dxDrawRing

[Ceeserxx]

I would love to have this function in addition to dxDrawCircle.
The difference here would be you have a clear ring while the center is empty (unlike in dxDrawCircle where you can just make a color gradient fading out towards the center / outside).
Right now you can only make a ring using images or with a ton of dxDrawLines, but no matter how many calls you make you still see pixels

Example function (like it would be in wiki):
bool dxDrawRing ( float posX, float posY, float outerRadius [, float ringWidth = 5, float startAngle = 0.0, float stopAngle = 360.0, int startColor = white, int stopColor = startColor, int segments = 32, int ratio = 1.0, bool postGUI = false ] )

Required Arguments:
posX, posY -- like dxDrawCircle
outerRadius -- The outer/max radius of the ring

Optional arguments:
ringWidth -- The thickness of the ring, expanding towards the center of the ring (so max allowed should be the 'outerRadius', that would make a full circle)
startAngle, stopAngle -- like dxDrawCircle
startColor -- The color to start at startAngle
stopColor -- The color to end with at stopAngle (That gives the oppertunity to make a ring with a color gradient or a fading-out ring towards the end)
segments, ratio, postGUI -- like dxDrawCircle

Thanks for reading and huge thanks in advance if this gets into the game!

[Ceeserxx]

This is the best way to render a ring in mta at the moment without using an image file - render your own ring by pixels. But this takes quite long, even for just creating a renderTarget/texture its about 400ms with this sizes / detaillevel

SX, SY = guiGetScreenSize();

local sin = math.sin;
local cos = math.cos;
local txd = nil;

function dxDrawRing(posX, posY, outerRadius, ringWidth, startAngle, stopAngle, detailLevel, r, g, b, a)
local pixels = dxGetTexturePixels(dxCreateTexture(outerRadius * 2, outerRadius * 2));

for i = startAngle, stopAngle, 1 / detailLevel do
    local iRad = math.rad(i);

    for radius = outerRadius - ringWidth, outerRadius do
        x = posX + cos(iRad) * radius;
        y = posY + sin(iRad) * radius;

        dxSetPixelColor(pixels, x, y, r, g, b, a);
    end
end

return dxCreateTexture(pixels);

end

txd = dxDrawRing(SY / 4, SY / 4, SY / 4, 10, 0, 360, 10, 255, 165, 0, 64);

function render()
dxDrawImage(SX / 2 - SY / 8, SY / 2 - SY / 8, SY / 4, SY / 4, txd);
end
addEventHandler("onClientRender", root, render);

[Einheit-101]

There is a dxDrawCircle shader that supports drawing rings and its performance is very good.

[Pirulax]

Yep, use shaders, they're fast.