DateTime _lastTick = DateTime.Now; // when did we last tell the sprites that time had passed?
#endregion Fields
#region Constructors
public SpaceControl()
{
DoubleBuffered = true; // keeps redraws and screen refresh from happening at the same time
InitializeComponent(); // standard Windows Forms control init function
Ship ship = new Ship(); // create the player's ship
ship.Position = new Vector2F(100, 100);
aiship = new AIShip();
aiship.Position = new Vector2F(800, 100);
Planet planet = new Planet(); // create the big Planet
planet.Position = new Vector2F(400, 300);
float orbit = 200; // how far from the planet's center are the targets?
List<Planet> targets = new List<Planet>();
for (int i = 0; i < NumTargets; ++i)
{
// Create a target. We're using "Planet", but we could use Sprite or a custom Target class.
Planet target = new Planet();
target.ImageFileName = "Images/FlatTarget.gif"; // standard target art
target.Space = this; // add the target to the simulation
// Divide the targets uniformly around the planet.
double angle = i * 2 * Math.PI / NumTargets;
Vector2F offset = new Vector2F(Math.Cos(angle), Math.Sin(angle));
target.Position = planet.Position + offset * orbit;
}
// Add planet, AIShip and ship to simulation.
planet.Space = this;
ship.Space = this;
aiship.Space = this;
}
internal bool IsCollidingWith(Sprite s2)
{
// A Sprite colliding with itself is ignored.
if (this == s2)
return false;
// If a sprite hits something that doesn't exists, ignore.
if (s2._Image == null || this._Image == null)
return false;
if (this is Missile)
{
// Ignore collisions with ships. We are interested in missiles and planets only.
if ((s2 is AIShip) || (s2 is Ship)) return false;
}
else
return false;
Vector2F offset = this.Position - s2.Position;
double my_radius = Math.Sqrt(_Image.Width * _Image.Width + _Image.Height * _Image.Height)/2;
double s2_radius = Math.Sqrt(s2._Image.Width * s2._Image.Width + s2._Image.Height * s2._Image.Height)/2;
if (offset.Length > my_radius + s2_radius)
return false;
Bitmap b = new Bitmap(_Image.Width, _Image.Height);
Graphics g = Graphics.FromImage(b);
Matrix s2_to_world = s2.TransformLocalToWorld;
Matrix world_to_local = TransformLocalToWorld;
world_to_local.Invert();
Matrix s2_to_local = world_to_local;
s2_to_local.Multiply(s2_to_world);
g.Transform = s2_to_local;
Vector2F draw_location = new Vector2F(0,0);
g.DrawImage(s2._Image, draw_location);
for (int x = 0; x < b.Width; ++x)
for (int y = 0; y < b.Height; ++y)
{
Color mine = _Bitmap.GetPixel(x, y);
Color theirs = b.GetPixel(x, y);
if (mine.A > 0.5 && theirs.A > 0.5)
return true;
}
return false;
}
public void Paint(Graphics g)
{
if (null != _Image)
{
g.Transform = TransformLocalToWorld;
// Add the image.
Vector2F draw_location = new Vector2F(0, 0);
g.DrawImage(_Image, draw_location);
}
}