12.1.5.3. Contourlines 2D plot

This demo shows how to display contour lines in an itom.plot2.

The contour levels can be set via the contourLevels property. The expected type is a dataObject of shape 1 x N of type uint8, int8, uint16, int16, int32, float32 or float64. The line width and color map can be adjusted by setting the property contourLineWidth and contourColorMap respectively.

import numpy as np
from itom import dataObject
from itom import plot

vec = np.linspace(-500, 501, 1001)
x, y = np.meshgrid(vec, vec)
r = np.sqrt(x ** 2 + y ** 2)

[idx, handle] = plot(r)
levels = dataObject.randN([1, 3], "uint8")
levels[0, 0] = 50
levels[0, 1] = 75
levels[0, 2] = 250

handle["contourLevels"] = levels
handle["contourColorMap"] = "hotIron"
handle["contourLineWidth"] = 5