The Atari Compendium/The Atari Compendium (Toad Computers) (1994).iso/files/prgtools/programm.ing/progem.lzh/gemcl2.c

Text File | 1986-07-16 | 4.2 KB | 166 lines

/* >>>>>>>>>>>>>>>>>>>>>>>>> Sample Redraw Code <<<<<<<<<<<<<<<<<<<<<<<<<<< */

VOID
do_redraw(wh, area)        /* wh = window handle from msg[3] */
WORD    wh;        /* area = pointer to redraw rect- */
GRECT    *area;        /*   tangle in msg[4] thru msg[7] */
{
    GRECT    box;

    graf_mouse(M_OFF, 0x0L);
    wind_update(BEG_UPDATE);

    wind_get(wh, WF_FIRSTXYWH, &box.g_x, &box.g_y, &box.g_w, &box.g_h);
    while ( box.g_w && box.g_h )
    {
        if (rc_intersect(full, &box))      /* Full is entire screen */
            if (rc_intersect(area, &box))
            {
                if (wh == w1_handle)      /* Test for window 1 handle */
                {          /* AES redraw example          */
                    objc_draw(w1_tree, ROOT, MAX_DEPTH, box.g_x,
                          box.g_y, box.g_w, box.g_h);
                }
                else if (wh == w2_handle) /* Test for window 2 handle */
                {          /* VDI redraw example          */
                    set_clip(TRUE, &box);
                    /*  Put VDI drawing calls here */
                }
                /* add more windows here */
            }
        wind_get(wh, WF_NEXTXYWH, &box.g_x, &box.g_y, &box.g_w,
             &box.g_h);
    }

    wind_update(END_UPDATE);
    graf_mouse(M_ON, 0x0L);
}


/* >>>>>>>>>>>>>>>>>>>>>>>> Utilities used in do_redraw <<<<<<<<<<<<<<<<<<<< */

VOID
set_clip(clip_flag, area)    /* set clip to specified area    */
WORD    clip_flag;
GRECT    *area;
{
    WORD    pxy[4];

    grect_to_array(area, pxy);
    vs_clip(vdi_handle, clip_flag, pxy);
}

VOID
grect_to_array(area, array)    /* convert x,y,w,h to upr lt x,y and    */
GRECT    *area;        /*              lwr rt x,y    */
WORD    *array;
{
    *array++ = area->g_x;
    *array++ = area->g_y;
    *array++ = area->g_x + area->g_w - 1;
    *array = area->g_y + area->g_h - 1;
}

WORD
rc_intersect(p1, p2)        /* compute intersect of two rectangles    */
GRECT    *p1, *p2;
{
    WORD    tx, ty, tw, th;

    tw = min(p2->g_x + p2->g_w, p1->g_x + p1->g_w);
    th = min(p2->g_y + p2->g_h, p1->g_y + p1->g_h);
    tx = max(p2->g_x, p1->g_x);
    ty = max(p2->g_y, p1->g_y);
    p2->g_x = tx;
    p2->g_y = ty;
    p2->g_w = tw - tx;
    p2->g_h = th - ty;
    return( (tw > tx) && (th > ty) );
}

/* >>>>>>>>>>>>>>>>>>>>>>> "Self-redraw" Utility <<<<<<<<<<<<<<<<<<<<<<<<< */

VOID
send_redraw(wh, p)
WORD    wh;
GRECT    *p;
{
    WORD    msg[8];

    msg[0] = WM_REDRAW;        /* Defined in GEMBIND.H        */
    msg[1] = gl_apid;        /* As returned by appl_init */
    msg[2] = 0;
    msg[3] = wh;            /* Handle of window to redraw */
    msg[4] = p->g_x;
    msg[5] = p->g_y;
    msg[6] = p->g_w;
    msg[7] = p->g_h;
    appl_write(gl_apid, 16, &msg);    /* Use ADDR(msg) for portability */
}

/* >>>>>>>>>>>>>>>>>>>> Utilities for Window Requests <<<<<<<<<<<<<<<<<< */

VOID
rc_constrain(pc, pt)
GRECT        *pc;
GRECT        *pt;
{
    if (pt->g_x < pc->g_x)
        pt->g_x = pc->g_x;
    if (pt->g_y < pc->g_y)
        pt->g_y = pc->g_y;
    if ((pt->g_x + pt->g_w) > (pc->g_x + pc->g_w))
        pt->g_x = (pc->g_x + pc->g_w) - pt->g_w;
    if ((pt->g_y + pt->g_h) > (pc->g_y + pc->g_h))
        pt->g_y = (pc->g_y + pc->g_h) - pt->g_h;
}

WORD
align(x,n)        /* Snap position x to an n-bit grid         */
WORD     x, n;   /* Use n = 16 for horizontal word alignment */
{
    x += (n >> 2) - 1;        /* Round and... */
    x = n * (x / n);        /* remove residue */
    return (x);
}

/* >>>>>>>>>>>>>>>>>>>>>>> Window full utility <<<<<<<<<<<<<<<<<<<<<<< */

VOID
hndl_full(wh)        /* depending on current window state, make window    */
WORD    wh;    /*   full size -or- return to previous shrunken size */
{        /* graf_ calls are optional special effects.         */
    GRECT    prev;
    GRECT    curr;
    GRECT    full;

    wind_get(wh, WF_CXYWH, &curr.g_x, &curr.g_y, &curr.g_w, &curr.g_h);
    wind_get(wh, WF_PXYWH, &prev.g_x, &prev.g_y, &prev.g_w, &prev.g_h);
    wind_get(wh, WF_FXYWH, &full.g_x, &full.g_y, &full.g_w, &full.g_h);
    if ( rc_equal(&curr, &full) )
    {        /* Is full, change to previous         */
        graf_shrinkbox(prev.g_x, prev.g_y, prev.g_w, prev.g_h,
                   full.g_x, full.g_y, full.g_w, full.g_h);
        wind_set(wh, WF_CXYWH, prev.g_x, prev.g_y, prev.g_w, prev.g_h);
        /* put send_redraw here if you need it */
    }
    else
    {        /* is not full, so set to full        */
        graf_growbox(curr.g_x, curr.g_y, curr.g_w, curr.g_h,
                 full.g_x, full.g_y, full.g_w, full.g_h);
        wind_set(wh, WF_CXYWH, full.g_x, full.g_y, full.g_w, full.g_h);
    }
}

WORD
rc_equal(p1, p2)        /* tests for two rectangles equal    */
GRECT    *p1, *p2;
{
    if ((p1->g_x != p2->g_x) ||
        (p1->g_y != p2->g_y) ||
        (p1->g_w != p2->g_w) ||
        (p1->g_h != p2->g_h))
        return(FALSE);
    return(TRUE);
}