RS-22278: Fix Values color option error when values are all identical#14
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GetVectorOfColors normalized color.values via (vals - min) / max(vals - min). When every value is the same the range is zero, so this computes 0/0 = NaN, which colorRamp propagates and rgb() rejects with "color intensity NA, not in 0:255". Guard the zero-range case and map all values to the midpoint of the color scale (0.5) instead. For the reported 3-colour custom palette this resolves to the middle colour, matching the expected result. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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GetVectorOfColors normalized color.values via (vals - min) / max(vals - min). When every value is the same the range is zero, so this computes 0/0 = NaN, which colorRamp propagates and rgb() rejects with "color intensity NA, not in 0:255".
Guard the zero-range case and map all values to the midpoint of the color scale (0.5) instead. For the reported 3-colour custom palette this resolves to the middle colour, matching the expected result.