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x2, y2
B
a
c
C
x3, y3
A
b
x1, y1
(a) (b) (c)
F
IGURE
18.35
(a-b) Exercise18.36 enables the user to drag vertices and display the angles dynamically. (c) Exercise18.37
enables the user to drag vertices and display the lines and their intersecting point dynamically.
**18.37
(
Geometry: intersecting point
) Write a program that displays two line seg-
ments with their end points, and their intersecting point. Initially, the end
points are at (
20
,
20
) and (
56
,
130
) for line 1 and at (
100
,
20
) and (
16
,
130
)
for line 2. The user can use the mouse to drag a point and dynamically display
the intersecting point, as shown in Figure 18.35c.
Hint
: See Programming
Exercise 3.25 for finding the intersecting point of two unbounded lines.
