The author shares an interactive tutorial on line drawing using D3.js v4, focusing on implementing diagrams using SVG, interactive elements, and draggable handles. The tutorial includes steps for linear interpolation of numbers and points, the number of steps in the line, and snapping to the grid. A unique element is the explanation of making interactive elements interactive, letting readers change inputs to see outputs. The author emphasizes the need for JavaScript, SVG, and HTML knowledge to follow the tutorial. The tutorial aims to guide readers in creating their own interactive diagrams.
https://www.redblobgames.com/making-of/line-drawing/