def wheelEvent(self, ev, axis=None):
ev.accept()
# s is actual scaling factor
s = 1.02**(ev.delta() * self.state['wheelScaleFactor'])
current_view = self.viewRect()
#if only one node visible and wants to zoom in - not allowed
if not (self.is_1_or_less(current_view) and s < 1):
#if all visible and wants to zoom out - not allowed
if self.is_all_visible(current_range=self.viewRange()) and s > 1:
pass
else:
center = pg.QtCore.QPointF(
fn.invertQTransform(self.childGroup.transform()).map(
ev.pos()))
if self.canopy_pespective: #changing center to ensure fixed canopy
# max y-value of graph aka canopy
max_y_coord = max(self.y_coords)
center = pg.QtCore.QPointF(center.x(), max_y_coord)
self._resetTarget()
if (ev.modifiers() & QtCore.Qt.ShiftModifier):
self.scaleBy(x=s, center=center)
elif (ev.modifiers() & QtCore.Qt.ControlModifier):
self.scaleBy(y=s, center=center)
else:
self.scaleBy(s=s, center=center)
def wheelEvent(self, ev, axis=None):
if axis in (0, 1):
mask = [False, False]
mask[axis] = self.state['mouseEnabled'][axis]
else:
mask = self.state['mouseEnabled'][:]
s = 1.02**(ev.delta() * self.state['wheelScaleFactor']
) # actual scaling factor
s = [(None if m is False else s) for m in mask]
center = Point(
fn.invertQTransform(self.childGroup.transform()).map(ev.pos()))
# JC added
if ev.modifiers(
) == QtCore.Qt.ShiftModifier and s[0] is not None and s[1] is not None:
for child in self.childGroup.childItems()[:]:
if hasattr(child, 'accept_mousewheel_transformations'):
m_old = child.transform()
m = QtGui.QTransform()
print(1, m_old.m22(), s[1])
m.scale(1, m_old.m22() * s[1])
child.setTransform(m)
ev.accept()
child_group_transformation = self.childGroup.transform()
# self.childGroup.update()
# self.autoRange()
# self.updateAutoRange()
# self.sigTransformChanged.emit(self) ## segfaults here: 1
print(self.viewRange())
print(self.targetRange())
return
self._resetTarget()
self.scaleBy(s, center)
ev.accept()
self.sigRangeChangedManually.emit(mask)
def wheelEvent(self, ev, axis=None):
mask = np.array(self.state['mouseEnabled'], dtype=np.float)
if axis is not None and axis >= 0 and axis < len(mask):
mv = mask[axis]
mask[:] = 0
mask[axis] = mv
angleDelta = ev.angleDelta().y(
) if ev.angleDelta().y() != 0 else ev.angleDelta().x()
if isinstance(ev, QWheelEvent):
s = ((mask * 0.02) +
1)**(angleDelta * self.state['wheelScaleFactor']
) # actual scaling factor
else:
s = ((mask * 0.02) +
1)**(ev.delta() * self.state['wheelScaleFactor']
) # actual scaling factor
center = Point(
fn.invertQTransform(self.childGroup.transform()).map(ev.pos()))
# center = ev.pos()
self._resetTarget()
self.scaleBy(s, center)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
ev.accept()
def pixelHeight(self):
## deprecated
vt = self.deviceTransform()
if vt is None:
return 0
vt = fn.invertQTransform(vt)
return vt.map(QtCore.QLineF(0, 0, 0, 1)).length()
def pixelHeight(self):
## deprecated
vt = self.deviceTransform()
if vt is None:
return 0
vt = fn.invertQTransform(vt)
return vt.map(QtCore.QLineF(0, 0, 0, 1)).length()
def wheelEvent(self, ev, axis=None):
"""Override wheel event so we manually track changes of zoom and
update map accordingly."""
delta = 0.5 * np.sign(ev.delta())
self.__zoom_level = self.__clipped_zoom(self.__zoom_level + delta)
center = Point(fn.invertQTransform(self.childGroup.transform()).map(ev.pos()))
self.match_zoom(center, offset=True)
ev.accept()
def mapRectFromDevice(self, rect):
"""
Return *rect* mapped from device coordinates (pixels) to local coordinates.
If there is no device mapping available, return None.
"""
vt = self.deviceTransform()
if vt is None:
return None
vt = fn.invertQTransform(vt)
return vt.mapRect(rect)
def mapRectFromDevice(self, rect):
"""
Return *rect* mapped from device coordinates (pixels) to local coordinates.
If there is no device mapping available, return None.
"""
vt = self.deviceTransform()
if vt is None:
return None
vt = fn.invertQTransform(vt)
return vt.mapRect(rect)
def mouseDragEvent(self, ev, axis=None):
## Scale or translate based on mouse button
##leftdrag = pan || rightdrag = zoom
if ev.button() & (QtCore.Qt.LeftButton | QtCore.Qt.MidButton):
ev.accept()
pos = ev.pos(
) #comes in terms of viewport position (topleft is 0, 0)
lastPos = ev.lastPos()
dif = self.mapToView(pos) - self.mapToView(
lastPos) #converts to graph's coord
#print(self.mapFromDevice((pos-lastPos)))
self._resetTarget()
if self.canopy_pespective:
self.translateBy(x=-dif.x())
else:
self.translateBy(x=-dif.x(), y=-dif.y())
elif ev.button() & QtCore.Qt.RightButton:
ev.accept()
dif = ev.screenPos() - ev.lastScreenPos()
dif = np.array([dif.x(), dif.y()])
dif[0] *= -1
s = 1.02**dif
current_view = self.viewRect()
#if only one node visible and wants to zoom in - not allowed
if not (self.is_1_or_less(current_view) and s[1] < 1):
#if all visible and wants to zoom out - not allowed
if self.is_all_visible(
current_range=self.viewRange()) and s > 1:
pass
else:
# center is calculated in graph coords
tr = self.childGroup.transform()
tr = fn.invertQTransform(tr)
center = pg.QtCore.QPointF(
tr.map(ev.buttonDownPos(QtCore.Qt.RightButton)))
if self.canopy_pespective: #changing center to ensure fixed canopy
# max y-value of graph aka canopy
max_y_coord = max(self.y_coords)
center = (center.x(), max_y_coord)
self._resetTarget()
if (ev.modifiers() & QtCore.Qt.ShiftModifier):
self.scaleBy(x=s[1], center=center)
elif (ev.modifiers() & QtCore.Qt.ControlModifier):
self.scaleBy(y=s[1], center=center)
else:
#using y displacment for calculate both scales
self.scaleBy(x=s[1], y=s[1], center=center)
def wheelEvent(self, ev, axis=None):
"""Override wheel event so we manually track changes of zoom and
update map accordingly."""
if ev.delta() > 0:
# zoom-in
self.__zoom_level = self.__zoom_in_range(self.__zoom_level + 1)
else:
# zoom-out
self.__zoom_level = self.__zoom_in_range(self.__zoom_level - 1)
center = Point(fn.invertQTransform(self.childGroup.transform()).map(ev.pos()))
self.match_zoom(center, offset=True)
ev.accept()
def wheelEvent(self, ev, axis=None):
mask = np.array(self.state['mouseEnabled'], dtype=np.float)
if axis is not None and axis >= 0 and axis < len(mask):
mv = mask[axis]
mask[:] = 0
mask[axis] = mv
s = ((mask * 0.02) + 1) ** (ev.delta() * self.state['wheelScaleFactor']) # actual scaling factor
center = Point(fn.invertQTransform(self.childGroup.transform()).map(ev.pos()))
#center = ev.pos()
self.scaleBy(s, center)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
ev.accept()
def mouseDragEvent(self, ev, axis=None):
## if axis is specified, event will only affect that axis.
ev.accept() ## we accept all buttons
pos = ev.pos()
lastPos = ev.lastPos()
dif = pos - lastPos
dif = dif * -1
## Ignore axes if mouse is disabled
mask = np.array(self.state['mouseEnabled'], dtype=np.float)
if axis is not None:
mask[1-axis] = 0.0
## Scale or translate based on mouse button
if ev.button() & (QtCore.Qt.LeftButton | QtCore.Qt.MidButton):
if self.state['mouseMode'] == ViewBox.RectMode:
if ev.isFinish(): ## This is the final move in the drag; change the view scale now
#print "finish"
self.rbScaleBox.hide()
#ax = QtCore.QRectF(Point(self.pressPos), Point(self.mousePos))
ax = QtCore.QRectF(Point(ev.buttonDownPos(ev.button())), Point(pos))
ax = self.childGroup.mapRectFromParent(ax)
self.showAxRect(ax)
self.axHistoryPointer += 1
self.axHistory = self.axHistory[:self.axHistoryPointer] + [ax]
else:
## update shape of scale box
self.updateScaleBox(ev.buttonDownPos(), ev.pos())
else:
tr = dif*mask
tr = self.mapToView(tr) - self.mapToView(Point(0,0))
self.translateBy(tr)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
elif ev.button() & QtCore.Qt.RightButton:
#print "vb.rightDrag"
if self.state['aspectLocked'] is not False:
mask[0] = 0
dif = ev.screenPos() - ev.lastScreenPos()
dif = np.array([dif.x(), dif.y()])
dif[0] *= -1
s = ((mask * 0.02) + 1) ** dif
tr = self.childGroup.transform()
tr = fn.invertQTransform(tr)
center = Point(tr.map(ev.buttonDownPos(QtCore.Qt.RightButton)))
self.scaleBy(s, center)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
def mouseDragEvent(self, ev, axis = None):
"""If axis is specified, event will only affect that axis."""
ev.accept() ## we accept all buttons
## Ignore axes if mouse is disabled
mouseEnabled = np.array(self.state['mouseEnabled'], dtype=np.float)
mask = mouseEnabled.copy()
if axis is not None:
mask[1-axis] = 0.0
## Scale or translate based on mouse button
if ev.button() & QtCore.Qt.RightButton:
dif = ev.screenPos() - ev.lastScreenPos()
tr = self.childGroup.transform()
tr = fn.invertQTransform(tr)
self.scaleBy(x = None, y = ((mask[1] * 0.02) + 1) ** dif.y(), center=(0, 0)) #here mu change
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
def generateShape(self):
## determine rotation of transform
#m = self.sceneTransform() ## Qt bug: do not access sceneTransform() until we know this object has a scene.
#mi = m.inverted()[0]
dt = self.deviceTransform()
if dt is None:
self._shape = self.path
return None
v = dt.map(QtCore.QPointF(1, 0)) - dt.map(QtCore.QPointF(0, 0))
va = np.arctan2(v.y(), v.x())
dti = fn.invertQTransform(dt)
devPos = dt.map(QtCore.QPointF(0, 0))
tr = QtGui.QTransform()
tr.translate(devPos.x(), devPos.y())
tr.rotate(va * 180. / 3.1415926)
return dti.map(tr.map(self.path))
def generatePicture(self):
self.picture = QtGui.QPicture()
p = QtGui.QPainter()
p.begin(self.picture)
dt = fn.invertQTransform(self.viewTransform())
vr = self.getViewWidget().rect()
unit = self.pixelWidth(), self.pixelHeight()
dim = [vr.width(), vr.height()]
lvr = self.boundingRect()
ul = np.array([lvr.left(), lvr.top()])
br = np.array([lvr.right(), lvr.bottom()])
texts = []
if ul[1] > br[1]:
x = ul[1]
ul[1] = br[1]
br[1] = x
for i in [2, 1, 0]: ## Draw three different scales of grid
dist = br - ul
nlTarget = 10.0 ** i
d = 10.0 ** np.floor(np.log10(abs(dist / nlTarget)) + 0.5)
ul1 = np.floor(ul / d) * d
br1 = np.ceil(br / d) * d
dist = br1 - ul1
nl = (dist / d) + 0.5
# print "level", i
# print " dim", dim
# print " dist", dist
# print " d", d
# print " nl", nl
for ax in range(0, 2): ## Draw grid for both axes
ppl = dim[ax] / nl[ax]
c = np.clip(3.0 * (ppl - 3), 0.0, 30.0)
linePen = QtGui.QPen(QtGui.QColor(255, 255, 255, c))
textPen = QtGui.QPen(QtGui.QColor(255, 255, 255, c * 2))
# linePen.setCosmetic(True)
# linePen.setWidth(1)
bx = (ax + 1) % 2
for x in range(0, int(nl[ax])):
linePen.setCosmetic(False)
if ax == 0:
linePen.setWidthF(self.pixelWidth())
# print "ax 0 height", self.pixelHeight()
else:
linePen.setWidthF(self.pixelHeight())
# print "ax 1 width", self.pixelWidth()
p.setPen(linePen)
p1 = np.array([0.0, 0.0])
p2 = np.array([0.0, 0.0])
p1[ax] = ul1[ax] + x * d[ax]
p2[ax] = p1[ax]
p1[bx] = ul[bx]
p2[bx] = br[bx]
## don't draw lines that are out of bounds.
if p1[ax] < min(ul[ax], br[ax]) or p1[ax] > max(ul[ax], br[ax]):
continue
p.drawLine(QtCore.QPointF(p1[0], p1[1]), QtCore.QPointF(p2[0], p2[1]))
if i < 2:
p.setPen(textPen)
if ax == 0:
x = p1[0] + unit[0]
y = ul[1] + unit[1] * 8.0
else:
x = ul[0] + unit[0] * 3
y = p1[1] + unit[1]
texts.append((QtCore.QPointF(x, y), "%g" % p1[ax]))
tr = self.deviceTransform()
# tr.scale(1.5, 1.5)
p.setWorldTransform(fn.invertQTransform(tr))
for t in texts:
x = tr.map(t[0]) + Point(0.5, 0.5)
p.drawText(x, t[1])
p.end()
def mouseDragEvent(
self,
ev,
axis: Optional[int] = None,
) -> None:
# if axis is specified, event will only affect that axis.
ev.accept() # we accept all buttons
button = ev.button()
pos = ev.pos()
lastPos = ev.lastPos()
dif = pos - lastPos
dif = dif * -1
# Ignore axes if mouse is disabled
mouseEnabled = np.array(self.state['mouseEnabled'], dtype=np.float)
mask = mouseEnabled.copy()
if axis is not None:
mask[1 - axis] = 0.0
# Scale or translate based on mouse button
if button & (QtCore.Qt.LeftButton | QtCore.Qt.MidButton):
# zoom y-axis ONLY when click-n-drag on it
if axis == 1:
# set a static y range special value on chart widget to
# prevent sizing to data in view.
self.chart._static_yrange = 'axis'
scale_y = 1.3**(dif.y() * -1 / 20)
self.setLimits(yMin=None, yMax=None)
# print(scale_y)
self.scaleBy((0, scale_y))
if self.state['mouseMode'] == ViewBox.RectMode:
down_pos = ev.buttonDownPos()
# This is the final position in the drag
if ev.isFinish():
self.select_box.mouse_drag_released(down_pos, pos)
# ax = QtCore.QRectF(down_pos, pos)
# ax = self.childGroup.mapRectFromParent(ax)
# print(ax)
# this is the zoom transform cmd
# self.showAxRect(ax)
# self.axHistoryPointer += 1
# self.axHistory = self.axHistory[
# :self.axHistoryPointer] + [ax]
else:
self.select_box.set_pos(down_pos, pos)
# update shape of scale box
# self.updateScaleBox(ev.buttonDownPos(), ev.pos())
else:
# default bevavior: click to pan view
tr = self.childGroup.transform()
tr = fn.invertQTransform(tr)
tr = tr.map(dif * mask) - tr.map(Point(0, 0))
x = tr.x() if mask[0] == 1 else None
y = tr.y() if mask[1] == 1 else None
self._resetTarget()
if x is not None or y is not None:
self.translateBy(x=x, y=y)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
elif button & QtCore.Qt.RightButton:
# right click zoom to center behaviour
if self.state['aspectLocked'] is not False:
mask[0] = 0
dif = ev.screenPos() - ev.lastScreenPos()
dif = np.array([dif.x(), dif.y()])
dif[0] *= -1
s = ((mask * 0.02) + 1)**dif
tr = self.childGroup.transform()
tr = fn.invertQTransform(tr)
x = s[0] if mouseEnabled[0] == 1 else None
y = s[1] if mouseEnabled[1] == 1 else None
center = Point(tr.map(ev.buttonDownPos(QtCore.Qt.RightButton)))
self._resetTarget()
self.scaleBy(x=x, y=y, center=center)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
def generatePicture(self):
self.picture = QtGui.QPicture()
p = QtGui.QPainter()
p.begin(self.picture)
dt = fn.invertQTransform(self.viewTransform())
vr = self.getViewWidget().rect()
unit = self.pixelWidth(), self.pixelHeight()
dim = [vr.width(), vr.height()]
lvr = self.boundingRect()
ul = np.array([lvr.left(), lvr.top()])
br = np.array([lvr.right(), lvr.bottom()])
texts = []
if ul[1] > br[1]:
x = ul[1]
ul[1] = br[1]
br[1] = x
for i in [2,1,0]: ## Draw three different scales of grid
dist = br-ul
nlTarget = 10.**i
d = 10. ** np.floor(np.log10(abs(dist/nlTarget))+0.5)
ul1 = np.floor(ul / d) * d
br1 = np.ceil(br / d) * d
dist = br1-ul1
nl = (dist / d) + 0.5
#print "level", i
#print " dim", dim
#print " dist", dist
#print " d", d
#print " nl", nl
for ax in range(0,2): ## Draw grid for both axes
ppl = dim[ax] / nl[ax]
c = np.clip(3.*(ppl-3), 0., 30.)
linePen = QtGui.QPen(QtGui.QColor(255, 255, 255, c))
textPen = QtGui.QPen(QtGui.QColor(255, 255, 255, c*2))
#linePen.setCosmetic(True)
#linePen.setWidth(1)
bx = (ax+1) % 2
for x in range(0, int(nl[ax])):
linePen.setCosmetic(False)
if ax == 0:
linePen.setWidthF(self.pixelWidth())
#print "ax 0 height", self.pixelHeight()
else:
linePen.setWidthF(self.pixelHeight())
#print "ax 1 width", self.pixelWidth()
p.setPen(linePen)
p1 = np.array([0.,0.])
p2 = np.array([0.,0.])
p1[ax] = ul1[ax] + x * d[ax]
p2[ax] = p1[ax]
p1[bx] = ul[bx]
p2[bx] = br[bx]
## don't draw lines that are out of bounds.
if p1[ax] < min(ul[ax], br[ax]) or p1[ax] > max(ul[ax], br[ax]):
continue
p.drawLine(QtCore.QPointF(p1[0], p1[1]), QtCore.QPointF(p2[0], p2[1]))
if i < 2:
p.setPen(textPen)
if ax == 0:
x = p1[0] + unit[0]
y = ul[1] + unit[1] * 8.
else:
x = ul[0] + unit[0]*3
y = p1[1] + unit[1]
texts.append((QtCore.QPointF(x, y), "%g"%p1[ax]))
tr = self.deviceTransform()
#tr.scale(1.5, 1.5)
p.setWorldTransform(fn.invertQTransform(tr))
for t in texts:
x = tr.map(t[0]) + Point(0.5, 0.5)
p.drawText(x, t[1])
p.end()
def onMouseWheeled(self, ev, axis):
"""
Allows mouse wheel zoom on ctrl-click [currently]
"""
self.controlDrag = False # TODO: hack that should not be needed
modifiers = QtGui.QApplication.keyboardModifiers()
if modifiers == QtCore.Qt.ControlModifier or (modifiers == (
QtCore.Qt.ControlModifier | QtCore.Qt.ShiftModifier)):
# Emit a signal when the wheel is rotated alone and return a positive or negative value in self.progressBy
# that we can use to incremement the image layer in the current axes
if ev.delta() > 0:
self.progressBy = 1
elif ev.delta() < 0:
self.progressBy = -1
else:
self.progressBy = 0
# this may be mouse-specific!
self.progressBy = (self.progressBy * abs(ev.delta()) / 120)
if modifiers == (QtCore.Qt.ControlModifier
| QtCore.Qt.ShiftModifier):
# Allow faster scrolling if it was a shift+wheel
self.progressBy = self.progressBy * 5
self.progressLayer.emit()
else:
# Handle zoom (mousewheel with no keyboard modifier)
mask = np.array(self.state["mouseEnabled"], dtype=np.float)
if axis is not None and 0 <= axis < len(mask):
mv = mask[axis]
mask[:] = 0
mask[axis] = mv
# actual scaling factor
s = ((mask * 0.02) + 1)**(ev.delta() *
self.state["wheelScaleFactor"])
center = pg.Point(
fn.invertQTransform(self.childGroup.transform()).map(ev.pos()))
# center = ev.pos()
self._resetTarget()
self.scaleBy(s, center)
self.sigRangeChangedManually.emit(self.state["mouseEnabled"])
ev.accept()
if len(self.linkedAxis) > 0:
for thisViewBox in self.linkedAxis:
if self.linkedAxis[thisViewBox]["linkZoom"]:
# Centre with the appropriate axes to avoid the views translating in horrible ways during zooming
# I don't know why I also need to call my centerOn() method, but at least this works
if (self.linkedAxis[thisViewBox]["linkX"] == "x" and
self.linkedAxis[thisViewBox]["linkY"] is None):
thisViewBox.scaleBy(s, x=center.x())
self.centreOn(thisViewBox, x=center.x())
if (self.linkedAxis[thisViewBox]["linkY"] == "y" and
self.linkedAxis[thisViewBox]["linkX"] is None):
thisViewBox.scaleBy(s, y=center.y())
self.centreOn(thisViewBox, y=center.y())
if (self.linkedAxis[thisViewBox]["linkX"] == "y" and
self.linkedAxis[thisViewBox]["linkY"] is None):
thisViewBox.scaleBy(s, y=center.x())
self.centreOn(thisViewBox, y=center.x())
if (self.linkedAxis[thisViewBox]["linkY"] == "x" and
self.linkedAxis[thisViewBox]["linkX"] is None):
thisViewBox.scaleBy(s, x=center.y())
self.centreOn(thisViewBox, x=center.y())
# The following two cases aren't used currently by Lasagna, but may be required in the future.
# They haven't been tested yet. [28/07/15]
if (self.linkedAxis[thisViewBox]["linkY"] == "x" and
self.linkedAxis[thisViewBox]["linkX"] == "y"):
thisViewBox.scaleBy(s, x=center.y(), y=center.x())
self.centreOn(thisViewBox,
x=center.y(),
y=center.x())
if (self.linkedAxis[thisViewBox]["linkY"] == "y" and
self.linkedAxis[thisViewBox]["linkX"] == "x"):
thisViewBox.scaleBy(s, x=center.x(), y=center.y())
self.centreOn(thisViewBox,
x=center.x(),
y=center.y())
def mapRectFromView(self, obj):
vt = self.viewTransform()
if vt is None:
return None
vt = fn.invertQTransform(vt)
return vt.mapRect(obj)
def mapToView(self, obj):
"""Maps from the local coordinates of the ViewBox to the coordinate system displayed inside the ViewBox"""
m = fn.invertQTransform(self.childTransform())
return m.map(obj)
def pixelVectors(self, direction=None):
"""Return vectors in local coordinates representing the width and height of a view pixel.
If direction is specified, then return vectors parallel and orthogonal to it.
Return (None, None) if pixel size is not yet defined (usually because the item has not yet been displayed)
or if pixel size is below floating-point precision limit.
"""
## This is an expensive function that gets called very frequently.
## We have two levels of cache to try speeding things up.
dt = self.deviceTransform()
if dt is None:
return None, None
## check local cache
if direction is None and dt == self._pixelVectorCache[0]:
return self._pixelVectorCache[1]
## check global cache
key = (dt.m11(), dt.m21(), dt.m31(), dt.m12(), dt.m22(), dt.m32(), dt.m31(), dt.m32())
pv = self._pixelVectorGlobalCache.get(key, None)
if pv is not None:
self._pixelVectorCache = [dt, pv]
return pv
if direction is None:
direction = QtCore.QPointF(1, 0)
if direction.manhattanLength() == 0:
raise Exception("Cannot compute pixel length for 0-length vector.")
## attempt to re-scale direction vector to fit within the precision of the coordinate system
if direction.x() == 0:
r = abs(dt.m32())/(abs(dt.m12()) + abs(dt.m22()))
#r = 1.0/(abs(dt.m12()) + abs(dt.m22()))
elif direction.y() == 0:
r = abs(dt.m31())/(abs(dt.m11()) + abs(dt.m21()))
#r = 1.0/(abs(dt.m11()) + abs(dt.m21()))
else:
r = ((abs(dt.m32())/(abs(dt.m12()) + abs(dt.m22()))) * (abs(dt.m31())/(abs(dt.m11()) + abs(dt.m21()))))**0.5
directionr = direction * r
## map direction vector onto device
#viewDir = Point(dt.map(directionr) - dt.map(Point(0,0)))
#mdirection = dt.map(directionr)
dirLine = QtCore.QLineF(QtCore.QPointF(0,0), directionr)
viewDir = dt.map(dirLine)
if viewDir.length() == 0:
return None, None ## pixel size cannot be represented on this scale
## get unit vector and orthogonal vector (length of pixel)
#orthoDir = Point(viewDir[1], -viewDir[0]) ## orthogonal to line in pixel-space
try:
normView = viewDir.unitVector()
#normView = viewDir.norm() ## direction of one pixel orthogonal to line
normOrtho = normView.normalVector()
#normOrtho = orthoDir.norm()
except:
raise Exception("Invalid direction %s" %directionr)
## map back to item
dti = fn.invertQTransform(dt)
#pv = Point(dti.map(normView)-dti.map(Point(0,0))), Point(dti.map(normOrtho)-dti.map(Point(0,0)))
pv = Point(dti.map(normView).p2()), Point(dti.map(normOrtho).p2())
self._pixelVectorCache[1] = pv
self._pixelVectorCache[0] = dt
self._pixelVectorGlobalCache[key] = pv
return self._pixelVectorCache[1]
def mouseDragEvent(
self,
ev,
axis: Optional[int] = None,
relayed_from: ChartView = None,
) -> None:
pos = ev.pos()
lastPos = ev.lastPos()
dif = pos - lastPos
dif = dif * -1
# NOTE: if axis is specified, event will only affect that axis.
button = ev.button()
# Ignore axes if mouse is disabled
mouseEnabled = np.array(self.state['mouseEnabled'], dtype=np.float)
mask = mouseEnabled.copy()
if axis is not None:
mask[1-axis] = 0.0
# Scale or translate based on mouse button
if button & (
QtCore.Qt.LeftButton | QtCore.Qt.MidButton
):
# zoom y-axis ONLY when click-n-drag on it
# if axis == 1:
# # set a static y range special value on chart widget to
# # prevent sizing to data in view.
# self.chart._static_yrange = 'axis'
# scale_y = 1.3 ** (dif.y() * -1 / 20)
# self.setLimits(yMin=None, yMax=None)
# # print(scale_y)
# self.scaleBy((0, scale_y))
# SELECTION MODE
if (
self.state['mouseMode'] == ViewBox.RectMode
and axis is None
):
# XXX: WHY
ev.accept()
down_pos = ev.buttonDownPos()
# This is the final position in the drag
if ev.isFinish():
self.select_box.mouse_drag_released(down_pos, pos)
ax = QtCore.QRectF(down_pos, pos)
ax = self.childGroup.mapRectFromParent(ax)
# this is the zoom transform cmd
self.showAxRect(ax)
# axis history tracking
self.axHistoryPointer += 1
self.axHistory = self.axHistory[
:self.axHistoryPointer] + [ax]
else:
print('drag finish?')
self.select_box.set_pos(down_pos, pos)
# update shape of scale box
# self.updateScaleBox(ev.buttonDownPos(), ev.pos())
self.updateScaleBox(
down_pos,
ev.pos(),
)
# PANNING MODE
else:
# XXX: WHY
ev.accept()
self.start_ic()
# if self._ic is None:
# self.chart.pause_all_feeds()
# self._ic = trio.Event()
if axis == 1:
self.chart._static_yrange = 'axis'
tr = self.childGroup.transform()
tr = fn.invertQTransform(tr)
tr = tr.map(dif*mask) - tr.map(Point(0, 0))
x = tr.x() if mask[0] == 1 else None
y = tr.y() if mask[1] == 1 else None
self._resetTarget()
if x is not None or y is not None:
self.translateBy(x=x, y=y)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
if ev.isFinish():
self.signal_ic()
# self._ic.set()
# self._ic = None
# self.chart.resume_all_feeds()
# WEIRD "RIGHT-CLICK CENTER ZOOM" MODE
elif button & QtCore.Qt.RightButton:
if self.state['aspectLocked'] is not False:
mask[0] = 0
dif = ev.screenPos() - ev.lastScreenPos()
dif = np.array([dif.x(), dif.y()])
dif[0] *= -1
s = ((mask * 0.02) + 1) ** dif
tr = self.childGroup.transform()
tr = fn.invertQTransform(tr)
x = s[0] if mouseEnabled[0] == 1 else None
y = s[1] if mouseEnabled[1] == 1 else None
center = Point(tr.map(ev.buttonDownPos(QtCore.Qt.RightButton)))
self._resetTarget()
self.scaleBy(x=x, y=y, center=center)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
# XXX: WHY
ev.accept()
def pixelVectors(self, direction=None):
"""Return vectors in local coordinates representing the width and height of a view pixel.
If direction is specified, then return vectors parallel and orthogonal to it.
Return (None, None) if pixel size is not yet defined (usually because the item has not yet been displayed)
or if pixel size is below floating-point precision limit.
"""
## This is an expensive function that gets called very frequently.
## We have two levels of cache to try speeding things up.
dt = self.deviceTransform()
if dt is None:
return None, None
## Ignore translation. If the translation is much larger than the scale
## (such as when looking at unix timestamps), we can get floating-point errors.
dt.setMatrix(dt.m11(), dt.m12(), 0, dt.m21(), dt.m22(), 0, 0, 0, 1)
## check local cache
if direction is None and dt == self._pixelVectorCache[0]:
return tuple(map(Point, self._pixelVectorCache[1])) ## return a *copy*
## check global cache
#key = (dt.m11(), dt.m21(), dt.m31(), dt.m12(), dt.m22(), dt.m32(), dt.m31(), dt.m32())
key = (dt.m11(), dt.m21(), dt.m12(), dt.m22())
pv = self._pixelVectorGlobalCache.get(key, None)
if direction is None and pv is not None:
self._pixelVectorCache = [dt, pv]
return tuple(map(Point,pv)) ## return a *copy*
if direction is None:
direction = QtCore.QPointF(1, 0)
if direction.manhattanLength() == 0:
raise Exception("Cannot compute pixel length for 0-length vector.")
## attempt to re-scale direction vector to fit within the precision of the coordinate system
## Here's the problem: we need to map the vector 'direction' from the item to the device, via transform 'dt'.
## In some extreme cases, this mapping can fail unless the length of 'direction' is cleverly chosen.
## Example:
## dt = [ 1, 0, 2
## 0, 2, 1e20
## 0, 0, 1 ]
## Then we map the origin (0,0) and direction (0,1) and get:
## o' = 2,1e20
## d' = 2,1e20 <-- should be 1e20+2, but this can't be represented with a 32-bit float
##
## |o' - d'| == 0 <-- this is the problem.
## Perhaps the easiest solution is to exclude the transformation column from dt. Does this cause any other problems?
#if direction.x() == 0:
#r = abs(dt.m32())/(abs(dt.m12()) + abs(dt.m22()))
##r = 1.0/(abs(dt.m12()) + abs(dt.m22()))
#elif direction.y() == 0:
#r = abs(dt.m31())/(abs(dt.m11()) + abs(dt.m21()))
##r = 1.0/(abs(dt.m11()) + abs(dt.m21()))
#else:
#r = ((abs(dt.m32())/(abs(dt.m12()) + abs(dt.m22()))) * (abs(dt.m31())/(abs(dt.m11()) + abs(dt.m21()))))**0.5
#if r == 0:
#r = 1. ## shouldn't need to do this; probably means the math above is wrong?
#directionr = direction * r
directionr = direction
## map direction vector onto device
#viewDir = Point(dt.map(directionr) - dt.map(Point(0,0)))
#mdirection = dt.map(directionr)
dirLine = QtCore.QLineF(QtCore.QPointF(0,0), directionr)
viewDir = dt.map(dirLine)
if viewDir.length() == 0:
return None, None ## pixel size cannot be represented on this scale
## get unit vector and orthogonal vector (length of pixel)
#orthoDir = Point(viewDir[1], -viewDir[0]) ## orthogonal to line in pixel-space
try:
normView = viewDir.unitVector()
#normView = viewDir.norm() ## direction of one pixel orthogonal to line
normOrtho = normView.normalVector()
#normOrtho = orthoDir.norm()
except:
raise Exception("Invalid direction %s" %directionr)
## map back to item
dti = fn.invertQTransform(dt)
#pv = Point(dti.map(normView)-dti.map(Point(0,0))), Point(dti.map(normOrtho)-dti.map(Point(0,0)))
pv = Point(dti.map(normView).p2()), Point(dti.map(normOrtho).p2())
self._pixelVectorCache[1] = pv
self._pixelVectorCache[0] = dt
self._pixelVectorGlobalCache[key] = pv
return self._pixelVectorCache[1]
def mapRectFromView(self, obj):
vt = self.viewTransform()
if vt is None:
return None
vt = fn.invertQTransform(vt)
return vt.mapRect(obj)
def pixelVectors(self, direction=None):
"""Return vectors in local coordinates representing the width and height of a view pixel.
If direction is specified, then return vectors parallel and orthogonal to it.
Return (None, None) if pixel size is not yet defined (usually because the item has not yet been displayed)
or if pixel size is below floating-point precision limit.
"""
## This is an expensive function that gets called very frequently.
## We have two levels of cache to try speeding things up.
dt = self.deviceTransform()
if dt is None:
return None, None
## Ignore translation. If the translation is much larger than the scale
## (such as when looking at unix timestamps), we can get floating-point errors.
dt.setMatrix(dt.m11(), dt.m12(), 0, dt.m21(), dt.m22(), 0, 0, 0, 1)
## check local cache
if direction is None and dt == self._pixelVectorCache[0]:
return tuple(map(Point,
self._pixelVectorCache[1])) ## return a *copy*
## check global cache
#key = (dt.m11(), dt.m21(), dt.m31(), dt.m12(), dt.m22(), dt.m32(), dt.m31(), dt.m32())
key = (dt.m11(), dt.m21(), dt.m12(), dt.m22())
pv = self._pixelVectorGlobalCache.get(key, None)
if direction is None and pv is not None:
self._pixelVectorCache = [dt, pv]
return tuple(map(Point, pv)) ## return a *copy*
if direction is None:
direction = QtCore.QPointF(1, 0)
if direction.manhattanLength() == 0:
raise Exception("Cannot compute pixel length for 0-length vector.")
## attempt to re-scale direction vector to fit within the precision of the coordinate system
## Here's the problem: we need to map the vector 'direction' from the item to the device, via transform 'dt'.
## In some extreme cases, this mapping can fail unless the length of 'direction' is cleverly chosen.
## Example:
## dt = [ 1, 0, 2
## 0, 2, 1e20
## 0, 0, 1 ]
## Then we map the origin (0,0) and direction (0,1) and get:
## o' = 2,1e20
## d' = 2,1e20 <-- should be 1e20+2, but this can't be represented with a 32-bit float
##
## |o' - d'| == 0 <-- this is the problem.
## Perhaps the easiest solution is to exclude the transformation column from dt. Does this cause any other problems?
#if direction.x() == 0:
#r = abs(dt.m32())/(abs(dt.m12()) + abs(dt.m22()))
##r = 1.0/(abs(dt.m12()) + abs(dt.m22()))
#elif direction.y() == 0:
#r = abs(dt.m31())/(abs(dt.m11()) + abs(dt.m21()))
##r = 1.0/(abs(dt.m11()) + abs(dt.m21()))
#else:
#r = ((abs(dt.m32())/(abs(dt.m12()) + abs(dt.m22()))) * (abs(dt.m31())/(abs(dt.m11()) + abs(dt.m21()))))**0.5
#if r == 0:
#r = 1. ## shouldn't need to do this; probably means the math above is wrong?
#directionr = direction * r
directionr = direction
## map direction vector onto device
#viewDir = Point(dt.map(directionr) - dt.map(Point(0,0)))
#mdirection = dt.map(directionr)
dirLine = QtCore.QLineF(QtCore.QPointF(0, 0), directionr)
viewDir = dt.map(dirLine)
if viewDir.length() == 0:
return None, None ## pixel size cannot be represented on this scale
## get unit vector and orthogonal vector (length of pixel)
#orthoDir = Point(viewDir[1], -viewDir[0]) ## orthogonal to line in pixel-space
try:
normView = viewDir.unitVector()
#normView = viewDir.norm() ## direction of one pixel orthogonal to line
normOrtho = normView.normalVector()
#normOrtho = orthoDir.norm()
except:
raise Exception("Invalid direction %s" % directionr)
## map back to item
dti = fn.invertQTransform(dt)
#pv = Point(dti.map(normView)-dti.map(Point(0,0))), Point(dti.map(normOrtho)-dti.map(Point(0,0)))
pv = Point(dti.map(normView).p2()), Point(dti.map(normOrtho).p2())
self._pixelVectorCache[1] = pv
self._pixelVectorCache[0] = dt
self._pixelVectorGlobalCache[key] = pv
return self._pixelVectorCache[1]
def wheelEvent(
self,
ev,
axis=None,
relayed_from: ChartView = None,
):
'''
Override "center-point" location for scrolling.
This is an override of the ``ViewBox`` method simply changing
the center of the zoom to be the y-axis.
TODO: PR a method into ``pyqtgraph`` to make this configurable
'''
if axis in (0, 1):
mask = [False, False]
mask[axis] = self.state['mouseEnabled'][axis]
else:
mask = self.state['mouseEnabled'][:]
chart = self.linkedsplits.chart
# don't zoom more then the min points setting
l, lbar, rbar, r = chart.bars_range()
vl = r - l
if ev.delta() > 0 and vl <= _min_points_to_show:
log.debug("Max zoom bruh...")
return
if ev.delta() < 0 and vl >= len(chart._arrays[chart.name]) + 666:
log.debug("Min zoom bruh...")
return
# actual scaling factor
s = 1.015 ** (ev.delta() * -1 / 20) # self.state['wheelScaleFactor'])
s = [(None if m is False else s) for m in mask]
if (
# zoom happened on axis
axis == 1
# if already in axis zoom mode then keep it
or self.chart._static_yrange == 'axis'
):
self.chart._static_yrange = 'axis'
self.setLimits(yMin=None, yMax=None)
# print(scale_y)
# pos = ev.pos()
# lastPos = ev.lastPos()
# dif = pos - lastPos
# dif = dif * -1
center = Point(
fn.invertQTransform(
self.childGroup.transform()
).map(ev.pos())
)
# scale_y = 1.3 ** (center.y() * -1 / 20)
self.scaleBy(s, center)
else:
# center = pg.Point(
# fn.invertQTransform(self.childGroup.transform()).map(ev.pos())
# )
# XXX: scroll "around" the right most element in the view
# which stays "pinned" in place.
# furthest_right_coord = self.boundingRect().topRight()
# yaxis = pg.Point(
# fn.invertQTransform(
# self.childGroup.transform()
# ).map(furthest_right_coord)
# )
# This seems like the most "intuitive option, a hybrid of
# tws and tv styles
last_bar = pg.Point(int(rbar)) + 1
ryaxis = chart.getAxis('right')
r_axis_x = ryaxis.pos().x()
end_of_l1 = pg.Point(
round(
chart.cv.mapToView(
pg.Point(r_axis_x - chart._max_l1_line_len)
# QPointF(chart._max_l1_line_len, 0)
).x()
)
) # .x()
# self.state['viewRange'][0][1] = end_of_l1
# focal = pg.Point((last_bar.x() + end_of_l1)/2)
focal = min(
last_bar,
end_of_l1,
key=lambda p: p.x()
)
# focal = pg.Point(last_bar.x() + end_of_l1)
self._resetTarget()
self.scaleBy(s, focal)
self.sigRangeChangedManually.emit(mask)
# self._ic.set()
# self._ic = None
# self.chart.resume_all_feeds()
ev.accept()
def mouseDragEvent(self, ev, axis=None):
# if axis is specified, event will only affect that axis.
ev.accept() # we accept all buttons
pos = ev.pos()
lastPos = ev.lastPos()
dif = pos - lastPos
dif = dif * -1
# Ignore axes if mouse is disabled
mouseEnabled = np.array(self.state['mouseEnabled'], dtype=np.float)
mask = mouseEnabled.copy()
if axis is not None:
mask[1 - axis] = 0.0
# Scale or translate based on mouse button
if ev.button() & (QtCore.Qt.LeftButton | QtCore.Qt.MidButton):
if self.state['mouseMode'] == ViewBox.RectMode:
down_pos = ev.buttonDownPos()
# This is the final position in the drag
if ev.isFinish():
self.select_box.mouse_drag_released(down_pos, pos)
# ax = QtCore.QRectF(down_pos, pos)
# ax = self.childGroup.mapRectFromParent(ax)
# print(ax)
# this is the zoom transform cmd
# self.showAxRect(ax)
# self.axHistoryPointer += 1
# self.axHistory = self.axHistory[
# :self.axHistoryPointer] + [ax]
else:
self.select_box.set_pos(down_pos, pos)
# update shape of scale box
# self.updateScaleBox(ev.buttonDownPos(), ev.pos())
else:
tr = self.childGroup.transform()
tr = fn.invertQTransform(tr)
tr = tr.map(dif * mask) - tr.map(Point(0, 0))
x = tr.x() if mask[0] == 1 else None
y = tr.y() if mask[1] == 1 else None
self._resetTarget()
if x is not None or y is not None:
self.translateBy(x=x, y=y)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
elif ev.button() & QtCore.Qt.RightButton:
# print "vb.rightDrag"
if self.state['aspectLocked'] is not False:
mask[0] = 0
dif = ev.screenPos() - ev.lastScreenPos()
dif = np.array([dif.x(), dif.y()])
dif[0] *= -1
s = ((mask * 0.02) + 1)**dif
tr = self.childGroup.transform()
tr = fn.invertQTransform(tr)
x = s[0] if mouseEnabled[0] == 1 else None
y = s[1] if mouseEnabled[1] == 1 else None
center = Point(tr.map(ev.buttonDownPos(QtCore.Qt.RightButton)))
self._resetTarget()
self.scaleBy(x=x, y=y, center=center)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
def mouseDragEvent(self, ev, axis=None):
"""Mouse drag tracker
This function keep track of the mouse position and overwrites it to take the draw mode into account.
Args:
ev: signal emitted when user releases a mouse button.
"""
# Overwritting mouseDragEvent to take drawmode into account.
ev.accept()
pos = ev.pos()
lastPos = ev.lastPos()
dif = pos - lastPos
dif = dif * -1
# Ignore axes if mouse is disabled
mouseEnabled = np.array(self.state['mouseEnabled'], dtype=np.float)
mask = mouseEnabled.copy()
if axis is not None:
mask[1 - axis] = 0.0
# If in drawing mode (editted part):
if self.drawing:
self.state['mouseMode'] = self.RectMode
# If right button is selected draw zoom in boxes:
if ev.button() & QtCore.Qt.RightButton:
if ev.isFinish():
self.rbScaleBox.hide()
ax = QtCore.QRectF(
Point(ev.buttonDownPos(ev.button())), Point(pos))
ax = self.childGroup.mapRectFromParent(ax)
self.showAxRect(ax)
self.axHistoryPointer += 1
self.axHistory = self.axHistory[:self.axHistoryPointer] + [ax]
else:
self.updateScaleBox(ev.buttonDownPos(), ev.pos())
# If Left Button is selected drag image (This will be overwritten in the image by the drawing kernel)
elif ev.button() & QtCore.Qt.LeftButton:
tr = dif * mask
tr = self.mapToView(tr) - self.mapToView(Point(0, 0))
x = tr.x() if mask[0] == 1 else None
y = tr.y() if mask[1] == 1 else None
self._resetTarget()
if x is not None or y is not None:
self.translateBy(x=x, y=y)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
# If Middle Button (wheel) zoom in or out.
elif ev.button() & QtCore.Qt.MidButton:
if self.state['aspectLocked'] is not False:
mask[0] = 0
dif = ev.screenPos() - ev.lastScreenPos()
dif = np.array([dif.x(), dif.y()])
dif[0] *= -1
s = ((mask * 0.02) + 1) ** dif
tr = self.childGroup.transform()
tr = fn.invertQTransform(tr)
x = s[0] if mouseEnabled[0] == 1 else None
y = s[1] if mouseEnabled[1] == 1 else None
center = Point(tr.map(ev.buttonDownPos(QtCore.Qt.LeftButton)))
self._resetTarget()
self.scaleBy(x=x, y=y, center=center)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
# If not in drawing mode: (original functionality)
else:
# Scale or translate based on mouse button
if ev.button() & (QtCore.Qt.LeftButton | QtCore.Qt.MidButton):
if self.state['mouseMode'] == ViewBox.RectMode:
if ev.isFinish(): # This is the final move in the drag; change the view scale now
# print "finish"
self.rbScaleBox.hide()
ax = QtCore.QRectF(
Point(ev.buttonDownPos(ev.button())), Point(pos))
ax = self.childGroup.mapRectFromParent(ax)
self.showAxRect(ax)
self.axHistoryPointer += 1
self.axHistory = self.axHistory[:self.axHistoryPointer] + [
ax]
else:
# update shape of scale box
self.updateScaleBox(ev.buttonDownPos(), ev.pos())
else:
tr = dif * mask
tr = self.mapToView(tr) - self.mapToView(Point(0, 0))
x = tr.x() if mask[0] == 1 else None
y = tr.y() if mask[1] == 1 else None
self._resetTarget()
if x is not None or y is not None:
self.translateBy(x=x, y=y)
self.sigRangeChangedManually.emit(
self.state['mouseEnabled'])
elif ev.button() & QtCore.Qt.RightButton:
# print "vb.rightDrag"
if self.state['aspectLocked'] is not False:
mask[0] = 0
dif = ev.screenPos() - ev.lastScreenPos()
dif = np.array([dif.x(), dif.y()])
dif[0] *= -1
s = ((mask * 0.02) + 1) ** dif
tr = self.childGroup.transform()
tr = fn.invertQTransform(tr)
x = s[0] if mouseEnabled[0] == 1 else None
y = s[1] if mouseEnabled[1] == 1 else None
center = Point(tr.map(ev.buttonDownPos(QtCore.Qt.RightButton)))
self._resetTarget()
self.scaleBy(x=x, y=y, center=center)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
def onMouseWheeled(self, ev, axis):
"""
Allows mouse wheel zoom on ctrl-click [currently]
"""
self.controlDrag=False #TODO: hack that should not be needed
modifiers = QtGui.QApplication.keyboardModifiers()
if modifiers == QtCore.Qt.ControlModifier or (modifiers == (QtCore.Qt.ControlModifier | QtCore.Qt.ShiftModifier)):
# Emit a signal when the wheel is rotated alone and return a positive or negative value in self.progressBy
# that we can use to incremement the image layer in the current axes
if ev.delta()>0:
self.progressBy=1
elif ev.delta()<0:
self.progressBy=-1
else:
self.progressBy=0
self.progressBy = self.progressBy * abs(ev.delta())/120 #this may be mouse-specific!
if modifiers == (QtCore.Qt.ControlModifier | QtCore.Qt.ShiftModifier):
# Allow faster scrolling if it was a shift+wheel
self.progressBy = self.progressBy*5
self.progressLayer.emit()
else:
#Handle zoom (mousewheel with no keyboard modifier)
mask = np.array(self.state['mouseEnabled'], dtype=np.float)
if axis is not None and axis >= 0 and axis < len(mask):
mv = mask[axis]
mask[:] = 0
mask[axis] = mv
s = ((mask * 0.02) + 1) ** (ev.delta() * self.state['wheelScaleFactor']) # actual scaling factor
center = pg.Point(fn.invertQTransform(self.childGroup.transform()).map(ev.pos()))
#center = ev.pos()
self._resetTarget()
self.scaleBy(s, center)
self.sigRangeChangedManually.emit(self.state['mouseEnabled'])
ev.accept()
if len(self.linkedAxis)>0:
for thisViewBox in self.linkedAxis:
if self.linkedAxis[thisViewBox]['linkZoom']==True:
#Centre with the appropriate axes to avoid the views translating in horrible ways during zooming
#I don't know why I also need to call my centerOn() method, but at least this works
if self.linkedAxis[thisViewBox]['linkX']=='x' and self.linkedAxis[thisViewBox]['linkY'] is None :
thisViewBox.scaleBy(s,x=center.x())
self.centreOn(thisViewBox,x=center.x())
if self.linkedAxis[thisViewBox]['linkY']=='y' and self.linkedAxis[thisViewBox]['linkX'] is None :
thisViewBox.scaleBy(s,y=center.y())
self.centreOn(thisViewBox,y=center.y())
if self.linkedAxis[thisViewBox]['linkX']=='y' and self.linkedAxis[thisViewBox]['linkY'] is None :
thisViewBox.scaleBy(s,y=center.x())
self.centreOn(thisViewBox,y=center.x())
if self.linkedAxis[thisViewBox]['linkY']=='x' and self.linkedAxis[thisViewBox]['linkX'] is None :
thisViewBox.scaleBy(s,x=center.y())
self.centreOn(thisViewBox,x=center.y())
#The following two cases aren't used currently by Lasagna, but may be required in the future.
#They haven't been tested yet. [28/07/15]
if self.linkedAxis[thisViewBox]['linkY']=='x' and self.linkedAxis[thisViewBox]['linkX']=='y' :
thisViewBox.scaleBy(s,x=center.y(),y=center.x())
self.centreOn(thisViewBox,x=center.y(),y=center.x())
if self.linkedAxis[thisViewBox]['linkY']=='y' and self.linkedAxis[thisViewBox]['linkX']=='x' :
thisViewBox.scaleBy(s,x=center.x(),y=center.y())
self.centreOn(thisViewBox,x=center.x(),y=center.y())