1e4a197e4c
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@19793 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
460 lines
15 KiB
Python
460 lines
15 KiB
Python
"""
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This is a port of Konrad Hinsen's tkPlotCanvas.py plotting module.
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After thinking long and hard I came up with the name "wxPlotCanvas.py".
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This file contains two parts; first the re-usable library stuff, then, after
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a "if __name__=='__main__'" test, a simple frame and a few default plots
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for testing.
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Harm van der Heijden, feb 1999
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Original comment follows below:
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# This module defines a plot widget for Tk user interfaces.
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# It supports only elementary line plots at the moment.
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# See the example at the end for documentation...
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#
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# Written by Konrad Hinsen <hinsen@cnrs-orleans.fr>
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# With contributions from RajGopal Srinivasan <raj@cherubino.med.jhmi.edu>
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# Last revision: 1998-7-28
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#
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"""
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from wxPython import wx
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# Not everybody will have Numeric, so let's be cool about it...
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try:
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import Numeric
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except:
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# bummer!
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d = wx.wxMessageDialog(wx.NULL,
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"""This module requires the Numeric module, which could not be imported.
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It probably is not installed (it's not part of the standard Python
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distribution). See the Python site (http://www.python.org) for
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information on downloading source or binaries.""",
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"Numeric not found")
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if d.ShowModal() == wx.wxID_CANCEL:
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d = wx.wxMessageDialog(wx.NULL, "I kid you not! Pressing Cancel won't help you!", "Not a joke", wx.wxOK)
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d.ShowModal()
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import sys
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sys.exit()
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#
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# Plotting classes...
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#
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class PolyPoints:
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def __init__(self, points, attr):
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self.points = Numeric.array(points)
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self.scaled = self.points
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self.attributes = {}
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for name, value in self._attributes.items():
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try:
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value = attr[name]
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except KeyError: pass
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self.attributes[name] = value
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def boundingBox(self):
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return Numeric.minimum.reduce(self.points), \
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Numeric.maximum.reduce(self.points)
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def scaleAndShift(self, scale=1, shift=0):
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self.scaled = scale*self.points+shift
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class PolyLine(PolyPoints):
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def __init__(self, points, **attr):
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PolyPoints.__init__(self, points, attr)
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_attributes = {'color': 'black',
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'width': 1}
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def draw(self, dc):
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color = self.attributes['color']
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width = self.attributes['width']
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arguments = []
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dc.SetPen(wx.wxPen(wx.wxNamedColour(color), width))
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dc.DrawLines(map(tuple,self.scaled))
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class PolyMarker(PolyPoints):
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def __init__(self, points, **attr):
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PolyPoints.__init__(self, points, attr)
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_attributes = {'color': 'black',
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'width': 1,
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'fillcolor': None,
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'size': 2,
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'fillstyle': wx.wxSOLID,
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'outline': 'black',
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'marker': 'circle'}
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def draw(self, dc):
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color = self.attributes['color']
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width = self.attributes['width']
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size = self.attributes['size']
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fillcolor = self.attributes['fillcolor']
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fillstyle = self.attributes['fillstyle']
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marker = self.attributes['marker']
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dc.SetPen(wx.wxPen(wx.wxNamedColour(color),width))
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if fillcolor:
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dc.SetBrush(wx.wxBrush(wx.wxNamedColour(fillcolor),fillstyle))
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else:
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dc.SetBrush(wx.wxBrush(wx.wxNamedColour('black'), wx.wxTRANSPARENT))
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self._drawmarkers(dc, self.scaled, marker, size)
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def _drawmarkers(self, dc, coords, marker,size=1):
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f = eval('self._' +marker)
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for xc, yc in coords:
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f(dc, xc, yc, size)
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def _circle(self, dc, xc, yc, size=1):
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dc.DrawEllipse(xc-2.5*size,yc-2.5*size,5.*size,5.*size)
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def _dot(self, dc, xc, yc, size=1):
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dc.DrawPoint(xc,yc)
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def _square(self, dc, xc, yc, size=1):
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dc.DrawRectangle(xc-2.5*size,yc-2.5*size,5.*size,5.*size)
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def _triangle(self, dc, xc, yc, size=1):
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dc.DrawPolygon([(-0.5*size*5,0.2886751*size*5),
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(0.5*size*5,0.2886751*size*5),
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(0.0,-0.577350*size*5)],xc,yc)
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def _triangle_down(self, dc, xc, yc, size=1):
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dc.DrawPolygon([(-0.5*size*5,-0.2886751*size*5),
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(0.5*size*5,-0.2886751*size*5),
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(0.0,0.577350*size*5)],xc,yc)
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def _cross(self, dc, xc, yc, size=1):
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dc.DrawLine(xc-2.5*size,yc-2.5*size,xc+2.5*size,yc+2.5*size)
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dc.DrawLine(xc-2.5*size,yc+2.5*size,xc+2.5*size,yc-2.5*size)
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def _plus(self, dc, xc, yc, size=1):
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dc.DrawLine(xc-2.5*size,yc,xc+2.5*size,yc)
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dc.DrawLine(xc,yc-2.5*size,xc,yc+2.5*size)
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class PlotGraphics:
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def __init__(self, objects):
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self.objects = objects
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def boundingBox(self):
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p1, p2 = self.objects[0].boundingBox()
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for o in self.objects[1:]:
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p1o, p2o = o.boundingBox()
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p1 = Numeric.minimum(p1, p1o)
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p2 = Numeric.maximum(p2, p2o)
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return p1, p2
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def scaleAndShift(self, scale=1, shift=0):
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for o in self.objects:
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o.scaleAndShift(scale, shift)
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def draw(self, canvas):
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for o in self.objects:
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o.draw(canvas)
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def __len__(self):
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return len(self.objects)
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def __getitem__(self, item):
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return self.objects[item]
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class PlotCanvas(wx.wxWindow):
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def __init__(self, parent, id = -1):
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wx.wxWindow.__init__(self, parent, id, wx.wxPyDefaultPosition, wx.wxPyDefaultSize)
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self.border = (1,1)
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self.SetClientSizeWH(400,400)
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self.SetBackgroundColour(wx.wxNamedColour("white"))
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wx.EVT_SIZE(self,self.reconfigure)
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self._setsize()
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self.last_draw = None
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# self.font = self._testFont(font)
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def OnPaint(self, event):
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pdc = wx.wxPaintDC(self)
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if self.last_draw is not None:
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apply(self.draw, self.last_draw + (pdc,))
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def reconfigure(self, event):
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(new_width,new_height) = self.GetClientSizeTuple()
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if new_width == self.width and new_height == self.height:
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return
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self._setsize()
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# self.redraw()
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def _testFont(self, font):
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if font is not None:
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bg = self.canvas.cget('background')
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try:
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item = CanvasText(self.canvas, 0, 0, anchor=NW,
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text='0', fill=bg, font=font)
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self.canvas.delete(item)
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except TclError:
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font = None
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return font
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def _setsize(self):
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(self.width,self.height) = self.GetClientSizeTuple();
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self.plotbox_size = 0.97*Numeric.array([self.width, -self.height])
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xo = 0.5*(self.width-self.plotbox_size[0])
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yo = self.height-0.5*(self.height+self.plotbox_size[1])
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self.plotbox_origin = Numeric.array([xo, yo])
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def draw(self, graphics, xaxis = None, yaxis = None, dc = None):
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if dc == None: dc = wx.wxClientDC(self)
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dc.BeginDrawing()
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dc.Clear()
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self.last_draw = (graphics, xaxis, yaxis)
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p1, p2 = graphics.boundingBox()
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xaxis = self._axisInterval(xaxis, p1[0], p2[0])
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yaxis = self._axisInterval(yaxis, p1[1], p2[1])
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text_width = [0., 0.]
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text_height = [0., 0.]
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if xaxis is not None:
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p1[0] = xaxis[0]
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p2[0] = xaxis[1]
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xticks = self._ticks(xaxis[0], xaxis[1])
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bb = dc.GetTextExtent(xticks[0][1])
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text_height[1] = bb[1]
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text_width[0] = 0.5*bb[0]
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bb = dc.GetTextExtent(xticks[-1][1])
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text_width[1] = 0.5*bb[0]
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else:
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xticks = None
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if yaxis is not None:
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p1[1] = yaxis[0]
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p2[1] = yaxis[1]
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yticks = self._ticks(yaxis[0], yaxis[1])
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for y in yticks:
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bb = dc.GetTextExtent(y[1])
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text_width[0] = max(text_width[0],bb[0])
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h = 0.5*bb[1]
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text_height[0] = h
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text_height[1] = max(text_height[1], h)
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else:
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yticks = None
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text1 = Numeric.array([text_width[0], -text_height[1]])
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text2 = Numeric.array([text_width[1], -text_height[0]])
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scale = (self.plotbox_size-text1-text2) / (p2-p1)
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shift = -p1*scale + self.plotbox_origin + text1
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self._drawAxes(dc, xaxis, yaxis, p1, p2,
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scale, shift, xticks, yticks)
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graphics.scaleAndShift(scale, shift)
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graphics.draw(dc)
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dc.EndDrawing()
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def _axisInterval(self, spec, lower, upper):
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if spec is None:
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return None
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if spec == 'minimal':
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if lower == upper:
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return lower-0.5, upper+0.5
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else:
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return lower, upper
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if spec == 'automatic':
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range = upper-lower
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if range == 0.:
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return lower-0.5, upper+0.5
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log = Numeric.log10(range)
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power = Numeric.floor(log)
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fraction = log-power
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if fraction <= 0.05:
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power = power-1
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grid = 10.**power
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lower = lower - lower % grid
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mod = upper % grid
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if mod != 0:
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upper = upper - mod + grid
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return lower, upper
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if type(spec) == type(()):
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lower, upper = spec
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if lower <= upper:
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return lower, upper
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else:
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return upper, lower
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raise ValueError, str(spec) + ': illegal axis specification'
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def _drawAxes(self, dc, xaxis, yaxis,
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bb1, bb2, scale, shift, xticks, yticks):
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dc.SetPen(wx.wxPen(wx.wxNamedColour('BLACK'),1))
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if xaxis is not None:
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lower, upper = xaxis
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text = 1
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for y, d in [(bb1[1], -3), (bb2[1], 3)]:
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p1 = scale*Numeric.array([lower, y])+shift
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p2 = scale*Numeric.array([upper, y])+shift
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dc.DrawLine(p1[0],p1[1],p2[0],p2[1])
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for x, label in xticks:
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p = scale*Numeric.array([x, y])+shift
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dc.DrawLine(p[0],p[1],p[0],p[1]+d)
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if text:
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dc.DrawText(label,p[0],p[1])
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text = 0
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if yaxis is not None:
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lower, upper = yaxis
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text = 1
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h = dc.GetCharHeight()
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for x, d in [(bb1[0], -3), (bb2[0], 3)]:
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p1 = scale*Numeric.array([x, lower])+shift
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p2 = scale*Numeric.array([x, upper])+shift
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dc.DrawLine(p1[0],p1[1],p2[0],p2[1])
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for y, label in yticks:
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p = scale*Numeric.array([x, y])+shift
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dc.DrawLine(p[0],p[1],p[0]-d,p[1])
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if text:
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dc.DrawText(label,p[0]-dc.GetTextExtent(label)[0],
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p[1]-0.5*h)
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text = 0
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def _ticks(self, lower, upper):
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ideal = (upper-lower)/7.
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log = Numeric.log10(ideal)
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power = Numeric.floor(log)
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fraction = log-power
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factor = 1.
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error = fraction
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for f, lf in self._multiples:
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e = Numeric.fabs(fraction-lf)
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if e < error:
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error = e
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factor = f
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grid = factor * 10.**power
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if power > 3 or power < -3:
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format = '%+7.0e'
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elif power >= 0:
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digits = max(1, int(power))
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format = '%' + `digits`+'.0f'
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else:
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digits = -int(power)
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format = '%'+`digits+2`+'.'+`digits`+'f'
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ticks = []
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t = -grid*Numeric.floor(-lower/grid)
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while t <= upper:
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ticks.append(t, format % (t,))
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t = t + grid
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return ticks
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_multiples = [(2., Numeric.log10(2.)), (5., Numeric.log10(5.))]
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def redraw(self,dc=None):
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if self.last_draw is not None:
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apply(self.draw, self.last_draw + (dc,))
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def clear(self):
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self.canvas.delete('all')
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#
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# Now a sample implementation using the above...
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#
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if __name__ == '__main__':
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class AppFrame(wx.wxFrame):
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def __init__(self, parent, id, title):
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wx.wxFrame.__init__(self, parent, id, title,
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wx.wxPyDefaultPosition, wx.wxSize(400, 400))
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# Now Create the menu bar and items
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self.mainmenu = wx.wxMenuBar()
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menu = wx.wxMenu()
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menu.Append(200, '&Print...', 'Print the current plot')
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wx.EVT_MENU(self, 200, self.OnFilePrint)
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menu.Append(209, 'E&xit', 'Enough of this already!')
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wx.EVT_MENU(self, 209, self.OnFileExit)
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self.mainmenu.Append(menu, '&File')
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menu = wx.wxMenu()
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menu.Append(210, '&Draw', 'Draw plots')
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wx.EVT_MENU(self,210,self.OnPlotDraw)
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menu.Append(211, '&Redraw', 'Redraw plots')
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wx.EVT_MENU(self,211,self.OnPlotRedraw)
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menu.Append(212, '&Clear', 'Clear canvas')
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wx.EVT_MENU(self,212,self.OnPlotClear)
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self.mainmenu.Append(menu, '&Plot')
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menu = wx.wxMenu()
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menu.Append(220, '&About', 'About this thing...')
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wx.EVT_MENU(self, 220, self.OnHelpAbout)
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self.mainmenu.Append(menu, '&Help')
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self.SetMenuBar(self.mainmenu)
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# A status bar to tell people what's happening
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self.CreateStatusBar(1)
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self.client = PlotCanvas(self)
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def OnFilePrint(self, event):
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d = wx.wxMessageDialog(self,
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"""As of this writing, printing support in wxPython is shaky at best.
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Are you sure you want to do this?""", "Danger!", wx.wxYES_NO)
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if d.ShowModal() == wx.wxID_YES:
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psdc = wx.wxPostScriptDC("out.ps", wx.TRUE, self)
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self.client.redraw(psdc)
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def OnFileExit(self, event):
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self.Close()
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def OnPlotDraw(self, event):
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self.client.draw(InitObjects(),'automatic','automatic');
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def OnPlotRedraw(self,event):
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self.client.redraw()
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def OnPlotClear(self,event):
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self.client.last_draw = None
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dc = wx.wxClientDC(self.client)
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dc.Clear()
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def OnHelpAbout(self, event):
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about = wx.wxMessageDialog(self, __doc__, "About...", wx.wxOK)
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about.ShowModal()
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def OnCloseWindow(self, event):
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self.Destroy()
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def InitObjects():
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# 100 points sin function, plotted as green circles
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data1 = 2.*Numeric.pi*Numeric.arange(200)/200.
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data1.shape = (100, 2)
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data1[:,1] = Numeric.sin(data1[:,0])
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markers1 = PolyMarker(data1, color='green', marker='circle',size=1)
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# 50 points cos function, plotted as red line
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data1 = 2.*Numeric.pi*Numeric.arange(100)/100.
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data1.shape = (50,2)
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data1[:,1] = Numeric.cos(data1[:,0])
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lines = PolyLine(data1, color='red')
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# A few more points...
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pi = Numeric.pi
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markers2 = PolyMarker([(0., 0.), (pi/4., 1.), (pi/2, 0.),
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(3.*pi/4., -1)], color='blue',
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fillcolor='green', marker='cross')
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return PlotGraphics([markers1, lines, markers2])
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class MyApp(wx.wxApp):
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def OnInit(self):
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frame = AppFrame(wx.NULL, -1, "wxPlotCanvas")
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frame.Show(wx.TRUE)
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self.SetTopWindow(frame)
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return wx.TRUE
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app = MyApp(0)
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app.MainLoop()
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