Python/wxPython/Graphics

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

Draw line by Cairo

• Context class of PyCairo
• Context class of CairoCFFI

#!/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()