custom radar with dxDrawImageSection

[JeViCo]

Hello everyone! How can i make minimap using custom image?

I made something like this:

local radarX, radarY, radarWidth, radarHeight = 120, 420, 258, 128
local x, y = getElementPosition(localPlayer)
local mapsize = 3072
--print(x)
dxDrawImageSection(radarX, radarY, radarWidth, radarHeight, x/6000, y/-6000, 270, 270, "files/radar_map.jpg")

I know that gta sa's map size is 6000x6000 and my image resolution is 3072x3072. I can't understand what to do right now

[Pirulax]

Its -3072 - 3072, so its 3072*2 so its 6144.
And please, create a texture for the radar with dxCreateTexture with textureFormat = "dxt3", otherwise the radar itself, just to draw the image will eat 8-10-% CPU.
 

function getMapCoordsFromWorldCoords(x, y, imgSize)
    imgSize = imgSize or 3072
    return ((x + 3072) / 6144) * imgSize, (-(y - 3072) / 6144) * imgSize
end

With this function you can get the 2D coords on the map from world position.
For zoom you need to make the image smaller(zoom in) or bigger(zoom out).
I hope I helped you

If it returns inaccurate positions use this function instead:
 

function getMapCoordsFromWorldCoords(x, y, imgSize)
    imgSize = imgSize or 3072
    return ((x + 3000) / 6000) * imgSize, (-(y - 3000) / 6000) * imgSize
end

The way I did it was, that I got the position from this function, then i subbed usize/2, vsize/2.
So i got the U and V.
The size'll be usize and vsize.
I have a lot of hard work, and time in figuring this out, so, I'll not tell every "secret". 
Think a little bit.

Edited July 20, 2018 by Pirulax

[JeViCo]

i found minimap script where i got essential calculations. Thanks anyway

[Pirulax]

Have a nice day  

Edited July 22, 2018 by Pirulax

[JeViCo]

well\ i met another problem. I tried to place blips using your function, function from another script to get coords but i can't see them\ :с what am i doing wrong