public void DrawLine(float x1, float y1, float x2, float y2,
float width, float r, float g, float b, float a)
{
int texture = getTexture(0);
_graphics.BindTexture2D(texture);
_graphics.LineWidth(width);
_line[0] = new GLVertex(new Vector2(x1, y1), _bottomLeft, r, g, b, a);
_line[1] = new GLVertex(new Vector2(x2, y2), _bottomRight, r, g, b, a);
drawArrays(PrimitiveMode.Lines, _line);
}