pub fn make_heatmap(
ctx: &mut EventCtx<'_>,
batch: &mut GeomBatch,
bounds: &Bounds,
pts: Vec<Pt2D>,
opts: &HeatmapOptions
) -> Widget
pub fn make_heatmap(
ctx: &mut EventCtx<'_>,
batch: &mut GeomBatch,
bounds: &Bounds,
pts: Vec<Pt2D>,
opts: &HeatmapOptions
) -> Widget