add acceleration calculation

1 files changed, 11 insertions, 2 deletions

diff --git a/wagons.lua b/wagons.lua
index 304061b..540a882 100644
--- a/wagons.lua
+++ b/wagons.lua
@@ -302,9 +302,11 @@ function wagon:on_step(dtime)
 	

 	--FIX: use index of the wagon, not of the train.

 	local velocity=gp.velocity/(gp.path_dist[math.floor(index)] or 1)

+	local acceleration=(gp.last_accel or 0)/(gp.path_dist[math.floor(index)] or 1)

 	local factor=index-math.floor(index)

 	local actual_pos={x=first_pos.x-(first_pos.x-second_pos.x)*factor, y=first_pos.y-(first_pos.y-second_pos.y)*factor, z=first_pos.z-(first_pos.z-second_pos.z)*factor,}

 	local velocityvec={x=(first_pos.x-second_pos.x)*velocity*-1, z=(first_pos.z-second_pos.z)*velocity*-1, y=(first_pos.y-second_pos.y)*velocity*-1}

+	local accelerationvec={x=(first_pos.x-second_pos.x)*acceleration*-1, z=(first_pos.z-second_pos.z)*acceleration*-1, y=(first_pos.y-second_pos.y)*acceleration*-1}

 	

 	--some additional positions to determine orientation

 	local aposfwd=gp.path[math.floor(index+2)]

@@ -321,9 +323,15 @@ function wagon:on_step(dtime)
 	end

 	

 	self.updatepct_timer=(self.updatepct_timer or 0)-dtime

-	if not self.old_velocity_vector or not vector.equals(velocityvec, self.old_velocity_vector) or self.old_yaw~=yaw or self.updatepct_timer<=0 then--only send update packet if something changed

-		self.object:setpos(actual_pos)

+	if not self.old_velocity_vector 

+			or not vector.equals(velocityvec, self.old_velocity_vector)

+			or not self.old_acceleration_vector 

+			or not vector.equals(accelerationvec, self.old_acceleration_vector)

+			or self.old_yaw~=yaw

+			or self.updatepct_timer<=0 then--only send update packet if something changed

+			self.object:setpos(actual_pos)

 		self.object:setvelocity(velocityvec)

+		self.object:setacceleration(accelerationvec)

 		self.object:setyaw(yaw)

 		self.updatepct_timer=2

 		if self.update_animation then

@@ -332,6 +340,7 @@ function wagon:on_step(dtime)
 	end

 	

 	self.old_velocity_vector=velocityvec

+	self.old_acceleration_vector=accelerationvec

 	self.old_yaw=yaw

 	printbm("wagon step", t)

 end