Useful Javascript Array functions.SVG cheat sheetD3: IntroducingScales and AxesUseful D3 Functions for Data handlingWeek 2, TuesdayclipPath and textPathUS Baby NamesData Fetch and Meta dataWeek 3Week 4: Getting Started With InteractionWeb Scraping Table data from HTML file.Fetch Covid-19 dataWeek 5Week 8: HierarchiesCircle PackingTreemapGraph LayoutWeek 6Week 7: TuesdayInteraction in d3 Canvas based Scatter PlotsGeoVisualization using D3TopoJSON and GeoVisualizationMore d3 Scale functions and InterpolationsColor from Wavelength, Correlated Temperature and HTML color pickerHSV and HSL Color ModelsMore on d3 join()Final Projects
Drawing Axis in d3 Canvas
data = generateRandomData(100)
margin = ({ left: 25, right: 25, top: 25, bottom: 25 })
xRange = [margin.left, width - margin.right]
xScale.ticks()
xScale.ticks(20) // The count parameter is only a hint
xScale.tickFormat()
md`### Draw Axis Bottom`
drawXaxis = (context, xScale, Y, xExtent) => {
const [startX, endX] = xExtent;
let tickSize = 6,
xTicks = xScale.ticks(), // You may choose tick counts. ex: xScale.ticks(20)
xTickFormat = xScale.tickFormat(); // you may choose the format. ex: xScale.tickFormat(tickCount, ".0s")
context.strokeStyle = "black";
context.beginPath();
xTicks.forEach(d => {
context.moveTo(xScale(d), Y);
context.lineTo(xScale(d), Y + tickSize);
});
context.stroke();
context.beginPath();
context.moveTo(startX, Y + tickSize);
context.lineTo(startX, Y);
context.lineTo(endX, Y);
context.lineTo(endX, Y + tickSize);
context.stroke();
context.textAlign = "center";
context.textBaseline = "top";
context.fillStyle = "black";
xTicks.forEach(d => {
context.beginPath();
context.fillText(xTickFormat(d), xScale(d), Y + tickSize);
});
}
md`### Draw Axis Left`
drawYaxis = (context, yScale, X, yExtent) => {
const [startY, endY] = yExtent;
const tickPadding = 3,
tickSize = 6,
yTicks = yScale.ticks(),
yTickFormat = yScale.tickFormat();
context.strokeStyle = "black";
context.beginPath();
yTicks.forEach(d => {
context.moveTo(X, yScale(d));
context.lineTo(X - tickSize, yScale(d));
});
context.stroke();
context.beginPath();
context.moveTo(X - tickSize, startY);
context.lineTo(X, startY);
context.lineTo(X, endY);
context.lineTo(X - tickSize, endY);
context.stroke();
context.textAlign = "right";
context.textBaseline = "middle";
context.fillStyle = "black";
yTicks.forEach(d => {
context.beginPath();
context.fillText(yTickFormat(d), X - tickSize - tickPadding, yScale(d));
});
}
generateRandomData()
md`## External Libraries and Imports`
d3 = require("d3@6")
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
