Programming GPS and OpenStreetMap Applications with Java

74 6. Objects in Motion

Figure 6.1. Motion can be calculated with geometric rules instead of physical

formulas.

the previous vector in the same direction and same length and draw a

small black circle. The corners of the four squares around this circle define

nine possible destination points (black circles). Pick one of these in the

appropriate direction to match your race track and draw the next vector

for your next move.

For a simple game, nine possible destination points will be adequate.

For a real-world simulation, the destination square is a characteristic ellipse

changing its shape according to the car’s parameters. If the car is going

full speed ...