The function surface.DrawLine does not draw the lines the way I want to

[dvd_video]

So, the thing is that I'm drawing four lines instead of one. Here is the red circle, where the drawing ends in the current iteration.

[url]https://drive.google.com/open?id=0B6vgydhudtoAUTFrVkZzSXRYN3M[/url]

Remember when the point is not located in the screen, it's not drawn. ( I am using Position:ToScreen() to the star and the end points )
Well, I was hoping if I make smaller segments, when I cover one segment, the others can be drawn, that do not have covered points.

I am using the same method for drawing circles and when you cover the part of the circle like so, It is drawn:

[url]https://drive.google.com/open?id=0B6vgydhudtoAZUlCNTh6MEVpODQ[/url]

I think its maybe surface.DrawLine's fault, as the tangent of delta X and Y produce the same starting angle or something.
That will explain why am I able to draw a circle using line segments ( Well 250 of them to be exact ), but when cover some of them the others are drawn as the angle tangent is different in every iteration

  -- Draw a line from start to end using key "b" ( blue ) from the palette with line segments in 4 iterations
  Monitor:DrawLine(Start,End,"b","LIN",{4})

  -- Draw a circle at origin "Op" using key "y" ( yellow ) from the palette with line segments in 250 iterations
  Monitor:DrawCircle(Op, mR,"y","LIN",{250})

  function self:SetColor(keyColor)  ----- Sets the drawing color for text and lines
    if(not keyColor) then return end
    local keyColor = keyColor or ColorKey; ColorKey = keyColor
    local rgbColor = (Palette and keyColor) and Palette:Select(keyColor) or White
    surfaceSetDrawColor(rgbColor.r, rgbColor.g, rgbColor.b, rgbColor.a)
    surfaceSetTextColor(rgbColor.r, rgbColor.g, rgbColor.b, rgbColor.a)
  end
  function self:Enclose(xyPnt) ------------ Checks that the point is in the screen
    if(xyPnt.x < sW) then return -1 end
    if(xyPnt.x > eW) then return -1 end
    if(xyPnt.y < sH) then return -1 end
    if(xyPnt.y > eH) then return -1 end
    return 1
  end
  function self:DrawLine(xyS,xyE,keyColor,sMeth,tArg)  --------- Draws a line
    if(not (xyS and xyE)) then return end
    if(not (xyS.x and xyS.y and xyE.x and xyE.y)) then return end
    if(self:Enclose(xyS) == -1 or self:Enclose(xyE) == -1) then return end
    local sdrwMeth = tostring(sMeth or "API")
    if(sdrwMeth == "API") then
      self:SetColor(keyColor)
      surfaceDrawLine(xyS.x,xyS.y,xyE.x,xyE.y) ------- Look here calling the method type above for circle and line
    elseif(sdrwMeth == "LIN") then
      local nIter = tonumber(tArg[1]) or 0
      if(nIter <= 0) then return end
      local nLx, nLy = (xyE.x - xyS.x), (xyE.y - xyS.y)
      local xyD = {x = (nLx / nIter), y = (nLy / nIter)}
      local xyOld, xyNew = {x = xyS.x, y = xyS.y}, {x = 0,y = 0}
      while(nIter > 0) do
        xyNew.x = xyOld.x + xyD.x
        xyNew.y = xyOld.y + xyD.y
        self:DrawLine(xyOld,xyNew,keyColor)
        surfaceDrawCircle(xyNew.x, xyNew.y, 10, Color(255,0,0))
        xyOld.x, xyOld.y = xyNew.x, xyNew.y
        nIter = nIter - 1;
      end
    end
  end
  function self:DrawCircle(xyPos,nRad,keyColor,sMeth,tArg)   ------ Draws a circle
    local sdrwMeth = tostring(sMeth or "API")
    local keyColor = keyColor or ColorKey; ColorKey = keyColor
    local rgbColor = (Palette and keyColor) and Palette:Select(keyColor) or White
    if(sdrwMeth == "API") then surfaceDrawCircle(xyPos.x, xyPos.y, nRad, rgbColor)
    elseif(sdrwMeth == "LIN") then
      local nIter = tonumber(tArg[1]) or 0
      if(nIter <= 0) then return end
      local nCurAng = 0
      local nMaxRot = (GetOpVar("MAX_ROTATION") * mathPi / 180)
      local nItStep = nMaxRot / nIter
      local xyOld, xyNew, xyRad = {x=0,y=0}, {x=0,y=0}, {x=nRad,y=0}
            xyOld.x = xyPos.x + xyRad.x
            xyOld.y = xyPos.y + xyRad.y
      while(nIter > 0) do
        nCurAng = nCurAng + nItStep
        local nSin, nCos = mathSin(nCurAng), mathCos(nCurAng)
        xyNew.x = xyPos.x + (xyRad.x * nCos - xyRad.y * nSin)
        xyNew.y = xyPos.y + (xyRad.x * nSin + xyRad.y * nCos)
        self:DrawLine(xyOld,xyNew,keyColor)  ----- Draw the segment
        xyOld.x, xyOld.y = xyNew.x, xyNew.y
        nIter = nIter - 1;
      end
    end
  end

Do you have any Idea why this happens ?

Best regards !

[MysteryPancake]

:snip:

[dvd_video]

Is anyone there ?

[dvd_video]

[QUOTE=dvd_video;50099545]Is anyone there ?[/QUOTE]

Maybe talking to myself right now, but nobody seems to interest anyway ...

[NeatNit]

I haven't looked into your code, by why not use [img]http://wiki.garrysmod.com/favicon.ico[/img] [url=http://wiki.garrysmod.com/page/render/DrawLine]render.DrawLine[/url] instead of surface? Since you're doing it for 3D space anyway.

[dvd_video]

[QUOTE=NeatNit;50464362]I haven't looked into your code, by why not use [img]http://wiki.garrysmod.com/favicon.ico[/img] [url=http://wiki.garrysmod.com/page/render/DrawLine]render.DrawLine[/url] instead of surface? Since you're doing it for 3D space anyway.[/QUOTE]

Is it going to be more demanding ?

Surface seems rather simple ...

[NeatNit]

it's going to look exactly the same except it would actually work. And no, i don't think it's more demanding, even if it was it would still be negligible compared to rendering as a whole.