# - Added functions GetClosestPoints (all curves) and GetClosestPoint (only closest curve)
# can be in either user coords or screen coords.
#
+# Nov 2004 Oliver Schoenborn (oliver.schoenborn@utoronto.ca) with
+# valuable input from and testing by Gary)
+# - Factored out "draw command" so extensions easier to implement: clean
+# separation b/w user's "draw" (Draw) and internal "draw" (_draw)
+# - Added ability to define your own ticks at PlotCanvas.Draw
+# - Added better bar charts: PolyBar class and getBarTicksGen()
+# - Put legend writing for a Poly* into Poly* class where it belongs
+# - If no legend specified or exists, no gap created
#
"""
self.currentShift= shift
# else unchanged use the current scaling
+ def drawLegend(self, dc, printerScale, symWidth, hgap, textHeight, x0, y0):
+ legend = self.getLegend()
+ if legend != '':
+ self._drawLegendSym(dc, printerScale, symWidth, x0, y0)
+ dc.DrawText(legend, x0+symWidth+hgap, y0-textHeight/2)
+ return True
+
+ return False
+
+ def _drawLegendSym(self, dc, printerScale, symWidth, x0, y0):
+ # default:
+ pnt= (x0+symWidth/2., y0)
+ self.draw(dc, printerScale, coord= _Numeric.array([pnt]))
+
def getLegend(self):
return self.attributes['legend']
colour = self.attributes['colour']
width = self.attributes['width'] * printerScale
style= self.attributes['style']
- pen = wx.Pen(wx.NamedColour(colour), width, style)
+ pen = wx.Pen(colour, width, style)
pen.SetCap(wx.CAP_BUTT)
dc.SetPen(pen)
if coord == None:
else:
dc.DrawLines(coord) # draw legend line
+ def _drawLegendSym(self, dc, printerScale, symWidth, x0, y0):
+ pnt1= (x0, y0)
+ pnt2= (x0+symWidth/1.5, y0)
+ self.draw(dc, printerScale, coord= _Numeric.array([pnt1,pnt2]))
+
def getSymExtent(self, printerScale):
"""Width and Height of Marker"""
h= self.attributes['width'] * printerScale
'colour'= 'black', - wx.Pen Colour any wx.NamedColour
'width'= 1, - Pen width
'size'= 2, - Marker size
- 'fillcolour'= same as colour, - wx.Brush Colour any wx.NamedColour
+ 'fillcolour'= same as colour, - wx.Brush Colour
'fillstyle'= wx.SOLID, - wx.Brush fill style (use wx.TRANSPARENT for no fill)
'marker'= 'circle' - Marker shape
'legend'= '' - Marker Legend to display
fillstyle = self.attributes['fillstyle']
marker = self.attributes['marker']
- dc.SetPen(wx.Pen(wx.NamedColour(colour), width))
+ dc.SetPen(wx.Pen(colour, width))
if fillcolour:
- dc.SetBrush(wx.Brush(wx.NamedColour(fillcolour),fillstyle))
+ dc.SetBrush(wx.Brush(fillcolour,fillstyle))
else:
- dc.SetBrush(wx.Brush(wx.NamedColour(colour), fillstyle))
+ dc.SetBrush(wx.Brush(colour, fillstyle))
if coord == None:
self._drawmarkers(dc, self.scaled, marker, size)
else:
lines= _Numeric.concatenate((coords,coords),axis=1)+f
dc.DrawLineList(lines.astype(_Numeric.Int32))
+class PolyBar(PolyPoints):
+ """Class to define one or more bars for bar chart. All bars in a
+ PolyBar share same style etc.
+ - All methods except __init__ are private.
+ """
+
+ _attributes = {'colour': 'black',
+ 'width': 1,
+ 'size': 2,
+ 'legend': '',
+ 'fillcolour': None,
+ 'fillstyle': wx.SOLID}
+
+ def __init__(self, points, **attr):
+ """Creates several bars.
+ points - sequence (array, tuple or list) of (x,y) points
+ indicating *top left* corner of bar. Can also be
+ just one (x,y) tuple if labels attribute is just
+ a string (not a list)
+ **attr - key word attributes
+ Defaults:
+ 'colour'= wx.BLACK, - wx.Pen Colour
+ 'width'= 1, - Pen width
+ 'size'= 2, - Bar size
+ 'fillcolour'= same as colour, - wx.Brush Colour
+ 'fillstyle'= wx.SOLID, - wx.Brush fill style (use wx.TRANSPARENT for no fill)
+ 'legend'= '' - string used for PolyBar legend
+ 'labels'= '' - string if only one point, or list of labels, one per point
+ Note that if no legend is given the label is used.
+ """
+ barPoints = [(0,0)] # needed so height of bar can be determined
+ self.labels = []
+ # add labels and points to above data members:
+ try:
+ labels = attr['labels']
+ del attr['labels']
+ except:
+ labels = None
+ if labels is None: # figure out if we have 1 point or many
+ try:
+ points[0][0] # ok: we have a seq of points
+ barPoints.extend(points)
+ except: # failed, so have just one point:
+ barPoints.append(points)
+ elif isinstance(labels, list) or isinstance(labels, tuple):
+ # labels is a sequence so points must be too, with same length:
+ self.labels.extend(labels)
+ barPoints.extend(points)
+ if len(labels) != len(points):
+ msg = "%d bar labels missing" % (len(points)-len(labels))
+ raise ValueError, msg
+ else: # label given, but only one, so must be only one point:
+ barPoints.append(points)
+ self.labels.append(labels)
+
+ PolyPoints.__init__(self, barPoints, attr)
+
+ def draw(self, dc, printerScale, coord= None):
+ colour = self.attributes['colour']
+ width = self.attributes['width'] * printerScale
+ size = self.attributes['size'] * printerScale
+ fillcolour = self.attributes['fillcolour']
+ fillstyle = self.attributes['fillstyle']
+
+ dc.SetPen(wx.Pen(colour,int(width)))
+ if fillcolour:
+ dc.SetBrush(wx.Brush(fillcolour,fillstyle))
+ else:
+ dc.SetBrush(wx.Brush(colour, fillstyle))
+ if coord == None:
+ self._drawbar(dc, self.scaled, size)
+ else:
+ self._drawLegendMarker(dc, coord, size) #draw legend marker
+
+ def _drawLegendMarker(self, dc, coord, size):
+ fact= 10
+ wh= 2*fact
+ rect= _Numeric.zeros((len(coord),4),_Numeric.Float)+[0.0,0.0,wh,wh]
+ rect[:,0:2]= coord-[fact,fact]
+ dc.DrawRectangleList(rect.astype(_Numeric.Int32))
+
+ def offset(self, heights, howMany = 1, shift=0.25):
+ """Return a list of points, where x's are those of this bar,
+ shifted by shift*howMany (in caller's units, not pixel units), and
+ heights are given in heights."""
+ points = [(point[0][0]+shift*howMany,point[1]) for point
+ in zip(self.points[1:], heights)]
+ return points
+
+ def getSymExtent(self, printerScale):
+ """Width and Height of bar symbol"""
+ s= 5*self.attributes['size'] * printerScale
+ return (s,s)
+
+ def getLegend(self):
+ """This returns a comma-separated list of bar labels (one string)"""
+ try: legendItem = self.attributes['legend']
+ except:
+ legendItem = ", ".join(self.labels)
+ return legendItem
+
+ def _drawbar(self, dc, coords, size=1):
+ width = 5.0*size
+ y0 = coords[0][1]
+ bars = []
+ for coord in coords[1:]:
+ x = coord[0] # - width/2 not as good
+ y = coord[1]
+ height = int(y0) - int(y)
+ bars.append((int(x),int(y),int(width),int(height)))
+ #print x,y,width, height
+ dc.DrawRectangleList(bars)
+
+ def getTicks(self):
+ """Get the list of (tick pos, label) pairs for this PolyBar.
+ It is unlikely you need this, but it is used by
+ getBarTicksGen."""
+ ticks = []
+ # remember to skip first point:
+ for point, label in zip(self.points[1:], self.labels):
+ ticks.append((point[0], label))
+ return ticks
+
+def getBarTicksGen(*polyBars):
+ """Get a function that can be given as xTicks argument when
+ calling PolyCanvas.Draw() when plotting one or more PolyBar.
+ The returned function allows the bar chart to have the bars
+ labelled at the x axis. """
+ ticks = []
+ for polyBar in polyBars:
+ ticks.extend(polyBar.getTicks())
+
+ def tickGenerator(lower,upper,gg,ff):
+ tickPairs = []
+ for tick in ticks:
+ if lower <= tick[0] < upper:
+ tickPairs.append(tick)
+ return tickPairs
+
+ return tickGenerator
+
+
class PlotGraphics:
"""Container to hold PolyXXX objects and graph labels
- All methods except __init__ are private.
self._hasDragged= False
# Drawing Variables
- self.last_draw = None
+ self._drawCmd = None
self._pointScale= 1
self._pointShift= 0
self._xSpec= 'auto'
def Reset(self):
"""Unzoom the plot."""
self.last_PointLabel = None #reset pointLabel
- if self.last_draw is not None:
- self.Draw(self.last_draw[0])
+ if self.BeenDrawn():
+ self._drawCmd.resetAxes(self._xSpec, self._ySpec)
+ self._draw()
def ScrollRight(self, units):
"""Move view right number of axis units."""
self.last_PointLabel = None #reset pointLabel
- if self.last_draw is not None:
- graphics, xAxis, yAxis= self.last_draw
- xAxis= (xAxis[0]+units, xAxis[1]+units)
- self.Draw(graphics,xAxis,yAxis)
+ if self.BeenDrawn():
+ self._drawCmd.scrollAxisX(units, self._xSpec)
+ self._draw()
def ScrollUp(self, units):
"""Move view up number of axis units."""
self.last_PointLabel = None #reset pointLabel
- if self.last_draw is not None:
- graphics, xAxis, yAxis= self.last_draw
- yAxis= (yAxis[0]+units, yAxis[1]+units)
- self.Draw(graphics,xAxis,yAxis)
+ if self.BeenDrawn():
+ self._drawCmd.scrollAxisY(units, self._ySpec)
+ self._draw()
def GetXY(self,event):
"""Takes a mouse event and returns the XY user axis values."""
def GetXMaxRange(self):
"""Returns (minX, maxX) x-axis range for displayed graph"""
- graphics= self.last_draw[0]
- p1, p2 = graphics.boundingBox() # min, max points of graphics
- xAxis = self._axisInterval(self._xSpec, p1[0], p2[0]) # in user units
- return xAxis
+ return self._drawCmd.getXMaxRange()
def GetYMaxRange(self):
"""Returns (minY, maxY) y-axis range for displayed graph"""
- graphics= self.last_draw[0]
- p1, p2 = graphics.boundingBox() # min, max points of graphics
- yAxis = self._axisInterval(self._ySpec, p1[1], p2[1])
- return yAxis
+ return self._drawCmd.getYMaxRange()
def GetXCurrentRange(self):
"""Returns (minX, maxX) x-axis for currently displayed portion of graph"""
- return self.last_draw[1]
+ return self._drawCmd.xAxis
def GetYCurrentRange(self):
"""Returns (minY, maxY) y-axis for currently displayed portion of graph"""
- return self.last_draw[2]
+ return self._drawCmd.yAxis
- def Draw(self, graphics, xAxis = None, yAxis = None, dc = None):
+ def BeenDrawn(self):
+ """Return true if Draw() has been called once, false otherwise."""
+ return self._drawCmd is not None
+
+ def Draw(self, graphics, xAxis = None, yAxis = None, dc = None,
+ xTicks = None, yTicks = None):
"""Draw objects in graphics with specified x and y axis.
graphics- instance of PlotGraphics with list of PolyXXX objects
xAxis - tuple with (min, max) axis range to view
yAxis - same as xAxis
dc - drawing context - doesn't have to be specified.
- If it's not, the offscreen buffer is used
+ If it's not, the offscreen buffer is used.
+ xTicks and yTicks - can be either
+ - a list of floats where the ticks should be, only visible
+ ticks will be used;
+ - a function that generates a list of (tick, label) pairs;
+ The function must be of form func(lower, upper, grid,
+ format), and the pairs must contain only ticks between lower and
+ upper. Function can use grid and format that are computed by
+ PlotCanvas, if desired, where grid is the spacing between ticks,
+ and format is the format string for how tick labels
+ will appear. See tickGeneratorDefault and
+ tickGeneratorFromList for examples of such functions.
"""
# check Axis is either tuple or none
if type(xAxis) not in [type(None),tuple]:
if type(yAxis) not in [type(None),tuple]:
raise TypeError, "yAxis should be None or (minY,maxY)"
+ self._drawCmd = DrawCmd(graphics, xAxis, yAxis,
+ self._xSpec, self._ySpec,
+ xTicks, yTicks)
+ self._draw(dc)
+
+ def _draw(self, dc=None):
+ """Implement the draw command, with dc if given, using any new
+ settings (legend toggled, axis specs, zoom, etc). """
+ assert self._drawCmd is not None
+
# check case for axis = (a,b) where a==b caused by improper zooms
- if xAxis != None:
- if xAxis[0] == xAxis[1]:
- return
- if yAxis != None:
- if yAxis[0] == yAxis[1]:
+ if self._drawCmd.isEmpty():
return
if dc == None:
# set font size for every thing but title and legend
dc.SetFont(self._getFont(self._fontSizeAxis))
- # sizes axis to axis type, create lower left and upper right corners of plot
- if xAxis == None or yAxis == None:
- # One or both axis not specified in Draw
- p1, p2 = graphics.boundingBox() # min, max points of graphics
- if xAxis == None:
- xAxis = self._axisInterval(self._xSpec, p1[0], p2[0]) # in user units
- if yAxis == None:
- yAxis = self._axisInterval(self._ySpec, p1[1], p2[1])
- # Adjust bounding box for axis spec
- p1[0],p1[1] = xAxis[0], yAxis[0] # lower left corner user scale (xmin,ymin)
- p2[0],p2[1] = xAxis[1], yAxis[1] # upper right corner user scale (xmax,ymax)
- else:
- # Both axis specified in Draw
- p1= _Numeric.array([xAxis[0], yAxis[0]]) # lower left corner user scale (xmin,ymin)
- p2= _Numeric.array([xAxis[1], yAxis[1]]) # upper right corner user scale (xmax,ymax)
-
- self.last_draw = (graphics, xAxis, yAxis) # saves most recient values
-
# Get ticks and textExtents for axis if required
if self._xSpec is not 'none':
- xticks = self._ticks(xAxis[0], xAxis[1])
+ xticks = self._drawCmd.getTicksX()
xTextExtent = dc.GetTextExtent(xticks[-1][1])# w h of x axis text last number on axis
else:
xticks = None
xTextExtent= (0,0) # No text for ticks
if self._ySpec is not 'none':
- yticks = self._ticks(yAxis[0], yAxis[1])
+ yticks = self._drawCmd.getTicksY()
yTextExtentBottom= dc.GetTextExtent(yticks[0][1])
yTextExtentTop = dc.GetTextExtent(yticks[-1][1])
yTextExtent= (max(yTextExtentBottom[0],yTextExtentTop[0]),
yTextExtent= (0,0) # No text for ticks
# TextExtents for Title and Axis Labels
+ graphics = self._drawCmd.graphics
titleWH, xLabelWH, yLabelWH= self._titleLablesWH(dc, graphics)
# TextExtents for Legend
- legendBoxWH, legendSymExt, legendTextExt = self._legendWH(dc, graphics)
+ legendBoxWH, legendSymExt, legendHGap, legendTextExt \
+ = self._legendWH(dc, graphics)
# room around graph area
rhsW= max(xTextExtent[0], legendBoxWH[0]) # use larger of number width or legend width
# drawing legend makers and text
if self._legendEnabled:
- self._drawLegend(dc,graphics,rhsW,topH,legendBoxWH, legendSymExt, legendTextExt)
+ self._drawLegend(dc,graphics,rhsW,topH,legendBoxWH,
+ legendSymExt, legendHGap, legendTextExt)
+
+ #sizes axis to axis type, create lower left and upper right corners of plot
+ p1, p2 = self._drawCmd.getBoundingBox()
# allow for scaling and shifting plotted points
scale = (self.plotbox_size-textSize_scale) / (p2-p1)* _Numeric.array((1,-1))
def Redraw(self, dc= None):
"""Redraw the existing plot."""
- if self.last_draw is not None:
- graphics, xAxis, yAxis= self.last_draw
- self.Draw(graphics,xAxis,yAxis,dc)
+ if self.BeenDrawn():
+ self._draw(dc)
def Clear(self):
"""Erase the window."""
self.last_PointLabel = None #reset pointLabel
dc = wx.BufferedDC(wx.ClientDC(self), self._Buffer)
dc.Clear()
- self.last_draw = None
+ self._drawCmd = None
def Zoom(self, Center, Ratio):
""" Zoom on the plot
Zooms by the Ratio = (Xratio, Yratio) given
"""
self.last_PointLabel = None #reset maker
- x,y = Center
- if self.last_draw != None:
- (graphics, xAxis, yAxis) = self.last_draw
- w = (xAxis[1] - xAxis[0]) * Ratio[0]
- h = (yAxis[1] - yAxis[0]) * Ratio[1]
- xAxis = ( x - w/2, x + w/2 )
- yAxis = ( y - h/2, y + h/2 )
- self.Draw(graphics, xAxis, yAxis)
+ if self.BeenDrawn():
+ self._drawCmd.zoom(Center, Ratio)
+ self._draw()
+ def ChangeAxes(self, xAxis, yAxis):
+ """Change axes specified at last Draw() command. If
+ Draw() never called yet, RuntimeError raised. """
+ if not self.BeenDrawn():
+ raise RuntimeError, "Must call Draw() at least once"
+ self._drawCmd.changeAxisX(xAxis, self._xSpec)
+ self._drawCmd.changeAxisY(yAxis, self._ySpec)
+ self._draw()
+
def GetClosestPoints(self, pntXY, pointScaled= True):
"""Returns list with
[curveNumber, legend, index of closest point, pointXY, scaledXY, distance]
if pointScaled == True based on screen coords
if pointScaled == False based on user coords
"""
- if self.last_draw == None:
+ if self.BeenDrawn():
+ return self._drawCmd.getClosestPoints(pntXY, pointScaled)
+ else:
#no graph available
return []
- graphics, xAxis, yAxis= self.last_draw
- l = []
- for curveNum,obj in enumerate(graphics):
- #check there are points in the curve
- if len(obj.points) == 0:
- continue #go to next obj
- #[curveNumber, legend, index of closest point, pointXY, scaledXY, distance]
- cn = [curveNum]+ [obj.getLegend()]+ obj.getClosestPoint( pntXY, pointScaled)
- l.append(cn)
- return l
def GetClosetPoint(self, pntXY, pointScaled= True):
"""Returns list with
# event handlers **********************************
def OnMotion(self, event):
+ if not self.BeenDrawn(): return
if self._zoomEnabled and event.LeftIsDown():
if self._hasDragged:
self._drawRubberBand(self._zoomCorner1, self._zoomCorner2) # remove old
self._drawRubberBand(self._zoomCorner1, self._zoomCorner2) # add new
def OnMouseLeftDown(self,event):
- self._zoomCorner1[0], self._zoomCorner1[1]= self.GetXY(event)
+ if self.BeenDrawn():
+ self._zoomCorner1[0], self._zoomCorner1[1]= self.GetXY(event)
def OnMouseLeftUp(self, event):
+ if not self.BeenDrawn(): return
if self._zoomEnabled:
if self._hasDragged == True:
self._drawRubberBand(self._zoomCorner1, self._zoomCorner2) # remove old
minX, minY= _Numeric.minimum( self._zoomCorner1, self._zoomCorner2)
maxX, maxY= _Numeric.maximum( self._zoomCorner1, self._zoomCorner2)
self.last_PointLabel = None #reset pointLabel
- if self.last_draw != None:
- self.Draw(self.last_draw[0], xAxis = (minX,maxX), yAxis = (minY,maxY), dc = None)
+ self._drawCmd.changeAxisX((minX,maxX))
+ self._drawCmd.changeAxisY((minY,maxY))
+ self._draw()
#else: # A box has not been drawn, zoom in on a point
## this interfered with the double click, so I've disables it.
# X,Y = self.GetXY(event)
self.last_PointLabel = None #reset pointLabel
- if self.last_draw is None:
- self.Clear()
+ if self.BeenDrawn():
+ self._draw()
else:
- graphics, xSpec, ySpec = self.last_draw
- self.Draw(graphics,xSpec,ySpec)
+ self.Clear()
def OnLeave(self, event):
"""Used to erase pointLabel when mouse outside window"""
def _printDraw(self, printDC):
"""Used for printing."""
- if self.last_draw != None:
- graphics, xSpec, ySpec= self.last_draw
- self.Draw(graphics,xSpec,ySpec,printDC)
+ if self.BeenDrawn():
+ self._draw(printDC)
def _drawPointLabel(self, mDataDict):
"""Draws and erases pointLabels"""
dc.Blit(0, 0, width, height, dcs, 0, 0, wx.EQUIV) #(NOT src) XOR dst
- def _drawLegend(self,dc,graphics,rhsW,topH,legendBoxWH, legendSymExt, legendTextExt):
+ def _drawLegend(self,dc,graphics,rhsW,topH,legendBoxWH, legendSymExt, hgap, legendTextExt):
"""Draws legend symbols and text"""
# top right hand corner of graph box is ref corner
trhc= self.plotbox_origin+ (self.plotbox_size-[rhsW,topH])*[1,-1]
legendLHS= .091* legendBoxWH[0] # border space between legend sym and graph box
lineHeight= max(legendSymExt[1], legendTextExt[1]) * 1.1 #1.1 used as space between lines
dc.SetFont(self._getFont(self._fontSizeLegend))
- for i in range(len(graphics)):
- o = graphics[i]
- s= i*lineHeight
- if isinstance(o,PolyMarker):
- # draw marker with legend
- pnt= (trhc[0]+legendLHS+legendSymExt[0]/2., trhc[1]+s+lineHeight/2.)
- o.draw(dc, self.printerScale, coord= _Numeric.array([pnt]))
- elif isinstance(o,PolyLine):
- # draw line with legend
- pnt1= (trhc[0]+legendLHS, trhc[1]+s+lineHeight/2.)
- pnt2= (trhc[0]+legendLHS+legendSymExt[0], trhc[1]+s+lineHeight/2.)
- o.draw(dc, self.printerScale, coord= _Numeric.array([pnt1,pnt2]))
- else:
- raise TypeError, "object is neither PolyMarker or PolyLine instance"
- # draw legend txt
- pnt= (trhc[0]+legendLHS+legendSymExt[0], trhc[1]+s+lineHeight/2.-legendTextExt[1]/2)
- dc.DrawText(o.getLegend(),pnt[0],pnt[1])
+ legendIdx = 0
+ for gr in graphics:
+ s = legendIdx * lineHeight
+ drew = gr.drawLegend(dc, self.printerScale,
+ legendSymExt[0], hgap, legendTextExt[1],
+ trhc[0]+legendLHS, trhc[1]+s+lineHeight/2.)
+ if drew:
+ legendIdx += 1
dc.SetFont(self._getFont(self._fontSizeAxis)) # reset
def _titleLablesWH(self, dc, graphics):
"""Returns the size in screen units for legend box"""
if self._legendEnabled != True:
legendBoxWH= symExt= txtExt= (0,0)
+ hgap= 0
else:
- # find max symbol size
+ #find max symbol size and gap b/w symbol and text
symExt= graphics.getSymExtent(self.printerScale)
+ hgap = symExt[0]*0.1
# find max legend text extent
dc.SetFont(self._getFont(self._fontSizeLegend))
txtList= graphics.getLegendNames()
txtExt= dc.GetTextExtent(txtList[0])
for txt in graphics.getLegendNames()[1:]:
txtExt= _Numeric.maximum(txtExt,dc.GetTextExtent(txt))
- maxW= symExt[0]+txtExt[0]
+ maxW= symExt[0]+hgap+txtExt[0]
maxH= max(symExt[1],txtExt[1])
# padding .1 for lhs of legend box and space between lines
maxW= maxW* 1.1
maxH= maxH* 1.1 * len(txtList)
dc.SetFont(self._getFont(self._fontSizeAxis))
legendBoxWH= (maxW,maxH)
- return (legendBoxWH, symExt, txtExt)
+ return (legendBoxWH, symExt, hgap, txtExt)
def _drawRubberBand(self, corner1, corner2):
"""Draws/erases rect box from corner1 to corner2"""
def _drawAxes(self, dc, p1, p2, scale, shift, xticks, yticks):
penWidth= self.printerScale # increases thickness for printing only
- dc.SetPen(wx.Pen(wx.NamedColour('BLACK'), penWidth))
+ dc.SetPen(wx.Pen(wx.BLACK, penWidth))
# set length of tick marks--long ones make grid
if self._gridEnabled:
pt[1]-0.5*h)
text = 0 # axis values not drawn on right side
- def _ticks(self, lower, upper):
+
+class DrawCmd:
+ """Represent a "draw" command, i.e. the one given in call to
+ PlotCanvas.Draw(). The axis specs are not saved to preserve
+ backward compatibility: they could be specified before the
+ first Draw() command."""
+ def __init__(self, graphics, xAxis, yAxis, xSpec, ySpec, xTicks, yTicks):
+ """Same args as PlotCanvas.Draw(), plus axis specs."""
+ self.graphics = graphics
+ self.xTickGen = xTicks
+ self.yTickGen = yTicks
+ self.xAxisInit, self.yAxisInit = xAxis, yAxis
+
+ self.xAxis = None
+ self.yAxis = None
+ self.changeAxisX(xAxis, xSpec)
+ self.changeAxisY(yAxis, ySpec)
+ assert self.xAxis is not None
+ assert self.yAxis is not None
+
+ def isEmpty(self):
+ """Return true if either axis has 0 size."""
+ if self.xAxis[0] == self.xAxis[1]:
+ return True
+ if self.yAxis[0] == self.yAxis[1]:
+ return True
+
+ return False
+
+ def resetAxes(self, xSpec, ySpec):
+ """Reset the axes to what they were initially, using axes specs given."""
+ self.changeAxisX(self.xAxisInit, xSpec)
+ self.changeAxisY(self.yAxisInit, ySpec)
+
+ def getBoundingBox(self):
+ """Returns p1, p2 (two pairs)"""
+ p1 = _Numeric.array((self.xAxis[0], self.yAxis[0]))
+ p2 = _Numeric.array((self.xAxis[1], self.yAxis[1]))
+ return p1, p2
+
+ def getClosestPoints(self, pntXY, pointScaled=True):
+ ll = []
+ for curveNum,obj in enumerate(self.graphics):
+ #check there are points in the curve
+ if len(obj.points) == 0:
+ continue #go to next obj
+ #[curveNumber, legend, index of closest point, pointXY, scaledXY, distance]
+ cn = [curveNum, obj.getLegend()]+\
+ obj.getClosestPoint( pntXY, pointScaled)
+ ll.append(cn)
+ return ll
+
+ def scrollAxisX(self, units, xSpec):
+ """Scroll y axis by units, using ySpec for axis spec."""
+ self.changeAxisX((self.xAxis[0]+units, self.xAxis[1]+units), xSpec)
+
+ def scrollAxisY(self, units, ySpec):
+ """Scroll y axis by units, using ySpec for axis spec."""
+ self.changeAxisY((self.yAxis[0]+units, self.yAxis[1]+units), ySpec)
+
+ def changeAxisX(self, xAxis=None, xSpec=None):
+ """Change the x axis to new given, or if None use ySpec to get it. """
+ assert type(xAxis) in [type(None),tuple]
+ if xAxis is None:
+ p1, p2 = self.graphics.boundingBox() #min, max points of graphics
+ self.xAxis = self._axisInterval(xSpec, p1[0], p2[0]) #in user units
+ else:
+ self.xAxis = xAxis
+
+ def changeAxisY(self, yAxis=None, ySpec=None):
+ """Change the y axis to new given, or if None use ySpec to get it. """
+ assert type(yAxis) in [type(None),tuple]
+ if yAxis is None:
+ p1, p2 = self.graphics.boundingBox() #min, max points of graphics
+ self.yAxis = self._axisInterval(ySpec, p1[1], p2[1])
+ else:
+ self.yAxis = yAxis
+
+ def zoom(self, center, ratio):
+ """Zoom to center and ratio."""
+ x,y = Center
+ w = (self.xAxis[1] - self.xAxis[0]) * Ratio[0]
+ h = (self.yAxis[1] - self.yAxis[0]) * Ratio[1]
+ self.xAxis = ( x - w/2, x + w/2 )
+ self.yAxis = ( y - h/2, y + h/2 )
+
+ def getXMaxRange(self):
+ p1, p2 = self.graphics.boundingBox() #min, max points of graphics
+ return self._axisInterval(self._xSpec, p1[0], p2[0]) #in user units
+
+ def getYMaxRange(self):
+ p1, p2 = self.graphics.boundingBox() #min, max points of graphics
+ return self._axisInterval(self._ySpec, p1[1], p2[1]) #in user units
+
+ def getTicksX(self):
+ """Get the ticks along y axis. Actually pairs of (t, str)."""
+ xticks = self._ticks(self.xAxis[0], self.xAxis[1], self.xTickGen)
+ if xticks == []: # try without the generator
+ xticks = self._ticks(self.xAxis[0], self.xAxis[1])
+ return xticks
+
+ def getTicksY(self):
+ """Get the ticks along y axis. Actually pairs of (t, str)."""
+ yticks = self._ticks(self.yAxis[0], self.yAxis[1], self.yTickGen)
+ if yticks == []: # try without the generator
+ yticks = self._ticks(self.yAxis[0], self.yAxis[1])
+ return yticks
+
+ def _axisInterval(self, spec, lower, upper):
+ """Returns sensible axis range for given spec."""
+ if spec == 'none' or spec == 'min':
+ if lower == upper:
+ return lower-0.5, upper+0.5
+ else:
+ return lower, upper
+ elif spec == 'auto':
+ range = upper-lower
+ if range == 0.:
+ return lower-0.5, upper+0.5
+ log = _Numeric.log10(range)
+ power = _Numeric.floor(log)
+ fraction = log-power
+ if fraction <= 0.05:
+ power = power-1
+ grid = 10.**power
+ lower = lower - lower % grid
+ mod = upper % grid
+ if mod != 0:
+ upper = upper - mod + grid
+ return lower, upper
+ elif type(spec) == type(()):
+ lower, upper = spec
+ if lower <= upper:
+ return lower, upper
+ else:
+ return upper, lower
+ else:
+ raise ValueError, str(spec) + ': illegal axis specification'
+
+ def _ticks(self, lower, upper, generator=None):
+ """Get ticks between lower and upper, using generator if given. """
ideal = (upper-lower)/7.
log = _Numeric.log10(ideal)
power = _Numeric.floor(log)
else:
digits = -int(power)
format = '%'+`digits+2`+'.'+`digits`+'f'
- ticks = []
- t = -grid*_Numeric.floor(-lower/grid)
- while t <= upper:
- ticks.append( (t, format % (t,)) )
- t = t + grid
- return ticks
+
+ if generator is None:
+ return tickGeneratorDefault(lower, upper, grid, format)
+ elif isinstance(generator, list):
+ return tickGeneratorFromList(generator, lower, upper, format)
+ else:
+ return generator(lower, upper, grid, format)
_multiples = [(2., _Numeric.log10(2.)), (5., _Numeric.log10(5.))]
+def tickGeneratorDefault(lower, upper, grid, format):
+ """Default tick generator used by PlotCanvas.Draw() if not specified."""
+ ticks = []
+ t = -grid*_Numeric.floor(-lower/grid)
+ while t <= upper:
+ ticks.append( (t, format % (t,)) )
+ t = t + grid
+ return ticks
+
+def tickGeneratorFromList(ticks, lower, upper, format):
+ """Tick generator used by PlotCanvas.Draw() if
+ a list is given for xTicks or yTicks. """
+ tickPairs = []
+ for tick in ticks:
+ if lower <= tick <= upper:
+ tickPairs.append((tick, format % tick))
+ return tickPairs
+
#-------------------------------------------------------------------------------
# Used to layout the printer page
return PlotGraphics([line1, line1g, line1b, line2, line2g, line2b],
"Bar Graph - (Turn on Grid, Legend)", "Months", "Number of Students")
+def _draw7Objects():
+ # four bars of various styles colors and sizes
+ bar1 = PolyBar((0,1), colour='green', size=4, labels='Green bar')
+ bar2 = PolyBar((2,1), colour='red', size=7, labels='Red bar',
+ fillstyle=wx.CROSSDIAG_HATCH)
+ bar3 = PolyBar([(1,3),(3,4)], colour='blue',
+ labels=['Blue bar 1', 'Blue bar 2'],
+ fillstyle=wx.TRANSPARENT)
+ bars = [bar1, bar2, bar3]
+ return PlotGraphics(bars,
+ "Graph Title", "Bar names", "Bar height"), getBarTicksGen(*bars)
+
+def _draw8Objects():
+ # four bars in two groups, overlayed to a line plot
+ x1,x2 = 0.0,0.5
+ bar1 = PolyBar([(x1,1.),(x1+2,2.)], colour='green', size=4,
+ legend="1998", fillstyle=wx.CROSSDIAG_HATCH)
+ bar2 = PolyBar(bar1.offset([1.2,2.5]), colour='red', size=7,
+ legend="2000", labels=['cars','trucks'])
+ line1 = PolyLine([(x1,1.5), (x2,1.2), (x1+2,1), (x2+2,2)], colour='blue')
+ return PlotGraphics([bar1, bar2, line1],
+ "Graph Title", "Bar names", "Bar height"), getBarTicksGen(bar1, bar2)
class TestFrame(wx.Frame):
def __init__(self, parent, id, title):
self.Bind(wx.EVT_MENU,self.OnPlotDraw5, id=210)
menu.Append(260, 'Draw6', 'Draw plots6')
self.Bind(wx.EVT_MENU,self.OnPlotDraw6, id=260)
+ menu.Append(261, 'Draw7', 'Draw plots7')
+ self.Bind(wx.EVT_MENU,self.OnPlotDraw7, id=261)
+ menu.Append(262, 'Draw8', 'Draw plots8')
+ self.Bind(wx.EVT_MENU,self.OnPlotDraw8, id=262)
menu.Append(211, '&Redraw', 'Redraw plots')
self.client.SetYSpec('auto')
self.client.Draw(_draw6Objects(), xAxis= (0,7))
+ def OnPlotDraw7(self, event):
+ #Bar Graph and custom ticks Example, using PolyBar
+ self.resetDefaults()
+ bars, tickGenerator = _draw7Objects()
+ #note that yTicks is not necessary here, used only
+ #to show off custom ticks
+ self.client.Draw(bars, xAxis=(0,4),yAxis = (0,5),
+ xTicks=tickGenerator, yTicks=[0,1,3])
+
+ def OnPlotDraw8(self, event):
+ #Bar Graph and custom ticks Example, using PolyBar
+ self.resetDefaults()
+ plot, tickGenerator = _draw8Objects()
+ self.client.Draw(plot, xAxis=(0,4),yAxis = (0,5), xTicks=tickGenerator)
+
+
def OnPlotRedraw(self,event):
self.client.Redraw()
self.client.Clear()
def OnPlotScale(self, event):
- if self.client.last_draw != None:
- graphics, xAxis, yAxis= self.client.last_draw
- self.client.Draw(graphics,(1,3.05),(0,1))
+ if self.client.BeenDrawn():
+ self.client.ChangeAxes((1,3.05),(0,1))
+
def OnEnableZoom(self, event):
self.client.SetEnableZoom(event.IsChecked())
projects / wxWidgets.git / commitdiff
