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Lock window size in renders #273

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Lock window size in renders #273

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f31e680
Lock render window size in draw and animate
BorniaPedro Aug 7, 2026
eac5a4b
Fix formatting with 'black'
BorniaPedro Aug 7, 2026
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22 changes: 22 additions & 0 deletions pterasoftware/output.py
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Original file line number Diff line number Diff line change
Expand Up @@ -332,6 +332,11 @@ def draw(
if not pv.OFF_SCREEN:
render_window = plotter.ren_win
assert render_window is not None
if plotter.iren is not None:
plotter.iren.add_observer(
"ConfigureEvent",
lambda *args: render_window.SetSize(window_width, window_height),
)
render_window.Render()
granted_width, granted_height = render_window.GetSize()
if granted_width < window_width or granted_height < window_height:
Expand Down Expand Up @@ -646,6 +651,10 @@ def draw(

# If saving, take a screenshot and save it as a WebP.
if save:
# Re-assert the requested render window size before taking the screenshot.
assert plotter.ren_win is not None
plotter.ren_win.SetSize(window_width, window_height)

image = _output_rendering.screenshot_image(plotter)

# webp annotates file_path as a str, so the Path is converted at the boundary.
Expand Down Expand Up @@ -860,6 +869,11 @@ def animate(
if not pv.OFF_SCREEN:
render_window = plotter.ren_win
assert render_window is not None
if plotter.iren is not None:
plotter.iren.add_observer(
"ConfigureEvent",
lambda *args: render_window.SetSize(window_width, window_height),
)
render_window.Render()
granted_width, granted_height = render_window.GetSize()
if granted_width < window_width or granted_height < window_height:
Expand Down Expand Up @@ -1171,6 +1185,10 @@ def animate(
plotter.remove_actor(temporary_actor, render=False)
plotter.camera.clipping_range = free_flight_clipping_range

# Re-assert the requested render window size before capturing the first frame.
assert plotter.ren_win is not None
plotter.ren_win.SetSize(window_width, window_height)

# Start a list to hold a WebP Image of each frame, beginning with this first frame.
images = [_output_rendering.screenshot_image(plotter)]

Expand Down Expand Up @@ -1270,6 +1288,10 @@ def animate(
if T_reflect is not None:
_output_rendering.settle_scalar_bar_layout(plotter)

# Re-assert the requested render window size before rendering this frame.
assert plotter.ren_win is not None
plotter.ren_win.SetSize(window_width, window_height)

# Render the assembled frame. Every add above is made with render=False, so
# without this the frame would never reach the screen. Rendering once the frame
# is whole is invisible, unlike the renders the adds used to trigger.
Expand Down