2D Circle / Rounded Corner Rect Rendering

[PlumpOrange]

I have been trying to render a 2D circle on a GUI. Here is what I ended up with after a lot of google searches:
 

public static void drawCirc(double p_73734_0_, double p_73734_1_, double p_73734_2_, int p_73734_4_) {
        float var10 = (float) (p_73734_4_ >> 24 & 255) / 255.0F;
        float var6 = (float) (p_73734_4_ >> 16 & 255) / 255.0F;
        float var7 = (float) (p_73734_4_ >> 8 & 255) / 255.0F;
        float var8 = (float) (p_73734_4_ & 255) / 255.0F;
        double increment = 2*Math.PI/50;
        double cx = p_73734_0_;
        double cy = p_73734_1_;
        double radius = p_73734_2_;

        GL11.glColor4f(var6, var7, var8, var10);

        for(double angle = 0; angle < 2*Math.PI; angle+=increment){
            GL11.glBegin(GL11.GL_POLYGON);
            GL11.glVertex2d(cx,cy);
            GL11.glVertex2d(cx + Math.cos(angle)* radius, cy +
                    Math.sin(angle)*radius);
            GL11.glVertex2d(cx + Math.cos(angle + increment)*radius, cy +
                    Math.sin(angle + increment)*radius);
            GL11.glEnd();
        }
    }

However, it is not rendering. Nothing is coming up. I have tried a variety of tweaks to this code, but nothing is working.

I am unsure if mc's default tesselator is overriding my vertex's and stopping it from rendering or if I am being stupid, but no matter what I try, it doesn't render a circle.

I am hoping after I figure out how to render a circle, I can try rendering a rounded rectangle, but so far, it does not look promising. I am hoping someone on here knows how to do this correctly.
 

 

 

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P.S. I am using MCP, but I am sure you guys are still able to help.

 

Edited September 30, 2019 by PlumpOrange

[PlumpOrange]

4 hours ago, diesieben07 said:

Jarmodding is not supported on this forum.

Both mods and clients use OpenGL, my question would still apply to either. I'm just trying to figure out why my circle isn't rendering. Also, I've made posts on here about mcp development in the past, and outside of this account, with no issue. I don't understand why you are so strict on what platform you modify on.