public Vector2 attract(Mover m)
{
Vector2 force = Vector2.Subtract(location, m.location);
float distance = force.Length();
if (distance > 25f)
{
distance = 25.0f;
}
else if (distance < 5.0f)
{
distance = 5.0f;
}
force.Normalize();
float strength = (G * mass * m.mass) / (distance * distance);
Vector2.Multiply(force, strength);
return force;
}
protected override void Initialize()
{
// Screen Init
graphics.IsFullScreen = false;
graphics.PreferredBackBufferWidth = width;
graphics.PreferredBackBufferHeight = height;
graphics.ApplyChanges();
Window.Title = "Exercise 2.8";
this.IsMouseVisible = true;
// Graphics Init
spriteBatch = new SpriteBatch(GraphicsDevice);
device = graphics.GraphicsDevice;
Helpers.Drawing.init(device, spriteBatch);
device.Clear(Color.White);
// RenderTarget Init
rt = new RenderTarget2D(device, width, height, true, device.DisplayMode.Format, DepthFormat.Depth24, 1, RenderTargetUsage.PreserveContents);
device.SetRenderTarget(rt);
device.Clear(Color.Gray);
device.SetRenderTarget(null);
// Objects Init
movers = new Mover[900];
float step = (float)width/(float)movers.Length;
for (int i = 0; i < movers.Length; i++)
{
movers[i] = new Mover(200, step * i, 0, width, height);
}
attractors = new Attractor[1];
attractors[0] = new Attractor(width, height);
center = new Attractor
//
base.Initialize();
}
protected override void Initialize()
{
// Screen Init
graphics.IsFullScreen = false;
graphics.PreferredBackBufferWidth = width;
graphics.PreferredBackBufferHeight = height;
graphics.ApplyChanges();
Window.Title = "Example 2.7: Attraction with many Movers";
this.IsMouseVisible = true;
// Graphics Init
spriteBatch = new SpriteBatch(GraphicsDevice);
device = graphics.GraphicsDevice;
Helpers.Drawing.init(device, spriteBatch);
// Objects Init
movers = new Mover[20];
for (int i = 0; i < movers.Length; i++)
{
movers[i] = new Mover(rnd.Next(1,50), rnd.Next(50, width - 50), rnd.Next(50, height - 50), width, height);
}
//
base.Initialize();
}
