public virtual void Move(Player ply, MoveData mv, TimeSpan deltaTime)
{
float Dt = (float)deltaTime.TotalSeconds;
var Body = ply.GetComponent <ECS.Components.PhysicsBody>().Value;
// Movement properties depend on the current tile the player is standing on
var Phys = TileProperties.GetByIndex(World.Map.GetTileAtWorldPosition(Body.Center));
// Apply other forces, like air friction
GetWorldProperties(Body.Center, out WorldProps Props);
Phys.Friction *= Props.AtmosFriction;
// Predict movement this frame
Body.Acceleration = (mv.Acceleration * Phys.PlayerAcceleration);
Vector2 PredictedPos = Body.PredictStepPosition(Dt, Phys.Friction);
//> If predicted movement collides with any world geometry
// then cancel any acceleration and velocity.
//> There are two separate checks for horizontal and vertical movement
// so sliding across walls still works
IfCollidesMultiply(Body, new Vector2(PredictedPos.X, Body.Position.Y), new Vector2(0, 1));
IfCollidesMultiply(Body, new Vector2(Body.Position.X, PredictedPos.Y), new Vector2(1, 0));
// Perform the actual step
Body.Step(Dt, Phys.Friction);
// EVENTUALLY:
// If the player gets stuck in geometry somehow, any collision checks should
// return TRUE here, which means we should rewind the player position until it's not stuck in the geometry
// anymore. Ray casting from current stuck position to previous position.
// Do not do this until the hypothetical bug actually shows up
}
void Rebuild()
{
if (!IsDirty)
{
return;
}
IsDirty = false;
TextureAtlas = new Texture((uint)TextureAtlasSize.X, (uint)TextureAtlasSize.Y);
for (var index = 0; index < TilePropertyIndexes.Length; ++index)
{
var propertyIndex = TilePropertyIndexes[index];
var props = TileProperties.GetByIndex(propertyIndex);
var fileName = Path.Combine("data", "tiles", props.Filename);
if (File.Exists(fileName))
{
SetTileTexture(new Image(fileName), propertyIndex);
}
}
VertexArray.Clear();
for (var index = 0; index < TilePropertyIndexes.Length; ++index)
{
Vector2f TileUV = GetTileUV(TilePropertyIndexes[index]);
var worldPosition = new Vector2f((index % Size.X) * TileSize.X, (index / Size.X) * TileSize.Y);
VertexArray.Append(new Vertex()
{
Position = worldPosition,
TexCoords = new Vector2f(TileUV.X, 0),
Color = Color.White
});
VertexArray.Append(new Vertex()
{
Position = worldPosition + new Vector2f(TileSize.X, 0),
TexCoords = new Vector2f(TileUV.X + TileSize.X, TileUV.Y),
Color = Color.White
});
VertexArray.Append(new Vertex()
{
Position = worldPosition + new Vector2f(TileSize.X, TileSize.Y),
TexCoords = new Vector2f(TileUV.X + TileSize.X, TileUV.Y + TileSize.Y),
Color = Color.White
});
VertexArray.Append(new Vertex()
{
Position = worldPosition + new Vector2f(0, TileSize.Y),
TexCoords = new Vector2f(TileUV.X, TileUV.Y + TileSize.Y),
Color = Color.White
});
}
}
public virtual void GetWorldProperties(Vector2 WorldPosition, out WorldProps WorldProperties)
{
var tilePropertiesIndex = World.Map.GetTileAtWorldPosition(WorldPosition);
var tileProperties = TileProperties.GetByIndex(tilePropertiesIndex);
WorldProperties = new WorldProps
{
// Check if tile solid
// TODO: Check if any other static physics objects in the way
IsSolid = IsSolid(tileProperties),
// Get atmosphere friction
AtmosFriction = 0.987f
};
// space is at index 0
if (tilePropertiesIndex == 0)
{
WorldProperties.AtmosFriction = 1;
}
}
