Diverging Color Scale
Diverging Color Scale
Use this when: You need to replace the default blue-to-orange continuous color gradient with a diverging red-white-blue scale, the conventional choice for a value that reads as “above/below a midpoint” rather than a plain low-to-high range.
Usage
from canvas.color import Color
from dataviz import Plot, save
from dataviz.core.theme import Theme
def main() raises:
var x: List[Float64] = [1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0]
var y: List[Float64] = [12.0, 18.0, 15.0, 22.0, 19.0, 25.0, 21.0, 28.0]
var temp_anomaly: List[Float64] = [
-1.8,
-0.6,
-1.2,
0.4,
1.5,
-0.2,
0.9,
2.1,
]
var plot = (
Plot()
.mark_point()
.encode(x=x, y=y, color=temp_anomaly)
.labels(
title="Readings by Temperature Anomaly",
subtitle="Deviation from the 30-year average, °C",
)
.theme(
Theme(
color_scale_low=Color(30, 60, 180),
color_scale_mid=Color(245, 245, 245),
color_scale_high=Color(190, 30, 30),
)
)
)
save(plot, "docs/src/examples/out_diverging_color_scale.svg")Related
Related recipes: Color Map · Diverging Bar (Positive/Negative Color)