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Implementing user-defined limits for ViewBox

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This commit is contained in:
Luke Campagnola 2013-12-08 09:38:43 -05:00
parent c25eb76c2e
commit 797a8c0f08
1 changed files with 81 additions and 1 deletions
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82
pyqtgraph/graphicsItems/ViewBox/ViewBox.py
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@ -118,6 +118,15 @@ class ViewBox(GraphicsWidget):
'wheelScaleFactor': -1.0 / 8.0,
'background': None,
# Limits
'limits': {
'xRange': [None, None], # Maximum and minimum visible X values
'yRange': [None, None], # Maximum and minimum visible Y values
'minRange': [None, None], # Minimum allowed range for both axes
'maxRange': [None, None], # Maximum allowed range for both axes
}
}
self._updatingRange = False ## Used to break recursive loops. See updateAutoRange.
self._itemBoundsCache = weakref.WeakKeyDictionary()
@ -571,6 +580,40 @@ class ViewBox(GraphicsWidget):
else:
padding = 0.02
return padding
def setLimits(self, **kwds):
"""
Set limits that constrain the possible view ranges.
=========== ============================================================
Arguments
xRange (min, max) limits for x-axis range
yRange (min, max) limits for y-axis range
minRange (x, y) minimum allowed span
maxRange (x, y) maximum allowed span
xMin Minimum allowed x-axis range
xMax Maximum allowed x-axis range
yMin Minimum allowed y-axis range
yMax Maximum allowed y-axis range
=========== ============================================================
"""
for kwd in ['xRange', 'yRange', 'minRange', 'maxRange']:
if kwd in kwds and self.state['limits'][kwd] != kwds[kwd]:
self.state['limits'][kwd] = kwds[kwd]
update = True
for axis in [0,1]:
for mnmx in [0,1]:
kwd = [['xMin', 'xMax'], ['yMin', 'yMax']][axis][mnmx]
lname = ['xRange', 'yRange'][axis]
if kwd in kwds and self.state['limits'][lname][mnmx] != kwds[kwd]:
self.state['limits'][lname][mnmx] = kwds[kwd]
update = True
if update:
self.updateViewRange()
def scaleBy(self, s=None, center=None, x=None, y=None):
"""
@ -1351,7 +1394,6 @@ class ViewBox(GraphicsWidget):
# then make the entire target range visible
ax = 0 if targetRatio > viewRatio else 1
#### these should affect viewRange, not targetRange!
if ax == 0:
## view range needs to be taller than target
dy = 0.5 * (tr.width() / viewRatio - tr.height())
@ -1364,6 +1406,44 @@ class ViewBox(GraphicsWidget):
if dx != 0:
changed[0] = True
viewRange[0] = [self.state['targetRange'][0][0] - dx, self.state['targetRange'][0][1] + dx]
# check for any requested limits
rng = (self.state['limits']['xRange'], self.state['limits']['yRange'])
minRng = self.state['limits']['minRange']
maxRng = self.state['limits']['maxRange']
for axis in [0, 1]:
# max range cannot be larger than bounds, if they are given
if rng[axis][0] is not None and rng[axis][1] is not None:
maxRng[axis] = min(maxRng[axis], rng[axis][1]-rng[axis][0])
diff = viewRange[axis][1] - viewRange[axis][0]
print axis, diff, maxRng[axis]
if maxRng[axis] is not None and diff > maxRng[axis]:
delta = maxRng[axis] - diff
changed[axis] = True
elif minRng[axis] is not None and diff < minRng[axis]:
delta = minRng[axis] - diff
changed[axis] = True
else:
delta = 0
viewRange[axis][0] -= diff/2.
viewRange[axis][1] += diff/2.
print viewRange
mn, mx = rng[axis]
if mn is not None and viewRange[axis][0] < mn:
delta = mn - viewRange[axis][0]
viewRange[axis][0] += delta
viewRange[axis][1] += delta
elif mx is not None and viewRange[axis][1] > mx:
delta = mx - viewRange[axis][1]
viewRange[axis][0] += delta
viewRange[axis][1] += delta
changed = [(viewRange[i][0] != self.state['viewRange'][i][0]) and (viewRange[i][1] != self.state['viewRange'][i][1]) for i in (0,1)]
self.state['viewRange'] = viewRange