{})?e:{},r=(u.ready=new Promise(function(e,t){x=e,L=t}),{});for(t in u)u.hasOwnProperty(t)&&(r[t]=u[t]);var H,n="";document.currentScript&&(n=document.currentScript.src);var n=0!==(n=We?We:n).indexOf("blob:")?n.substr(0,n.lastIndexOf("/")+1):"",j=console.log.bind(console),a=console.warn.bind(console);for(t in r)r.hasOwnProperty(t)&&(u[t]=r[t]);var s,D,o,r=null,l=[];function R(t,r){var n,i=I;if(!s){s=new WeakMap;for(var e=0;e<i.length;e++){var a=i.get(e);a&&s.set(a,e)}}if(s.has(t))return s.get(t);if(l.length)n=l.pop();else{n=i.length;try{i.grow(1)}catch(e){if(e instanceof RangeError)throw"Unable to grow wasm table. 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this.cloneObject(this.module._style_getList,this.module._style_getValue)}setConfig(r){if(null!==r&&"object"==typeof r&&Object.keys(r).forEach(e=>{["color","lightness","size","label","x","y","noop"].includes(e)&&(r.channels=r.channels||{},r.channels[e]=r[e],delete r[e])}),r?.channels){let t=r.channels;Object.keys(t).forEach(e=>{"string"==typeof t[e]&&(t[e]=[t[e]]),null!==t[e]&&!Array.isArray(t[e])||(t[e]={set:t[e]}),"string"==typeof t[e].attach&&(t[e].attach=[t[e].attach]),"string"==typeof t[e].detach&&(t[e].detach=[t[e].detach]),"string"==typeof t[e].set&&(t[e].set=[t[e].set]),Array.isArray(t[e].set)&&0===t[e].set.length&&(t[e].set=null)})}this.iterateObject(r,(e,t)=>{this.call(this.module._chart_setValue)(e,t)})}on(e,t){this._validateModule(),this.events.add(e,t)}off(e,t){this._validateModule(),this.events.remove(e,t)}store(){this._validateModule();var e=this.call(this.module._chart_store)(),t={id:e};return this.snapshotRegistry.register(t,e),t}restore(e){this._validateModule(),this.call(this.module._chart_restore)(e.id)}feature(e,t){this._validateModule(),"tooltip"===e&&this.tooltip.enable(t)}_validateModule(){if(!this.module)throw new Error("Vizzu not initialized. Use `initializing` promise.")}animate(e,t){return this.anim=this.anim.then(()=>this.animStep(e,t)),this.anim}animStep(t,e){if(t){let e=Object.assign({},t);var r;e.id?this.restore(e):(e.data||void 0!==e.style||e.config||(e={config:e}),this.data.set(e.data),null===e.style&&(e.style={"":null}),t=JSON.parse(JSON.stringify(e.style||{})),r=getCSSCustomPropsForElement(this.container,this._propPrefix),this.setStyle(propsToObject(r,t,this._propPrefix)),this.setConfig(Object.assign({},e.config)))}return this.setAnimation(e),new AnimControl(e=>{let t=this.module.addFunction(()=>{e(this),this.module.removeFunction(t)},"v");this.call(this.module._chart_animate)(t)},this)}setAnimation(e){if(void 0!==e){if(null===e?e={duration:0}:"string"!=typeof e&&"number"!=typeof e||(e={duration:e}),"object"!=typeof e)throw new Error("invalid animation option");e=Object.assign({},e),this.iterateObject(e,(e,t)=>{this.call(this.module._anim_setValue)(e,t)})}}get animation(){return this.anim}version(){this._validateModule();var e=this.module._vizzu_version();return this.module.UTF8ToString(e)}start(){this.started||(this.call(this.module._vizzu_poll)(),this.render.updateFrame(!1),setInterval(()=>{this.call(this.module._vizzu_poll)()},10),setInterval(()=>{this.render.updateFrame(!1)},25),this.started=!0)}getMousePos(e){var t=this.render.clientRect();return[e.clientX-t.left,e.clientY-t.top]}toCString(e){var t=4*e.length+1,r=this.module._malloc(t);return this.module.stringToUTF8(e,r,t),r}fromCString(e){return this.module.UTF8ToString(e)}init(e){this.module=e;e=this.createCanvas();return this.render=new Render,this.module.render=this.render,this.data=new Data(this),this.events=new Events(this),this.module.events=this.events,this.tooltip=new Tooltip(this),this.render.init(this.call(this.module._vizzu_update),e,!1),this.call(this.module._vizzu_init)(),this.call(this.module._vizzu_setLogging)(!1),this.setupDOMEventHandlers(e),this.start(),this}createCanvas(){let e=null,t=this.container;if(t instanceof HTMLCanvasElement?e=t:((e=document.createElement("CANVAS")).style.width="100%",e.style.height="100%",t.appendChild(e)),e instanceof HTMLCanvasElement)return e;throw new Error("Error initializing <canvas> for Vizzu!")}setupDOMEventHandlers(e){this.resizeObserver=new ResizeObserver(()=>{this.render.updateFrame(!0)}),this.resizeObserver.observe(e),window.addEventListener("resize",()=>{this.render.updateFrame(!0)}),e.addEventListener("mousemove",e=>{e=this.getMousePos(e);this.call(this.module._vizzu_mouseMove)(e[0],e[1])}),e.addEventListener("mouseup",e=>{e=this.getMousePos(e);this.call(this.module._vizzu_mouseUp)(e[0],e[1])}),e.addEventListener("mousedown",e=>{e=this.getMousePos(e);this.call(this.module._vizzu_mouseDown)(e[0],e[1])}),e.addEventListener("mouseout",()=>{this.call(this.module._vizzu_mouseLeave)()}),e.addEventListener("wheel",e=>{this.call(this.module._vizzu_mousewheel)(e.deltaY)}),document.addEventListener("keydown",t=>{let r=t.keyCode<=255?t.keyCode:0;var n=[33,34,36,35,37,39,38,40,27,9,13,46];for(let e=0;e<n.length;e++)t.key===n[e]&&(r=256+e);0!==r&&this.call(this.module._vizzu_keyPress)(r,t.ctrlKey,t.altKey,t.shiftKey)})}}export default Vizzu;