private void HandleBulletCollisions(GameTime gameTime)
{
for (int index = 0; index < battle.Bullets.Count; index++)
{
Bullet bullet = battle.Bullets[index];
Vector2 positionInTiles = bullet.Position / GameSettings.TileSize;
if (!battle.Map.IsOnMap((int)positionInTiles.X, (int)positionInTiles.Y)) // If the bullet is off the map
{
battle.Bullets.RemoveAt(index);
index--;
continue;
}
foreach (Mech mech in battle.AllMechs)
{
if (!mech.IsAlive || bullet.ShooterTeam.Mechs.Contains(mech))
{
continue;
}
if ((mech.Position - bullet.Position).LengthSquared() < GameSettings.TileSize * Math.Max(mech.Size.X, mech.Size.Y))
{
CollisionReport report = CollisionDetector.DetectCollision(bullet, mech, gameTime);
if (report.CollisionOccured == true)
{
ScrapWarsEventManager.GetManager().SendEvent(new BulletHitMechEvent(mech, bullet));
battle.Bullets.RemoveAt(index);
index--;
break;
}
}
}
}
}
public static CollisionReport DetectCollision(CollisionObject objectOne, CollisionObject objectTwo, GameTime gameTime)
{
CollisionObject mainObject;
CollisionObject secondObject;
CollisionReport report = new CollisionReport(objectOne, objectTwo);
if (objectOne.ColorArray.Length < objectTwo.ColorArray.Length) // This is to minimize the number of pixels examined
{
mainObject = objectOne;
secondObject = objectTwo;
}
else
{
mainObject = objectTwo;
secondObject = objectOne;
}
float stepSize = 0.001f;
for (int stepNum = 0; stepNum < gameTime.ElapsedGameTime.Milliseconds / 1000.0f / stepSize; stepNum++)
{
for (int x = 0; x < mainObject.ColorArray.GetLength(0); x++)
{
for (int y = 0; y < mainObject.ColorArray.GetLength(1); y++)
{
Vector2 colorScreenPosition = mainObject.GetTransformedScreenPosition(x, y);
Color colorOne = mainObject.ColorArray[x, y];
Color colorTwo = secondObject.GetColorAtScreenPosition((int)colorScreenPosition.X, (int)colorScreenPosition.Y);
if (colorOne.A > 0 && colorTwo.A > 0)
{
report.RecordCollision(colorScreenPosition);
return(report);
}
}
}
mainObject.Step(stepSize);
}
return(report);
}
