d7403ad2d1
demo to match. Also fixed some deprecation warnings. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@27049 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
131 lines
4.1 KiB
Python
131 lines
4.1 KiB
Python
"""
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PyColourChooser
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Copyright (C) 2002 Michael Gilfix <mgilfix@eecs.tufts.edu>
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This file is part of PyColourChooser.
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This version of PyColourChooser is open source; you can redistribute it
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and/or modify it under the licensed terms.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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"""
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# 12/14/2003 - Jeff Grimmett (grimmtooth@softhome.net)
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#
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# o 2.5 compatability update.
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#
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# 12/21/2003 - Jeff Grimmett (grimmtooth@softhome.net)
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#
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# o wxPyColorChooser -> PyColorChooser
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# o wxPyColourChooser -> PyColourChooser
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#
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import wx
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class BitmapBuffer(wx.MemoryDC):
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"""A screen buffer class.
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This class implements a screen output buffer. Data is meant to
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be drawn in the buffer class and then blitted directly to the
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output device, or on-screen window.
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"""
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def __init__(self, width, height, colour):
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"""Initialize the empty buffer object."""
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wx.MemoryDC.__init__(self)
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self.width = width
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self.height = height
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self.colour = colour
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self.bitmap = wx.EmptyBitmap(self.width, self.height)
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self.SelectObject(self.bitmap)
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# Initialize the buffer to the background colour
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self.SetBackground(wx.Brush(self.colour, wx.SOLID))
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self.Clear()
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# Make each logical unit of the buffer equal to 1 pixel
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self.SetMapMode(wx.MM_TEXT)
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def GetBitmap(self):
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"""Returns the internal bitmap for direct drawing."""
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return self.bitmap
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class Canvas(wx.Window):
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"""A canvas class for arbitrary drawing.
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The Canvas class implements a window that allows for drawing
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arbitrary graphics. It implements a double buffer scheme and
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blits the off-screen buffer to the window during paint calls
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by the windowing system for speed.
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Some other methods for determining the canvas colour and size
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are also provided.
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"""
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def __init__(self, parent, id,
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pos=wx.DefaultPosition,
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size=wx.DefaultSize,
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style=wx.SIMPLE_BORDER):
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"""Creates a canvas instance and initializes the off-screen
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buffer. Also sets the handler for rendering the canvas
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automatically via size and paint calls from the windowing
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system."""
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wx.Window.__init__(self, parent, id, pos, size, style)
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# Perform an intial sizing
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self.ReDraw()
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# Register event handlers
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self.Bind(wx.EVT_SIZE, self.onSize)
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self.Bind(wx.EVT_PAINT, self.onPaint)
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def MakeNewBuffer(self):
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size = self.GetSize()
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self.buffer = BitmapBuffer(size[0], size[1],
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self.GetBackgroundColour())
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def onSize(self, event):
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"""Perform actual redraw to off-screen buffer only when the
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size of the canvas has changed. This saves a lot of computation
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since the same image can be re-used, provided the canvas size
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hasn't changed."""
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self.MakeNewBuffer()
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self.DrawBuffer()
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self.Refresh()
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def ReDraw(self):
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"""Explicitly tells the canvas to redraw it's contents."""
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self.onSize(None)
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def Refresh(self):
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"""Re-draws the buffer contents on-screen."""
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dc = wx.ClientDC(self)
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self.Blit(dc)
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def onPaint(self, event):
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"""Renders the off-screen buffer on-screen."""
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dc = wx.PaintDC(self)
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self.Blit(dc)
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def Blit(self, dc):
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"""Performs the blit of the buffer contents on-screen."""
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width, height = self.buffer.GetSize()
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dc.BeginDrawing()
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dc.Blit(0, 0, width, height, self.buffer, 0, 0)
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dc.EndDrawing()
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def GetBoundingRect(self):
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"""Returns a tuple that contains the co-ordinates of the
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top-left and bottom-right corners of the canvas."""
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x, y = self.GetPosition()
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w, h = self.GetSize()
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return(x, y + h, x + w, y)
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def DrawBuffer(self):
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"""Actual drawing function for drawing into the off-screen
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buffer. To be overrideen in the implementing class. Do nothing
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by default."""
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pass
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