]> git.saurik.com Git - wxWidgets.git/blob - wxPython/demo/GraphicsContext.py
Another package name fix
[wxWidgets.git] / wxPython / demo / GraphicsContext.py
1
2 import wx
3 import colorsys
4 from math import cos, sin, radians
5
6 #----------------------------------------------------------------------
7
8 BASE = 80.0 # sizes used in shapes drawn below
9 BASE2 = BASE/2
10 BASE4 = BASE/4
11
12
13 class TestPanel(wx.Panel):
14 def __init__(self, parent, log):
15 self.log = log
16 wx.Panel.__init__(self, parent, -1)
17
18 self.Bind(wx.EVT_PAINT, self.OnPaint)
19
20 def OnPaint(self, evt):
21 dc = wx.PaintDC(self)
22 gc = wx.GraphicsContext.Create(dc)
23
24 font = wx.SystemSettings.GetFont(wx.SYS_DEFAULT_GUI_FONT)
25 font.SetWeight(wx.BOLD)
26 gc.SetFont(font)
27
28 # make a path that contains a circle and some lines, centered at 0,0
29 path = gc.CreatePath()
30 path.AddCircle(0, 0, BASE2)
31 path.MoveToPoint(0, -BASE2)
32 path.AddLineToPoint(0, BASE2)
33 path.MoveToPoint(-BASE2, 0)
34 path.AddLineToPoint(BASE2, 0)
35 path.CloseSubpath()
36 path.AddRectangle(-BASE4, -BASE4/2, BASE2, BASE4)
37
38
39 # Now use that path to demonstrate various capbilites of the grpahics context
40 gc.PushState() # save current translation/scale/other state
41 gc.Translate(60, 75) # reposition the context origin
42
43 gc.SetPen(wx.Pen("navy", 1))
44 gc.SetBrush(wx.Brush("pink"))
45
46 # show the difference between stroking, filling and drawing
47 for label, PathFunc in [("StrokePath", gc.StrokePath),
48 ("FillPath", gc.FillPath),
49 ("DrawPath", gc.DrawPath)]:
50 if "wxGTK" in wx.PlatformInfo:
51 w, h = dc.GetTextExtent(label) # NYI in Cairo context
52 else:
53 w, h = gc.GetTextExtent(label)
54
55 gc.DrawText(label, -w/2, -BASE2-h)
56 PathFunc(path)
57 gc.Translate(2*BASE, 0)
58
59
60 gc.PopState() # restore saved state
61 gc.PushState() # save it again
62 gc.Translate(60, 200) # offset to the lower part of the window
63
64 gc.DrawText("Scale", 0, -BASE2)
65 gc.Translate(0, 20)
66
67 gc.SetBrush(wx.Brush(wx.Colour(178, 34, 34, 128))) # 128 == half transparent
68 for cnt in range(8):
69 gc.Scale(1.08, 1.08) # increase scale by 8%
70 gc.Translate(5,5)
71 gc.DrawPath(path)
72
73
74 gc.PopState() # restore saved state
75 gc.PushState() # save it again
76 gc.Translate(400, 200)
77 gc.DrawText("Rotate", 0, -BASE2)
78
79 gc.Translate(0, 75)
80 for angle in range(0, 360, 30):
81 gc.PushState() # save this new current state so we can pop back to
82 # it at the end of the loop
83 r, g, b = [int(c * 255) for c in colorsys.hsv_to_rgb(float(angle)/360, 1, 1)]
84 gc.SetBrush(wx.Brush(wx.Colour(r, g, b, 64)))
85
86 # use translate to artfully reposition each drawn path
87 gc.Translate(1.5 * BASE2 * cos(radians(angle)),
88 1.5 * BASE2 * sin(radians(angle)))
89
90 # use Rotate to rotate the path
91 gc.Rotate(radians(angle))
92
93 # now draw it
94 gc.DrawPath(path)
95 gc.PopState()
96
97 gc.PopState()
98
99
100 #----------------------------------------------------------------------
101
102 def runTest(frame, nb, log):
103 win = TestPanel(nb, log)
104 return win
105
106 #----------------------------------------------------------------------
107
108
109
110 overview = """<html><body>
111 <h2><center>wx.GraphicsContext and wx.GraphicsPath</center></h2>
112
113 The new advanced 2D drawing API is implemented via the
114 wx.GraphicsContext and wx.GraphicsPath classes. They wrap GDI+ on
115 Windows, Cairo on wxGTK and CoreGraphics on OS X. They allow
116 path-based drawing with alpha-blending and anti-aliasing, and use a
117 floating point cooridnate system.
118
119 <p>When viewing this sample pay attention to how the rounded edges are
120 smoothed with anti-aliased drawing, and how the shapes on the lower
121 half of the window are partially transparent, allowing you to see what
122 was drawn before.
123
124 </body></html>
125 """
126
127
128
129 if __name__ == '__main__':
130 import sys,os
131 import run
132 run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])
133