The wxPython tutorial

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The Graphics Device Interfacehttp://www.zetcode.com/wxpython/gdi/angle = 0while (angle < 2*pi):x = radius*cos(angle)y = radius*sin(angle)dc.DrawLinePoint((0, 0), (x, y))angle = angle + 2*pi/360app = wx.App()Lines(None, -1, 'Lines')app.MainLoop()In this example we draw 260 lines from the middle of theclient area. The distance between two lines is 1 degree. Wecreate an interesting figure.import wxfrom math import hypot, sin, cos, piWe need three mathematical functions and one constant fromthe math module.dc.SetDeviceOrigin(size_x/2, size_y/2)The method SetDeviceOrigin() creates a new beginning of thecoordinate system. We place it into the middle of the clientarea. By repositioning the coordinate system, we make ourdrawing less complicated.radius = hypot(size_x/2, size_y/2)Here we get the Hypotenuse. It is the longest line, we candraw from the middle of the client area. It is the length of theline, that should be drawn from the beginning into the cornerof the window. This way most of the lines are not drawn fully.The overlapping parts are not visible. see Hypotenuse.x = radius*cos(angle)y = radius*sin(angle)These are parametric functions. They are used to find [x, y]points on the curve. All 360 lines are drawn from thebeginning of the coordinate system up to the points on thecircle.26 de 44 27/04/2008 1:08
The Graphics Device Interfacehttp://www.zetcode.com/wxpython/gdi/Figure: LinesClippingClipping is restricting drawing to a certain area. Clipping isused in two cases. To create effects and to improveperformance of the application. We restrict drawing to acertain region with the SetClippingRegionAsRegion() method.In the following example we will modify and enhance ourprevious script.#!/usr/bin/python# star.pyimport wxfrom math import hypot, sin, cos, piclass Star(wx.Frame):def __init__(self, parent, id, title):wx.Frame.__init__(self, parent, id, title, size=(350, 300))self.Bind(wx.EVT_PAINT, self.OnPaint)self.Centre()27 de 44 27/04/2008 1:08
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The wxPython tutorialhttp://www.zet
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Introduction to wxPythonhttp://www.
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Menus and Toolbars in wxPythonhttp:
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Layout management in wxPythonhttp:/
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Events in wxPythonhttp://www.zetcod
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wxPython dialogshttp://www.zetcode.
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wxPython widgetshttp://www.zetcode.
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Drag and drop in wxPythonhttp://www
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Internationalizationhttp://www.zetc
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