Basic SFML.NET / Box2DX example

Box2DBasic.cs

using System;
using System.Diagnostics;
using Box2DX.Collision;
using Box2DX.Common;
using Box2DX.Dynamics;
using SFML.Graphics;
using SFML.Window;
using Color = SFML.Graphics.Color;

namespace TestingSFML
{
	static class Program
	{
		static void Main()
		{
			// Create the main window
			RenderWindow app = new RenderWindow(new VideoMode(800, 600), "SFML Works!");

			// Set the function to be called when window is closed
			app.Closed += OnClose;

			// Set the max framerate for the window
			app.SetFramerateLimit(60);
			
			// Set the background color of the window
			Color windowColor = new Color(0, 192, 255);

			// ----------- Start Physics World Setup
			// Set gravity value
			Vec2 gravity = new Vec2(0, 10.0f);

			AABB worldAabb = new AABB();
			worldAabb.LowerBound.Set(-200.0f, -100.0f);
			worldAabb.UpperBound.Set(200.0f, 200.0f);

			// Setup the world for Box2D
			World world = new World(worldAabb, gravity, false);
			CreateGround(world, 400, 500);

			// Lambda Expression
			// This is what happens whenever a mouse button is clicked
			app.MouseButtonPressed += (sender, args) =>
			{
				int mouseX = Mouse.GetPosition(app).X;
				int mouseY = Mouse.GetPosition(app).Y;

				CreateBox(world, mouseX, mouseY);
			};

			// Make a stopwatch object
			// We use this to calculate Elapsed Time
			// We dont use this at all in this function
			// I was just testing this out
			Stopwatch calculatedElapsedTime = new Stopwatch();

			// Start the game loop
			while (app.IsOpen())
			{
				// Start the timer
				calculatedElapsedTime.Start();

				// Process events
				app.DispatchEvents();

				// We have to update the Physics World
				// So we step through the process like this
				world.Step(1 / 60.0f, 8, 1);

				// Clear screen
				app.Clear(windowColor);

				// ------------- Start Drawing

				// Iterate through the bodies
				// draw what was passed in User Data
				Body body = world.GetBodyList();
				while (body.GetNext() != null)
				{
					// We get the sprite that was passed in from user data
					Sprite sprite = (Sprite) body.GetUserData();

					// We need to get the position from the physics world
					// And then we reset the position of the sprite
					sprite.Position = new Vector2f(30.0f * body.GetPosition().X, 30.0f * body.GetPosition().Y);

					// We then need to do the same to the rotation
					sprite.Rotation = body.GetAngle()*180/Settings.Pi;
					
					// We then draw the sprite
					app.Draw(sprite);

					// And then we get the next body
					body = body.GetNext();
				}

				// ------------ End Drawing

				// We would stop the timer here
				// And then reset it
				calculatedElapsedTime.Stop();

				// Get elapsed time
				TimeSpan ts = calculatedElapsedTime.Elapsed;

				// Make sure we reset the timer
				calculatedElapsedTime.Reset();

				// Output the time so we can see if its what we want
				//Console.WriteLine(ts);

				// Update the window
				app.Display();

			} //End game loop

		} //End Main()

		static void OnClose(object sender, EventArgs e)
		{
			// Close the window when OnClose event is received
			RenderWindow window = (RenderWindow)sender;
			window.Close();
		}

		// Lets create the ground
		public static void CreateGround(World world, float x, float y)
		{
			// We need to define a body with the position
			BodyDef bodyDef = new BodyDef();

			// Box2D doesn't use pixel measurement
			// So we need to divide by 30
			// 1m = 30px
			bodyDef.Position.Set(x / 30.0f, y / 30.0f);

			// Create the physics body
			Body body = world.CreateBody(bodyDef);

			// Define a new shape def
			PolygonDef shapeDef = new PolygonDef();
			shapeDef.SetAsBox((800.0f / 2) / 30.0f, (16.0f / 2) / 30.0f);
			shapeDef.Density = 0.0f;

			// Create a texture from filename
			Texture groundTexture = new Texture("ground.png");
			
			// Create a sprite based on texture
			// In order to draw it properly we need
			// to set the origin
			Sprite sprite = new Sprite(groundTexture) { Origin = new Vector2f(400, 8) };

			// We then set the user data in the body
			// so we can access it later on
			body.SetUserData(sprite);
			
			// Finalize the shape and body
			body.CreateShape(shapeDef);
			body.SetMassFromShapes();
		}

		// Create a box
		public static void CreateBox(World world, int mouseX, int mouseY)
		{
			// We need to define a body with the position
			BodyDef bodyDef = new BodyDef();

			// Box2D doesn't use pixel measurement
			// So we need to divide by 30
			// 1m = 30px
			bodyDef.Position.Set(mouseX / 30.0f, mouseY / 30.0f);

			// Create the physics body
			Body body = world.CreateBody(bodyDef);

			// Define a new shape def
			PolygonDef shapeDef = new PolygonDef();
			shapeDef.SetAsBox((32.0f / 2) / 30.0f, (32.0f / 2) / 30.0f);

			// Set the shape properties
			shapeDef.Density = 1.0f;
			shapeDef.Friction = 0.7f;

			// Create a texture from filename
			Texture boxTexture = new Texture("box.png");

			// Create a sprite based on texture
			// In order to draw it properly we need
			// to set the origin
			Sprite sprite = new Sprite(boxTexture) {Origin = new Vector2f(16, 16)};

			// We then set the user data in the body
			// so we can access it later on
			body.SetUserData(sprite);

			// Finalize the shape and body
			body.CreateShape(shapeDef);
			body.SetMassFromShapes();
		}

	} //End Program
}