lib/gamnit: intro `EulerCamera::center`

[nit.git] / lib / gamnit / cameras.nit

diff --git a/lib/gamnit/cameras.nit b/lib/gamnit/cameras.nit
index df29341..0d64395 100644 (file)
--- a/lib/gamnit/cameras.nit
+++ b/lib/gamnit/cameras.nit
@@ -127,7 +127,7 @@ class EulerCamera
                var view = new Matrix.identity(4)
 
                # Translate the world away from the camera
-               view.translate(-position.x/2.0, -position.y/2.0, -position.z/2.0)
+               view.translate(-position.x, -position.y, -position.z)
 
                # Rotate the camera, first by looking left or right, then up or down
                view = view * rotation_matrix
@@ -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)
 
@@ -227,7 +230,7 @@ class UICamera
                var view = new Matrix.identity(4)
 
                # Translate the world away from the camera
-               view.translate(-position.x/2.0, -position.y/2.0, -position.z/2.0)
+               view.translate(-position.x, -position.y, -position.z)
 
                # Use a projection matrix with a depth
                var projection = new Matrix.orthogonal(0.0, width, -height, 0.0, near, far)