utils/wxPython/tests/wxPlotCanvas.py

   1 """
   2 This is a port of Konrad Hinsen's tkPlotCanvas.py plotting module.
   3 After thinking long and hard I came up with the name "wxPlotCanvas.py".
   4
   5 This file contains two parts; first the re-usable library stuff, then, after
   6 a "if __name__=='__main__'" test, a simple frame and a few default plots
   7 for testing.
   8
   9 Harm van der Heijden, feb 1999
  10
  11 Original comment follows below:
  12 # This module defines a plot widget for Tk user interfaces.
  13 # It supports only elementary line plots at the moment.
  14 # See the example at the end for documentation...
  15 #
  16 # Written by Konrad Hinsen <hinsen@cnrs-orleans.fr>
  17 # With contributions from RajGopal Srinivasan <raj@cherubino.med.jhmi.edu>
  18 # Last revision: 1998-7-28
  19 #
  20 """
  21
  22 from wxPython import wx
  23 import string
  24
  25 # Not everybody will have Numeric, so let's be cool about it...
  26 try:
  27     import Numeric
  28 except:
  29     # bummer!
  30     d = wx.wxMessageDialog(wx.NULL,
  31     """This module requires the Numeric module, which could not be imported.
  32 It probably is not installed (it's not part of the standard Python
  33 distribution). See the Python site (http://www.python.org) for
  34 information on downloading source or binaries.""",
  35     "Numeric not found")
  36     if d.ShowModal() == wx.wxID_CANCEL:
  37         d = wx.wxMessageDialog(wx.NULL, "I kid you not! Pressing Cancel won't help you!", "Not a joke", wx.wxOK)
  38         d.ShowModal()
  39     import sys
  40     sys.exit()
  41
  42 #
  43 # Plotting classes...
  44 #
  45 class PolyPoints:
  46
  47     def __init__(self, points, attr):
  48         self.points = Numeric.array(points)
  49         self.scaled = self.points
  50         self.attributes = {}
  51         for name, value in self._attributes.items():
  52             try:
  53                 value = attr[name]
  54             except KeyError: pass
  55             self.attributes[name] = value
  56
  57     def boundingBox(self):
  58         return Numeric.minimum.reduce(self.points), \
  59                Numeric.maximum.reduce(self.points)
  60
  61     def scaleAndShift(self, scale=1, shift=0):
  62         self.scaled = scale*self.points+shift
  63
  64
  65 class PolyLine(PolyPoints):
  66
  67     def __init__(self, points, **attr):
  68         PolyPoints.__init__(self, points, attr)
  69
  70     _attributes = {'color': 'black',
  71                    'width': 1}
  72
  73     def draw(self, dc):
  74         color = self.attributes['color']
  75         width = self.attributes['width']
  76         arguments = []
  77         dc.SetPen(wx.wxPen(wx.wxNamedColour(color), width))
  78         dc.DrawLines(map(tuple,self.scaled))
  79
  80
  81 class PolyMarker(PolyPoints):
  82
  83     def __init__(self, points, **attr):
  84
  85         PolyPoints.__init__(self, points, attr)
  86
  87     _attributes = {'color': 'black',
  88                    'width': 1,
  89                    'fillcolor': None,
  90                    'size': 2,
  91                    'fillstyle': wx.wxSOLID,
  92                    'outline': 'black',
  93                    'marker': 'circle'}
  94
  95     def draw(self, dc):
  96         color = self.attributes['color']
  97         width = self.attributes['width']
  98         size = self.attributes['size']
  99         fillcolor = self.attributes['fillcolor']
 100         fillstyle = self.attributes['fillstyle']
 101         marker = self.attributes['marker']
 102
 103         dc.SetPen(wx.wxPen(wx.wxNamedColour(color),width))
 104         if fillcolor:
 105             dc.SetBrush(wx.wxBrush(wx.wxNamedColour(fillcolor),fillstyle))
 106         else:
 107             dc.SetBrush(wx.wxBrush(wx.wxNamedColour('black'), wx.wxTRANSPARENT))
 108
 109         self._drawmarkers(dc, self.scaled, marker, size)
 110
 111     def _drawmarkers(self, dc, coords, marker,size=1):
 112         f = eval('self._' +marker)
 113         for xc, yc in coords:
 114             f(dc, xc, yc, size)
 115
 116     def _circle(self, dc, xc, yc, size=1):
 117         dc.DrawEllipse(xc-2.5*size,yc-2.5*size,5.*size,5.*size)
 118
 119     def _dot(self, dc, xc, yc, size=1):
 120         dc.DrawPoint(xc,yc)
 121
 122     def _square(self, dc, xc, yc, size=1):
 123         dc.DrawRectangle(xc-2.5*size,yc-2.5*size,5.*size,5.*size)
 124
 125     def _triangle(self, dc, xc, yc, size=1):
 126         dc.DrawPolygon([(-0.5*size*5,0.2886751*size*5),
 127                        (0.5*size*5,0.2886751*size*5),
 128                        (0.0,-0.577350*size*5)],xc,yc)
 129
 130     def _triangle_down(self, dc, xc, yc, size=1):
 131         dc.DrawPolygon([(-0.5*size*5,-0.2886751*size*5),
 132                        (0.5*size*5,-0.2886751*size*5),
 133                        (0.0,0.577350*size*5)],xc,yc)
 134
 135     def _cross(self, dc, xc, yc, size=1):
 136         dc.DrawLine(xc-2.5*size,yc-2.5*size,xc+2.5*size,yc+2.5*size)
 137         dc.DrawLine(xc-2.5*size,yc+2.5*size,xc+2.5*size,yc-2.5*size)
 138
 139     def _plus(self, dc, xc, yc, size=1):
 140         dc.DrawLine(xc-2.5*size,yc,xc+2.5*size,yc)
 141         dc.DrawLine(xc,yc-2.5*size,xc,yc+2.5*size)
 142
 143 class PlotGraphics:
 144
 145     def __init__(self, objects):
 146         self.objects = objects
 147
 148     def boundingBox(self):
 149         p1, p2 = self.objects[0].boundingBox()
 150         for o in self.objects[1:]:
 151             p1o, p2o = o.boundingBox()
 152             p1 = Numeric.minimum(p1, p1o)
 153             p2 = Numeric.maximum(p2, p2o)
 154         return p1, p2
 155
 156     def scaleAndShift(self, scale=1, shift=0):
 157         for o in self.objects:
 158             o.scaleAndShift(scale, shift)
 159
 160     def draw(self, canvas):
 161         for o in self.objects:
 162             o.draw(canvas)
 163
 164     def __len__(self):
 165         return len(self.objects)
 166
 167     def __getitem__(self, item):
 168         return self.objects[item]
 169
 170
 171 class PlotCanvas(wx.wxWindow):
 172
 173     def __init__(self, parent, id = -1):
 174         wx.wxWindow.__init__(self, parent, id, wx.wxPyDefaultPosition, wx.wxPyDefaultSize)
 175         self.border = (1,1)
 176         self.SetClientSizeWH(400,400)
 177         self.SetBackgroundColour(wx.wxNamedColour("white"))
 178
 179         wx.EVT_SIZE(self,self.reconfigure)
 180         self._setsize()
 181         self.last_draw = None
 182 #       self.font = self._testFont(font)
 183
 184     def OnPaint(self, event):
 185         pdc = wx.wxPaintDC(self)
 186         if self.last_draw is not None:
 187             apply(self.draw, self.last_draw + (pdc,))
 188
 189     def reconfigure(self, event):
 190         (new_width,new_height) = self.GetClientSizeTuple()
 191         if new_width == self.width and new_height == self.height:
 192             return
 193         self._setsize()
 194         # self.redraw()
 195
 196     def _testFont(self, font):
 197         if font is not None:
 198             bg = self.canvas.cget('background')
 199             try:
 200                 item = CanvasText(self.canvas, 0, 0, anchor=NW,
 201                                   text='0', fill=bg, font=font)
 202                 self.canvas.delete(item)
 203             except TclError:
 204                 font = None
 205         return font
 206
 207     def _setsize(self):
 208         (self.width,self.height) = self.GetClientSizeTuple();
 209         self.plotbox_size = 0.97*Numeric.array([self.width, -self.height])
 210         xo = 0.5*(self.width-self.plotbox_size[0])
 211         yo = self.height-0.5*(self.height+self.plotbox_size[1])
 212         self.plotbox_origin = Numeric.array([xo, yo])
 213
 214     def draw(self, graphics, xaxis = None, yaxis = None, dc = None):
 215         if dc == None: dc = wx.wxClientDC(self)
 216         dc.BeginDrawing()
 217         dc.Clear()
 218         self.last_draw = (graphics, xaxis, yaxis)
 219         p1, p2 = graphics.boundingBox()
 220         xaxis = self._axisInterval(xaxis, p1[0], p2[0])
 221         yaxis = self._axisInterval(yaxis, p1[1], p2[1])
 222         text_width = [0., 0.]
 223         text_height = [0., 0.]
 224         if xaxis is not None:
 225             p1[0] = xaxis[0]
 226             p2[0] = xaxis[1]
 227             xticks = self._ticks(xaxis[0], xaxis[1])
 228             bb = dc.GetTextExtent(xticks[0][1])
 229             text_height[1] = bb[1]
 230             text_width[0] = 0.5*bb[0]
 231             bb = dc.GetTextExtent(xticks[-1][1])
 232             text_width[1] = 0.5*bb[0]
 233         else:
 234             xticks = None
 235         if yaxis is not None:
 236             p1[1] = yaxis[0]
 237             p2[1] = yaxis[1]
 238             yticks = self._ticks(yaxis[0], yaxis[1])
 239             for y in yticks:
 240                 bb = dc.GetTextExtent(y[1])
 241                 text_width[0] = max(text_width[0],bb[0])
 242             h = 0.5*bb[1]
 243             text_height[0] = h
 244             text_height[1] = max(text_height[1], h)
 245         else:
 246             yticks = None
 247         text1 = Numeric.array([text_width[0], -text_height[1]])
 248         text2 = Numeric.array([text_width[1], -text_height[0]])
 249         scale = (self.plotbox_size-text1-text2) / (p2-p1)
 250         shift = -p1*scale + self.plotbox_origin + text1
 251         self._drawAxes(dc, xaxis, yaxis, p1, p2,
 252                        scale, shift, xticks, yticks)
 253         graphics.scaleAndShift(scale, shift)
 254         graphics.draw(dc)
 255         dc.EndDrawing()
 256
 257     def _axisInterval(self, spec, lower, upper):
 258         if spec is None:
 259             return None
 260         if spec == 'minimal':
 261             if lower == upper:
 262                 return lower-0.5, upper+0.5
 263             else:
 264                 return lower, upper
 265         if spec == 'automatic':
 266             range = upper-lower
 267             if range == 0.:
 268                 return lower-0.5, upper+0.5
 269             log = Numeric.log10(range)
 270             power = Numeric.floor(log)
 271             fraction = log-power
 272             if fraction <= 0.05:
 273                 power = power-1
 274             grid = 10.**power
 275             lower = lower - lower % grid
 276             mod = upper % grid
 277             if mod != 0:
 278                 upper = upper - mod + grid
 279             return lower, upper
 280         if type(spec) == type(()):
 281             lower, upper = spec
 282             if lower <= upper:
 283                 return lower, upper
 284             else:
 285                 return upper, lower
 286         raise ValueError, str(spec) + ': illegal axis specification'
 287
 288     def _drawAxes(self, dc, xaxis, yaxis,
 289                   bb1, bb2, scale, shift, xticks, yticks):
 290         dc.SetPen(wx.wxPen(wx.wxNamedColour('BLACK'),1))
 291         if xaxis is not None:
 292             lower, upper = xaxis
 293             text = 1
 294             for y, d in [(bb1[1], -3), (bb2[1], 3)]:
 295                 p1 = scale*Numeric.array([lower, y])+shift
 296                 p2 = scale*Numeric.array([upper, y])+shift
 297                 dc.DrawLine(p1[0],p1[1],p2[0],p2[1])
 298                 for x, label in xticks:
 299                     p = scale*Numeric.array([x, y])+shift
 300                     dc.DrawLine(p[0],p[1],p[0],p[1]+d)
 301                     if text:
 302                         dc.DrawText(label,p[0],p[1])
 303                 text = 0
 304
 305         if yaxis is not None:
 306             lower, upper = yaxis
 307             text = 1
 308             h = dc.GetCharHeight()
 309             for x, d in [(bb1[0], -3), (bb2[0], 3)]:
 310                 p1 = scale*Numeric.array([x, lower])+shift
 311                 p2 = scale*Numeric.array([x, upper])+shift
 312                 dc.DrawLine(p1[0],p1[1],p2[0],p2[1])
 313                 for y, label in yticks:
 314                     p = scale*Numeric.array([x, y])+shift
 315                     dc.DrawLine(p[0],p[1],p[0]-d,p[1])
 316                     if text:
 317                         dc.DrawText(label,p[0]-dc.GetTextExtent(label)[0],
 318                                     p[1]-0.5*h)
 319                 text = 0
 320
 321     def _ticks(self, lower, upper):
 322         ideal = (upper-lower)/7.
 323         log = Numeric.log10(ideal)
 324         power = Numeric.floor(log)
 325         fraction = log-power
 326         factor = 1.
 327         error = fraction
 328         for f, lf in self._multiples:
 329             e = Numeric.fabs(fraction-lf)
 330             if e < error:
 331                 error = e
 332                 factor = f
 333         grid = factor * 10.**power
 334         if power > 3 or power < -3:
 335             format = '%+7.0e'
 336         elif power >= 0:
 337             digits = max(1, int(power))
 338             format = '%' + `digits`+'.0f'
 339         else:
 340             digits = -int(power)
 341             format = '%'+`digits+2`+'.'+`digits`+'f'
 342         ticks = []
 343         t = -grid*Numeric.floor(-lower/grid)
 344         while t <= upper:
 345             ticks.append(t, format % (t,))
 346             t = t + grid
 347         return ticks
 348
 349     _multiples = [(2., Numeric.log10(2.)), (5., Numeric.log10(5.))]
 350
 351     def redraw(self,dc=None):
 352         if self.last_draw is not None:
 353             apply(self.draw, self.last_draw + (dc,))
 354
 355     def clear(self):
 356         self.canvas.delete('all')
 357
 358 #
 359 # Now a sample implementation using the above...
 360 #
 361
 362 if __name__ == '__main__':
 363
 364     class AppFrame(wx.wxFrame):
 365         def __init__(self, parent, id, title):
 366             wx.wxFrame.__init__(self, parent, id, title,
 367                                 wx.wxPyDefaultPosition, wx.wxSize(400, 400))
 368
 369             # Now Create the menu bar and items
 370             self.mainmenu = wx.wxMenuBar()
 371
 372             menu = wx.wxMenu()
 373             menu.Append(200, '&Print...', 'Print the current plot')
 374             wx.EVT_MENU(self, 200, self.OnFilePrint)
 375             menu.Append(209, 'E&xit', 'Enough of this already!')
 376             wx.EVT_MENU(self, 209, self.OnFileExit)
 377             self.mainmenu.Append(menu, '&File')
 378
 379             menu = wx.wxMenu()
 380             menu.Append(210, '&Draw', 'Draw plots')
 381             wx.EVT_MENU(self,210,self.OnPlotDraw)
 382             menu.Append(211, '&Redraw', 'Redraw plots')
 383             wx.EVT_MENU(self,211,self.OnPlotRedraw)
 384             menu.Append(212, '&Clear', 'Clear canvas')
 385             wx.EVT_MENU(self,212,self.OnPlotClear)
 386             self.mainmenu.Append(menu, '&Plot')
 387
 388             menu = wx.wxMenu()
 389             menu.Append(220, '&About', 'About this thing...')
 390             wx.EVT_MENU(self, 220, self.OnHelpAbout)
 391             self.mainmenu.Append(menu, '&Help')
 392
 393             self.SetMenuBar(self.mainmenu)
 394
 395             # A status bar to tell people what's happening
 396             self.CreateStatusBar(1)
 397
 398             self.client = PlotCanvas(self)
 399
 400         def OnFilePrint(self, event):
 401             d = wx.wxMessageDialog(self,
 402 """As of this writing, printing support in wxPython is shaky at best.
 403 Are you sure you want to do this?""", "Danger!", wx.wxYES_NO)
 404             if d.ShowModal() == wx.wxID_YES:
 405                 psdc = wx.wxPostScriptDC("out.ps", wx.TRUE, self)
 406                 self.client.redraw(psdc)
 407
 408         def OnFileExit(self, event):
 409             self.Close()
 410
 411         def OnPlotDraw(self, event):
 412             self.client.draw(InitObjects(),'automatic','automatic');
 413
 414         def OnPlotRedraw(self,event):
 415             self.client.redraw()
 416
 417         def OnPlotClear(self,event):
 418             self.client.last_draw = None
 419             dc = wx.wxClientDC(self.client)
 420             dc.Clear()
 421
 422         def OnHelpAbout(self, event):
 423             about = wx.wxMessageDialog(self, __doc__, "About...", wx.wxOK)
 424             about.ShowModal()
 425
 426         def OnCloseWindow(self, event):
 427             self.Destroy()
 428
 429     def InitObjects():
 430         # 100 points sin function, plotted as green circles
 431         data1 = 2.*Numeric.pi*Numeric.arange(200)/200.
 432         data1.shape = (100, 2)
 433         data1[:,1] = Numeric.sin(data1[:,0])
 434         markers1 = PolyMarker(data1, color='green', marker='circle',size=1)
 435
 436         # 50 points cos function, plotted as red line
 437         data1 = 2.*Numeric.pi*Numeric.arange(100)/100.
 438         data1.shape = (50,2)
 439         data1[:,1] = Numeric.cos(data1[:,0])
 440         lines = PolyLine(data1, color='red')
 441
 442         # A few more points...
 443         pi = Numeric.pi
 444         markers2 = PolyMarker([(0., 0.), (pi/4., 1.), (pi/2, 0.),
 445                               (3.*pi/4., -1)], color='blue',
 446                               fillcolor='green', marker='cross')
 447
 448         return PlotGraphics([markers1, lines, markers2])
 449
 450
 451     class MyApp(wx.wxApp):
 452         def OnInit(self):
 453             frame = AppFrame(wx.NULL, -1, "wxPlotCanvas")
 454             frame.Show(wx.TRUE)
 455             self.SetTopWindow(frame)
 456             return wx.TRUE
 457
 458
 459     app = MyApp(0)
 460     app.MainLoop()