colorRamp

Syntax

string colorRamp(gradient, value)

Parameters

gradient (string)

"whiteToBlack", "greenToRed", "yellowToRed", "redToBlue", "orangeToBlue", "brownToBlue", "spectrum" Different color ramp presets.
value (float)
A value between 0 and 1.

Returns

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 :

red to blue :

green to red :

white to black :

orange to blue :

brown to blue :

spectrum :