/// <summary>
/// Creates a wall
/// </summary>
/// <param name="x">x position in pixels</param>
/// <param name="y">y position in pixels</param>
/// <param name="w">width of wall in pixels</param>
/// <param name="h">height of wall in pixels</param>
/// <returns></returns>
private GameObject Wall(Vec2 topLeft, Vec2 bottomRight)
{
// Define the ground body.
var wallBodyDef = new BodyDef();
wallBodyDef.Position.Set(topLeft.X, topLeft.Y);
// Call the body factory which creates the wall box shape.
// The body is also added to the world.
var wallBody = PhysicsWorld.CreateBody(wallBodyDef);
// Define the wall box shape.
var wallShapeDef = new PolygonDef();
wallShapeDef.Friction = 0.3f;
wallShapeDef.Density = 1.0f;
// The extents are the half-widths of the box.
var wallPhysicsSize = new Vec2(Math.Abs(bottomRight.X - topLeft.X), Math.Abs(bottomRight.Y - topLeft.Y));
if (wallPhysicsSize.X <= 0)
{
wallPhysicsSize.X = 1 * GameData.MetersPerPixel;
}
if (wallPhysicsSize.Y <= 0)
{
wallPhysicsSize.Y = 1 * GameData.MetersPerPixel;
}
wallShapeDef.Filter.CategoryBits = (ushort)CollisionCategory.Wall;
wallShapeDef.Filter.MaskBits = (ushort)(CollisionCategory.Player | CollisionCategory.Alien | CollisionCategory.PlayerProjectile | CollisionCategory.AlienProjectile);
wallShapeDef.SetAsBox(wallPhysicsSize.X, wallPhysicsSize.Y);
// Add the ground shape to the ground body.
var shape = wallBody.CreateShape(wallShapeDef);
var vTex = GameUtils.GraphicsVec(wallPhysicsSize);
if (vTex.X <= 0)
{
vTex.X = 1;
}
if (vTex.Y <= 0)
{
vTex.Y = 1;
}
Logger.Info($"Wall created at ({wallBody.GetPosition().X},{wallBody.GetPosition().Y}) " +
$"extends to ({wallBody.GetPosition().X + wallPhysicsSize.X},{wallBody.GetPosition().Y + wallPhysicsSize.Y})");
return(new GameObject(PhysicsWorld, null, shape, wallBody, 0, GameData, GameUtils));
}
/// <summary>
/// Draws this background object using the given SpriteBatch
/// </summary>
/// <param name="spriteBatch"></param>
/// <param name="cameraOrigin"></param>
/// <param name="viewport"></param>
public override void OnDraw(SpriteBatch spriteBatch, Vec2 cameraOrigin, Vector2 viewport)
{
//parallax calculation
//we can use Scale.X and Scale.Y here because they are derived from distance-from-camera
/*var diffx = (WorldPosition.X + ((1 - Scale.X) * cameraOrigin.X)) - cameraOrigin.X;
* var diffy = (WorldPosition.Y + ((1 - Scale.Y) * cameraOrigin.Y)) - cameraOrigin.Y;
*
* var location = new Vector2(diffx * GameData.PixelsPerMeter, diffy * GameData.Instance.PixelsPerMeter);
* spriteBatch.Draw(Texture, location, null, null, null, 0, Scale);
*/
var location = GameUtils.GraphicsVec(WorldPosition - cameraOrigin);
spriteBatch.Draw(Texture, location);
}