<｜begin▁of▁sentence｜>### Instruction:
As a network engineer, you may encounter a scenario where you need to determine the intersection point where a line should terminate at a triangle's border. For example, if you are using the NetworkX library to visualize a network topology, and an UpTriangleDrawer instance is initialized with specific context settings, coordinates of a triangle's center, and a source point of a line, you may need to calculate the intersection point of the line with the triangle to ensure accurate representation of network connections.
### Response:
from igraph.drawing.text import TextDrawer
from igraph.drawing import UpTriangleDrawer

# Assuming we have a plot at `plot` and its context at `context`
# Also, assuming we have the center of the triangle at center_x, center_y
# and the source point of a line at source_x, source_y
center_x, center_y = 100, 100
source_x, source_y = 50, 50
triangle_drawer = UpTriangleDrawer(context)
intersection_point = triangle_drawer.intersection_point(source_x, source_y, center_x, center_y)

# Now we could use the intersection_point to draw the line with proper termination
context.line(source_x, source_y, *intersection_point)

text_drawer = TextDrawer(context, "Intersection", halign=TextDrawer.CENTER)
text_drawer.draw_at(intersection_point[0], intersection_point[1], angle=-math.pi/4)
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