ENTRYPOINT Bool
hop_handle_event (ModeInfo *mi, XEvent *event)
{
if (screenhack_event_helper (MI_DISPLAY(mi), MI_WINDOW(mi), event))
{
MI_CLEARWINDOW(mi);
init_hop (mi);
return True;
}
return False;
}
ENTRYPOINT void
draw_hop(ModeInfo * mi)
{
double oldj, oldi;
XPoint *xp;
int k;
hopstruct *hp;
if (hops == NULL)
return;
hp = &hops[MI_SCREEN(mi)];
#ifdef STANDALONE
if (hp->eraser) {
hp->eraser = erase_window (MI_DISPLAY(mi), MI_WINDOW(mi), hp->eraser);
return;
}
#endif
if (hp->pointBuffer == NULL)
return;
xp = hp->pointBuffer;
k = hp->bufsize;
MI_IS_DRAWN(mi) = True;
hp->inc++;
if (MI_NPIXELS(mi) > 2) {
XSetForeground(MI_DISPLAY(mi), MI_GC(mi), MI_PIXEL(mi, hp->pix));
if (++hp->pix >= MI_NPIXELS(mi))
hp->pix = 0;
}
while (k--) {
oldj = hp->j;
switch (hp->op) {
case MARTIN: /* SQRT, MARTIN1 */
oldi = hp->i + hp->inc;
hp->j = hp->a - hp->i;
hp->i = oldj + ((hp->i < 0)
? sqrt(fabs(hp->b * oldi - hp->c))
: -sqrt(fabs(hp->b * oldi - hp->c)));
xp->x = hp->centerx + (int) (hp->i + hp->j);
xp->y = hp->centery - (int) (hp->i - hp->j);
break;
case EJK1:
oldi = hp->i + hp->inc;
hp->j = hp->a - hp->i;
hp->i = oldj - ((hp->i > 0) ? (hp->b * oldi - hp->c) :
-(hp->b * oldi - hp->c));
xp->x = hp->centerx + (int) (hp->i + hp->j);
xp->y = hp->centery - (int) (hp->i - hp->j);
break;
case EJK2:
oldi = hp->i + hp->inc;
hp->j = hp->a - hp->i;
hp->i = oldj - ((hp->i < 0) ? log(fabs(hp->b * oldi - hp->c)) :
-log(fabs(hp->b * oldi - hp->c)));
xp->x = hp->centerx + (int) (hp->i + hp->j);
xp->y = hp->centery - (int) (hp->i - hp->j);
break;
case EJK3:
oldi = hp->i + hp->inc;
hp->j = hp->a - hp->i;
hp->i = oldj - ((hp->i > 0) ? sin(hp->b * oldi) - hp->c :
-sin(hp->b * oldi) - hp->c);
xp->x = hp->centerx + (int) (hp->i + hp->j);
xp->y = hp->centery - (int) (hp->i - hp->j);
break;
case EJK4:
oldi = hp->i + hp->inc;
hp->j = hp->a - hp->i;
hp->i = oldj - ((hp->i > 0) ? sin(hp->b * oldi) - hp->c :
-sqrt(fabs(hp->b * oldi - hp->c)));
xp->x = hp->centerx + (int) (hp->i + hp->j);
xp->y = hp->centery - (int) (hp->i - hp->j);
break;
case EJK5:
oldi = hp->i + hp->inc;
hp->j = hp->a - hp->i;
hp->i = oldj - ((hp->i > 0) ? sin(hp->b * oldi) - hp->c :
-(hp->b * oldi - hp->c));
xp->x = hp->centerx + (int) (hp->i + hp->j);
xp->y = hp->centery - (int) (hp->i - hp->j);
break;
case EJK6:
oldi = hp->i + hp->inc;
hp->j = hp->a - hp->i;
hp->i = oldj - asin((hp->b * oldi) - (long) (hp->b * oldi));
xp->x = hp->centerx + (int) (hp->i + hp->j);
xp->y = hp->centery - (int) (hp->i - hp->j);
break;
case RR: /* RR1 */
oldi = hp->i + hp->inc;
hp->j = hp->a - hp->i;
hp->i = oldj - ((hp->i < 0) ? -pow(fabs(hp->b * oldi - hp->c), hp->d) :
pow(fabs(hp->b * oldi - hp->c), hp->d));
xp->x = hp->centerx + (int) (hp->i + hp->j);
xp->y = hp->centery - (int) (hp->i - hp->j);
break;
case POPCORN:
#define HVAL 0.05
#define INCVAL 50
{
double tempi, tempj;
if (hp->inc >= 100)
hp->inc = 0;
if (hp->inc == 0) {
if (hp->a++ >= INCVAL) {
hp->a = 0;
if (hp->b++ >= INCVAL)
hp->b = 0;
}
hp->i = (-hp->c * INCVAL / 2 + hp->c * hp->a) * M_PI / 180.0;
hp->j = (-hp->c * INCVAL / 2 + hp->c * hp->b) * M_PI / 180.0;
}
tempi = hp->i - HVAL * sin(hp->j + tan(3.0 * hp->j));
tempj = hp->j - HVAL * sin(hp->i + tan(3.0 * hp->i));
xp->x = hp->centerx + (int) (MI_WIDTH(mi) / 40 * tempi);
xp->y = hp->centery + (int) (MI_HEIGHT(mi) / 40 * tempj);
hp->i = tempi;
hp->j = tempj;
}
break;
case JONG:
if (hp->centerx > 0)
oldi = hp->i + 4 * hp->inc / hp->centerx;
else
oldi = hp->i;
hp->j = sin(hp->c * hp->i) - cos(hp->d * hp->j);
hp->i = sin(hp->a * oldj) - cos(hp->b * oldi);
xp->x = hp->centerx + (int) (hp->centerx * (hp->i + hp->j) / 4.0);
xp->y = hp->centery - (int) (hp->centery * (hp->i - hp->j) / 4.0);
break;
case SINE: /* MARTIN2 */
oldi = hp->i + hp->inc;
hp->j = hp->a - hp->i;
hp->i = oldj - sin(oldi);
xp->x = hp->centerx + (int) (hp->i + hp->j);
xp->y = hp->centery - (int) (hp->i - hp->j);
break;
}
xp++;
}
XDrawPoints(MI_DISPLAY(mi), MI_WINDOW(mi), MI_GC(mi),
hp->pointBuffer, hp->bufsize, CoordModeOrigin);
if (++hp->count > MI_CYCLES(mi)) {
#ifdef STANDALONE
hp->eraser = erase_window (MI_DISPLAY(mi), MI_WINDOW(mi), hp->eraser);
#endif /* STANDALONE */
init_hop(mi);
}
}
