backend_wxcairo.py 1.8 KB

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  1. import wx.lib.wxcairo as wxcairo
  2. from .backend_cairo import cairo, FigureCanvasCairo, RendererCairo
  3. from .backend_wx import (
  4. _BackendWx, _FigureCanvasWxBase, FigureFrameWx,
  5. NavigationToolbar2Wx as NavigationToolbar2WxCairo)
  6. class FigureFrameWxCairo(FigureFrameWx):
  7. def get_canvas(self, fig):
  8. return FigureCanvasWxCairo(self, -1, fig)
  9. class FigureCanvasWxCairo(_FigureCanvasWxBase, FigureCanvasCairo):
  10. """
  11. The FigureCanvas contains the figure and does event handling.
  12. In the wxPython backend, it is derived from wxPanel, and (usually) lives
  13. inside a frame instantiated by a FigureManagerWx. The parent window
  14. probably implements a wxSizer to control the displayed control size - but
  15. we give a hint as to our preferred minimum size.
  16. """
  17. def __init__(self, parent, id, figure):
  18. # _FigureCanvasWxBase should be fixed to have the same signature as
  19. # every other FigureCanvas and use cooperative inheritance, but in the
  20. # meantime the following will make do.
  21. _FigureCanvasWxBase.__init__(self, parent, id, figure)
  22. FigureCanvasCairo.__init__(self, figure)
  23. self._renderer = RendererCairo(self.figure.dpi)
  24. def draw(self, drawDC=None):
  25. width = int(self.figure.bbox.width)
  26. height = int(self.figure.bbox.height)
  27. surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
  28. self._renderer.set_ctx_from_surface(surface)
  29. self._renderer.set_width_height(width, height)
  30. self.figure.draw(self._renderer)
  31. self.bitmap = wxcairo.BitmapFromImageSurface(surface)
  32. self._isDrawn = True
  33. self.gui_repaint(drawDC=drawDC, origin='WXCairo')
  34. @_BackendWx.export
  35. class _BackendWxCairo(_BackendWx):
  36. FigureCanvas = FigureCanvasWxCairo
  37. _frame_class = FigureFrameWxCairo