Distance from player to (next) checkpoint etc.

koragg · October 13, 2016

Hey everyone. I wanna extract some of the functionality from the race_progressbar resource but I'm not sure what to do here. I need the distance from player to the next checkpoint to be drawn somewhere on the screen with dxdraw so that it updates live when the player moves (I can draw it but not sure how to actually use the code I have to get it first). Other things like total map distance and distance from spawn to first checkpoint are a bonus If anyone can help out, please reply back. Here's what I found that's connected to the things I need :

function calculateCheckpointDistance()
	local total = 0
	local cps = {}
	local cpsSum = {}
	local pos = g_Spawnpoints[1].position
	local prevX, prevY, prevZ = pos[1],pos[2],pos[3]
	for k,v in ipairs(g_Checkpoints) do
		local pos = v.position
		if prevX ~= nil then
			local distance = getDistanceBetweenPoints3D(pos[1],pos[2],pos[3],prevX,prevY,prevZ)
			total = total + distance
			cps[k] = distance
			cpsSum[k] = total
		end
		prevX = pos[1]
		prevY = pos[2]
		prevZ = pos[3]
	end
	g_CheckpointDistance = cps
	g_CheckpointDistanceSum = cpsSum
	g_TotalDistance = total
end

function distanceFromPlayerToCheckpoint(player, i)
	-- TODO: check if the index exists
	local checkpoint = g_Checkpoints[i]
	if checkpoint == nil then
		return false
	end
	local x, y, z = getElementPosition(player)
	return getDistanceBetweenPoints3D(x, y, z, unpack(checkpoint.position))
end

function calculateDistance(headingForCp,distanceToCp)
	local sum = g_CheckpointDistanceSum[headingForCp]
	if sum == nil then
		return false
	end
	local checkpointDistance = g_CheckpointDistance[headingForCp]
	if distanceToCp > checkpointDistance then
		distanceToCp = checkpointDistance
	end
	return sum - distanceToCp
end
function calculateDistance2(headingForCp,distanceToCp)
	local sum = 0
	for k,v in ipairs(g_CheckpointDistance) do
		sum = sum + v
		if headingForCp == k then
			if distanceToCp > v then
				distanceToCp = v
			end
			sum = sum - distanceToCp
			return sum
		end
	end
	return 0
end

This was in the client.lua file of the resource (couldn't find mta community link so sry for github one instead).

Captain Cody · October 13, 2016

distanceFromPlayerToCheckpoint(player, i)

That's what you need to use..

koragg · October 13, 2016

21 minutes ago, CodyL said:
distanceFromPlayerToCheckpoint(player, i)
That's what you need to use..

Yes but, how to make it output as dxdrawing? I tried adding dxdraw under the 'return' part and it started giving errors that g_Checkpoints[i] is undefined and stuff like that. Used this but still didn't work I think:

g_Checkpoints = getAll("checkpoint")

Edited October 13, 2016 by koragg

Captain Cody · October 13, 2016

add a onClientRender event -

then use this

dxDrawText(distanceFromPlayerToCheckpoint(player, i) -- Other stuff for dxDrawText

koragg · October 14, 2016

It draws "false" instead of distance with the following code. No errors in debug at all.

local sx_, sy_ = guiGetScreenSize ( )
local sx, sy = sx_/1440, sy_/900

function distanceFromPlayerToCheckpoint(player, i)
    g_Checkpoints = getAll("checkpoint")
	local checkpoint = g_Checkpoints[i]
	if checkpoint == nil then
		return false
	end
	local x, y, z = getElementPosition(player)
	return getDistanceBetweenPoints3D(x, y, z, unpack(checkpoint.position))
end

function getAll(name)
	local result = {}
	for i,element in ipairs(getElementsByType(name)) do
		result[i] = {}
		result[i].id = getElementID(element) or i
		local position = {
					tonumber(getElementData(element,"posX")),
					tonumber(getElementData(element,"posY")),
					tonumber(getElementData(element,"posZ"))
				}
		result[i].position = position;
	end
	return result
end

function draw()
    dxDrawText(tostring(distanceFromPlayerToCheckpoint(player, i)), sx_ * 1.5200, sy_ * 0.9843, sx_ * 0.2172, sy_ * 1.0167, tocolor(131, 253, 1, 255), 0.55*sy, "bankgothic", "center", "top", false, false, false, false, false)
end
addEventHandler("onClientRender", root, draw)

I did 'tostring' on line 30 as that's what it said in debug as the only error.

Edited October 14, 2016 by koragg

dugasz1 · October 14, 2016

player and i variable isn't defined in line 30. Use localPlayer instead player draw it in a for.

koragg · October 14, 2016

I replaced *player* to *localPlayer but still same thing, draws "false" with no errors in debug.

quindo · October 15, 2016

Where are you defining "i" variable? I don't see it anywhere in the code.

koragg · October 15, 2016

Not sure how to define it

Gravestone · October 15, 2016

21 hours ago, koragg said:

dxDrawText(tostring(distanceFromPlayerToCheckpoint(player, i)), sx_ * 1.5200, sy_ * 0.9843, sx_ * 0.2172, sy_ * 1.0167, tocolor(131, 253, 1, 255), 0.55*sy, "bankgothic", "center", "top", false, false, false, false, false)

Neither 'player' nor 'i' is defined in the 'draw' function.

Gravestone · October 15, 2016

Sorry for being late to edit the post. Anyways, if you're using the default race gamemode then this code will do the job:

local sx_, sy_ = guiGetScreenSize ( )
local sx, sy = sx_/1440, sy_/900

function distanceFromPlayerToCheckpoint(player, i)
    g_Checkpoints = getAll("checkpoint")
	local checkpoint = g_Checkpoints[getElementData(player, "race.checkpoint")]
	if checkpoint == nil then
		return false
	end
	local x, y, z = getElementPosition(player)
	return getDistanceBetweenPoints3D(x, y, z, unpack(checkpoint.position))
end

function getAll(name)
	local result = {}
	for i,element in ipairs(getElementsByType(name)) do
		result[i] = {}
		result[i].id = getElementID(element) or i
		local position = {
					tonumber(getElementData(element,"posX")),
					tonumber(getElementData(element,"posY")),
					tonumber(getElementData(element,"posZ"))
				}
		result[i].position = position;
	end
	return result
end

function draw() 
    dxDrawText(tostring(distanceFromPlayerToCheckpoint(localPlayer)), sx_ * 1.5200, sy_ * 0.9843, sx_ * 0.2172, sy_ * 1.0167, tocolor(0, 0, 0, 255), 0.55*sy, "bankgothic", "center", "top", false, false, false, false, false)
end
addEventHandler("onClientRender", root, draw)

koragg · October 15, 2016

Yes, it does work. Just one thing, is it in meters? Because when I'm right next to a cp it says "20".

Down right side, red number under the HUD :

Edited October 15, 2016 by koragg

Gravestone · October 15, 2016

I guess yeah, it's in meters. It shows 20 because you're really 20 GTA meters away from the checkpoint. The position of the checkpoint is right in the center of it. Due to it's scale being enlarged, I thought that there was some problem too.

koragg · October 15, 2016

Xiti said this on skype "You need then to subtraction the size of checkpoint to have at accurate" but I couldn't find anything relevant around Google, any thoughts?

Gravestone · October 15, 2016

4 minutes ago, koragg said:

Xiti said this on skype "You need then to subtraction the size of checkpoint to have at accurate" but I couldn't find anything relevant around Google, any thoughts?

Well I don't think so you can achieve the checkpoint(marker) element anyway and then getMarkerSize. However, you can just subtract a specific number from the distance. By viewing the above photo, you can try -15.

koragg · October 15, 2016

2 minutes ago, Gravestone said:

Well I don't think so you can achieve the checkpoint(marker) element anyway and then getMarkerSize. However, you can just subtract a specific number from the distance. By viewing the above photo, you can try -15.

About the -15, isn't that different if cp size is bigger/smaller than the one on the pic?

Gravestone · October 15, 2016

1 minute ago, koragg said:

About the -15, isn't that different if cp size is bigger/smaller than the one on the pic?

Yes it would be. I thought you have similar checkpoint size for every map. You can try something else then.

koragg · October 15, 2016

g_Checkpoints = getAll("checkpoint")
local checkpoint = g_Checkpoints[getElementData(player, "race.checkpoint")]
local size = getMarkerSize ( checkpoint )

Can this work?

Gravestone · October 15, 2016

I guess so, try it.

koragg · October 15, 2016

6 minutes ago, Gravestone said:

I guess so, try it.

Nope, gave these errors.

Gravestone · October 15, 2016

Well then the table is not returning the marker element. Try getElementByID maybe.

koragg · October 17, 2016

Tried this and while there are no errors, there is no distance now as well.

local sx_, sy_ = guiGetScreenSize ( )
local sx, sy = sx_/1440, sy_/900

function draw()
	for k,v in ipairs(getElementsByType("player")) do
		local state = getElementData(v, "player state")
		if state == "Spectating" or state == "Away" or state == "Dead" or state == "Finished" or state == "Not Ready" then return end
		if distanceFromPlayerToCheckpoint(localPlayer) then
		distance = round(distanceFromPlayerToCheckpoint(localPlayer))
		local cp = getElementByID("checkpoint")
		if cp then
		local size = getMarkerSize (cp)
		if size then
		local fix = distance - size
		dxDrawText(fix.." m to next checkpoint", sx_ * 0.8734, sy_ * 0.2009, sx_ * 0.9510, sy_ * 0.2259, tocolor(254, 254, 34, 255), 1*sy, "default-bold", "center", "top", false, false, false, false, false)
		end
		end
		end
	end
end
addEventHandler("onClientRender", root, draw)

Edited October 17, 2016 by koragg

Gravestone · October 17, 2016

2 hours ago, koragg said:

Tried this and while there are no errors, there is no distance now as well.

That is because:

2 hours ago, koragg said:

local cp = getElementByID("checkpoint")

if cp then

Line 11 checks if the getElementByID had returned the ID of the given element. In this case, you're using the first argument as a string, which has to be an element instead.

Quote

id: The ID of the element as it appears in the XML file or as set by setElementID.

Gimme some time, I'll try to figure it out.
Edit: Done, here's how it will work:



local sx_, sy_ = guiGetScreenSize ( )
local sx, sy = sx_/1440, sy_/900

function distanceFromPlayerToCheckpoint(player, i)
    g_Checkpoints = getAll("checkpoint")
	local checkpoint = g_Checkpoints[getElementData(player, "race.checkpoint")]
	if checkpoint == nil then
		return false
	end
	local x, y, z = getElementPosition(player)
	for i, v in ipairs(checkpoint) do
		outputChatBox(unpack(v))
	end
	return getDistanceBetweenPoints3D(x, y, z, unpack(checkpoint.position)), unpack(checkpoint.size)
end

function getAll(name)
	local result = {}
	for i,element in ipairs(getElementsByType(name)) do
		result[i] = {}
		result[i].id = getElementID(element) or i
		local position = {
					tonumber(getElementData(element,"posX")),
					tonumber(getElementData(element,"posY")),
					tonumber(getElementData(element,"posZ"))
				}
		local size = {
					tonumber(getElementData(element, "size"))
				}
		result[i].position = position;
		result[i].size = size;
 	end
	return result
end

function draw() 
	local distance, size = distanceFromPlayerToCheckpoint(localPlayer)
    dxDrawText(distance-size*5, sx_ * 1.5200, sy_ * 0.9843, sx_ * 0.2172, sy_ * 1.0167, tocolor(0, 0, 0, 255), 0.55*sy, "bankgothic", "center", "top", false, false, false, false, false)
end
addEventHandler("onClientRender", root, draw)

Edited October 17, 2016 by Gravestone

koragg · October 17, 2016

attempt to perform aritmetic on local size a nil value

Dealman · October 17, 2016

That means you're trying to do some math on something that returns nil. For example nil+1 obviously wouldn't make sense. The error will tell you at what line this error occurred - use that to find what is returning nil and work from there.

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Distance from player to (next) checkpoint etc.

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