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Added PolyLineROI.getArrayRegion

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Luke Campagnola 2013-03-13 17:17:39 -04:00
parent db5c303fad
commit 2f510de2ca
3 changed files with 40 additions and 8 deletions
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2
examples/ROIExamples.py
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@ -56,7 +56,7 @@ rois.append(pg.MultiRectROI([[20, 90], [50, 60], [60, 90]], width=5, pen=(2,9)))
rois.append(pg.EllipseROI([60, 10], [30, 20], pen=(3,9)))
rois.append(pg.CircleROI([80, 50], [20, 20], pen=(4,9)))
#rois.append(pg.LineSegmentROI([[110, 50], [20, 20]], pen=(5,9)))
#rois.append(pg.PolyLineROI([[110, 60], [20, 30], [50, 10]], pen=(6,9)))
rois.append(pg.PolyLineROI([[80, 60], [90, 30], [60, 40]], pen=(6,9), closed=True))
def update(roi):
img1b.setImage(roi.getArrayRegion(arr, img1a), levels=(0, arr.max()))

4
pyqtgraph/graphicsItems/ImageItem.py
View File

@ -249,7 +249,7 @@ class ImageItem(GraphicsObject):
def render(self):
prof = debug.Profiler('ImageItem.render', disabled=True)
if self.image is None:
if self.image is None or self.image.size == 0:
return
if isinstance(self.lut, collections.Callable):
lut = self.lut(self.image)
@ -269,6 +269,8 @@ class ImageItem(GraphicsObject):
return
if self.qimage is None:
self.render()
if self.qimage is None:
return
prof.mark('render QImage')
if self.paintMode is not None:
p.setCompositionMode(self.paintMode)

36
pyqtgraph/graphicsItems/ROI.py
View File

@ -802,7 +802,11 @@ class ROI(GraphicsObject):
Also returns the transform which maps the ROI into data coordinates.
If returnSlice is set to False, the function returns a pair of tuples with the values that would have
been used to generate the slice objects. ((ax0Start, ax0Stop), (ax1Start, ax1Stop))"""
been used to generate the slice objects. ((ax0Start, ax0Stop), (ax1Start, ax1Stop))
If the slice can not be computed (usually because the scene/transforms are not properly
constructed yet), then the method returns None.
"""
#print "getArraySlice"
## Determine shape of array along ROI axes
@ -810,7 +814,10 @@ class ROI(GraphicsObject):
#print " dshape", dShape
## Determine transform that maps ROI bounding box to image coordinates
try:
tr = self.sceneTransform() * fn.invertQTransform(img.sceneTransform())
except np.linalg.linalg.LinAlgError:
return None
## Modify transform to scale from image coords to data coords
#m = QtGui.QTransform()
@ -1737,12 +1744,35 @@ class PolyLineROI(ROI):
def shape(self):
p = QtGui.QPainterPath()
if len(self.handles) == 0:
return p
p.moveTo(self.handles[0]['item'].pos())
for i in range(len(self.handles)):
p.lineTo(self.handles[i]['item'].pos())
p.lineTo(self.handles[0]['item'].pos())
return p
def getArrayRegion(self, data, img, axes=(0,1), returnMappedCoords=False, **kwds):
sl = self.getArraySlice(data, img, axes=(0,1))
if sl is None:
return None
sliced = data[sl[0]]
im = QtGui.QImage(sliced.shape[axes[0]], sliced.shape[axes[1]], QtGui.QImage.Format_ARGB32)
im.fill(0x0)
p = QtGui.QPainter(im)
p.setPen(fn.mkPen(None))
p.setBrush(fn.mkBrush('w'))
p.setTransform(self.itemTransform(img)[0])
bounds = self.mapRectToItem(img, self.boundingRect())
p.translate(-bounds.left(), -bounds.top())
p.drawPath(self.shape())
p.end()
mask = fn.imageToArray(im)[:,:,0].astype(float) / 255.
shape = [1] * data.ndim
shape[axes[0]] = sliced.shape[axes[0]]
shape[axes[1]] = sliced.shape[axes[1]]
return sliced * mask
class LineSegmentROI(ROI):
"""
@ -1845,8 +1875,8 @@ class SpiralROI(ROI):
#for h in self.handles:
#h['pos'] = h['item'].pos()/self.state['size'][0]
def stateChanged(self):
ROI.stateChanged(self)
def stateChanged(self, finish=True):
ROI.stateChanged(self, finish=finish)
if len(self.handles) > 1:
self.path = QtGui.QPainterPath()
h0 = Point(self.handles[0]['item'].pos()).length()