# Showcase

The flagship XWUIChartRegression demo. It walks three fit shapes (tight residuals, loose residuals, negative slope), the four block presets, the sm/md/lg size scale, the independent axis and grid toggles, trend line weight, dash and colour, and two real-world fits (ad spend against sales, floor area against price) with the value-label, interactive and loading states.

The renderer fits an ordinary least squares line to the first series and shades a 95% band from the residual standard error, so every cloud here uses numeric x values. All points are generated by a seeded inline generator, and every colour resolves from a theme token.