Class Summary Class Description AbstractHeatmapOverlayAncestor for heatmap image overlays. AbstractPositionableHeatmapOverlayAncestor for overlays that can be positioned on the heatmap panel. AbstractPositionableHeatmapOverlayWithDimensionsAncestor for overlays that can be positioned on the heatmap panel and support dimensions. AbstractSingleColorHeatmapOverlayAncestor for overlays that just use a single color. CentroidPaints the centroid's location over the heatmap image. HighestTemperatureOverlays the heatmap with the points that have the highest temperature. LowestTemperatureOverlays the heatmap with the points that have the lowest temperature. NullDummy overlay, does nothing. TextOverlayDisplays text as overlay, either the fixed text, or if empty, a report value.