/// <summary>
/// Initializes a new instance of the BodyPartInfo class.
/// </summary>
/// <param name="entity">The body part entity.</param>
/// <param name="bodyPartComponent">The body part component.</param>
/// <param name="physicsComponent">The physics component.</param>
public BodyPartInfo(Entity entity, BodyPartComponent bodyPartComponent, PhysicsComponent physicsComponent)
{
this.Entity = entity;
this.BodyPartComponent = bodyPartComponent;
this.PhysicsComponent = physicsComponent;
}
/// <summary>
/// Create the body part entity.
/// </summary>
/// <param name="bodyEntity">The body entity that the torso belongs to.</param>
/// <param name="bodyPart">The type of body part.</param>
/// <param name="spriteType">The sprite type.</param>
/// <param name="spriteFamily">The sprite family.</param>
/// <param name="position">The world position of the body part.</param>
/// <param name="collisionGroup">The collision group of the body part.</param>
/// <param name="spriteVariation">The sprite variation.</param>
/// <param name="isPhysical">Indicates whether the body part can collide with physics objects.</param>
/// <returns>The body part entity and the component.</returns>
private BodyPartInfo AssembleBodyPart(
Entity bodyEntity,
BodyPart bodyPart,
string spriteType,
string spriteFamily,
Vector2 position,
short collisionGroup,
int spriteVariation = -1,
bool isPhysical = true)
{
Entity entity = this.world.EntityManager.CreateEntity();
// Add the body part
var bodyPartComponent = new BodyPartComponent(bodyEntity, bodyPart);
this.world.EntityManager.AddComponent(entity, bodyPartComponent);
// Add the sprite
string spriteName =
this.world.Resources.GetSpriteName("body", spriteType, spriteFamily, spriteVariation);
this.world.EntityManager.AddComponent(entity, new SpriteComponent(spriteName));
Body body;
if (isPhysical)
{
// Get the texture data for the sprite
Rectangle rectangle = this.world.Resources.GetSpriteRectangle(spriteName);
uint[] spriteData = new uint[rectangle.Width * rectangle.Height];
this.world.Resources.SpriteSheet.GetData(0, rectangle, spriteData, 0, spriteData.Length);
// Create a polygon for the sprite texture
Vertices vertices = PolygonTools.CreatePolygon(spriteData, rectangle.Width, true);
// Scale the vertices from pixels to physics-world units
var scale = new Vector2(Const.PixelsToMeters, -Const.PixelsToMeters);
vertices.Scale(ref scale);
// Partition into smaller polygons to split concave segments
List<Vertices> convexVertices = BayazitDecomposer.ConvexPartition(vertices);
// Create the body
body = BodyFactory.CreateCompoundPolygon(this.world.Physics, convexVertices, 1.0f);
}
else
{
// Create a tiny rectangle since this isn't a physical body. A body is just created so that the body
// part can be welded onto other parts
body = BodyFactory.CreateRectangle(this.world.Physics, 0.001f, 0.001f, 1.0f);
}
body.IsStatic = false;
body.CollisionGroup = collisionGroup;
body.IsSensor = !isPhysical;
// Add the physics component
var physicsComponent = new PhysicsComponent(body);
this.world.EntityManager.AddComponent(entity, physicsComponent);
// Add the position component
this.world.EntityManager.AddComponent(entity, new PositionComponent(body, position));
// Add the scale component
this.world.EntityManager.AddComponent(entity, new ScaleComponent(Const.PixelsToMeters));
return new BodyPartInfo(entity, bodyPartComponent, physicsComponent);
}