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Feature: Compute connection point coordinates for non-rectangular shapes (accessed by 'cxn_pt_idx') #628

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Feature: Compute connection point coordinates for non-rectangular shapes (accessed by 'cxn_pt_idx') #628

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55 changes: 41 additions & 14 deletions pptx/shapes/connector.py
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Original file line number Diff line number Diff line change
Expand Up @@ -268,23 +268,50 @@ def _move_begin_to_cxn(self, shape, cxn_pt_idx):
Move the begin point of this connector to coordinates of the
connection point of *shape* specified by *cxn_pt_idx*.
"""
x, y, cx, cy = shape.left, shape.top, shape.width, shape.height
self.begin_x, self.begin_y = {
0: (int(x + cx / 2), y),
1: (x, int(y + cy / 2)),
2: (int(x + cx / 2), y + cy),
3: (x + cx, int(y + cy / 2)),
}[cxn_pt_idx]
self.begin_x, self.begin_y = self._get_shp_cxn_pt(shape, cxn_pt_idx)

def _move_end_to_cxn(self, shape, cxn_pt_idx):
"""
Move the end point of this connector to the coordinates of the
connection point of *shape* specified by *cxn_pt_idx*.
"""
x, y, cx, cy = shape.left, shape.top, shape.width, shape.height
self.end_x, self.end_y = {
0: (int(x + cx / 2), y),
1: (x, int(y + cy / 2)),
2: (int(x + cx / 2), y + cy),
3: (x + cx, int(y + cy / 2)),
}[cxn_pt_idx]
self.end_x, self.end_y = self._get_shp_cxn_pt(shape, cxn_pt_idx)

def _get_shp_cxn_pt(self, shape, cxn_pt_idx):
"""
Function to compute approximate location of the connection points
for a given shape.
"""
name, x, y, cx, cy = shape.name, shape.left, shape.top, shape.width, shape.height
name = name.lower()
if 'parallelogram' in name:
buffer_x = 0.1477732794
connection_points = [
((x + cx / 2), y), # Top shape-midpoint
((x + (buffer_x * cx) / 2), (y + cy / 2)), # Left
((x + ((1 - buffer_x) * cx / 2)), y + cy), # Bottom parallelogram-midpoint
((x + cx / 2), y + cy), # Bottom shape-midpoint
(((x + cx) - buffer_x * cx / 2), (y + cy / 2)), # Right
((x + ((1 - buffer_x) * cx / 2) + + buffer_x * cx), y) # Top parallelogram-midpoint
]
elif 'oval' in name:
buffer_x = 0.1398963731
buffer_y = 0.1509433962
connection_points = [
((x + cx / 2), y), # Top
((x + buffer_x * cx), (y + buffer_y * cy)), # Top-left
(x, (y + cy / 2)), # Left
((x + buffer_x * cx), ((y + cy) - buffer_y * cy)), # Bottom-left
((x + cx / 2), y + cy), # Bottom
(((x + cx) - buffer_x * cx), ((y + cy) - buffer_y * cy)), # Bottom-right
(x + cx, (y + cy / 2)), # Right
(((x + cx) - buffer_x * cx), (y + buffer_y * cy)) # Top-right
]
else:
connection_points = [
((x + cx / 2), y), # Top
(x, (y + cy / 2)), # Left
((x + cx / 2), y + cy), # Bottom
(x + cx, (y + cy / 2)) # Right
]
return connection_points[cxn_pt_idx]