dxDrawLine scaling

[megaman54]

Hi all! I'm trying to make a box ESP script but i have problems with the lines being too big.

Here is 2 pics to help understand the problem:

Here everything is nice when i'm close to the ped:

But here the lines are too big when i'm far away:

Here is my code so far:

function render() 
    for i,v in ipairs(getElementsByType("ped"))do 
        local x1,y1,z1 = getElementPosition(localPlayer) 
        local x2,y2,z2 = getElementPosition(v) 
        local fDistance = getDistanceBetweenPoints3D(x1,y1,z1,x2,y2,z2) 
  
        if(v ~= localPlayer)then 
            local sx,sy = getScreenFromWorldPosition(x2,y2,z2) 
            dxDrawLine(sx-80, sy-200, sx-80, sy+200, tocolor(255, 0, 0, 255), 2) 
            dxDrawLine(sx-80, sy-200, sx+80, sy-200, tocolor(255, 0, 0, 255), 2) 
        end 
    end 
end 
addEventHandler("onClientRender", root, render) 

Edited June 15, 2013 by Guest

[IIYAMA]

Why don't you use:

https://wiki.multitheftauto.com/wiki/DxDrawLine3D

easier to make 2D/3D boxes.

[megaman54]

But i prefer dxDrawLine because its already 2D.

[IIYAMA]

The problem is that you can't really compare distance with camera size.(as far as I know)

But you can try:

You have two screenshots, create two times this structure.

One close and another one far away.

This is just a sample:

The size of the small one is: 50 px

The size of the large one is: 200 px

The distance is: 10 units.

  
200 - 50  = 150 -- differences 
  
--differences/ units = 
150 / 10 = 15  -- amount of size de-increase per unit 
  
  
local newsize = size -(units * 15)   
if newsize > 0 then 
-- do something. 
end 

[DiSaMe]

IIYAMA, I don't know what you're talking about. The size of the camera is 0 because camera is at one definite point. It doesn't have a size.

megaman54, it's simple to figure out logically. When you are further from the object, it looks smaller. That means, if the distance is bigger, the observable size is smaller. The arithmetic operation whose result is closer to zero with bigger operand is division. So you need to divide the size by distance to get the visible size.

[megaman54]

I will try dividing the distance. Thanks

EDIT: well it dint really wrok, the line goed to wroing direction when i moved..

[denny199]

You could use

getElementBoundingBox 

Something like this:

local minx, miny, minz, mx, my, mz = getElementBoundingBox(value) 
                local x, y, z = getElementPosition(value) 
                dxDrawLine3D(minx+x, miny+y, mz+z+5, minx+x, my+y ,mz+z+5, tocolor(255, 0, 0, 255), 15, false, 0) 
                dxDrawLine3D(minx+x, miny+y, mz+z+5, mx+x, miny+y ,mz+z+5, tocolor(255, 0, 0, 255), 15, false, 0) 
                dxDrawLine3D(mx+x, my+y, mz+z+5, minx+x, my+y ,mz+z+5, tocolor(255, 0, 0, 255), 15, false, 0) 
                dxDrawLine3D(mx+x, miny+y, mz+z+5, mx+x, my+y ,mz+z+5, tocolor(255, 0, 0, 255), 15, false, 0) 

[This will create a square arround the player, used this for a predator missle]

This will resize automatic, as i saw on your picture, you are tryting to make a info box right?

[megaman54]

You could use

getElementBoundingBox 

Something like this:

local minx, miny, minz, mx, my, mz = getElementBoundingBox(value) 
                local x, y, z = getElementPosition(value) 
                dxDrawLine3D(minx+x, miny+y, mz+z+5, minx+x, my+y ,mz+z+5, tocolor(255, 0, 0, 255), 15, false, 0) 
                dxDrawLine3D(minx+x, miny+y, mz+z+5, mx+x, miny+y ,mz+z+5, tocolor(255, 0, 0, 255), 15, false, 0) 
                dxDrawLine3D(mx+x, my+y, mz+z+5, minx+x, my+y ,mz+z+5, tocolor(255, 0, 0, 255), 15, false, 0) 
                dxDrawLine3D(mx+x, miny+y, mz+z+5, mx+x, my+y ,mz+z+5, tocolor(255, 0, 0, 255), 15, false, 0) 

[This will create a square arround the player, used this for a predator missle]

This will resize automatic, as i saw on your picture, you are tryting to make a info box right?

Yes something like that but 2D. Isn't there anyway to scale them in 2D?

[denny199]

Use https://wiki.multitheftauto.com/wiki/Ge ... ldPosition

[megaman54]

Thats what im doing already. See code in original post: https://forum.multitheftauto.com/viewtopic.php?f=91&t=60806&sid=ada856ec7f87816253df745c4ce7276f#p579319