Fork of d3 and canvas - the bind, the draw and the pick

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Fork of d3 and canvas - the bind, the draw and the pick

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Last edited Apr 24, 2022

Created on Apr 24, 2022

Forked from d3 and canvas - the bind, the draw and the pick

This example demonstrates a grid of colored rectangles, where each cell represents a data point and its color is mapped from its value using a spectral color scale. The visualization implements a picking mechanism for canvas-based interactivity by assigning each rectangle a unique, hidden color stored in a separate off-screen canvas. Using D3 v4, the code binds data to custom elements, then draws the visible grid with animations, while the hidden canvas enables precise hit-testing through color lookup, demonstrated with a tooltip.

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A bare minimum HTML page demonstrating use of CSS and JavaScript.

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