Add a GraphicsContext sample to the demo
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42424 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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Robin Dunn
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@ -50,13 +50,13 @@ def runTest(frame, nb, log):
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overview = """<html><body>
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<h2><center>Alpha Drawing</center></h2>
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The wx.DC on Mac now supports alpha transparent drawing using pens and
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brushes. This is accomplished by enabling the wx.Colour class to have
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a fourth component for the alpha value, where 0 is fully transparent,
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and 255 is fully opaque.
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<p>You can consider this a \"preview of coming attractions\" for the
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other platforms.
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The wx.GCDC class is a class that implemented the wx.DC API using the
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new wx.GraphicsContext class, and so it supports anti-aliased drawing
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using pens and brushes, that can optionally also be drawn using an
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alpha transparency. (On the Mac all the DC classes are using this new
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implementation.) This is accomplished by enabling the wx.Colour class
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to have a fourth component for the alpha value, where 0 is fully
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transparent, and 255 is fully opaque.
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</body></html>
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"""
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134
wxPython/demo/GraphicsContext.py
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134
wxPython/demo/GraphicsContext.py
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@ -0,0 +1,134 @@
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import wx
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import colorsys
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from math import cos, sin, radians
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#----------------------------------------------------------------------
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BASE = 80.0 # sizes used in shapes drawn below
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BASE2 = BASE/2
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BASE4 = BASE/4
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class TestPanel(wx.Panel):
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def __init__(self, parent, log):
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self.log = log
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wx.Panel.__init__(self, parent, -1)
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self.Bind(wx.EVT_PAINT, self.OnPaint)
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def OnPaint(self, evt):
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dc = wx.PaintDC(self)
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gc = wx.GraphicsContext.Create(dc)
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font = wx.SystemSettings.GetFont(wx.SYS_DEFAULT_GUI_FONT)
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font.SetWeight(wx.BOLD)
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gc.SetFont(font)
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# make a path that contains a circle and some lines, centered at 0,0
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path = gc.CreatePath()
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path.AddCircle(0, 0, BASE2)
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path.MoveToPoint(0, -BASE2)
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path.AddLineToPoint(0, BASE2)
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path.MoveToPoint(-BASE2, 0)
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path.AddLineToPoint(BASE2, 0)
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path.CloseSubpath()
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path.AddRectangle(-BASE4, -BASE4/2, BASE2, BASE4)
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# Now use that path to demonstrate various capbilites of the grpahics context
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gc.PushState() # save current translation/scale/other state
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gc.Translate(60, 75) # reposition the context origin
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gc.SetPen(wx.Pen("navy", 1))
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gc.SetBrush(wx.Brush("pink"))
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gc.SetTextColour("black")
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# show the difference between stroking, filling and drawing
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for label, PathFunc in [("StrokePath", gc.StrokePath),
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("FillPath", gc.FillPath),
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("DrawPath", gc.DrawPath)]:
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if "wxGTK" in wx.PlatformInfo:
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w, h = dc.GetTextExtent(label) # NYI in Cairo context
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else:
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w, h = gc.GetTextExtent(label)
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gc.DrawText(label, -w/2, -BASE2-h)
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PathFunc(path)
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gc.Translate(2*BASE, 0)
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gc.PopState() # restore saved state
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gc.PushState() # save it again
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gc.Translate(60, 200) # offset to the lower part of the window
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gc.DrawText("Scale", 0, -BASE2)
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gc.Translate(0, 20)
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gc.SetBrush(wx.Brush(wx.Colour(178, 34, 34, 128))) # 128 == half transparent
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for cnt in range(8):
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gc.Scale(1.08, 1.08) # increase scale by 8%
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gc.Translate(5,5)
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gc.DrawPath(path)
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gc.PopState() # restore saved state
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gc.PushState() # save it again
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gc.Translate(400, 200)
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gc.DrawText("Rotate", 0, -BASE2)
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gc.Translate(0, 75)
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for angle in range(0, 360, 30):
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gc.PushState() # save this new current state so we can pop back to
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# it at the end of the loop
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r, g, b = [int(c * 255) for c in colorsys.hsv_to_rgb(float(angle)/360, 1, 1)]
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gc.SetBrush(wx.Brush(wx.Colour(r, g, b, 64)))
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# use translate to artfully reposition each drawn path
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gc.Translate(1.5 * BASE2 * cos(radians(angle)),
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1.5 * BASE2 * sin(radians(angle)))
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# use Rotate to rotate the path
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gc.Rotate(radians(angle))
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# now draw it
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gc.DrawPath(path)
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gc.PopState()
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gc.PopState()
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#----------------------------------------------------------------------
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def runTest(frame, nb, log):
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win = TestPanel(nb, log)
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return win
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#----------------------------------------------------------------------
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overview = """<html><body>
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<h2><center>wx.GraphicsContext and wx.GraphicsPath</center></h2>
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The new advanced 2D drawing API is implemented via the
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wx.GraphicsContext and wx.GraphicsPath classes. They wrap GDI+ on
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Windows, Cairo on wxGTK and CoreGraphics on OS X. They allow
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path-based drawing with alpha-blending and anti-aliasing, and use a
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floating point cooridnate system.
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<p>When viewing this sample pay attention to how the rounded edges are
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smoothed with anti-aliased drawing, and how the shapes on the lower
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half of the window are partially transparent, allowing you to see what
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was drawn before.
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</body></html>
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"""
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if __name__ == '__main__':
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import sys,os
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import run
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run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])
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@ -68,6 +68,7 @@ _treeList = [
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'AboutBox',
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'AnimateCtrl',
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'AlphaDrawing',
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'GraphicsContext',
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]),
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# managed windows == things with a (optional) caption you can close
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@ -268,6 +269,7 @@ _treeList = [
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'DrawXXXList',
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'FileHistory',
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'FontEnumerator',
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'GraphicsContext',
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'GLCanvas',
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'Joystick',
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'MimeTypesManager',
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@ -23,6 +23,8 @@ of wx.ListCtrl available, which will be used for wx.LC_REPORT style
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list controls if you set the "mac.listctrl.always_use_generic"
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SystemOption to zero. In a future release this will be the default.
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Added a sample to the demo that shows some of what can be done with
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the new wx.GraphicsContext and wx.GraphicsPath classes.
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