public bool UpdateNPC(NPC npc, Player player, List<Obstacle> visibleObstacles, GameTime gameTime)
{
if (npc.CanSeePlayer(player, visibleObstacles)) return true;
switch (npc.tag)
{
case NPCType.PoliceA:
{
npc.MoveForward(gameTime, 1.0f);
if(collisionController.IllegalMove(npc)) npc.MoveBackward(gameTime, 1.0f);
npc.RotateRight(gameTime, 1.0f);
}
break;
case NPCType.PoliceB:
npc.stateTime += gameTime.ElapsedGameTime.Milliseconds;
double angleToPlayer = Math.Atan2(-1*((double)(player.worldRectangle.Y + (player.worldRectangle.Height / 2)) - (npc.worldRectangle.Y + (npc.worldRectangle.Height / 2))),
((double)(player.worldRectangle.X + (player.worldRectangle.Width / 2)) - (npc.worldRectangle.X + (npc.worldRectangle.Width / 2))));
double facingAngle = Math.Atan2(-1*npc.vision.viewDirection.Y, npc.vision.viewDirection.X);
double turnToAngle = facingAngle - angleToPlayer;
while (turnToAngle < -1 * MathHelper.Pi) turnToAngle += MathHelper.TwoPi;
while (turnToAngle > MathHelper.Pi) turnToAngle -= MathHelper.TwoPi;
switch (npc.state)
{
case NPCState.PatrolRight:
npc.MoveForward(gameTime, 1.0f);
if (collisionController.IllegalMove(npc))
{
npc.MoveBackward(gameTime, 1.0f);
npc.state = NPCState.PatrolRightBackwards;
npc.stateTime = 0;
}
if (Math.Abs(turnToAngle) < npc.vision.viewAngle && visibleObstacles.Count == 0 && player.isVisible && npc.vision.maxViewDistance * 1.5 >
Math.Abs(((player.worldRectangle.Y + (player.worldRectangle.Height / 2)) - (npc.worldRectangle.Y + (npc.worldRectangle.Height / 2)))) +
Math.Abs((player.worldRectangle.X + (player.worldRectangle.Width / 2)) - (npc.worldRectangle.X + (npc.worldRectangle.Width / 2))))
{
npc.state = NPCState.Chase;
npc.stateTime = 0;
}
else if (player.isVisible && npc.vision.maxViewDistance / 2.5 > Math.Abs(((player.worldRectangle.Y + (player.worldRectangle.Height / 2)) - (npc.worldRectangle.Y + (npc.worldRectangle.Height / 2)))) +
Math.Abs((player.worldRectangle.X + (player.worldRectangle.Width / 2)) - (npc.worldRectangle.X + (npc.worldRectangle.Width / 2))))
{
npc.state = NPCState.Investigate;
npc.stateTime = 0;
}
else if (npc.stateTime > 3000)
{
npc.state = NPCState.PatrolLeft;
npc.stateTime = 0;
}
else npc.RotateRight(gameTime, 1.0f);
break;
case NPCState.PatrolLeft:
npc.MoveForward(gameTime, 1.0f);
if (collisionController.IllegalMove(npc))
{
npc.MoveBackward(gameTime, 1.0f);
npc.state = NPCState.PatrolLeftBackwards;
npc.stateTime = 0;
}
if (Math.Abs(turnToAngle) < npc.vision.viewAngle && visibleObstacles.Count == 0 && player.isVisible && npc.vision.maxViewDistance * 1.5 >
Math.Abs(((player.worldRectangle.Y + (player.worldRectangle.Height / 2)) - (npc.worldRectangle.Y + (npc.worldRectangle.Height / 2)))) +
Math.Abs((player.worldRectangle.X + (player.worldRectangle.Width / 2)) - (npc.worldRectangle.X + (npc.worldRectangle.Width / 2))))
{
npc.state = NPCState.Chase;
npc.stateTime = 0;
}
else if (player.isVisible && npc.vision.maxViewDistance / 2.5 > Math.Abs(((player.worldRectangle.Y + (player.worldRectangle.Height / 2)) - (npc.worldRectangle.Y + (npc.worldRectangle.Height / 2)))) +
Math.Abs((player.worldRectangle.X + (player.worldRectangle.Width / 2)) - (npc.worldRectangle.X + (npc.worldRectangle.Width / 2))))
{
npc.state = NPCState.Investigate;
npc.stateTime = 0;
}
else if (npc.stateTime > 3000)
{
npc.state = NPCState.PatrolRight;
npc.stateTime = 0;
}
else npc.RotateLeft(gameTime, 1.0f);
break;
case NPCState.PatrolLeftBackwards:
npc.MoveBackward(gameTime, 1.0f);
if (collisionController.IllegalMove(npc))
{
npc.MoveForward(gameTime, 1.0f);
npc.state = NPCState.PatrolLeft;
npc.stateTime = 0;
}
if (Math.Abs(turnToAngle) < npc.vision.viewAngle && visibleObstacles.Count == 0 && player.isVisible && npc.vision.maxViewDistance * 1.5 >
Math.Abs(((player.worldRectangle.Y + (player.worldRectangle.Height / 2)) - (npc.worldRectangle.Y + (npc.worldRectangle.Height / 2)))) +
Math.Abs((player.worldRectangle.X + (player.worldRectangle.Width / 2)) - (npc.worldRectangle.X + (npc.worldRectangle.Width / 2))))
{
npc.state = NPCState.Chase;
npc.stateTime = 0;
}
else if (player.isVisible && npc.vision.maxViewDistance / 2.5 > Math.Abs(((player.worldRectangle.Y + (player.worldRectangle.Height / 2)) - (npc.worldRectangle.Y + (npc.worldRectangle.Height / 2)))) +
Math.Abs((player.worldRectangle.X + (player.worldRectangle.Width / 2)) - (npc.worldRectangle.X + (npc.worldRectangle.Width / 2))))
{
npc.state = NPCState.Investigate;
npc.stateTime = 0;
}
else if (npc.stateTime > 250)
{
npc.state = NPCState.PatrolLeft;
npc.stateTime = 0;
}
else npc.RotateLeft(gameTime, 2.5f);
break;
case NPCState.PatrolRightBackwards:
npc.MoveBackward(gameTime, 1.0f);
if (collisionController.IllegalMove(npc))
{
npc.MoveForward(gameTime, 1.0f);
npc.state = NPCState.PatrolRight;
npc.stateTime = 0;
}
if (Math.Abs(turnToAngle) < npc.vision.viewAngle && visibleObstacles.Count == 0 && player.isVisible && npc.vision.maxViewDistance * 1.5 >
Math.Abs(((player.worldRectangle.Y + (player.worldRectangle.Height / 2)) - (npc.worldRectangle.Y + (npc.worldRectangle.Height / 2)))) +
Math.Abs((player.worldRectangle.X + (player.worldRectangle.Width / 2)) - (npc.worldRectangle.X + (npc.worldRectangle.Width / 2))))
{
npc.state = NPCState.Chase;
npc.stateTime = 0;
}
else if (player.isVisible && npc.vision.maxViewDistance / 2.5 > Math.Abs(((player.worldRectangle.Y + (player.worldRectangle.Height / 2)) - (npc.worldRectangle.Y + (npc.worldRectangle.Height / 2)))) +
Math.Abs((player.worldRectangle.X + (player.worldRectangle.Width / 2)) - (npc.worldRectangle.X + (npc.worldRectangle.Width / 2))))
{
npc.state = NPCState.Investigate;
npc.stateTime = 0;
}
else if (npc.stateTime > 250)
{
npc.state = NPCState.PatrolRight;
npc.stateTime = 0;
}
else npc.RotateRight(gameTime, 2.5f);
break;
case NPCState.Chase:
if (!player.isVisible || npc.vision.maxViewDistance*2 < Math.Abs(((player.worldRectangle.Y + (player.worldRectangle.Height / 2)) - (npc.worldRectangle.Y + (npc.worldRectangle.Height / 2)))) +
Math.Abs((player.worldRectangle.X + (player.worldRectangle.Width / 2)) - (npc.worldRectangle.X + (npc.worldRectangle.Width / 2))))
{
npc.state = NPCState.PatrolLeft; //Randomize
npc.stateTime = 0;
break;
}
if (Math.Abs(turnToAngle) > .05)
{
if (turnToAngle > 0) npc.RotateLeft(gameTime, 2.0f);
else if (turnToAngle < 0) npc.RotateRight(gameTime, 2.0f);
}
npc.MoveForward(gameTime, 2.0f);
if (collisionController.IllegalMove(npc))
{
npc.MoveBackward(gameTime, 2.0f);
npc.MoveRight(gameTime, 2.0f);
npc.state = NPCState.PatrolLeft; //Randomize
npc.stateTime = 0;
//if (turnToAngle > 0)
//{
// npc.MoveUp(gameTime, 2.0f);
// if (collisionController.IllegalMove(npc))
// {
// npc.MoveDown(gameTime, 2.0f);
// if (Math.Abs(turnToAngle) < MathHelper.PiOver2)
// {
// npc.MoveRight(gameTime, 2.0f);
// if (collisionController.IllegalMove(npc))
// {
// npc.MoveLeft(gameTime, 2.0f);
// npc.state = NPCState.PatrolLeft; //Randomize
// npc.stateTime = 0;
// }
// }
// }
//}
//else if (turnToAngle < 0)
//{
// npc.MoveDown(gameTime, 2.0f);
// if (collisionController.IllegalMove(npc))
// {
// npc.MoveUp(gameTime, 2.0f);
// if (Math.Abs(turnToAngle) < MathHelper.PiOver2)
// {
// npc.MoveLeft(gameTime, 2.0f);
// if (collisionController.IllegalMove(npc))
// {
// npc.MoveRight(gameTime, 2.0f);
// npc.state = NPCState.PatrolLeft; //Randomize
// npc.stateTime = 0;
// }
// }
// }
//}
}
break;
case NPCState.Investigate:
if (!player.isVisible || npc.vision.maxViewDistance / 2 < Math.Abs(((player.worldRectangle.Y + (player.worldRectangle.Height / 2)) - (npc.worldRectangle.Y + (npc.worldRectangle.Height / 2)))) +
Math.Abs((player.worldRectangle.X + (player.worldRectangle.Width / 2)) - (npc.worldRectangle.X + (npc.worldRectangle.Width / 2))))
{
npc.state = NPCState.PatrolLeft; //Randomize
npc.stateTime = 0;
}
else if (Math.Abs(turnToAngle) < npc.vision.viewAngle / 2 && visibleObstacles.Count == 0 && player.isVisible)
{
npc.state = NPCState.Chase;
npc.stateTime = 0;
}
else if (turnToAngle > 0) npc.RotateLeft(gameTime, 3.0f);
else if (turnToAngle < 0) npc.RotateRight(gameTime, 3.0f);
break;
}
break;
}
return false;
}
