This example animates a Craig retroazimuthal world map projection, cycling its central parallel between -25 and 25 degrees to show how the graticule’s shapes warp. It renders the graticule as colored lines on a Canvas using d3.geo.craig() and d3.geo.path() with a canvas context. Meridians and parallels are drawn separately with hues derived from their coordinates, while d3.timer drives the animation and clears the canvas each frame. The code includes d3.geo.projection.v0 and d3.v3.