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Code

The top face can now be shifted.

Browse Source 
- solidify/overlap.c (scroll_event): use center of canvas as center, not
  center of the top face
- solidify/overlap.c (do_shift, shift, scroll_event): added translation
  (shifting)
This commit is contained in:
Werner Almesberger 2010-09-24 01:11:57 -03:00
parent 525e1557ec
commit d49f349fa0
1 changed files with 31 additions and 5 deletions
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36
solidify/overlap.c
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@ -180,25 +180,51 @@ static void rotate(struct matrix *m, double r)
}
static void do_shift(struct matrix *m, int dx, int dy)
{
m->b[0] -= dx;
m->b[1] += dy;
}
static void shift(struct matrix *m, int dx, int dy, int dir)
{
if (dx > 0 && dy < dx && dy > -dx)
do_shift(m, dir, 0);
if (dx < 0 && dy < -dx && dy > dx)
do_shift(m, -dir, 0);
if (dy > 0 && dx < dy && dx > -dy)
do_shift(m, 0, dir);
if (dy < 0 && dx < -dy && dx > dy)
do_shift(m, 0, -dir);
}
static gboolean scroll_event(GtkWidget *widget, GdkEventScroll *event,
gpointer data)
{
GtkWidget *da = gtk_bin_get_child(GTK_BIN(widget));
struct solid *s = data;
struct face *f = s->a;
int dx = event->x-f->sx/2;
int dy = event->y-f->sy/2;
int dx = event->x-sx(s)/2;
int dy = event->y-sy(s)/2;
double r = hypot(dx, dy);
int center = r/hypot(sx(s), sy(s)) < 0.25;
if (r < 1)
return TRUE;
switch (event->direction) {
case GDK_SCROLL_UP:
rotate(&f->m, r);
if (center)
shift(&s->a->m, dx, dy, 1);
else
rotate(&s->a->m, r);
draw_image(da, s);
break;
case GDK_SCROLL_DOWN:
rotate(&f->m, -r);
if (center)
shift(&s->a->m, dx, dy, -1);
else
rotate(&s->a->m, -r);
draw_image(da, s);
break;
default: