public static GameObject getNearestEnemyObject(GameObject locationObj)
{
if (objList.Count == 0)
return null;
int nr = -1;
float length = float.MaxValue;
for (int i = 0; i < objList.Count; i++)
{
if (objList[i] is Ball)
{
float newDist;
Vector2.Distance(ref locationObj.position, ref objList[i].position, out newDist);
if (newDist < length)
{
length = newDist;
nr = i;
}
}
}
return objList[nr];
}
private void UpdatePerceptions(GameTime gameTime)
{
nearestObj = null;
nearestObj = Game1.getNearestEnemyObject(Game1.controlShip);
willCollide = false;
if (nearestObj != null)
{
Vector2.Distance(ref nearestObj.position, ref Game1.controlShip.position, out nearestObjDist);
float adjSafetyRadius = safetyRadius + nearestObj.size;
if (nearestObjDist <= adjSafetyRadius)
willCollide = true;
}
}
public override bool checkCollision(GameObject o)
{
float distance = (float)Math.Sqrt(Math.Pow(o.position.X - position.X, 2) + Math.Pow(o.position.Y - position.Y, 2));
return distance < (o.offset.X * o.scale.X) + (m_offset.X * m_scale.X);
}
public virtual bool checkCollision(GameObject o)
{
return false;
}
// spawn an explosion based on a source object
public void spawnExplosion(GameObject o)
{
if(o == null) { return; }
spawnExplosion(o.position, o.velocity);
}
// check if the ship is too close to another object
public bool checkExtendedCollision(GameObject o)
{
float distance = (float)Math.Sqrt(Math.Pow(o.position.X - position.X, 2) + Math.Pow(o.position.Y - position.Y, 2));
return distance < (o.offset.X * o.scale.X) + 125.0f;
}
public override bool Collision(GameObject obj)
{
return base.Collision(obj);
}
public void spawnAsteroidCluster(GameObject o)
{
if(o == null || m_numberOfSmallAsteroids >= m_maxSmallAsteroids) { return; }
Random rand = new Random();
// randomly choose how many small asteroids to spawn from a bigger asteroid
int clusterSize = 0;
int clusterSeed = rand.Next(0, 100);
if(clusterSeed < 34) { clusterSize = 0; } // 34% chance no asteroids
else if(clusterSeed < 76) { clusterSize = 1; } // 42% chance 1 asteroid
else if(clusterSeed < 90) { clusterSize = 2; } // 14% chance 2 asteroids
else if(clusterSeed < 96) { clusterSize = 3; } // 6% chance 3 asteroids
else if(clusterSeed < 100) { clusterSize = 4; } // 4% chance 4 asteroids
// create the corresponding number of mini-asteroids, and set their appropriate locations and directions
// by rotating a pair of x/y co-ordinates around the origin of the original asteroid, randomized at equal
// intervals and set their velocities so they are moving away from the origin of the original asteroid
float angle = (float) (rand.NextDouble() * 359.0f);
float angleIncrement = (360.0f / clusterSize);
Asteroid newAsteroid;
for(int i=0;i<clusterSize;i++) {
newAsteroid = new Asteroid(m_asteroidSprites.getSprite(rand.Next(0, 4) + 2), false, m_settings);
// calculate the velocities of the new asteroid
float minVelocity = (float) (rand.NextDouble() * 0.3f) + 0.007f;
float maxVelocity = (float) (rand.NextDouble() * 2.5f) + 0.8f;
float xVelocity = (float) ( (((rand.Next(0, 2) % 2) == 0) ? 1 : -1) * (rand.NextDouble() * (maxVelocity - minVelocity) + minVelocity) );
float yVelocity = (float) ( (((rand.Next(0, 2) % 2) == 0) ? 1 : -1) * (rand.NextDouble() * (maxVelocity - minVelocity) + minVelocity) );
// set the velocities and locations of the new asteroid
newAsteroid.position = new Vector2((float) (o.position.X + (o.offset.X * Math.Cos(MathHelper.ToRadians(angle)))), (float) (o.position.Y + (o.offset.Y * Math.Sin(MathHelper.ToRadians(angle)))));
newAsteroid.velocity = new Vector2((float) (xVelocity * Math.Cos(MathHelper.ToRadians(angle))), (float) (yVelocity * Math.Sin(MathHelper.ToRadians(angle))));
// store the asteroid
if(newAsteroid.bigAsteroid) { m_numberOfBigAsteroids++; } else { m_numberOfSmallAsteroids++; }
m_asteroids.Add(newAsteroid);
// increment to the next projection angle
angle += angleIncrement;
}
}
