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41 lines
1.4 KiB
Python
41 lines
1.4 KiB
Python
from contextlib import nullcontext
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from . import backend_cairo, backend_gtk4
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from .backend_gtk4 import Gtk, _BackendGTK4
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class RendererGTK4Cairo(backend_cairo.RendererCairo):
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def set_context(self, ctx):
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self.gc.ctx = backend_cairo._to_context(ctx)
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class FigureCanvasGTK4Cairo(backend_gtk4.FigureCanvasGTK4,
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backend_cairo.FigureCanvasCairo):
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_context_is_scaled = True
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def __init__(self, figure):
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super().__init__(figure)
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self._renderer = RendererGTK4Cairo(self.figure.dpi)
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def on_draw_event(self, widget, ctx):
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with (self.toolbar._wait_cursor_for_draw_cm() if self.toolbar
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else nullcontext()):
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self._renderer.set_context(ctx)
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scale = self.device_pixel_ratio
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# Scale physical drawing to logical size.
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ctx.scale(1 / scale, 1 / scale)
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allocation = self.get_allocation()
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Gtk.render_background(
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self.get_style_context(), ctx,
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allocation.x, allocation.y,
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allocation.width, allocation.height)
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self._renderer.set_width_height(
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allocation.width * scale, allocation.height * scale)
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self._renderer.dpi = self.figure.dpi
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self.figure.draw(self._renderer)
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@_BackendGTK4.export
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class _BackendGTK4Cairo(_BackendGTK4):
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FigureCanvas = FigureCanvasGTK4Cairo
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