From 0d5068fdaa6ff94d88d67718c9507732bc6be75f Mon Sep 17 00:00:00 2001
From: Kazhnuz <antoine@sortilege.net>
Date: Thu, 2 May 2019 20:10:31 +0200
Subject: [PATCH] modules/world: add initial way to check if an entity is on
 ground

---
 gamecore/modules/world/actors/actor2D.lua | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/gamecore/modules/world/actors/actor2D.lua b/gamecore/modules/world/actors/actor2D.lua
index c4d8836..6437182 100644
--- a/gamecore/modules/world/actors/actor2D.lua
+++ b/gamecore/modules/world/actors/actor2D.lua
@@ -116,6 +116,7 @@ function Actor2D:setFilter()
 end
 
 function Actor2D:autoMove(dt)
+  self.onGround = false
   self:applyGravity(dt)
 
   local newx, newy, cols, colNumber = self:move(self.x + self.xsp * dt, self.y + self.ysp * dt)
@@ -135,6 +136,7 @@ function Actor2D:solveAllCollisions(cols)
     self:collisionResponse(v)
     if (col.type == "touch") or (col.type == "bounce") or (col.type == "slide") then
       self:changeSpeedToCollisionNormal(col.normal.x, col.normal.y)
+      self:checkGround(col.normal.x, col.normal.y)
     end
   end
 end
@@ -157,6 +159,16 @@ function Actor2D:changeSpeedToCollisionNormal(nx, ny)
   self.xsp, self.ysp = xsp, ysp
 end
 
+function Actor2D:checkGround(nx, ny)
+  if not (self.xgrav == 0) then
+    if nx ~= utils.math.sign(self.xgrav) then self.onGround = true end
+  end
+
+  if not (self.ygrav == 0) then
+    if ny ~= utils.math.sign(self.ygrav) then self.onGround = true end
+  end
+end
+
 function Actor2D:move(dx, dy)
   local cols, colNumber
   self.x, self.y, cols, colNumber = self.world:moveActor(self, dx, dy, self.filter)
@@ -173,6 +185,8 @@ function Actor2D:initGravity()
     self.xgrav = 0
     self.ygrav = 0
   end
+
+  self.onGround = false
 end
 
 function Actor2D:setXGravity(grav)