/// <summary>
/// Gets an object group's thumbnail provided an array of objects.
/// </summary>
/// <param name="objects">The object components to draw.</param>
/// <param name="gd">GraphicsDevice instance.</param>
/// <param name="state">WorldState instance.</param>
/// <returns>Object's ID if the object was found at the given position.</returns>
public Texture2D GetObjectThumb(ObjectComponent[] objects, Vector3[] positions, GraphicsDevice gd, WorldState state)
{
var oldZoom = state.Zoom;
var oldRotation = state.Rotation;
/** Center average position **/
Vector3 average = new Vector3();
for (int i = 0; i < positions.Length; i++)
{
average += positions[i];
}
average /= positions.Length;
state.SilentZoom = WorldZoom.Near;
state.SilentRotation = WorldRotation.BottomRight;
state.WorldSpace.Invalidate();
state.InvalidateCamera();
state.TempDraw = true;
var pxOffset = new Vector2(442, 275) - state.WorldSpace.GetScreenFromTile(average);
var _2d = state._2D;
Promise<Texture2D> bufferTexture = null;
state._2D.OBJIDMode = false;
Rectangle bounds = new Rectangle();
using (var buffer = state._2D.WithBuffer(BUFFER_THUMB, ref bufferTexture))
{
while (buffer.NextPass())
{
for (int i=0; i<objects.Length; i++)
{
var obj = objects[i];
var tilePosition = positions[i];
//we need to trick the object into believing it is in a set world state.
var oldObjRot = obj.Direction;
obj.Direction = Direction.NORTH;
state.SilentZoom = WorldZoom.Near;
state.SilentRotation = WorldRotation.BottomRight;
obj.OnRotationChanged(state);
obj.OnZoomChanged(state);
_2d.OffsetPixel(state.WorldSpace.GetScreenFromTile(tilePosition) + pxOffset);
_2d.OffsetTile(tilePosition);
_2d.SetObjID(obj.ObjectID);
obj.Draw(gd, state);
//return everything to normal
obj.Direction = oldObjRot;
state.SilentZoom = oldZoom;
state.SilentRotation = oldRotation;
obj.OnRotationChanged(state);
obj.OnZoomChanged(state);
}
bounds = _2d.GetSpriteListBounds();
}
}
bounds.X = Math.Max(0, Math.Min(1023, bounds.X));
bounds.Y = Math.Max(0, Math.Min(1023, bounds.Y));
if (bounds.Width + bounds.X > 1024) bounds.Width = 1024 - bounds.X;
if (bounds.Height + bounds.Y > 1024) bounds.Height = 1024 - bounds.Y;
//return things to normal
state.WorldSpace.Invalidate();
state.InvalidateCamera();
state.TempDraw = false;
var tex = bufferTexture.Get();
return TextureUtils.Clip(gd, tex, bounds);
}
