Added functions.transformCoordinates() for mapping numpy arrays of coordinates from QTransform and QMatrix4x4
Minor updates: - fixed SRTTransform3D.matrix() - ViewBox fix: updateAutoRange leaves unused axes completely unchanged - documentation updates
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Luke Campagnola
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27c90c5dd5
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c2f0bebe09
@ -201,11 +201,11 @@ class SRTTransform3D(QtGui.QMatrix4x4):
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def matrix(self, nd=3):
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if nd == 3:
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return np.array(self.copyDataTo())
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return np.array(self.copyDataTo()).reshape(4,4)
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elif nd == 2:
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m = np.array(self.copyDataTo())
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m = np.array(self.copyDataTo()).reshape(4,4)
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m[2] = m[3]
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m[:,2] = n[:,3]
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m[:,2] = m[:,3]
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return m[:3,:3]
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else:
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raise Exception("Argument 'nd' must be 2 or 3")
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70
functions.py
70
functions.py
@ -461,9 +461,75 @@ def affineSlice(data, shape, origin, vectors, axes, order=1, returnCoords=False,
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def transformToArray(tr):
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"""
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Given a QTransform, return a 3x3 numpy array.
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"""
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return np.array([[tr.m11(), tr.m12(), tr.m13()],[tr.m21(), tr.m22(), tr.m23()],[tr.m31(), tr.m32(), tr.m33()]])
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Given a QMatrix4x4, return a 4x4 numpy array.
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Example: map an array of x,y coordinates through a transform::
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## coordinates to map are (1,5), (2,6), (3,7), and (4,8)
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coords = np.array([[1,2,3,4], [5,6,7,8], [1,1,1,1]]) # the extra '1' coordinate is needed for translation to work
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## Make an example transform
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tr = QtGui.QTransform()
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tr.translate(3,4)
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tr.scale(2, 0.1)
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## convert to array
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m = pg.transformToArray()[:2] # ignore the perspective portion of the transformation
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## map coordinates through transform
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mapped = np.dot(m, coords)
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"""
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#return np.array([[tr.m11(), tr.m12(), tr.m13()],[tr.m21(), tr.m22(), tr.m23()],[tr.m31(), tr.m32(), tr.m33()]])
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## The order of elements given by the method names m11..m33 is misleading--
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## It is most common for x,y translation to occupy the positions 1,3 and 2,3 in
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## a transformation matrix. However, with QTransform these values appear at m31 and m32.
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## So the correct interpretation is transposed:
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if isinstance(tr, QtGui.QTransform):
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return np.array([[tr.m11(), tr.m21(), tr.m31()], [tr.m12(), tr.m22(), tr.m32()], [tr.m13(), tr.m23(), tr.m33()]])
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elif isinstance(tr, QtGui.QMatrix4x4):
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return np.array(tr.copyDataTo()).reshape(4,4)
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else:
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raise Exception("Transform argument must be either QTransform or QMatrix4x4.")
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def transformCoordinates(tr, coords):
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"""
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Map a set of 2D or 3D coordinates through a QTransform or QMatrix4x4.
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The shape of coords must be (2,...) or (3,...)
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The mapping will _ignore_ any perspective transformations.
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"""
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nd = coords.shape[0]
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m = transformToArray(tr)
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m = m[:m.shape[0]-1] # remove perspective
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## If coords are 3D and tr is 2D, assume no change for Z axis
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if m.shape == (2,3) and nd == 3:
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m2 = np.zeros((3,4))
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m2[:2, :2] = m[:2,:2]
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m2[:2, 3] = m[:2,2]
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m2[2,2] = 1
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m = m2
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## if coords are 2D and tr is 3D, ignore Z axis
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if m.shape == (3,4) and nd == 2:
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m2 = np.empty((2,3))
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m2[:,:2] = m[:2,:2]
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m2[:,2] = m[:2,3]
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m = m2
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## reshape tr and coords to prepare for multiplication
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m = m.reshape(m.shape + (1,)*(coords.ndim-1))
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coords = coords[np.newaxis, ...]
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# separate scale/rotate and translation
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translate = m[:,-1]
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m = m[:, :-1]
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## map coordinates and return
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mapped = (m*coords).sum(axis=0) ## apply scale/rotate
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mapped += translate
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return mapped
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def solve3DTransform(points1, points2):
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"""
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Find a 3D transformation matrix that maps points1 onto points2
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@ -854,9 +854,18 @@ class ROI(GraphicsObject):
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else:
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kwds['returnCoords'] = True
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result, coords = fn.affineSlice(data, shape=shape, vectors=vectors, origin=origin, axes=axes, **kwds)
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tr = fn.transformToArray(img.transform())[:,:2].reshape((3, 2) + (1,)*(coords.ndim-1))
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coords = coords[np.newaxis, ...]
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mapped = (tr*coords).sum(axis=0)
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#tr = fn.transformToArray(img.transform())[:2] ## remove perspective transform values
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### separate translation from scale/rotate
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#translate = tr[:,2]
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#tr = tr[:,:2]
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#tr = tr.reshape((2,2) + (1,)*(coords.ndim-1))
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#coords = coords[np.newaxis, ...]
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### map coordinates and return
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#mapped = (tr*coords).sum(axis=0) ## apply scale/rotate
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#mapped += translate.reshape((2,1,1))
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mapped = fn.transformCoordinates(img.transform(), coords)
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return result, mapped
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@ -538,6 +538,7 @@ class ViewBox(GraphicsWidget):
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if self.state['autoVisibleOnly'][0] is True:
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order = [1,0]
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args = {}
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for ax in order:
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if self.state['autoRange'][ax] is False:
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continue
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@ -563,6 +564,7 @@ class ViewBox(GraphicsWidget):
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targetRect[0][0] = childRect.left()
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targetRect[0][1] = childRect.right()
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args['xRange'] = targetRect[0]
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else:
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## Make corrections to Y range
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if self.state['autoPan'][1]:
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@ -576,8 +578,11 @@ class ViewBox(GraphicsWidget):
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targetRect[1][0] = childRect.top()
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targetRect[1][1] = childRect.bottom()
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self.setRange(xRange=targetRect[0], yRange=targetRect[1], padding=0, disableAutoRange=False)
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args['yRange'] = targetRect[1]
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args['padding'] = 0
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args['disableAutoRange'] = False
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#self.setRange(xRange=targetRect[0], yRange=targetRect[1], padding=0, disableAutoRange=False)
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self.setRange(**args)
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def setXLink(self, view):
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"""Link this view's X axis to another view. (see LinkView)"""
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@ -1213,7 +1218,8 @@ class ViewBox(GraphicsWidget):
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@staticmethod
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def forgetView(vid, name):
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if ViewBox is None: ## can happen as python is shutting down
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return
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## Called with ID and name of view (the view itself is no longer available)
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for v in ViewBox.AllViews.iterkeys():
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if id(v) == vid:
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@ -614,7 +614,8 @@ class Parameter(QtCore.QObject):
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about to be made to the tree and only one change signal should be
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emitted at the end.
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Example:
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Example::
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with param.treeChangeBlocker():
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param.addChild(...)
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param.removeChild(...)
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@ -638,11 +639,14 @@ class Parameter(QtCore.QObject):
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def treeStateChanged(self, param, changes):
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"""
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Called when the state of any sub-parameter has changed.
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========== ================================================================
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Arguments:
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param: the immediate child whose tree state has changed.
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note that the change may have originated from a grandchild.
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changes: list of tuples describing all changes that have been made
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in this event: (param, changeDescr, data)
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param The immediate child whose tree state has changed.
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note that the change may have originated from a grandchild.
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changes List of tuples describing all changes that have been made
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in this event: (param, changeDescr, data)
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========== ================================================================
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This function can be extended to react to tree state changes.
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"""
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@ -668,4 +672,4 @@ class SignalBlocker:
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self.exitFn()
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