private void try_transition(Dir dir) {
// No transition yet.
if (percentage < 1 - straight_per_inc) {
return;
}
TrackPiece newLocation = null;
switch (dir) {
case LEFT:
newLocation = myLocation.getLeft();
break;
case UP:
newLocation = myLocation.getUp();
break;
case DOWN:
newLocation = myLocation.getDown();
break;
case RIGHT:
newLocation = myLocation.getRight();
break;
}
if (newLocation == null) {
handle_end_of_track();
} else {
myLocation = newLocation;
percentage = 0;
// Make sure we keep track of which direction the car is currently going in.
myDir = dir;
}
}
private void handle_down_straight() {
percentage += straight_per_inc;
angle = 90;
x = myLocation.x + myLocation.getW() / 2;
y = myLocation.y + (int) (myLocation.getH() * percentage);
try_transition(Dir.DOWN);
}
private void handle_left_straight() {
percentage += straight_per_inc;
angle = 0;
x = myLocation.x + myLocation.getW() - (int) (myLocation.getH() * percentage);
y = myLocation.y + myLocation.getH() / 2;
try_transition(Dir.LEFT);
}
// Sets the location of this car.
// We will assume that cars start on a right facing straight segment of track.
public void setLocation(TrackPiece track) {
myLocation = track;
moving = true;
x = myLocation.x + myLocation.getW() / 2;
y = myLocation.y + myLocation.getH() / 2;
percentage = .5;
angle = 0; // Starts facing right.
}
private void handle_down_curve_right() {
percentage += curve_per_inc;
int radius = myLocation.getW() * 3 / 4;
angle = (int) (90 - 90 * percentage);
// Angle along the curve.
double theta = Math.toRadians(90 * percentage);
x = (int) (myLocation.x + myLocation.getW() - radius * Math.cos(theta));
y = (int) (myLocation.y + radius * Math.sin(theta));
try_transition(Dir.RIGHT);
}
