[1.8.9]Draw a simple circle

[DjGiannuzz]

I just need to draw a filled circle, that's it, but I can't find anything helpful online. Everything I tried doesn't work.

I'm inside the drawScreen method of a GuiScreen class.

[DjGiannuzz]

Yes, I know, but I need to draw it in slices of different colors and I have a dynamic number of slices.

I really can't find anything on the new renderer class.

[Ernio]

I really can't find anything on the new renderer class.

 

I mean, why do you care? WorldRenderer is just a wrapper for FEW GL methods.

If you want anything fancy you need to use GL directly (google is really your friend).

[DjGiannuzz]

Ok, looks like the problem was another one.

I came up with this:

private static final double twicePI = Math.PI*2;
private static void drawCircle(double x, double y, int radius, int slices)
{
	GL11.glBegin(GL11.GL_TRIANGLE_FAN);
	GL11.glVertex2d(x, y);
	for(int i = 0; i <= slices;i++) 
	{
		GL11.glVertex2d(x + (radius * Math.cos(i *  twicePI / slices)), y + (radius * Math.sin(i * twicePI / slices)));
	}
	GL11.glEnd();
}

This should render a filled circle, centered at (x,y), but i doesn't render anything.

 

If i replace "GL_TRIANGLE_FAN" with "GL_TRIANGLE_STRIPES" and I add "GlStateManager.disableTexture2D();" before I get something, but it's not what i want.

 

Am I forgetting anything?

[DjGiannuzz]

Ok, I fixed the code, now it finally works.

I'll post it, just in case anybody needs it.

public static final double TWICE_PI = Math.PI*2;	
private static Tessellator tessellator = Tessellator.getInstance();
private static WorldRenderer worldRenderer = tessellator.getWorldRenderer();
public static void drawRegularPolygon(double x, double y, int radius, int sides)
{
GL11.glEnable(GL11.GL_BLEND);
GL11.glDisable(GL11.GL_TEXTURE_2D);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);

    worldRenderer.begin(GL11.GL_TRIANGLE_FAN, DefaultVertexFormats.POSITION);
    worldRenderer.pos(x, y, 0).endVertex();
    
for(int i = 0; i <= sides ;i++) 
{
	double angle = (TWICE_PI * i / sides) + Math.toRadians(180);
	worldRenderer.pos(x + Math.sin(angle) * radius, y + Math.cos(angle) * radius, 0).endVertex();
}
    tessellator.draw();
    
    GL11.glEnable(GL11.GL_TEXTURE_2D);
    GL11.glDisable(GL11.GL_BLEND);
}

This will draw a regular polygon with <sides>sides. If you set it high enough, obviosly, you will get a circle.