public void Update(GameTime gameTime, PlayerLifeForm player)
{
this.Position += Velocity;
MoveTowardPlayer(gameTime, player);
base.Update(gameTime);
}
public void TestNoCollision()
{
PlayerLifeForm player = new PlayerLifeForm()
{
BoundingBox = new Point(100, 100),
Position = new Vector2(350, 350)
};
EnemyLifeForm enemy = new EnemyLifeForm(EvolutionStage.Default, EvolutionStage.Default, EvolutionStage.Default)
{
BoundingBox = new Point(100, 100),
Position = new Vector2(500, 500)
};
Assert.IsFalse(CollisionHandler.ImageTouches(player, enemy));
}
public void CheckOverlapsImages()
{
PlayerLifeForm player = new PlayerLifeForm()
{
BoundingBox = new Point(100, 100),
Position = new Vector2(350, 350)
};
EnemyLifeForm enemy = new EnemyLifeForm(EvolutionStage.Default, EvolutionStage.Default, EvolutionStage.Default)
{
BoundingBox = new Point(100, 100),
Position = new Vector2(350, 350)
};
Vector2 otherIndex = CollisionHandler.PositionToPixelImage(new Vector2(100, 100), player.Position, enemy.Position);
int xMin = (int)otherIndex.X;
int yMin = (int)otherIndex.Y;
Assert.IsTrue((xMin >= 0) && (xMin < 100) && (yMin >= 0) && (yMin < 100));
}
private void MoveTowardPlayer(GameTime gameTime, PlayerLifeForm player)
{
Vector2 differenceToPlayer = player.Position - Position;
//first get direction only by normalizing the difference vector
//getting only the direction, with a length of one
differenceToPlayer.Normalize();
//then move in that direction
//based on how much time has passed
Position += differenceToPlayer * (float)gameTime.ElapsedGameTime.TotalMilliseconds * 1f;
Rotation = Vector2ToRadian(differenceToPlayer) + MathHelper.PiOver2;
}
