Python/wxPython/Graphics: Difference between revisions
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| (12 intermediate revisions by the same user not shown) | |||
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= wx.DC | = Known Issues = | ||
< | * wx.DC cannot use matrix on macOS | ||
* pycairo cannot use FreeType font | |||
* wx.lib.wxcairo.FontFaceFromFont(wxfont) is the best way to set font | |||
* If draw something using both wx.DC and cairo.Context, some shape or text would be disappered. | |||
= Set font and show text = | |||
<source lang="python" line="true" highlight="21-31"> | |||
import subprocess | |||
import cairo | |||
import wx | |||
import wx.lib.wxcairo | |||
WIDTH = 400 | |||
HEIGHT = 300 | |||
surface = cairo.ImageSurface( | |||
cairo.FORMAT_RGB24, | |||
WIDTH, | |||
HEIGHT | |||
) | |||
ctx = cairo.Context(surface) | |||
ctx.rectangle(0, 0, WIDTH, HEIGHT) | |||
ctx.set_source_rgb(0.8, 0.8, 1) | |||
ctx.fill() | |||
# Drawing code | |||
app = wx.App() | |||
wfont = wx.Font( | |||
13, | |||
wx.FONTFAMILY_DEFAULT, | |||
wx.FONTSTYLE_NORMAL, | |||
wx.FONTWEIGHT_NORMAL, | |||
False, | |||
'蘋果儷細宋' | |||
) | |||
cfont = wx.lib.wxcairo.FontFaceFromFont(wfont) | |||
ctx.set_font_face(cfont) | |||
ctx.set_font_size(13) | |||
ctx.set_source_rgb(0, 0, 0) | |||
ctx.move_to(20, 80) | |||
ctx.show_text('Your grand mom, 林啊罵勒') | |||
# End of drawing code | |||
surface.write_to_png('text.png') | |||
subprocess.run(['open', 'text.png']) | |||
</source> | |||
</ | |||
= Draw line by | = Draw line by Cairo = | ||
<source lang="python" line="true" highlight=" | * [https://cairographics.org/documentation/pycairo/2/reference/context.html#class-context Context class of PyCairo] | ||
* [https://cairocffi.readthedocs.io/en/stable/api.html#context Context class of CairoCFFI] | |||
<source lang="python" line="true" highlight="14-23"> | |||
#!/usr/bin/env python3 | #!/usr/bin/env python3 | ||
import wx | import wx | ||
import wx.lib.wxcairo | |||
class MyApp(wx.App): | class MyApp(wx.App): | ||
| Line 28: | Line 66: | ||
def OnPaint(self, evt): | def OnPaint(self, evt): | ||
dc = wx.PaintDC(self.mainFrame) | # dc = wx.BufferedPaintDC(self.mainFrame) | ||
dc. | # dc = wx.PaintDC(self.mainFrame) | ||
# dc = wx.ClientDC(self.mainFrame) | |||
dc = wx.WindowDC(self.mainFrame) | |||
ctx = wx.lib.wxcairo.ContextFromDC(dc) | |||
ctx.set_line_width(5) | |||
ctx.move_to(10, 20) | |||
ctx.line_to(200, 20) | |||
ctx.stroke() | |||
if __name__ == '__main__': | if __name__ == '__main__': | ||
| Line 36: | Line 81: | ||
</source> | </source> | ||
= Draw line by | = Draw line by PaintDC = | ||
<source lang="python" line="true" highlight="8,13-15"> | |||
<source lang="python" line="true" highlight=" | |||
#!/usr/bin/env python3 | #!/usr/bin/env python3 | ||
import wx | import wx | ||
class MyApp(wx.App): | class MyApp(wx.App): | ||
| Line 55: | Line 97: | ||
def OnPaint(self, evt): | def OnPaint(self, evt): | ||
dc = wx.PaintDC(self.mainFrame) | dc = wx.PaintDC(self.mainFrame) | ||
dc.DrawLine(10, 10, 200, 10) | |||
if __name__ == '__main__': | if __name__ == '__main__': | ||
| Line 65: | Line 103: | ||
app.MainLoop() | app.MainLoop() | ||
</source> | </source> | ||
= wx.DC hierarchy = | |||
<quickgv name="DC" theme="warm> | |||
rankdir=BT; | |||
A [label="wx.DC"]; | |||
B1 [label="wx.WindowDC"]; | |||
B2 [label="wx.MemoryDC"]; | |||
B3 [label="wx.SVGFileDC"]; | |||
B4 [label="wx.MetaFileDC"]; | |||
B5 [label="wx.MirrorDC"]; | |||
B6 [label="wx.PostScriptDC"]; | |||
B7 [label="wx.PrinterDC"]; | |||
B8 [label="wx.ScreenDC"]; | |||
C [label="wx.ClientDC"]; | |||
D [label="wx.PaintDC"]; | |||
E [label="wx.BufferedDC"]; | |||
F [label="wx.BufferedPaintDC"]; | |||
G [label="wx.AutoBufferedPaintDC"]; | |||
D -> C; | |||
C -> B1; | |||
{B1 B2 B3 B4 B5 B6 B7 B8} -> A; | |||
G -> F -> E -> B2; | |||
</quickgv> | |||
Latest revision as of 01:07, 11 April 2019
Known Issues
- wx.DC cannot use matrix on macOS
- pycairo cannot use FreeType font
- wx.lib.wxcairo.FontFaceFromFont(wxfont) is the best way to set font
- If draw something using both wx.DC and cairo.Context, some shape or text would be disappered.
Set font and show text
import subprocess
import cairo
import wx
import wx.lib.wxcairo
WIDTH = 400
HEIGHT = 300
surface = cairo.ImageSurface(
cairo.FORMAT_RGB24,
WIDTH,
HEIGHT
)
ctx = cairo.Context(surface)
ctx.rectangle(0, 0, WIDTH, HEIGHT)
ctx.set_source_rgb(0.8, 0.8, 1)
ctx.fill()
# Drawing code
app = wx.App()
wfont = wx.Font(
13,
wx.FONTFAMILY_DEFAULT,
wx.FONTSTYLE_NORMAL,
wx.FONTWEIGHT_NORMAL,
False,
'蘋果儷細宋'
)
cfont = wx.lib.wxcairo.FontFaceFromFont(wfont)
ctx.set_font_face(cfont)
ctx.set_font_size(13)
ctx.set_source_rgb(0, 0, 0)
ctx.move_to(20, 80)
ctx.show_text('Your grand mom, 林啊罵勒')
# End of drawing code
surface.write_to_png('text.png')
subprocess.run(['open', 'text.png'])
Draw line by Cairo
#!/usr/bin/env python3
import wx
import wx.lib.wxcairo
class MyApp(wx.App):
def OnInit(self):
frame = wx.Frame(None, -1, 'Hello World!')
frame.Bind(wx.EVT_PAINT, self.OnPaint)
frame.Show()
self.mainFrame = frame
return True
def OnPaint(self, evt):
# dc = wx.BufferedPaintDC(self.mainFrame)
# dc = wx.PaintDC(self.mainFrame)
# dc = wx.ClientDC(self.mainFrame)
dc = wx.WindowDC(self.mainFrame)
ctx = wx.lib.wxcairo.ContextFromDC(dc)
ctx.set_line_width(5)
ctx.move_to(10, 20)
ctx.line_to(200, 20)
ctx.stroke()
if __name__ == '__main__':
app = MyApp()
app.MainLoop()
Draw line by PaintDC
#!/usr/bin/env python3
import wx
class MyApp(wx.App):
def OnInit(self):
frame = wx.Frame(None, -1, 'Hello World!')
frame.Bind(wx.EVT_PAINT, self.OnPaint)
frame.Show()
self.mainFrame = frame
return True
def OnPaint(self, evt):
dc = wx.PaintDC(self.mainFrame)
dc.DrawLine(10, 10, 200, 10)
if __name__ == '__main__':
app = MyApp()
app.MainLoop()