/*! \brief rotate a net object around a centerpoint
* \par Function Description
* This function rotates a net \a object around the point
* (\a world_centerx, \a world_centery).
*
* \param [in] toplevel The TOPLEVEL object
* \param [in] world_centerx x-coord of the rotation center
* \param [in] world_centery y-coord of the rotation center
* \param [in] angle The angle to rotat the net object
* \param [in] object The net object
* \note only steps of 90 degrees are allowed for the \a angle
*/
void o_net_rotate_world(TOPLEVEL *toplevel,
int world_centerx, int world_centery, int angle,
OBJECT *object)
{
int newx, newy;
if (angle == 0)
return;
/* translate object to origin */
o_net_translate_world(toplevel, -world_centerx, -world_centery,
object);
rotate_point_90(object->line->x[0], object->line->y[0], angle,
&newx, &newy);
object->line->x[0] = newx;
object->line->y[0] = newy;
rotate_point_90(object->line->x[1], object->line->y[1], angle,
&newx, &newy);
object->line->x[1] = newx;
object->line->y[1] = newy;
o_net_translate_world(toplevel, world_centerx, world_centery, object);
}
/*! \brief Rotate BOX OBJECT using WORLD coordinates.
* \par Function Description
* The function #o_box_rotate_world() rotate the box described by
* <B>*object</B> around the (<B>world_centerx</B>, <B>world_centery</B>) point by
* <B>angle</B> degrees.
* The center of rotation is in world unit.
*
* \param [in] toplevel The TOPLEVEL object.
* \param [in] world_centerx Rotation center x coordinate in WORLD units.
* \param [in] world_centery Rotation center y coordinate in WORLD units.
* \param [in] angle Rotation angle in degrees (See note below).
* \param [in,out] object BOX OBJECT to rotate.
*
*/
void o_box_rotate_world(TOPLEVEL *toplevel,
int world_centerx, int world_centery, int angle,
OBJECT *object)
{
int newx1, newy1;
int newx2, newy2;
/*! \note
* Only 90 degree multiple and positive angles are allowed.
*/
/* angle must be positive */
if(angle < 0) angle = -angle;
/* angle must be a 90 multiple or no rotation performed */
if((angle % 90) != 0) return;
/*! \note
* The center of rotation (<B>world_centerx</B>, <B>world_centery</B>) is
* translated to the origin. The rotation of the upper left and lower right
* corner are then performed. Finally, the rotated box is translated back
* to its previous location.
*/
/* translate object to origin */
object->box->upper_x -= world_centerx;
object->box->upper_y -= world_centery;
object->box->lower_x -= world_centerx;
object->box->lower_y -= world_centery;
/* rotate the upper left corner of the box */
rotate_point_90(object->box->upper_x, object->box->upper_y, angle,
&newx1, &newy1);
/* rotate the lower left corner of the box */
rotate_point_90(object->box->lower_x, object->box->lower_y, angle,
&newx2, &newy2);
/* reorder the corners after rotation */
object->box->upper_x = min(newx1,newx2);
object->box->upper_y = max(newy1,newy2);
object->box->lower_x = max(newx1,newx2);
object->box->lower_y = min(newy1,newy2);
/* translate object back to normal position */
object->box->upper_x += world_centerx;
object->box->upper_y += world_centery;
object->box->lower_x += world_centerx;
object->box->lower_y += world_centery;
/* recalc boundings and world coords */
o_box_recalc(toplevel, object);
}
/*! \todo Finish function documentation!!!
* \brief
* \par Function Description
*
*/
void o_complex_rotate_world(TOPLEVEL *toplevel,
int centerx, int centery,
int angle, OBJECT *object)
{
int x, y;
int newx, newy;
g_return_if_fail (object!=NULL);
g_return_if_fail ((object->type == OBJ_COMPLEX) ||
(object->type == OBJ_PLACEHOLDER));
x = object->complex->x + (-centerx);
y = object->complex->y + (-centery);
rotate_point_90(x, y, angle, &newx, &newy);
x = newx + (centerx);
y = newy + (centery);
o_complex_translate_world(toplevel,
-object->complex->x,
-object->complex->y, object);
o_glist_rotate_world (toplevel, 0, 0, angle, object->complex->prim_objs);
object->complex->x = 0;
object->complex->y = 0;
o_complex_translate_world(toplevel, x, y, object);
object->complex->angle = ( object->complex->angle + angle ) % 360;
}
/*! \brief
* \par Function Description
* This function rotates the world coordinates of an arc of an angle
* specified by <B>angle</B>. The center of the rotation is given by
* (<B>world_centerx</B>,<B>world_centery</B>).
*
* The arc is translated in order to put the center of the rotation
* on the origin. The center of the arc is then rotated of the angle
* specified by <B>angle</B>. The start angle of the arc is incremented by <B>angle</B>.
*
* The arc is finally back translated to its previous location on the page.
*
* <B>world_centerx</B> and <B>world_centery</B> are in world units, <B>angle</B> is in degrees.
*
* \param [in] toplevel The TOPLEVEL object.
* \param [in] world_centerx
* \param [in] world_centery
* \param [in] angle
* \param [in] object
*/
void o_arc_rotate_world(TOPLEVEL *toplevel,
int world_centerx, int world_centery, int angle,
OBJECT *object)
{
int x, y, newx, newy;
/* translate object to origin */
object->arc->x -= world_centerx;
object->arc->y -= world_centery;
/* get center, and rotate center */
x = object->arc->x;
y = object->arc->y;
if(angle % 90 == 0) {
rotate_point_90(x, y, angle % 360, &newx, &newy);
} else {
rotate_point(x, y, angle % 360, &newx, &newy);
}
object->arc->x = newx;
object->arc->y = newy;
/* apply rotation to angles */
object->arc->start_angle = (object->arc->start_angle + angle) % 360;
/* end_angle is unchanged as it is the sweep of the arc */
/* object->arc->end_angle = (object->arc->end_angle); */
/* translate object to its previous place */
object->arc->x += world_centerx;
object->arc->y += world_centery;
/* update the screen coords and the bounding box */
o_arc_recalc(toplevel, object);
}
/*! \brief Rotate Line OBJECT using WORLD coordinates.
* \par Function Description
* This function rotates the line described by
* <B>*object</B> around the (<B>world_centerx</B>,<B>world_centery</B>)
* point by <B>angle</B> degrees.
* The center of rotation is in world units.
*
* \param [in] toplevel The TOPLEVEL object.
* \param [in] world_centerx Rotation center x coordinate in WORLD units.
* \param [in] world_centery Rotation center y coordinate in WORLD units.
* \param [in] angle Rotation angle in degrees (See note below).
* \param [in,out] object Line OBJECT to rotate.
*/
void o_line_rotate_world(TOPLEVEL *toplevel,
int world_centerx, int world_centery, int angle,
OBJECT *object)
{
int newx, newy;
if (angle == 0)
return;
/* angle must be positive */
if(angle < 0) angle = -angle;
/* angle must be 90 multiple or no rotation performed */
if((angle % 90) != 0) return;
/*
* The center of rotation (<B>world_centerx</B>,<B>world_centery</B>)
* is translated to the origin. The rotation of the two ends of
* the line is performed. FInally, the rotated line is translated
* back to its previous location.
*/
/* translate object to origin */
o_line_translate_world(toplevel, -world_centerx, -world_centery, object);
/* rotate line end 1 */
rotate_point_90(object->line->x[0], object->line->y[0], angle,
&newx, &newy);
object->line->x[0] = newx;
object->line->y[0] = newy;
/* rotate line end 2 */
rotate_point_90(object->line->x[1], object->line->y[1], angle,
&newx, &newy);
object->line->x[1] = newx;
object->line->y[1] = newy;
/* translate object back to normal position */
o_line_translate_world(toplevel, world_centerx, world_centery, object);
}
/*! \brief Rotate Circle OBJECT using WORLD coordinates.
* \par Function Description
* The function #o_circle_rotate_world() rotate the circle described by
* <B>*object</B> around the (<B>world_centerx</B>,<B>world_centery</B>) point by
* angle <B>angle</B> degrees.
* The center of rotation is in world unit.
*
* \param [in] toplevel The TOPLEVEL object.
* \param [in] world_centerx Rotation center x coordinate in WORLD units.
* \param [in] world_centery Rotation center y coordinate in WORLD units.
* \param [in] angle Rotation angle in degrees (See note below).
* \param [in,out] object Circle OBJECT to rotate.
*/
void o_circle_rotate_world(TOPLEVEL *toplevel,
int world_centerx, int world_centery, int angle,
OBJECT *object)
{
int newx, newy;
int x, y;
/* Only 90 degree multiple and positive angles are allowed. */
/* angle must be positive */
if(angle < 0) angle = -angle;
/* angle must be a 90 multiple or no rotation performed */
if((angle % 90) != 0) return;
/*
* The center of rotation (<B>world_centerx</B>,<B>world_centery</B>) is
* translated to the origin. The rotation of the center around the origin
* is then performed. Finally, the rotated circle is translated back to
* its previous location.
*/
/* translate object to origin */
object->circle->center_x -= world_centerx;
object->circle->center_y -= world_centery;
/* rotate the center of the circle around the origin */
x = object->circle->center_x;
y = object->circle->center_y;
rotate_point_90(x, y, angle, &newx, &newy);
object->circle->center_x = newx;
object->circle->center_y = newy;
/* translate back in position */
object->circle->center_x += world_centerx;
object->circle->center_y += world_centery;
o_circle_recalc(toplevel, object);
}
