[Bug] Heatmap layer does not work for negative weights

[lukeellison]

Description

There is no way to currently use the Heatmap layer with negative values for weights. Things I've tried:

• Threshold: 0
• Threshold: any negative number
• ColorDomain: [negative numbers, postive numbers]

If you try the above the areas where the heatmap would have a negative value are cut off. Potentially it is calculating the right weight through the sum of the values but can't apply it to the colourRange correctly.

Flavors

• [ ] Script tag
• [X] React
• [ ] Python/Jupyter notebook
• [ ] MapboxOverlay
• [ ] GoogleMapsOverlay
• [ ] CartoLayer
• [ ] ArcGIS

Expected Behavior

Very negative values appear at the bottom of the colorRange on the heatmap, very positive values at the top.

Steps to Reproduce

1. Make a Heatmap layer over a map
2. Have data points with negative weights at a position. e.g.

{
 lonlat: [1, 2],
 score: -0.5
}

3. getWeight: d => d.score,
4. observe

Environment

• Framework version: "deck.gl": "^9.0.27",
• Browser: Brave Version 1.66.115 Chromium: 125.0.6422.112 (Official Build) (arm64)
• OS: Mac OS Version 14.0

Logs

No response