Custom axes and grid as explicit scene objects

Keywords: plotting · Axis · Grid · custom intervals

Creates a pair of axes with custom intervals, value labels, and ticks, plus a grid in the XY plane. Axes and grids are ordinary scene objects now — no hard-coded helpers.

Run

uv run python py/examples/viz/plotting/axes_custom.py

Source

viz/plotting/axes_custom.py

Code

# SPDX-License-Identifier: Apache-2.0
# Copyright 2021 Christian Perwass

"""axes_custom.py — Custom axes and grid as explicit scene objects.

Creates a pair of axes with custom intervals, value labels, and ticks,
plus a grid in the XY plane.  Axes and grids are ordinary scene objects
now — no hard-coded helpers.

Run with:  uv run python py/examples/viz/plotting/axes_custom.py

Keywords: plotting, Axis, Grid, custom intervals
"""

from pytanga.geometry import Point
from pytanga.viz import Axis, AxisStyle, Grid, LabelStyle, PointStyle, Visualizer

viz = Visualizer(
    title="Tanga — Custom Axes & Grid",
    add_default_axes=False,
    add_default_grid=False,
)

# Custom X axis: major ticks every 2 units, value labels at each major tick.
viz.new(Axis(start=(0, 0, 0), end=(10, 0, 0), major_interval=2.0, label="X"))

# Custom Y axis: major ticks every 1 unit plus minor ticks every 0.5.
viz.new(
    Axis(
        start=(0, 0, 0),
        end=(0, 6, 0),
        major_interval=1.0,
        minor_interval=0.5,
        label="Y",
    )
)

# Custom Z axis: value labels rotated -90° so they read vertically.
viz.new(
    Axis(start=(0, 0, 0), end=(0, 0, 4), major_interval=1.0, label="Z"),
    style=AxisStyle(
        value_style=LabelStyle(rotation=45, offset_2d=(0, 10)),
        label_style=LabelStyle(offset_2d=(0, 20)),
    ),
)

# Grid in the XY plane with 1-unit spacing and a 10×6 extent.
viz.new(Grid(dir_u=(1, 0, 0), dir_v=(0, 1, 0), range_u=(-5, 5), range_v=(-3, 3)))

viz.new(Point(3, 2, 0), color="#ffcc00", style=PointStyle(size=0.12), label="P")

viz.show()
viz.wait()