private void DrawBullet(Bullet b, Graphics g)
{
if (b.Exploding && b.ExplosionTick > .5 * BPS) return;
var frame = (Math.Abs(b.ExplosionTick / (int)(.5 / 16 * BPS)) + int.MaxValue / 2) % 16;
g.TranslateTransform((float)b.X, (float)b.Y);
if (b.Exploding)
{
g.DrawImage(ExplosionImage, new Rectangle(-12, -12, 24, 24),
new Rectangle(0 + 24 * (frame % 4), 0 + 24 * (frame / 4), 24, 24), GraphicsUnit.Pixel);
}
else
{
g.RotateTransform((float)b.Angle);
g.DrawImage(BulletImage, new Rectangle(-2, -2, 13, 5));
g.RotateTransform(-(float)b.Angle);
}
g.TranslateTransform(-(float)b.X, -(float)b.Y);
}
private void TickBullet(Bullet b)
{
if (!b.Exploding)
{
b.Y += Sin(b.Angle) * BULLET_SPEED;
b.X += Cos(b.Angle) * BULLET_SPEED;
if (b.X < 0 || b.X > ARENAWIDTH || b.Y < 0 || b.Y > ARENAHEIGHT)
{
b.Exploding = true;
}
var hit = Robots.FirstOrDefault(r => BulletOverlapsRobot(b, r));
if (null != hit)
{
hit.HP -= DAMAGE_PER_BULLET_HIT;
b.Exploding = true;
}
}else
{
++b.ExplosionTick;
if(b.ExplosionTick > 1000)
{
b.Exploded = true;
}
}
}
private bool BulletOverlapsRobot(Bullet b, Robot r)
{
var xd = Math.Abs(b.X - r.X);
var yd = Math.Abs(b.Y - r.Y);
return Math.Sqrt(xd * xd + yd * yd) <= ROBOT_RADIUS + BULLET_RADIUS;
}