Panzoom Camera

Example showing orbit camera controller.

Press ‘s’ to save the state, and press ‘l’ to load the last saved state.

import imageio.v3 as iio
from wgpu.gui.auto import WgpuCanvas, run
import pygfx as gfx
import numpy as np


canvas = WgpuCanvas()
renderer = gfx.renderers.WgpuRenderer(canvas)
scene = gfx.Scene()

axes = gfx.AxesHelper(size=250)
scene.add(axes)

dark_gray = np.array((169, 167, 168, 255)) / 255
light_gray = np.array((100, 100, 100, 255)) / 255
background = gfx.Background(None, gfx.BackgroundMaterial(light_gray, dark_gray))
scene.add(background)

im = iio.imread("imageio:astronaut.png")
tex = gfx.Texture(im, dim=2)
geometry = gfx.plane_geometry(512, 512)
material = gfx.MeshBasicMaterial(map=tex)
plane = gfx.Mesh(geometry, material)
scene.add(plane)

camera = gfx.OrthographicCamera(512, 512)
camera.show_object(scene)
controller = gfx.PanZoomController(camera, register_events=renderer)


def on_key_down(event):
    if event.key == "s":
        controller.save_state()
    elif event.key == "l":
        controller.load_state()
    elif event.key == "r":
        controller.show_object(camera, plane)


renderer.add_event_handler(on_key_down, "key_down")


if __name__ == "__main__":
    canvas.request_draw(lambda: renderer.render(scene, camera))
    run()