static void
d_draw_line (GfigObject *obj,
cairo_t *cr)
{
DobjPoints *spnt;
DobjPoints *epnt;
spnt = obj->points;
if (!spnt)
return; /* End-of-line */
epnt = spnt->next;
while (spnt && epnt)
{
draw_sqr (&spnt->pnt, obj == gfig_context->selected_obj, cr);
/* Go around all the points drawing a line from one to the next */
gfig_draw_line (spnt->pnt.x, spnt->pnt.y, epnt->pnt.x, epnt->pnt.y, cr);
spnt = epnt;
epnt = epnt->next;
}
if (obj_creating == obj)
draw_circle (&spnt->pnt, TRUE, cr);
else
draw_sqr (&spnt->pnt, obj == gfig_context->selected_obj, cr);
}
static void
d_draw_spiral (GfigObject *obj)
{
DobjPoints *center_pnt;
DobjPoints *radius_pnt;
gint16 shift_x;
gint16 shift_y;
gdouble ang_grid;
gdouble ang_loop;
gdouble radius;
gdouble offset_angle;
gdouble sp_cons;
gint loop;
GdkPoint start_pnt = { 0, 0 };
GdkPoint first_pnt;
gboolean do_line = FALSE;
gint clock_wise = 1;
center_pnt = obj->points;
if (!center_pnt)
return; /* End-of-line */
/* First point is the center */
/* Just draw a control point around it */
draw_sqr (¢er_pnt->pnt, obj == gfig_context->selected_obj);
/* Next point defines the radius */
radius_pnt = center_pnt->next; /* this defines the vetices */
if (!radius_pnt)
{
#ifdef DEBUG
g_warning ("Internal error in spiral - no vertice point \n");
#endif /* DEBUG */
return;
}
/* Other control point */
draw_sqr (&radius_pnt->pnt, obj == gfig_context->selected_obj);
/* Have center and radius - draw spiral */
shift_x = radius_pnt->pnt.x - center_pnt->pnt.x;
shift_y = radius_pnt->pnt.y - center_pnt->pnt.y;
radius = sqrt ((shift_x * shift_x) + (shift_y * shift_y));
offset_angle = atan2 (shift_y, shift_x);
clock_wise = obj->type_data / abs (obj->type_data);
if (offset_angle < 0)
offset_angle += 2.0 * G_PI;
sp_cons = radius/(obj->type_data * 2 * G_PI + offset_angle);
/* Lines */
ang_grid = 2.0 * G_PI / 180.0;
for (loop = 0 ; loop <= abs (obj->type_data * 180) +
clock_wise * (gint)RINT (offset_angle/ang_grid) ; loop++)
{
gdouble lx, ly;
GdkPoint calc_pnt;
ang_loop = (gdouble)loop * ang_grid;
lx = sp_cons * ang_loop * cos (ang_loop)*clock_wise;
ly = sp_cons * ang_loop * sin (ang_loop);
calc_pnt.x = RINT (lx + center_pnt->pnt.x);
calc_pnt.y = RINT (ly + center_pnt->pnt.y);
if (do_line)
{
/* Miss out points that come to the same location */
if (calc_pnt.x == start_pnt.x && calc_pnt.y == start_pnt.y)
continue;
gfig_draw_line (calc_pnt.x, calc_pnt.y, start_pnt.x, start_pnt.y);
}
else
{
do_line = TRUE;
first_pnt = calc_pnt;
}
start_pnt = calc_pnt;
}
}
static void
d_draw_star (GfigObject *obj,
cairo_t *cr)
{
DobjPoints *center_pnt;
DobjPoints *outer_radius_pnt;
DobjPoints *inner_radius_pnt;
gint16 shift_x;
gint16 shift_y;
gdouble ang_grid;
gdouble ang_loop;
gdouble outer_radius;
gdouble inner_radius;
gdouble offset_angle;
gint loop;
GdkPoint start_pnt = { 0, 0 };
GdkPoint first_pnt = { 0, 0 };
gboolean do_line = FALSE;
center_pnt = obj->points;
if (!center_pnt)
return; /* End-of-line */
/* First point is the center */
/* Just draw a control point around it */
draw_sqr (¢er_pnt->pnt, obj == gfig_context->selected_obj, cr);
/* Next point defines the radius */
outer_radius_pnt = center_pnt->next; /* this defines the vertices */
if (!outer_radius_pnt)
{
return;
}
inner_radius_pnt = outer_radius_pnt->next; /* this defines the vertices */
if (!inner_radius_pnt)
{
return;
}
/* Other control points */
if (obj == obj_creating)
{
draw_circle (&outer_radius_pnt->pnt, TRUE, cr);
draw_circle (&inner_radius_pnt->pnt, TRUE, cr);
}
else
{
draw_sqr (&outer_radius_pnt->pnt, obj == gfig_context->selected_obj, cr);
draw_sqr (&inner_radius_pnt->pnt, obj == gfig_context->selected_obj, cr);
}
/* Have center and radius - draw star */
shift_x = outer_radius_pnt->pnt.x - center_pnt->pnt.x;
shift_y = outer_radius_pnt->pnt.y - center_pnt->pnt.y;
outer_radius = sqrt ((shift_x*shift_x) + (shift_y*shift_y));
/* Lines */
ang_grid = 2.0 * G_PI / (2.0 * (gdouble) obj->type_data);
offset_angle = atan2 (shift_y, shift_x);
shift_x = inner_radius_pnt->pnt.x - center_pnt->pnt.x;
shift_y = inner_radius_pnt->pnt.y - center_pnt->pnt.y;
inner_radius = sqrt ((shift_x*shift_x) + (shift_y*shift_y));
for (loop = 0 ; loop < 2 * obj->type_data ; loop++)
{
gdouble lx, ly;
GdkPoint calc_pnt;
ang_loop = (gdouble)loop * ang_grid + offset_angle;
if (loop % 2)
{
lx = inner_radius * cos (ang_loop);
ly = inner_radius * sin (ang_loop);
}
else
{
lx = outer_radius * cos (ang_loop);
ly = outer_radius * sin (ang_loop);
}
calc_pnt.x = RINT (lx + center_pnt->pnt.x);
calc_pnt.y = RINT (ly + center_pnt->pnt.y);
if (do_line)
{
/* Miss out points that come to the same location */
if (calc_pnt.x == start_pnt.x && calc_pnt.y == start_pnt.y)
continue;
gfig_draw_line (calc_pnt.x, calc_pnt.y, start_pnt.x, start_pnt.y, cr);
}
else
{
do_line = TRUE;
first_pnt = calc_pnt;
}
start_pnt = calc_pnt;
}
gfig_draw_line (first_pnt.x, first_pnt.y, start_pnt.x, start_pnt.y, cr);
}
