X-Git-Url: http://nitlanguage.org

diff --git a/examples/mnit_dino/src/game_logic.nit b/examples/mnit_dino/src/game_logic.nit
index 1db0880..6fa0d3f 100644
--- a/examples/mnit_dino/src/game_logic.nit
+++ b/examples/mnit_dino/src/game_logic.nit
@@ -15,7 +15,7 @@
 # limitations under the License.
 
 # Entire game logic for the Dino game
-# Depends only on Nit standard library
+# Depends only on Nit `core` library
 module game_logic
 
 interface Turnable
@@ -34,7 +34,7 @@ class Game
 
 	var over_since = 0
 
-	var score: Container[Int]
+	var score: Ref[Int]
 
 	var random_radius_min = 200
 	var random_radius_max = 400
@@ -43,7 +43,7 @@ class Game
 
 	var entities_sorter = new EntitiesSorter
 
-	init( cavemen_nbr : Int, score: Container[Int] )
+	init( cavemen_nbr : Int, score: Ref[Int] )
 	do
 		srand_from(cavemen_nbr)
 
@@ -159,19 +159,30 @@ end
 class Entity
 	super Turnable
 
-	fun run_over_distance: Int do return 500
+	fun run_over_distance_x: Int do return 50
+	fun run_over_distance_y: Int do return 16
+
 	var pos = new GamePos( 0, 0 )
 
 	fun squared_dist_with_dino( game : Game ) : Int
 	do
 		return pos.squared_dist_with( game.dino.pos )
 	end
+
+	fun under_dino(game: Game): Bool
+	do
+		var dy = pos.y - game.dino.pos.y
+		if dy.abs > run_over_distance_y then return false
+
+		var dx = pos.x - game.dino.pos.x
+		return dx.abs <= run_over_distance_x
+	end
 end
 
 class MovingEntity
 	super Entity
 
-	var going_to : nullable GamePos writable = null
+	var going_to : nullable GamePos = null is writable
 
 	fun speed : Int is abstract
 
@@ -233,8 +244,7 @@ class Dino
 		end
 
 		for i in t.game.items_on_ground do
-			var dwd = i.squared_dist_with_dino(t.game)
-			if dwd < i.run_over_distance then
+			if i.under_dino(t.game) then
 				t.game.items_on_ground.remove i
 				t.game.entities.remove i
 			end
@@ -272,9 +282,7 @@ class Caveman
 	redef fun do_turn( t )
 	do
 		if is_alive then
-			var dwd = squared_dist_with_dino( t.game )
-
-			if dwd < run_over_distance then
+			if under_dino(t.game) then
 				if t.game.dino.is_alive then die(t)
 				return
 			else if is_afraid( t ) then
@@ -282,6 +290,7 @@ class Caveman
 			else if t.game.dino.life <= 0 then
 				# dino is dead, chill
 			else
+				var dwd = squared_dist_with_dino( t.game )
 				if dwd < fear_distance then
 					afraid_until = t.nbr + fear_duration
 
@@ -377,7 +386,8 @@ class Bush super Entity end
 
 # Sort entities on screen in order of Y, entities in the back are drawn first
 class EntitiesSorter
-	super AbstractSorter[Entity]
+	super Comparator
+	redef type COMPARED: Entity
 
 	redef fun compare(a, b) do return b.pos.y <=> a.pos.y
 end