private void UpdateMovement()
{
mSpeed = Vector2.Zero;
mDirection = Vector2.Zero;
//Keep last moving decision for stucking
if (LastDecision.X != 0)
StuckedDecision.X = LastDecision.X;
if (LastDecision.Y != 0)
StuckedDecision.Y = LastDecision.Y;
//Indicating stuck on object, state goes to stationary
//Then, use last 2 dimentional move to get out from stuck
if (LastPosition2 == pos)
{
mCurrentState = State.Stationary;
mSpeed = new Vector2(CHARACTER_SPEED, CHARACTER_SPEED);
mDirection = StuckedDecision;
}
//Indicating got out from stuck, change state to walking
if (LastPosition1 == pos && LastDecision != Vector2.Zero)
mCurrentState = State.Walking;
//Position -999, -999 means no target found, stay on or move to its post
if (TargetPosition == new Vector2(-999, -999))
{
//On the post, no movement needed
if (pos.X <= START_POSITION_X+5 && pos.Y <= START_POSITION_Y +5
&& pos.X >= START_POSITION_X - 5 && pos.Y >= START_POSITION_Y - 5)
{
mSpeed = Vector2.Zero;
mDirection = Vector2.Zero;
}
//Out from post, need to go back to the post
//Obtain difference from the first Post, then move close to there
else if (mCurrentState != State.Stationary)
{
//Need some modification +2 or +1 to avoid moving back and forward in short time
if (pos.X > START_POSITION_X+2)
{
currentRow = 1;
mSpeed.X = CHARACTER_SPEED;
mDirection.X = MOVE_LEFT;
}
else if (pos.X <= START_POSITION_X + 2 && pos.X >= START_POSITION_X - 2)
{
//DO NOTHING
}
else
{
currentRow = 2;
mSpeed.X = CHARACTER_SPEED;
mDirection.X = MOVE_RIGHT;
}
if (pos.Y > START_POSITION_Y +2)
{
currentRow = 3;
mSpeed.Y = CHARACTER_SPEED;
mDirection.Y = MOVE_UP;
}
else if (pos.Y <= START_POSITION_Y + 2 && pos.Y >= START_POSITION_Y - 2)
{
//DO NOTHING
}
else
{
currentRow = 0;
mSpeed.Y = CHARACTER_SPEED;
mDirection.Y = MOVE_DOWN;
}
}
}
else //Found target and chase
{
mCurrentState = State.Chasing;
if (pos.X > TargetPos.X - 40)
{
currentRow = 1;
mSpeed.X = CHARACTER_SPEED;
mDirection.X = MOVE_LEFT;
}
else if (pos.X <= TargetPos.X - 37 && pos.X >= TargetPos.X - 43)
{
//DO NOTHING
}
else
{
currentRow = 2;
mSpeed.X = CHARACTER_SPEED;
mDirection.X = MOVE_RIGHT;
}
if (pos.Y > TargetPos.Y - 40)
{
currentRow = 3;
mSpeed.Y = CHARACTER_SPEED;
mDirection.Y = MOVE_UP;
}
else if (pos.Y <= TargetPos.Y - 37 && pos.Y >= TargetPos.Y - 43)
{
//DO NOTHING
}
else
{
currentRow = 0;
mSpeed.Y = CHARACTER_SPEED;
mDirection.Y = MOVE_DOWN;
}
}
}
