---------------------------------------------------------------------------
-- Speedometer example mod
---------------------------------------------------------------------------


function init()
	-- Visibility of speedometer
	visible = 0		
	-- Actual current speed
	currentKmh = 0	
	-- Displayed speed (smoothly animated)
	displayKmh = 0	
end
	
	
function tick()
	local v = GetPlayerVehicle()
	if v ~= 0 then
		--Show speedometer if in vehicle
		if visible == 0 then
			--Animate visibible to 1 over 0.5 seconds
			SetValue("visible", 1, "easeout", 0.5)
		end
		--Retrieve speed along forward direction (negative z axis) in local vehicle body transform
		local b = GetVehicleBody(v)
		local t = GetVehicleTransform(v)
		local vel = TransformToLocalVec(t, GetBodyVelocity(b))
		local speed = -vel[3]
		--Speed is in meter per second, convert to km/h
		currentKmh = speed * 3.6
	else
		--Hide speedometer if not in vehicle
		if visible == 1 then
			--Animate visibible to 0 over 0.5 seconds
			SetValue("visible", 0, "easein", 0.5)
		end
		currentKmh = 0
	end
end


function update()
	--Smoothly animate the speed and clamp it between 0 and 300
	--Doing this in update means it will be done independent of frame rate
	displayKmh = 0.95*displayKmh + 0.05*currentKmh
	if displayKmh < 0 then 
		displayKmh = 0 
	end
	if displayKmh > 240 then 
		displayKmh = 240 
	end
end


function draw()
	--Only draw speedometer if visible
	if visible > 0 then
		--Place it in upper right corner
		UiTranslate(UiWidth()+200 - 400*visible, 200)
		UiAlign("center middle")
		if GetBool("savegame.mod.mph") then
			UiImage("mph.png")
			--Convert to rotation for mph
			UiRotate(-displayKmh*2/1.609)
		else
			UiImage("kmh.png")
			--Convert to rotation for kmh
			UiRotate(-displayKmh)
		end
		UiImage("needle.png")
	end
end