wxPython/tests/test_scaleText.py

   1 import wx
   2
   3 METHOD = 1
   4 SCALE  = 0.5
   5
   6 class TestPanel(wx.Panel):
   7     """
   8     Shows some ways to scale text down
   9     """
  10     def __init__(self, *args, **kw):
  11         wx.Panel.__init__(self, *args, **kw)
  12         self.Bind(wx.EVT_PAINT, self.OnPaint)
  13
  14     def OnPaint(self, evt):
  15         pdc = wx.PaintDC(self)
  16         font = wx.FFont(28, wx.SWISS)
  17         pdc.SetFont(font)
  18         txt = "Here is some text"
  19
  20         # draw the original unscaled text
  21         pdc.DrawText(txt, 10, 10)
  22
  23         if METHOD == 0:
  24             # Create a new font that is scaled
  25             points = font.GetPointSize() * SCALE
  26             font.SetPointSize(points)
  27             pdc.SetFont(font)
  28             pdc.DrawText(txt, 10, 100)
  29
  30         if METHOD == 1:
  31             # Draw to a bitmap and scale that
  32             w,h = pdc.GetTextExtent(txt)
  33             bmp = wx.EmptyBitmap(w, h)
  34             mdc = wx.MemoryDC(bmp)
  35             mdc.SetBackground(wx.Brush(self.GetBackgroundColour()))
  36             mdc.Clear()
  37             mdc.SetFont(font)
  38             mdc.DrawText(txt, 0,0)
  39             del mdc
  40
  41             image = bmp.ConvertToImage()
  42             image = image.Scale(w*SCALE, h*SCALE, wx.IMAGE_QUALITY_HIGH)
  43             bmp = wx.BitmapFromImage(image)
  44             bmp.SetMaskColour(self.GetBackgroundColour())
  45
  46             pdc.DrawBitmap(bmp, 10,100)
  47
  48
  49         elif METHOD == 2:
  50             # Just scale the DC and draw the text again
  51             pdc.SetUserScale(SCALE, SCALE)
  52             pdc.DrawText(txt, 10/SCALE, 100/SCALE)
  53
  54
  55         elif METHOD == 3:
  56             # Use a GraphicsContext for scaling.  Since it uses a
  57             # floating point coordinate system, it can be more
  58             # accurate.
  59             gc = wx.GraphicsContext.Create(pdc)
  60             gc.Scale(SCALE, SCALE)
  61             gc.SetFont(font)
  62             gc.DrawText(txt, 10/SCALE, 100/SCALE)
  63
  64
  65
  66 app = wx.App()
  67 frm = wx.Frame(None, title="test_scaleText")
  68 pnl = TestPanel(frm)
  69 frm.Show()
  70 app.MainLoop()
  71