lib/gamnit: intro `EulerCamera::center`

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/gamnit/cameras.nit b/lib/gamnit/cameras.nit
index a238d5f..0d64395 100644 (file)
--- a/lib/gamnit/cameras.nit
+++ b/lib/gamnit/cameras.nit
@@ -208,6 +208,9 @@ class UICamera
                return new Point[Float](wx, wy)
        end
 
+       # Center of the screen, from the point of view of the camera, at z = 0
+       fun center: Point3d[Float] do return new Point3d[Float](position.x + width / 2.0, position.y + height / 2.0, 0.0)
+
        # Anchor in the top left corner of the screen, at z = 0
        fun top_left: Point3d[Float] do return new Point3d[Float](position.x, position.y, 0.0)