circle code

	void DrawCircle(int x, int y, int r, Color color)
	{
		
		// how many segments you want in circle
		int num_segments = 128;
		float radius = r; // radius of circle
		Vector2 center_pos = new Vector2(x,y);
		
		// change angle for each pos in circle
		float delta_angle = 2.0f * Mathf.PI / (float)num_segments;
		
		// points in a circle
		for( int i = 0; i < num_segments; ++i )
		{
			// current angle
			float curr_angle = i * delta_angle;
			
			// direction from center of circle, normalized
			Vector2 dir = new Vector2( Mathf.Cos(curr_angle), Mathf.Sin(curr_angle) );
			
			Vector2 pos = center_pos + dir * radius;
			newTex.SetPixel((int)pos.x,(int)pos.y,color);
		}
	}

how do I fill in the circle

even better how to do I make it glow / fade out around the edges