def swaplines(self, painter, a1, b1, a2, b2):
"""Multiline version of swapline where a1, b1, a2, b2 are arrays."""
if self.settings.direction == 'horizontal':
a = (a1, b1, a2, b2)
else:
a = (b1, a1, b2, a2)
utils.plotLinesToPainter(painter, a[0], a[1], a[2], a[3])
def _errorBarsBar(style, xmin, xmax, ymin, ymax, xplotter, yplotter, s, painter, clip):
"""Draw bar style error lines."""
# vertical error bars
if ymin is not None and ymax is not None and not s.ErrorBarLine.hideVert:
utils.plotLinesToPainter(painter, xplotter, ymin, xplotter, ymax, clip)
# horizontal error bars
if xmin is not None and xmax is not None and not s.ErrorBarLine.hideHorz:
utils.plotLinesToPainter(painter, xmin, yplotter, xmax, yplotter, clip)
def _errorBarsBar(style, xmin, xmax, ymin, ymax, xplotter, yplotter, s,
painter, clip):
"""Draw bar style error lines."""
# vertical error bars
if ymin is not None and ymax is not None and not s.ErrorBarLine.hideVert:
utils.plotLinesToPainter(painter, xplotter, ymin, xplotter, ymax, clip)
# horizontal error bars
if xmin is not None and xmax is not None and not s.ErrorBarLine.hideHorz:
utils.plotLinesToPainter(painter, xmin, yplotter, xmax, yplotter, clip)
def _errorBarsEnds(style, xmin, xmax, ymin, ymax, xplotter, yplotter, s, painter, clip):
"""Draw perpendiclar ends on error bars."""
size = s.get("markerSize").convert(painter) * s.ErrorBarLine.endsize
if ymin is not None and ymax is not None and not s.ErrorBarLine.hideVert:
utils.plotLinesToPainter(painter, xplotter - size, ymin, xplotter + size, ymin, clip)
utils.plotLinesToPainter(painter, xplotter - size, ymax, xplotter + size, ymax, clip)
if xmin is not None and xmax is not None and not s.ErrorBarLine.hideHorz:
utils.plotLinesToPainter(painter, xmin, yplotter - size, xmin, yplotter + size, clip)
utils.plotLinesToPainter(painter, xmax, yplotter - size, xmax, yplotter + size, clip)
def _errorBarsEnds(style, xmin, xmax, ymin, ymax, xplotter, yplotter, s,
painter, clip):
"""Draw perpendiclar ends on error bars."""
size = (s.get('markerSize').convert(painter) * s.ErrorBarLine.endsize)
if ymin is not None and ymax is not None and not s.ErrorBarLine.hideVert:
utils.plotLinesToPainter(painter, xplotter - size, ymin,
xplotter + size, ymin, clip)
utils.plotLinesToPainter(painter, xplotter - size, ymax,
xplotter + size, ymax, clip)
if xmin is not None and xmax is not None and not s.ErrorBarLine.hideHorz:
utils.plotLinesToPainter(painter, xmin, yplotter - size, xmin,
yplotter + size, clip)
utils.plotLinesToPainter(painter, xmax, yplotter - size, xmax,
yplotter + size, clip)
def dataDraw(self, painter, axes, posn, cliprect):
"""Draw the widget."""
s = self.settings
d = self.document
# ignore non existing datasets
try:
data1 = d.data[s.data1]
data2 = d.data[s.data2]
except KeyError:
return
# require 2d datasets
if data1.dimensions != 2 or data2.dimensions != 2:
return
# get base length (ensure > 0)
baselength = max(s.get('baselength').convert(painter), 1e-6)
# try to be nice if the datasets don't match
data1st, data2nd = data1.data, data2.data
xw = min(data1st.shape[1], data2nd.shape[1])
yw = min(data1st.shape[0], data2nd.shape[0])
# construct indices into datasets
yvals, xvals = N.mgrid[0:yw, 0:xw]
# convert using 1st dataset to axes values
xdsvals, ydsvals = data1.indexToPoint(xvals.ravel(), yvals.ravel())
# convert using axes to plotter values
xplotter = axes[0].dataToPlotterCoords(posn, xdsvals)
yplotter = axes[1].dataToPlotterCoords(posn, ydsvals)
pen = s.Line.makeQPenWHide(painter)
painter.setPen(pen)
if s.mode == 'cartesian':
dx = (data1st[:yw, :xw] * baselength).ravel()
dy = (data2nd[:yw, :xw] * baselength).ravel()
elif s.mode == 'polar':
r = data1st[:yw, :xw].ravel() * baselength
theta = data2nd[:yw, :xw].ravel()
dx = r * N.cos(theta)
dy = r * N.sin(theta)
x1, x2 = xplotter-dx, xplotter+dx
y1, y2 = yplotter+dy, yplotter-dy
if s.arrowfront == 'none' and s.arrowback == 'none':
utils.plotLinesToPainter(painter, x1, y1, x2, y2,
cliprect)
else:
arrowsize = s.get('arrowsize').convert(painter)
painter.setBrush( s.get('Fill').makeQBrushWHide() )
# this is backward - have to convert from dx, dy to angle, length
angles = 180 - N.arctan2(dy, dx) * (180./N.pi)
lengths = N.sqrt(dx**2+dy**2) * 2
# scale arrow heads by arrow length if requested
if s.scalearrow:
arrowsizes = (arrowsize/baselength/2) * lengths
else:
arrowsizes = N.zeros(lengths.shape) + arrowsize
for x, y, l, a, asize in itertools.izip(x2, y2, lengths, angles,
arrowsizes):
if l != 0.:
utils.plotLineArrow(painter, x, y, l, a, asize,
arrowleft=s.arrowfront,
arrowright=s.arrowback)
def _drawTickSet(self, painter, tickSetn, gridSetn,
tickbot, tickleft, tickright,
tickLabelSetn=None, labelSetn=None):
'''Draw a set of ticks (major or minor).
tickSetn: tick setting to get line details
gridSetn: setting for grid line (if any)
tickXXX: tick arrays for each axis
tickLabelSetn: setting used to label ticks, or None if minor ticks
labelSetn: setting for labels, if any
'''
# this is mostly a lot of annoying trigonometry
# compute line ends for ticks and grid lines
tl = tickSetn.get('length').convert(painter)
mv = self._maxVal()
reverse = bool(self.settings.reverse)
revsign = [1, -1][reverse]
# bottom ticks
x1 = (tickbot - self._orgbot)/self._size*self._width + self._box[0]
y1 = self._box[3] + N.zeros(x1.shape)
x2 = x1 - revsign * tl * sin30
y2 = y1 + tl * cos30
tickbotline = (x1, y1, x2, y2)
# bottom grid (removing lines at edge of plot)
scaletick = 1 - (tickbot-self._orgbot)/self._size
gx = x1 + scaletick*self._width*sin30
gy = y1 - scaletick*self._width*cos30
ne = (scaletick > 1e-6) & (scaletick < (1-1e-6))
gridbotline = (x1[ne], y1[ne], gx[ne], gy[ne])
# left ticks
x1 = -(tickleft - self._orgleft)/self._size*self._width*sin30 + (
self._box[0] + self._box[2])*0.5
y1 = (tickleft - self._orgleft)/self._size*self._width*cos30 + self._box[1]
if reverse:
x2 = x1 - tl
y2 = y1
else:
x2 = x1 - tl * sin30
y2 = y1 - tl * cos30
tickleftline = (x1, y1, x2, y2)
# left grid
scaletick = 1 - (tickleft-self._orgleft)/self._size
gx = x1 + scaletick*self._width*sin30
gy = self._box[3] + N.zeros(y1.shape)
ne = (scaletick > 1e-6) & (scaletick < (1-1e-6))
gridleftline = (x1[ne], y1[ne], gx[ne], gy[ne])
# right ticks
x1 = -(tickright - self._orgright)/self._size*self._width*sin30+self._box[2]
y1 = -(tickright - self._orgright)/self._size*self._width*cos30+self._box[3]
if reverse:
x2 = x1 + tl * sin30
y2 = y1 - tl * cos30
else:
x2 = x1 + tl
y2 = y1
tickrightline = (x1, y1, x2, y2)
# right grid
scaletick = 1 - (tickright-self._orgright)/self._size
gx = x1 - scaletick*self._width
gy = y1
gridrightline = (x1[ne], y1[ne], gx[ne], gy[ne])
if not gridSetn.hide:
# draw the grid
pen = gridSetn.makeQPen(painter)
painter.setPen(pen)
utils.plotLinesToPainter(painter, *gridbotline)
utils.plotLinesToPainter(painter, *gridleftline)
utils.plotLinesToPainter(painter, *gridrightline)
# calculate deltas for ticks
bdelta = ldelta = rdelta = 0
if not tickSetn.hide:
# draw ticks themselves
pen = tickSetn.makeQPen(painter)
pen.setCapStyle(qt4.Qt.FlatCap)
painter.setPen(pen)
utils.plotLinesToPainter(painter, *tickbotline)
utils.plotLinesToPainter(painter, *tickleftline)
utils.plotLinesToPainter(painter, *tickrightline)
ldelta += tl*sin30
bdelta += tl*cos30
rdelta += tl
if tickLabelSetn is not None and not tickLabelSetn.hide:
# compute the labels for the ticks
tleftlabels = self._getLabels(tickleft*mv, '%Vg')
trightlabels = self._getLabels(tickright*mv, '%Vg')
tbotlabels = self._getLabels(tickbot*mv, '%Vg')
painter.setPen( tickLabelSetn.makeQPen() )
font = tickLabelSetn.makeQFont(painter)
painter.setFont(font)
fm = utils.FontMetrics(font, painter.device())
sp = fm.leading() + fm.descent()
off = tickLabelSetn.get('offset').convert(painter)
# draw tick labels in each direction
hlabbot = wlableft = wlabright = 0
for l, x, y in izip(tbotlabels, tickbotline[2], tickbotline[3]+off):
r = utils.Renderer(painter, font, x, y, l, 0, 1, 0)
bounds = r.render()
hlabbot = max(hlabbot, bounds[3]-bounds[1])
for l, x, y in izip(tleftlabels, tickleftline[2]-off-sp, tickleftline[3]):
r = utils.Renderer(painter, font, x, y, l, 1, 0, 0)
bounds = r.render()
wlableft = max(wlableft, bounds[2]-bounds[0])
for l, x, y in izip(trightlabels,tickrightline[2]+off+sp, tickrightline[3]):
r = utils.Renderer(painter, font, x, y, l, -1, 0, 0)
bounds = r.render()
wlabright = max(wlabright, bounds[2]-bounds[0])
bdelta += hlabbot+off+sp
ldelta += wlableft+off+sp
rdelta += wlabright+off+sp
if labelSetn is not None and not labelSetn.hide:
# draw label on edges (if requested)
painter.setPen( labelSetn.makeQPen() )
font = labelSetn.makeQFont(painter)
painter.setFont(font)
fm = utils.FontMetrics(font, painter.device())
sp = fm.leading() + fm.descent()
off = labelSetn.get('offset').convert(painter)
# bottom label
r = utils.Renderer(painter, font,
self._box[0]+self._width/2,
self._box[3] + bdelta + off,
self.settings.labelbottom,
0, 1)
r.render()
# left label - rotate frame before drawing so we can get
# the bounds correct
r = utils.Renderer(painter, font, 0, -sp,
self.settings.labelleft,
0, -1)
painter.save()
painter.translate(self._box[0]+self._width*0.25 - ldelta - off,
0.5*(self._box[1]+self._box[3]))
painter.rotate(-60)
r.render()
painter.restore()
# right label
r = utils.Renderer(painter, font, 0, -sp,
self.settings.labelright,
0, -1)
painter.save()
painter.translate(self._box[0]+self._width*0.75 + ldelta + off,
0.5*(self._box[1]+self._box[3]))
painter.rotate(60)
r.render()
painter.restore()
def drawErrorBars(self, painter, posns, barwidth,
yvals, dataset, axes, widgetposn):
"""Draw (optional) error bars on bars."""
s = self.settings
if s.errorstyle == 'none':
return
minval, maxval = self.calculateErrorBars(dataset, yvals)
if minval is None and maxval is None:
return
# handle one sided errors
if minval is None:
minval = yvals
if maxval is None:
maxval = yvals
# convert errors to coordinates
ishorz = s.direction == 'horizontal'
mincoord = axes[not ishorz].dataToPlotterCoords(widgetposn, minval)
mincoord = N.clip(mincoord, -32767, 32767)
maxcoord = axes[not ishorz].dataToPlotterCoords(widgetposn, maxval)
maxcoord = N.clip(maxcoord, -32767, 32767)
# draw error bars
painter.setPen( self.settings.ErrorBarLine.makeQPenWHide(painter) )
w = barwidth*0.25
if ishorz:
utils.plotLinesToPainter(painter, mincoord, posns,
maxcoord, posns)
if s.errorstyle == 'barends':
utils.plotLinesToPainter(painter, mincoord, posns-w,
mincoord, posns+w)
utils.plotLinesToPainter(painter, maxcoord, posns-w,
maxcoord, posns+w)
else:
utils.plotLinesToPainter(painter, posns, mincoord,
posns, maxcoord)
if s.errorstyle == 'barends':
utils.plotLinesToPainter(painter, posns-w, mincoord,
posns+w, mincoord)
utils.plotLinesToPainter(painter, posns-w, maxcoord,
posns+w, maxcoord)
def drawErrorBars(self, painter, posns, barwidth, yvals, dataset, axes,
widgetposn):
"""Draw (optional) error bars on bars."""
s = self.settings
if s.errorstyle == 'none':
return
minval, maxval = self.calculateErrorBars(dataset, yvals)
if minval is None and maxval is None:
return
# handle one sided errors
if minval is None:
minval = yvals
if maxval is None:
maxval = yvals
# convert errors to coordinates
ishorz = s.direction == 'horizontal'
mincoord = axes[not ishorz].dataToPlotterCoords(widgetposn, minval)
mincoord = N.clip(mincoord, -32767, 32767)
maxcoord = axes[not ishorz].dataToPlotterCoords(widgetposn, maxval)
maxcoord = N.clip(maxcoord, -32767, 32767)
# draw error bars
painter.setPen(self.settings.ErrorBarLine.makeQPenWHide(painter))
w = barwidth * 0.25
if ishorz:
utils.plotLinesToPainter(painter, mincoord, posns, maxcoord, posns)
if s.errorstyle == 'barends':
utils.plotLinesToPainter(painter, mincoord, posns - w,
mincoord, posns + w)
utils.plotLinesToPainter(painter, maxcoord, posns - w,
maxcoord, posns + w)
else:
utils.plotLinesToPainter(painter, posns, mincoord, posns, maxcoord)
if s.errorstyle == 'barends':
utils.plotLinesToPainter(painter, posns - w, mincoord,
posns + w, mincoord)
utils.plotLinesToPainter(painter, posns - w, maxcoord,
posns + w, maxcoord)
def _drawTickSet(self, painter, tickSetn, gridSetn,
tickbot, tickleft, tickright,
tickLabelSetn=None, labelSetn=None):
'''Draw a set of ticks (major or minor).
tickSetn: tick setting to get line details
gridSetn: setting for grid line (if any)
tickXXX: tick arrays for each axis
tickLabelSetn: setting used to label ticks, or None if minor ticks
labelSetn: setting for labels, if any
'''
# this is mostly a lot of annoying trigonometry
# compute line ends for ticks and grid lines
tl = tickSetn.get('length').convert(painter)
mv = self._maxVal()
# bottom ticks
x1 = (tickbot - self._orgbot)/self._size*self._width + self._box[0]
x2 = x1 - tl * sin30
y1 = self._box[3] + N.zeros(x1.shape)
y2 = y1 + tl * cos30
tickbotline = (x1, y1, x2, y2)
# bottom grid (removing lines at edge of plot)
scaletick = 1 - (tickbot-self._orgbot)/self._size
gx = x1 + scaletick*self._width*sin30
gy = y1 - scaletick*self._width*cos30
ne = (scaletick > 1e-6) & (scaletick < (1-1e-6))
gridbotline = (x1[ne], y1[ne], gx[ne], gy[ne])
# left ticks
x1 = -(tickleft - self._orgleft)/self._size*self._width*sin30 + (
self._box[0] + self._box[2])*0.5
x2 = x1 - tl * sin30
y1 = (tickleft - self._orgleft)/self._size*self._width*cos30 + self._box[1]
y2 = y1 - tl * cos30
tickleftline = (x1, y1, x2, y2)
# left grid
scaletick = 1 - (tickleft-self._orgleft)/self._size
gx = x1 + scaletick*self._width*sin30
gy = self._box[3] + N.zeros(y1.shape)
ne = (scaletick > 1e-6) & (scaletick < (1-1e-6))
gridleftline = (x1[ne], y1[ne], gx[ne], gy[ne])
# right ticks
x1 = -(tickright - self._orgright)/self._size*self._width*sin30+self._box[2]
x2 = x1 + tl
y1 = -(tickright - self._orgright)/self._size*self._width*cos30+self._box[3]
y2 = y1
tickrightline = (x1, y1, x2, y2)
# right grid
scaletick = 1 - (tickright-self._orgright)/self._size
gx = x1 - scaletick*self._width
gy = y1
gridrightline = (x1[ne], y1[ne], gx[ne], gy[ne])
if not gridSetn.hide:
# draw the grid
pen = gridSetn.makeQPen(painter)
painter.setPen(pen)
utils.plotLinesToPainter(painter, *gridbotline)
utils.plotLinesToPainter(painter, *gridleftline)
utils.plotLinesToPainter(painter, *gridrightline)
# calculate deltas for ticks
bdelta = ldelta = rdelta = 0
if not tickSetn.hide:
# draw ticks themselves
pen = tickSetn.makeQPen(painter)
pen.setCapStyle(qt4.Qt.FlatCap)
painter.setPen(pen)
utils.plotLinesToPainter(painter, *tickbotline)
utils.plotLinesToPainter(painter, *tickleftline)
utils.plotLinesToPainter(painter, *tickrightline)
ldelta += tl*sin30
bdelta += tl*cos30
rdelta += tl
if tickLabelSetn is not None and not tickLabelSetn.hide:
# compute the labels for the ticks
tleftlabels = self._getLabels(tickleft*mv, '%Vg')
trightlabels = self._getLabels(tickright*mv, '%Vg')
tbotlabels = self._getLabels(tickbot*mv, '%Vg')
painter.setPen( tickLabelSetn.makeQPen() )
font = tickLabelSetn.makeQFont(painter)
painter.setFont(font)
fm = utils.FontMetrics(font, painter.device())
sp = fm.leading() + fm.descent()
off = tickLabelSetn.get('offset').convert(painter)
# draw tick labels in each direction
hlabbot = wlableft = wlabright = 0
for l, x, y in izip(tbotlabels, tickbotline[2], tickbotline[3]+off):
r = utils.Renderer(painter, font, x, y, l, 0, 1, 0)
bounds = r.render()
hlabbot = max(hlabbot, bounds[3]-bounds[1])
for l, x, y in izip(tleftlabels, tickleftline[2]-off-sp, tickleftline[3]):
r = utils.Renderer(painter, font, x, y, l, 1, 0, 0)
bounds = r.render()
wlableft = max(wlableft, bounds[2]-bounds[0])
for l, x, y in izip(trightlabels,tickrightline[2]+off+sp, tickrightline[3]):
r = utils.Renderer(painter, font, x, y, l, -1, 0, 0)
bounds = r.render()
wlabright = max(wlabright, bounds[2]-bounds[0])
bdelta += hlabbot+off+sp
ldelta += wlableft+off+sp
rdelta += wlabright+off+sp
if labelSetn is not None and not labelSetn.hide:
# draw label on edges (if requested)
painter.setPen( labelSetn.makeQPen() )
font = labelSetn.makeQFont(painter)
painter.setFont(font)
fm = utils.FontMetrics(font, painter.device())
sp = fm.leading() + fm.descent()
off = labelSetn.get('offset').convert(painter)
# bottom label
r = utils.Renderer(painter, font,
self._box[0]+self._width/2,
self._box[3] + bdelta + off,
self.settings.labelbottom,
0, 1)
r.render()
# left label - rotate frame before drawing so we can get
# the bounds correct
r = utils.Renderer(painter, font, 0, -sp,
self.settings.labelleft,
0, -1)
painter.save()
painter.translate(self._box[0]+self._width*0.25 - ldelta - off,
0.5*(self._box[1]+self._box[3]))
painter.rotate(-60)
r.render()
painter.restore()
# right label
r = utils.Renderer(painter, font, 0, -sp,
self.settings.labelright,
0, -1)
painter.save()
painter.translate(self._box[0]+self._width*0.75 + ldelta + off,
0.5*(self._box[1]+self._box[3]))
painter.rotate(60)
r.render()
painter.restore()
def draw(self, parentposn, phelper, outerbounds=None):
"""Draw the widget."""
posn = plotters.GenericPlotter.draw(self,
parentposn,
phelper,
outerbounds=outerbounds)
x1, y1, x2, y2 = posn
s = self.settings
d = self.document
# hide if hidden!
if s.hide:
return
# get axes widgets
axes = self.parent.getAxes((s.xAxis, s.yAxis))
# return if there's no proper axes
if (None in axes or axes[0].settings.direction != 'horizontal'
or axes[1].settings.direction != 'vertical'):
return
# ignore non existing datasets
try:
data1 = d.data[s.data1]
data2 = d.data[s.data2]
except KeyError:
return
# require 2d datasets
if data1.dimensions != 2 or data2.dimensions != 2:
return
# clip data within bounds of plotter
cliprect = self.clipAxesBounds(axes, posn)
painter = phelper.painter(self, posn, clip=cliprect)
# get base length (ensure > 0)
baselength = max(s.get('baselength').convert(painter), 1e-6)
# try to be nice if the datasets don't match
data1st, data2nd = data1.data, data2.data
xw = min(data1st.shape[1], data2nd.shape[1])
yw = min(data1st.shape[0], data2nd.shape[0])
# construct indices into datasets
yvals, xvals = N.mgrid[0:yw, 0:xw]
# convert using 1st dataset to axes values
xdsvals, ydsvals = data1.indexToPoint(xvals.ravel(), yvals.ravel())
# convert using axes to plotter values
xplotter = axes[0].dataToPlotterCoords(posn, xdsvals)
yplotter = axes[1].dataToPlotterCoords(posn, ydsvals)
pen = s.Line.makeQPenWHide(painter)
painter.setPen(pen)
if s.mode == 'cartesian':
dx = (data1st[:yw, :xw] * baselength).ravel()
dy = (data2nd[:yw, :xw] * baselength).ravel()
elif s.mode == 'polar':
r = data1st[:yw, :xw].ravel() * baselength
theta = data2nd[:yw, :xw].ravel()
dx = r * N.cos(theta)
dy = r * N.sin(theta)
x1, x2 = xplotter - dx, xplotter + dx
y1, y2 = yplotter + dy, yplotter - dy
if s.arrowfront == 'none' and s.arrowback == 'none':
utils.plotLinesToPainter(painter, x1, y1, x2, y2, cliprect)
else:
arrowsize = s.get('arrowsize').convert(painter)
painter.setBrush(s.get('Fill').makeQBrushWHide())
# this is backward - have to convert from dx, dy to angle, length
angles = 180 - N.arctan2(dy, dx) * (180. / N.pi)
lengths = N.sqrt(dx**2 + dy**2) * 2
# scale arrow heads by arrow length if requested
if s.scalearrow:
arrowsizes = (arrowsize / baselength / 2) * lengths
else:
arrowsizes = N.zeros(lengths.shape) + arrowsize
for x, y, l, a, asize in itertools.izip(x2, y2, lengths, angles,
arrowsizes):
if l != 0.:
utils.plotLineArrow(painter,
x,
y,
l,
a,
asize,
arrowleft=s.arrowfront,
arrowright=s.arrowback)
def draw(self, parentposn, phelper, outerbounds = None):
"""Draw the widget."""
posn = plotters.GenericPlotter.draw(self, parentposn, phelper,
outerbounds = outerbounds)
x1, y1, x2, y2 = posn
s = self.settings
d = self.document
# hide if hidden!
if s.hide:
return
# get axes widgets
axes = self.parent.getAxes( (s.xAxis, s.yAxis) )
# return if there's no proper axes
if ( None in axes or
axes[0].settings.direction != 'horizontal' or
axes[1].settings.direction != 'vertical' ):
return
# ignore non existing datasets
try:
data1 = d.data[s.data1]
data2 = d.data[s.data2]
except KeyError:
return
# require 2d datasets
if data1.dimensions != 2 or data2.dimensions != 2:
return
# clip data within bounds of plotter
cliprect = self.clipAxesBounds(axes, posn)
painter = phelper.painter(self, posn, clip=cliprect)
baselength = s.get('baselength').convert(painter)
# try to be nice if the datasets don't match
data1st, data2nd = data1.data, data2.data
xw = min(data1st.shape[1], data2nd.shape[1])
yw = min(data1st.shape[0], data2nd.shape[0])
# construct indices into datasets
yvals, xvals = N.mgrid[0:yw, 0:xw]
# convert using 1st dataset to axes values
xdsvals, ydsvals = data1.indexToPoint(xvals.ravel(), yvals.ravel())
# convert using axes to plotter values
xplotter = axes[0].dataToPlotterCoords(posn, xdsvals)
yplotter = axes[1].dataToPlotterCoords(posn, ydsvals)
pen = s.Line.makeQPenWHide(painter)
painter.setPen(pen)
if s.mode == 'cartesian':
dx = (data1st[:yw, :xw] * baselength).ravel()
dy = (data2nd[:yw, :xw] * baselength).ravel()
elif s.mode == 'polar':
r = data1st[:yw, :xw].ravel() * baselength
theta = data2nd[:yw, :xw].ravel()
dx = r * N.cos(theta)
dy = r * N.sin(theta)
x1, x2 = xplotter-dx, xplotter+dx
y1, y2 = yplotter+dy, yplotter-dy
if s.arrowfront == 'none' and s.arrowback == 'none':
utils.plotLinesToPainter(painter, x1, y1, x2, y2,
cliprect)
else:
arrowsize = s.get('arrowsize').convert(painter)
painter.setBrush( s.get('Fill').makeQBrushWHide() )
# this is backward - have to convert from dx, dy to angle, length
angles = 180 - N.arctan2(dy, dx) * (180./N.pi)
lengths = N.sqrt(dx**2+dy**2) * 2
# scale arrow heads by arrow length if requested
if s.scalearrow:
arrowsizes = (arrowsize/baselength/2) * lengths
else:
arrowsizes = N.zeros(lengths.shape) + arrowsize
for x, y, l, a, asize in itertools.izip(x2, y2, lengths, angles,
arrowsizes):
utils.plotLineArrow(painter, x, y, l, a, asize,
arrowleft=s.arrowfront,
arrowright=s.arrowback)