(Two movable vertices and their distances) Write a program that displays two circles with radius 10 at location (40, 40) and (120, 150) with a line connecting the two circles, as shown in Figure...

(Two movable vertices and their distances) Write a program that displays two circles with radius 10 at location (40, 40) and (120, 150) with a line connecting the two circles, as shown in Figure 15.30b. The distance between the circles is displayed along the line. The user can drag a circle. When that happens, the circle and its line are moved, and the distance between the circles is updated.