def _cells_to_rects(self, cells):
"""
Converts the extents of a list of cell grid coordinates (i,j) into
a list of rect tuples (x,y,w,h). The set should be disjoint, but may
or may not be minimal.
"""
# Since this function is generally used to generate clipping regions
# or other screen-related graphics, we should try to return large
# rectangular blocks if possible.
# For now, we just look for horizontal runs and return those.
cells = array(cells)
y_sorted = sort_points(cells, index=1) # sort acoording to row
rownums = sort(array(tuple(set(cells[:,1]))))
row_start_indices = searchsorted(y_sorted[:,1], rownums)
row_end_indices = left_shift(row_start_indices, len(cells))
rects = []
for rownum, start, end in zip(rownums, row_start_indices, row_end_indices):
# y_sorted is sorted by the J (row) coordinate, so after we
# extract the column indices, we need to sort them before
# passing them to find_runs().
grid_column_indices = sort(y_sorted[start:end][:,0])
#pdb.set_trace()
#print grid_column_indices.shape
for span in find_runs(grid_column_indices):
x = self._cell_lefts[span[0]]
y = self._cell_bottoms[rownum]
w = (span[-1] - span[0] + 1) * self._cell_extents[0]
h = self._cell_extents[1]
rects.append((x,y,w,h))
return rects
def _cells_to_rects(self, cells):
"""
Converts the extents of a list of cell grid coordinates (i,j) into
a list of rect tuples (x,y,w,h). The set should be disjoint, but may
or may not be minimal.
"""
# Since this function is generally used to generate clipping regions
# or other screen-related graphics, we should try to return large
# rectangular blocks if possible.
# For now, we just look for horizontal runs and return those.
cells = array(cells)
y_sorted = sort_points(cells, index=1) # sort acoording to row
rownums = sort(array(tuple(set(cells[:, 1]))))
row_start_indices = searchsorted(y_sorted[:, 1], rownums)
row_end_indices = left_shift(row_start_indices, len(cells))
rects = []
for rownum, start, end in zip(rownums, row_start_indices,
row_end_indices):
# y_sorted is sorted by the J (row) coordinate, so after we
# extract the column indices, we need to sort them before
# passing them to find_runs().
grid_column_indices = sort(y_sorted[start:end][:, 0])
#pdb.set_trace()
#print grid_column_indices.shape
for span in find_runs(grid_column_indices):
x = self._cell_lefts[span[0]]
y = self._cell_bottoms[rownum]
w = (span[-1] - span[0] + 1) * self._cell_extents[0]
h = self._cell_extents[1]
rects.append((x, y, w, h))
return rects
def arg_find_runs(int_array, order='ascending'):
"""
This function is like find_runs(), but it returns a list of tuples
indicating the start and end indices of runs in the input *int_array*.
"""
if len(int_array) == 0:
return []
assert len(int_array.shape)==1, "find_runs() requires a 1D integer array."
if order == 'ascending':
increment = 1
elif order == 'descending':
increment = -1
else:
increment = 0
rshifted = right_shift(int_array, int_array[0]-increment)
start_indices = concatenate([[0], nonzero(int_array - (rshifted+increment))[0]])
end_indices = left_shift(start_indices, len(int_array))
return zip(start_indices, end_indices)
