Smoothed D3.js Radar Chart
This example presents a smoothed radar chart that compares three smartphone brands—iPhone, Samsung, and Nokia—across eight attributes such as battery life, brand, and price. The visualization uses a circular grid with five concentric levels, where each brand’s data forms a rounded, semi-transparent polygon with colored strokes and dots. Built with D3.js (version 3.5.6), it renders via SVG and includes a glow filter for aesthetic effect. The chart animates using smooth cardinal-closed paths, with tooltips and percentage labels marking each level.