From: Alexis Laferrière <alexis.laf@xymus.net>
Date: Mon, 11 Jan 2016 14:11:18 +0000 (-0500)
Subject: lib/gamnit: intro `EulerCamera::look_at`
X-Git-Tag: v0.8~14^2~3
X-Git-Url: http://nitlanguage.org

lib/gamnit: intro `EulerCamera::look_at`

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

diff --git a/lib/gamnit/cameras.nit b/lib/gamnit/cameras.nit
index 2dfc706..df29341 100644
--- a/lib/gamnit/cameras.nit
+++ b/lib/gamnit/cameras.nit
@@ -98,6 +98,17 @@ class EulerCamera
 		position.y += dy
 	end
 
+	# Aim the camera at `x, y, z`
+	fun look_at(x, y, z: Float)
+	do
+		var dx = position.x
+		var dy = position.y
+		var dz = position.z
+
+		yaw = atan2(dx, dz)
+		pitch = atan2(-dy, dz)
+	end
+
 	# Rotation matrix produced by the current rotation of the camera
 	protected fun rotation_matrix: Matrix
 	do