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GEMCL2.C
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1987-10-05
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>>>>>>>>>>>>>>>>>>>>>>>>>> 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);
}