{"version":"1.0","type":"rich","title":"Custom Shape Tweening","description":"This example demonstrates smooth transitions between custom polygons in D3 v4, addressing limitations in Mike Bostock’s original shape tweening approach. The visualization morphs between a California-shaped polygon and other custom polygons by aligning starting points, matching point counts, and ensuring consistent orientation. Using `d3.polygonArea()` to verify winding direction and a hidden SVG path to proportionally resample points, it produces clean, predictable shape transformations. The animation is rendered in SVG, with each shape transitioning seamlessly to the next in an animated loop.","provider_name":"VizHub AI Studio","provider_url":"https://next.vizhub.com","html":"<iframe src=\"https://next.vizhub.com/viz/gist-06cf037853999219cd82bc79edc4aee6?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"1\"></iframe>","width":960,"height":500,"cache_age":3600}