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_utils.py
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from typing import *
import pygfx
from pygfx import WgpuRenderer, Texture
# default auto-determined canvas
from wgpu.gui.auto import WgpuCanvas
from wgpu.gui.base import WgpuCanvasBase
# TODO: this determination can be better
try:
from wgpu.gui.jupyter import JupyterWgpuCanvas
except ImportError:
JupyterWgpuCanvas = False
try:
import PyQt6
from wgpu.gui.qt import QWgpuCanvas
except ImportError:
QWgpuCanvas = False
try:
from wgpu.gui.glfw import GlfwWgpuCanvas
except ImportError:
GlfwWgpuCanvas = False
CANVAS_OPTIONS = ["jupyter", "glfw", "qt"]
CANVAS_OPTIONS_AVAILABLE = {
"jupyter": JupyterWgpuCanvas,
"glfw": GlfwWgpuCanvas,
"qt": QWgpuCanvas,
}
def auto_determine_canvas():
try:
ip = get_ipython()
if ip.has_trait("kernel"):
if hasattr(ip.kernel, "app"):
if ip.kernel.app.__class__.__name__ == "QApplication":
return QWgpuCanvas
else:
return JupyterWgpuCanvas
except NameError:
pass
else:
if CANVAS_OPTIONS_AVAILABLE["qt"]:
return QWgpuCanvas
elif CANVAS_OPTIONS_AVAILABLE["glfw"]:
return GlfwWgpuCanvas
# We go with the wgpu auto guess
# for example, offscreen canvas etc.
return WgpuCanvas
def make_canvas_and_renderer(
canvas: Union[str, WgpuCanvas, Texture, None], renderer: [WgpuRenderer, None]
):
"""
Parses arguments and returns the appropriate canvas and renderer instances
as a tuple (canvas, renderer)
"""
if canvas is None:
Canvas = auto_determine_canvas()
canvas = Canvas(max_fps=60)
elif isinstance(canvas, str):
if canvas not in CANVAS_OPTIONS:
raise ValueError(f"str canvas argument must be one of: {CANVAS_OPTIONS}")
elif not CANVAS_OPTIONS_AVAILABLE[canvas]:
raise ImportError(
f"The {canvas} framework is not installed for using this canvas"
)
else:
canvas = CANVAS_OPTIONS_AVAILABLE[canvas](max_fps=60)
elif not isinstance(canvas, (WgpuCanvasBase, Texture)):
raise ValueError(
f"canvas option must either be a valid WgpuCanvas implementation, a pygfx Texture"
f" or a str from the following options: {CANVAS_OPTIONS}"
)
if renderer is None:
renderer = WgpuRenderer(canvas, pixel_ratio=2)
return canvas, renderer
def create_camera(
camera_type: Union[pygfx.PerspectiveCamera, str],
) -> pygfx.PerspectiveCamera:
if isinstance(camera_type, pygfx.PerspectiveCamera):
return camera_type
elif camera_type == "2d":
# use perspective for orthographic, makes it easier to then switch to controllers that make sense with fov > 0
return pygfx.PerspectiveCamera(fov=0)
elif camera_type == "3d":
return pygfx.PerspectiveCamera()
else:
raise ValueError(
"camera must be one of: '2d', '3d' or an instance of pygfx.PerspectiveCamera"
)
controller_types = {
"fly": pygfx.FlyController,
"panzoom": pygfx.PanZoomController,
"trackball": pygfx.TrackballController,
"orbit": pygfx.OrbitController,
}
def create_controller(
controller_type: Union[pygfx.Controller, None, str],
camera: pygfx.PerspectiveCamera,
) -> pygfx.Controller:
"""
Creates the controllers and adds the camera to it.
"""
if isinstance(controller_type, pygfx.Controller):
controller_type.add_camera(camera)
return controller_type
if controller_type is None:
# default controllers
if camera.fov == 0:
# default for orthographic
return pygfx.PanZoomController(camera)
else:
return pygfx.FlyController(camera)
if controller_type not in controller_types.keys():
raise KeyError(
f"controller must be a valid pygfx.Controller or one of: "
f"{list(controller_types.keys())}, you have passed: {controller_type}"
)
return controller_types[controller_type](camera)