private void SpawnBigCircle()
{
int randomLocationX = GetRandomLocation(GameConstants.SPAWN_BORDER_SIZE, GameConstants.WINDOW_WIDTH - 2 * GameConstants.SPAWN_BORDER_SIZE);
// generate outside window
int randomLocationY = GameConstants.SPAWN_OUTSIDE_WINDOW + GetRandomLocation(GameConstants.SPAWN_BORDER_SIZE, GameConstants.WINDOW_HEIGHT - 2 * GameConstants.SPAWN_BORDER_SIZE);
//random velocity
float speedBigCircle = GameConstants.SPEED_MIN_BIG_CIRCLE + RandomNumberGerator.NextFloat(GameConstants.SPEED_RANGE_CIRCLE);
float angleBigCircle = RandomNumberGerator.NextFloat((float)(2 * Math.PI));
// use sin for x and don't use for y
Vector2 velocity = new Vector2(speedBigCircle * (float)Math.Sin((double)angleBigCircle), speedBigCircle);
if (velocity.Y == 0)
{
velocity.Y = velocity.X;
}
if (velocity.Y < 0)
{
velocity.Y *= -1;
}
string spriteName = @"graphics\bigCircle\" + player.ColorEnamy + "BigCircle";
BigCircle newBigCircle = new BigCircle(Content, spriteName, randomLocationX, randomLocationY, velocity);
bigCircles.Add(newBigCircle);
}
private void SpawnLittleCircle(Rectangle drawRectangleBigCircle)
{
//random x and y
// i>1 because RandomNumberGerator.Next() spawn from 1 to max
// possibility that loop does not work
for (int i = RandomNumberGerator.Next(GameConstants.MAX_COUNT_LITTLE_CIRCLE_AFTER_KILL_BIG_CIRCLE); i >= 1; i--)
{
int randomLocationX = GetRandomLocation(drawRectangleBigCircle.X, 60);
// generate outside window
int randomLocationY = GetRandomLocation(drawRectangleBigCircle.Y, 60);
//random velocity
float speedLittleCircle = GameConstants.SPEED_MIN_LITTLE_CIRCLE_AFTER_KILL_BIG_CIRCLE + RandomNumberGerator.NextFloat(GameConstants.SPEED_RANGE_CIRCLE_AFTER_KILL_BIG_CIRCLE);
float angleLittleCircle = RandomNumberGerator.NextFloat((float)(2 * Math.PI));
// use sin for x and don't use for y
Vector2 velocity = new Vector2(speedLittleCircle * (float)Math.Sin((double)angleLittleCircle), speedLittleCircle);
if (velocity.Y == 0)
{
velocity.Y = velocity.X;
}
if (velocity.Y < 0)
{
velocity.Y *= -1;
}
string spriteName = @"graphics\littleCircle\" + player.ColorEnamy + "LittleCircle";
LittleCircle newLittleCircle = new LittleCircle(Content, spriteName, randomLocationX, randomLocationY, velocity);
littleCircles.Add(newLittleCircle);
}
}
/// <summary>
/// Allows the game to perform any initialization it needs to before starting to run.
/// This is where it can query for any required services and load any non-graphic
/// related content. Calling base.Initialize will enumerate through any components
/// and initialize them as well.
/// </summary>
protected override void Initialize()
{
RandomNumberGerator.Initialize();
base.Initialize();
}
// get random location(int)
private int GetRandomLocation(int min, int range)
{
return(min + RandomNumberGerator.Next(range + 1));
}