for (var i = 12; i > 0; i--)
{
    xprev[i] = xprev[i - 1];
    yprev[i] = yprev[i - 1];
}
xprev[0] = x;
yprev[0] = y;
draw_set_color(image_blend);
draw_line_width(xprev[10], yprev[10], xprev[12], yprev[12], 2);
draw_line_width(xprev[8], yprev[8], xprev[10], yprev[10], 4);
draw_line_width(xprev[4], yprev[4], xprev[8], yprev[8], 6);
draw_line_width(x, y, xprev[4], yprev[4], 8);