colorRamp function

string colorRamp(gradient, value)

gradient string

"whiteToBlack", "greenToRed", "yellowToRed", "redToBlue", "orangeToBlue", "brownToBlue", "spectrum"

Different color ramp presets.

value float A value between 0 and 1.

Returns a hexadecimal color value from a color ramp (selected with gradient) according to the given value. Means the value is mapped on the color ramp and the corresponding color is returned.

Examples

Yellow to red color ramp

@Range(min=0, max=1)
attr colorValue = 1

@StartRule
Shape -->
    color ( colorRamp("yellowToRed",colorValue))

To visualize datasets, 'normalize' the values to the [0-1] range with the function " x_norm = 1 / (max - min) * (x - min) ".

Ramp example images based on a GIS dataset

yellow to red color ramp — yellow to red :

green to red color ramp — green to red :

white to black color ramp — white to black :

orange to blue color ramp — orange to blue :

brown to blue color ramp — brown to blue :