/// <summary>
/// creates the inner shell and fires it after the first explosion
/// </summary>
private void InnerShell()
{
//work out the new bullet angle
// in the constructor we have a formula to work out the velocity from the angle
// to find the angle we just reverse the formula
// velocityY = Math.Sin(angleRadians) * -bulletPower
// velocityY/-bulletPower = Math.Sin(angleRadians)
// Math.Asin(velocityY/-bulletPower) = angleRadians
//now we can get the radians on the angle for the bullet
double newBulletAngle;
// before arc sin can be done we need to find the current radian minus any whole rotations
double fullRadiansCal = velocityY / bulletPower;
//reduce the radians to find current heading
while (fullRadiansCal > 1)
{
fullRadiansCal -= 1;
}
//work out radians angle for bullet
newBulletAngle = -1 * Math.Asin(Math.Abs(fullRadiansCal));
// use the radians to get the using the formula in the constructor
// radians = (90 - angle) * (float)Math.PI / 180
// radians/(Math.PI/180) = 90-angle
// (radians/(Math.PI/180))-90 = -angle
//-1 * ( (radians/ (Math.PI/180) ) -90 ) = angle
newBulletAngle = -1 * ((newBulletAngle / (Math.PI / 180)) - 90);
int innerDamage = 30;
int innerRadius = 3;
int innerDestRadius = 4;
int travelDist = 3;
bulletPower = bulletPower * 50; // gets the orginal power of the bullet
//create explosion
Explosion innerExplosion;
innerExplosion = new Explosion(innerDamage,
innerRadius,
innerDestRadius);
//create new bullet
Bullet innerBullet;
// check the velocity to see if the bullet was falling or rising
newBulletAngle = (velocityY <= 0) ? (newBulletAngle *= -1f) : (newBulletAngle);
// work out which way the bullet is travelling to adjust the next shots begining point
if (bulletAngle > 0)
{
//bullet is travelling to the left , new bullet should appear to the left
bulletX = bulletX + travelDist;
bulletY = bulletY + travelDist;
}
if (bulletAngle < 0)
{
//bullet is travelling to the right , new should appear to the right
bulletX = bulletX - travelDist;
bulletY = bulletY - travelDist;
}
//check the angle isn't outside bounds -90 or 90
//change back to limits of game
newBulletAngle = (newBulletAngle < -90) ? (-90) : (newBulletAngle);
newBulletAngle = (newBulletAngle > 90) ? (90) : (newBulletAngle);
//create the inner shell with defined parameters
innerBullet = new Bullet(bulletX,
bulletY,
(float)newBulletAngle,
bulletPower,
this.bulletGravity,
innerExplosion,
bulletOwner
);
//add the bullet into the battle environment
currrentGame.AddEffect(innerBullet);
}
private float bulletPower; // stores the power of the bullet
/// <summary>
/// creates a new bullet
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="angle"></param>
/// <param name="power"></param>
/// <param name="gravity"></param>
/// <param name="explosion"></param>
/// <param name="player"></param>
public PierceBullet(float x, float y, float angle, float power, float gravity, Explosion explosion, GenericPlayer player)
{
// set default values of the new bullet
bulletX = x;
bulletY = y;
bulletGravity = gravity;
bulletExplosion = explosion;
bulletOwner = player;
// now work out how fast this bullet is moving
// workout direction and quickness of bullet
float angleRadians = (90 - angle) * (float)Math.PI / 180; // direction of bullet
float magnitude = power / 50; // movement vector of bullet
// calculate velocity
velocityX = (float)Math.Cos(angleRadians) * magnitude;
velocityY = (float)Math.Sin(angleRadians) * -magnitude;
//store bullet properties
bulletAngle = angleRadians;
bulletPower = magnitude;
}