public CGameState(int num_enemies)
{
if (num_enemies > 0)
{
Enemies = new CEnemy[num_enemies];
}
for (int i = 0; i < num_enemies; i++)
{
Enemies[i] = new CEnemy();
}
}
//****************************************************************//
// This function updates the position of each enemy in the game. //
// If it would be in collision with a wall the position is not //
// changed. //
//****************************************************************//
private void UpdatePosition(CSprite sprite, float time_delta)
{
//////////////////////////////////////////////////////////////////
// Update a sprite to be in a new position using it's velocity.
// If it is in a collision, we leave it in current location.
// however, if it is an enemy we move it to it's target position
// ready to find a new direction to move into.
CPoint2f newPos = new CPoint2f();
newPos.X = sprite.Position.X + time_delta * sprite.Velocity.X;
newPos.Y = sprite.Position.Y + time_delta * sprite.Velocity.Y;
bool collisionFire = false;
if (sprite is CEnemy)
{
collisionFire = IsInCollisionWithFire(newPos);
}
if (!IsInCollisionWithWall(newPos) && !collisionFire)
{
sprite.Position.X = newPos.X;
sprite.Position.Y = newPos.Y;
}
else
{
///////////////////////////////////////////////////////////////
// See if sprite is an enemy, if so update it's position to be
// the target position. NOTE: this could make odd behaviour if
// enemy walks too far!
if (sprite is CEnemy)
{
CEnemy enemy = (CEnemy)sprite;
enemy.Position.X = enemy.TargetPosition.X;
enemy.Position.Y = enemy.TargetPosition.Y;
}
}
}