something

void mainImage( out vec4 fragColor, in vec2 fragCoord )
{

    vec2 center = iResolution.xy / 2.0;
    float pi = 3.1415;
    float toAngle = 180.0 / pi;
    float mult = 30.0;
    float radius = pi * mult;
    float dist = sqrt(pow(fragCoord.y - center.y, 2.0) + pow(fragCoord.x - center.x, 2.0));
    float angle = (-atan((fragCoord.x - center.x) / (fragCoord.y - center.y)) * toAngle + 90.0);
    angle = angle / 2.0;
    if(center.y > fragCoord.y)
    {
        angle = (-atan((fragCoord.x - center.x) / (fragCoord.y - center.y)) * toAngle + 90.0) / 2.0 + 90.0;
    }
    angle /= 180.0;
    if(dist < abs(sin(angle)));
    {
        fragColor = vec4(1.0, 1.0, 1.0, 1.0);
    }
    //fragColor = vec4(angle, angle, angle,1.0);
}