chart = new Chart()
.container(chartContainer)
.svgWidth(1000)
.data({message:'Hello, I am chart, seriously...'})
.render()
class Chart {
constructor() {
const attrs = {
id: "ID" + Math.floor(Math.random() * 1000000),
svgWidth: 400,
svgHeight: 400,
marginTop: 5,
marginBottom: 5,
marginRight: 5,
marginLeft: 5,
container: "body",
defaultTextFill: "#2C3E50",
defaultFont: "Helvetica",
data: null,
chartWidth: null,
chartHeight: null
};
this.getState = () => attrs;
this.setState = (d) => Object.assign(attrs, d);
Object.keys(attrs).forEach((key) => {
//@ts-ignore
this[key] = function (_) {
var string = `attrs['${key}'] = _`;
if (!arguments.length) {
return eval(`attrs['${key}'];`);
}
eval(string);
return this;
};
});
this.initializeEnterExitUpdatePattern();
}
initializeEnterExitUpdatePattern() {
d3.selection.prototype.patternify = function (params) {
var container = this;
var selector = params.selector;
var elementTag = params.tag;
var data = params.data || [selector];
var exitTransition = params.exitTransition || null;
var enterTransition = params.enterTransition || null;
// Pattern in action
var selection = container.selectAll("." + selector).data(data, (d, i) => {
if (typeof d === "object") {
if (d.id) {
return d.id;
}
}
return i;
});
if (exitTransition) {
exitTransition(selection);
} else {
selection.exit().remove();
}
const enterSelection = selection.enter().append(elementTag);
if (enterTransition) {
enterTransition(enterSelection);
}
selection = enterSelection.merge(selection);
selection.attr("class", selector);
return selection;
};
}
// ================== RENDERING ===================
render() {
this.setDynamicContainer();
this.calculateProperties();
this.drawSvgAndWrappers();
}
setDynamicContainer() {
const attrs = this.getState();
//Drawing containers
var container = d3.select(attrs.container);
var containerRect = container.node().getBoundingClientRect();
if (containerRect.width > 0) attrs.svgWidth = containerRect.width;
this.setState({ container });
}
drawSvgAndWrappers() {
const {
container,
svgWidth,
svgHeight,
defaultFont,
calc
} = this.getState();
// Draw SVG
const svg = container
.patternify({
tag: "svg",
selector: "svg-chart-container"
})
.attr("width", svgWidth)
.attr("height", svgHeight)
.attr("font-family", defaultFont);
//Add container g element
var chart = svg
.patternify({
tag: "g",
selector: "chart"
})
.attr(
"transform",
"translate(" + calc.chartLeftMargin + "," + calc.chartTopMargin + ")"
);
// REMOVE THIS SNIPPET AFTER YOU START THE DEVELOPMENT
chart
.patternify({
tag: "text",
selector: "example-text",
data: ["test"]
})
.text((d) => d)
.attr("x", 10)
.attr("y", 20);
}
calculateProperties() {
const attrs = this.getState();
//Calculated properties
var calc = {
id: null,
chartTopMargin: null,
chartLeftMargin: null,
chartWidth: null,
chartHeight: null
};
calc.id = "ID" + Math.floor(Math.random() * 1000000); // id for event handlings
calc.chartLeftMargin = attrs.marginLeft;
calc.chartTopMargin = attrs.marginTop;
const chartWidth =
attrs.svgWidth - attrs.marginRight - calc.chartLeftMargin;
const chartHeight =
attrs.svgHeight - attrs.marginBottom - calc.chartTopMargin;
this.setState({ calc, chartWidth, chartHeight });
}
updateData(data) {
const attrs = this.getChartState();
console.log("smoothly updating data");
return this;
}
}
function typescriptify(str){
return str.replace(/\t/g,' ')
.replace(/attrs\s?=/g,'attrs:any = ')
.replace(/updateData;/g,'updateData:any;')
.replace(/setExpanded;/g,'setExpanded:any;')
.replace(/setZoomFactor;/g,'setZoomFactor:any;')
.replace(/removeNode;/g,'removeNode:any;')
.replace(/addNode;/g,'addNode:any;')
.replace(/calc\s?=/g,'calc:any = ')
.replace(/\(d\)\s*\{/g,'(d:any){')
.replace(/d=>/g,'(d:any)=>')
.replace(/d =>/g,'(d:any)=>')
.replace(/ch =>/g,'(ch:any)=>')
.replace(/\(d, i\)/g,'(d:any,i:number)')
.replace(/\(s, t\)/g,'(s:any,t:any)')
.replace(/\(params\)/g,'(params:any)')
.replace(/function\(obj\)/g,'function(obj:any)')
.replace(/function\(nodeId\)/g,'function(nodeId:any)')
.replace(/function\(zoomLevel\)/g,'function(zoomLevel:number)')
.replace(/\(id, expandedFlag\)/g,'(id:any,expandedFlag:boolean)')
.replace(/\(node, flag\)/g,'(node:any,flag:boolean)')
.replace(/\(node, nodeIdsStore\)/g,'(node:any,nodeIdsStore:any[])')
.replace(/layouts\s?=/g,'layouts:any = ')
.replace(/behaviors\s?=/g,'behaviors:any = ')
.replace(/\(source\)/g,'(source:any)')
.replace(/\(\s?d\s?=>/g,'((d:any)=>')
return str;
}
d3 = require('d3')
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.