function scr_selectionmatrix_ch1(arg0, arg1)
{
    slmxx = arg0;
    slmyy = arg1;
    s_siner += 2;
    draw_set_color(charcolor);
    draw_rectangle(slmxx, slmyy, slmxx + 210, slmyy + 3, false);
    for (i = 0; i < 12; i += 1)
    {
        myxx = s_siner + (i * (10 * pi));
        draw_set_alpha(sin(myxx / 60));
        draw_line_width(slmxx, slmyy, slmxx, slmyy + 33, 2);
        draw_line_width(slmxx + 210, slmyy, slmxx + 210, slmyy + 33, 2);
        if (cos(myxx / 60) < 0)
        {
            draw_line_width((slmxx - (sin(myxx / 60) * 30)) + 30, slmyy, (slmxx - (sin(myxx / 60) * 30)) + 30, slmyy + 33, 2);
            draw_line_width((slmxx + 210 + (sin(myxx / 60) * 30)) - 30, slmyy, (slmxx + 210 + (sin(myxx / 60) * 30)) - 30, slmyy + 33, 2);
        }
    }
    draw_set_alpha(1);
}