static BezPoint *transform_spline(int npoints, Point *points, gboolean closed) {
BezPoint *bezpoints = g_new(BezPoint, npoints);
int i;
Point vector;
for (i = 0; i < npoints; i++) {
bezpoints[i].p3 = points[i];
bezpoints[i].type = BEZ_CURVE_TO;
}
bezpoints[0].type = BEZ_MOVE_TO;
bezpoints[0].p1 = points[0];
for (i = 1; i < npoints-1; i++) {
bezpoints[i].p2 = points[i];
bezpoints[i+1].p1 = points[i];
vector = points[i-1];
point_sub(&vector, &points[i+1]);
point_scale(&vector, -TENSION);
point_sub(&bezpoints[i].p2, &vector);
point_add(&bezpoints[i+1].p1, &vector);
}
if (closed) {
bezpoints[npoints-1].p2 = points[i];
bezpoints[1].p1 = points[i];
vector = points[npoints-2];
point_sub(&vector, &points[1]);
point_scale(&vector, -TENSION);
point_sub(&bezpoints[npoints-1].p2, &vector);
point_add(&bezpoints[1].p1, &vector);
} else {
bezpoints[1].p1 = points[0];
bezpoints[npoints-1].p2 = bezpoints[npoints-1].p3;
}
return bezpoints;
}
static void draw_dot(DiaRenderer *renderer,
Point *end, Point *vect, Color *col)
{
DiaRendererClass *renderer_ops = DIA_RENDERER_GET_CLASS (renderer);
Point vv,vp,vt,pt;
real vlen;
vv = *end;
point_sub(&vv,vect);
vlen = distance_point_point(vect,end);
if (vlen < 1E-7) return;
point_scale(&vv,1/vlen);
vp.y = vv.x;
vp.x = -vv.y;
pt = *end;
vt = vp;
point_scale(&vt,ARROW_DOT_WOFFSET);
point_add(&pt,&vt);
vt = vv;
point_scale(&vt,-ARROW_DOT_LOFFSET);
point_add(&pt,&vt);
renderer_ops->set_fillstyle(renderer,FILLSTYLE_SOLID);
renderer_ops->fill_ellipse(renderer,&pt,
ARROW_DOT_RADIUS,ARROW_DOT_RADIUS,
col);
}
static void
implements_update_data(Implements *implements)
{
Connection *conn = &implements->connection;
Object *obj = (Object *) implements;
Point delta;
Point point;
real len;
Rectangle rect;
obj->position = conn->endpoints[0];
implements->text_handle.pos = implements->text_pos;
/* circle handle/center pos: */
delta = conn->endpoints[0];
point_sub(&delta, &conn->endpoints[1]);
len = sqrt(point_dot(&delta, &delta));
delta.x /= len; delta.y /= len;
point = delta;
point_scale(&point, implements->circle_diameter);
point_add(&point, &conn->endpoints[1]);
implements->circle_handle.pos = point;
point = delta;
point_scale(&point, implements->circle_diameter/2.0);
point_add(&point, &conn->endpoints[1]);
implements->circle_center = point;
connection_update_handles(conn);
/* Boundingbox: */
connection_update_boundingbox(conn);
/* Add boundingbox for circle: */
rect.left = implements->circle_center.x - implements->circle_diameter/2.0;
rect.right = implements->circle_center.x + implements->circle_diameter/2.0;
rect.top = implements->circle_center.y - implements->circle_diameter/2.0;
rect.bottom = implements->circle_center.y + implements->circle_diameter/2.0;
rectangle_union(&obj->bounding_box, &rect);
/* Add boundingbox for text: */
rect.left = implements->text_pos.x;
rect.right = rect.left + implements->text_width;
rect.top = implements->text_pos.y - font_ascent(implements_font, IMPLEMENTS_FONTHEIGHT);
rect.bottom = rect.top + IMPLEMENTS_FONTHEIGHT;
rectangle_union(&obj->bounding_box, &rect);
/* fix boundingbox for implements_width: */
obj->bounding_box.top -= IMPLEMENTS_WIDTH/2;
obj->bounding_box.left -= IMPLEMENTS_WIDTH/2;
obj->bounding_box.bottom += IMPLEMENTS_WIDTH/2;
obj->bounding_box.right += IMPLEMENTS_WIDTH/2;
}
static void
rendobj_update_data(RenderObject *rend_obj)
{
Point p;
const RenderObjectDescriptor *desc;
Element *elem;
Object *obj;
int i;
elem = &rend_obj->element;
obj = &elem->object;
desc = rend_obj->desc;
rend_obj->magnify = elem->width / rend_obj->desc->width;
/* Update connections: */
for (i=0;i<desc->num_connection_points;i++) {
rend_obj->connections[i].pos = desc->connection_points[i];
point_scale(&rend_obj->connections[i].pos, rend_obj->magnify);
point_add(&rend_obj->connections[i].pos, &elem->corner);
}
if (desc->use_text) {
p = desc->text_pos;
point_scale(&p, rend_obj->magnify);
point_add(&p, &elem->corner);
p.y += rend_obj->text->ascent;
text_set_position(rend_obj->text, &p);
}
element_update_boundingbox(elem);
/* fix boundingbox for extra_border: */
obj->bounding_box.top -= desc->extra_border;
obj->bounding_box.left -= desc->extra_border;
obj->bounding_box.bottom += desc->extra_border;
obj->bounding_box.right += desc->extra_border;
if (desc->use_text) {
Rectangle text_box;
text_calc_boundingbox(rend_obj->text, &text_box);
rectangle_union(&obj->bounding_box, &text_box);
}
obj->position = elem->corner;
p = desc->move_position;
point_scale(&p, rend_obj->magnify);
point_add(&obj->position, &p);
element_update_handles(elem);
}
static void
annotation_draw(Annotation *annotation, DiaRenderer *renderer)
{
Point *endpoints;
Point vect,rvect,v1,v2;
Point pts[4];
real vlen;
DiaRendererClass *renderer_ops = DIA_RENDERER_GET_CLASS (renderer);
assert(annotation != NULL);
assert(renderer != NULL);
endpoints = &annotation->connection.endpoints[0];
renderer_ops->set_linewidth(renderer, ANNOTATION_LINE_WIDTH);
renderer_ops->set_linestyle(renderer, LINESTYLE_SOLID);
renderer_ops->set_linecaps(renderer, LINECAPS_BUTT);
vect = annotation->connection.endpoints[1];
point_sub(&vect,&annotation->connection.endpoints[0]);
vlen = distance_point_point(&annotation->connection.endpoints[0],
&annotation->connection.endpoints[1]);
if (vlen > 0.0) {
/* draw the squiggle */
point_scale(&vect,1/vlen);
rvect.y = vect.x;
rvect.x = -vect.y;
pts[0] = annotation->connection.endpoints[0];
pts[1] = annotation->connection.endpoints[0];
v1 = vect;
point_scale(&v1,.5*vlen);
point_add(&pts[1],&v1);
pts[2] = pts[1];
/* pts[1] and pts[2] are currently both at the middle of (pts[0],pts[3]) */
v1 = vect;
point_scale(&v1,ANNOTATION_ZLEN);
v2 = rvect;
point_scale(&v2,ANNOTATION_ZLEN);
point_sub(&v1,&v2);
point_add(&pts[1],&v1);
point_sub(&pts[2],&v1);
pts[3] = annotation->connection.endpoints[1];
renderer_ops->draw_polyline(renderer,
pts, sizeof(pts) / sizeof(pts[0]),
&color_black);
}
text_draw(annotation->text,renderer);
}
static ObjectChange*
bezierline_move_handle(Bezierline *bezierline, Handle *handle,
Point *to, ConnectionPoint *cp,
HandleMoveReason reason, ModifierKeys modifiers)
{
assert(bezierline!=NULL);
assert(handle!=NULL);
assert(to!=NULL);
if (reason == HANDLE_MOVE_CREATE || reason == HANDLE_MOVE_CREATE_FINAL) {
/* During creation, change the control points */
BezierConn *bez = &bezierline->bez;
Point dist = bez->bezier.points[0].p1;
point_sub(&dist, to);
dist.y = 0;
point_scale(&dist, 0.332);
bezierconn_move_handle(bez, handle, to, cp, reason, modifiers);
bez->bezier.points[1].p1 = bez->bezier.points[0].p1;
point_sub(&bez->bezier.points[1].p1, &dist);
bez->bezier.points[1].p2 = *to;
point_add(&bez->bezier.points[1].p2, &dist);
} else {
bezierconn_move_handle(&bezierline->bez, handle, to, cp, reason, modifiers);
}
bezierline_update_data(bezierline);
return NULL;
}
static void draw_tunnel(DiaRenderer *renderer,
Point *end, Point *vect, Color *col)
{
DiaRendererClass *renderer_ops = DIA_RENDERER_GET_CLASS (renderer);
Point vv,vp,vt1,vt2;
BezPoint curve1[2];
BezPoint curve2[2];
real vlen;
vv = *end;
point_sub(&vv,vect);
vlen = distance_point_point(vect,end);
if (vlen < 1E-7) return;
point_scale(&vv,1/vlen);
vp.y = vv.x;
vp.x = -vv.y;
curve1[0].type = curve2[0].type = BEZ_MOVE_TO;
curve1[0].p1 = curve2[0].p1 = *end;
vt1 = vv;
point_scale(&vt1,-ARROW_PARENS_LOFFSET - (.5*ARROW_PARENS_LENGTH));
point_add(&curve1[0].p1,&vt1); point_add(&curve2[0].p1,&vt1);
/* gcc, work for me, please. */
vt2 = vp;
point_scale(&vt2,ARROW_PARENS_WOFFSET);
point_add(&curve1[0].p1,&vt2); point_sub(&curve2[0].p1,&vt2);
vt2 = vp;
vt1 = vv;
point_scale(&vt1,2.0*ARROW_PARENS_LENGTH / 6.0);
point_scale(&vt2,ARROW_PARENS_LENGTH / 6.0);
curve1[1].type = curve2[1].type = BEZ_CURVE_TO;
curve1[1].p1 = curve1[0].p1; curve2[1].p1 = curve2[0].p1;
point_add(&curve1[1].p1,&vt1); point_add(&curve2[1].p1,&vt1);
point_add(&curve1[1].p1,&vt2); point_sub(&curve2[1].p1,&vt2);
curve1[1].p2 = curve1[1].p1; curve2[1].p2 = curve2[1].p1;
point_add(&curve1[1].p2,&vt1); point_add(&curve2[1].p2,&vt1);
curve1[1].p3 = curve1[1].p2; curve2[1].p3 = curve2[1].p2;
point_add(&curve1[1].p3,&vt1); point_add(&curve2[1].p3,&vt1);
point_sub(&curve1[1].p3,&vt2); point_add(&curve2[1].p3,&vt2);
renderer_ops->draw_bezier(renderer,curve1,2,col);
renderer_ops->draw_bezier(renderer,curve2,2,col);
}
void
point_convex(Point *dst, const Point *src1, const Point *src2, real alpha)
{
/* Make convex combination of src1 and src2:
dst = alpha * src1 + (1-alpha) * src2;
*/
point_copy(dst,src1);
point_scale(dst,alpha);
point_add_scaled(dst,src2,1.0 - alpha);
}
static void
scroll_motion(ScrollTool *tool, GdkEventMotion *event,
DDisplay *ddisp)
{
Point to;
Point delta;
/* set the cursor appropriately, and change use_hand if needed */
if (!tool->scrolling) {
/* try to minimise the number of cursor type changes */
if ((event->state & GDK_SHIFT_MASK) != 0) {
if (!tool->use_hand) {
tool->use_hand = TRUE;
if (!open_hand_cursor)
open_hand_cursor = create_cursor(ddisp->canvas->window,
hand_open_data_bits,
hand_open_data_width,
hand_open_data_height,
hand_open_mask_bits,
hand_open_data_width/2,
hand_open_data_height/2);
ddisplay_set_all_cursor(open_hand_cursor);
}
} else
if (tool->use_hand) {
tool->use_hand = FALSE;
ddisplay_set_all_cursor(scroll_cursor);
}
return;
}
ddisplay_untransform_coords(ddisp, event->x, event->y, &to.x, &to.y);
if (tool->use_hand) {
delta = tool->last_pos;
point_sub(&delta, &to);
tool->last_pos = to;
point_add(&tool->last_pos, &delta);
/* we use this so you can scroll past the edge of the image */
point_add(&delta, &ddisp->origo);
ddisplay_set_origo(ddisp, delta.x, delta.y);
ddisplay_update_scrollbars(ddisp);
ddisplay_add_update_all(ddisp);
} else {
delta = to;
point_sub(&delta, &tool->last_pos);
point_scale(&delta, 0.5);
ddisplay_scroll(ddisp, &delta);
tool->last_pos = to;
}
ddisplay_flush(ddisp);
}
/*!
* \brief Limit movability of control handles
*
* Update a corner to have less freedom in its control handles, arranging
* the control points at some reasonable places.
* @param bezier A bezierconn to straighten a corner of
* @param comp_nr The index into the corner_types array of the corner to
* straighten.
* \memberof _BezierConn
*/
static void
bezierconn_straighten_corner (BezierConn *bezier, int comp_nr)
{
int next_nr = comp_nr+1;
/* Neat thing would be to have the kind of straigthening depend on
which handle was chosen: Mid-handle does average, other leaves that
handle where it is. */
switch (bezier->bezier.corner_types[comp_nr]) {
case BEZ_CORNER_SYMMETRIC: {
Point pt1, pt2;
pt1 = bezier->bezier.points[comp_nr].p3;
point_sub(&pt1, &bezier->bezier.points[comp_nr].p2);
pt2 = bezier->bezier.points[comp_nr].p3;
point_sub(&pt2, &bezier->bezier.points[next_nr].p1);
point_scale(&pt2, -1.0);
point_add(&pt1, &pt2);
point_scale(&pt1, 0.5);
pt2 = pt1;
point_scale(&pt1, -1.0);
point_add(&pt1, &bezier->bezier.points[comp_nr].p3);
point_add(&pt2, &bezier->bezier.points[comp_nr].p3);
bezier->bezier.points[comp_nr].p2 = pt1;
bezier->bezier.points[next_nr].p1 = pt2;
bezierconn_update_data(bezier);
}
break;
case BEZ_CORNER_SMOOTH: {
Point pt1, pt2;
real len1, len2;
pt1 = bezier->bezier.points[comp_nr].p3;
point_sub(&pt1, &bezier->bezier.points[comp_nr].p2);
pt2 = bezier->bezier.points[comp_nr].p3;
point_sub(&pt2, &bezier->bezier.points[next_nr].p1);
len1 = point_len(&pt1);
len2 = point_len(&pt2);
point_scale(&pt2, -1.0);
if (len1 > 0)
point_normalize(&pt1);
if (len2 > 0)
point_normalize(&pt2);
point_add(&pt1, &pt2);
point_scale(&pt1, 0.5);
pt2 = pt1;
point_scale(&pt1, -len1);
point_add(&pt1, &bezier->bezier.points[comp_nr].p3);
point_scale(&pt2, len2);
point_add(&pt2, &bezier->bezier.points[comp_nr].p3);
bezier->bezier.points[comp_nr].p2 = pt1;
bezier->bezier.points[next_nr].p1 = pt2;
bezierconn_update_data(bezier);
}
break;
case BEZ_CORNER_CUSP:
break;
}
}
static point center_of_mass(unsigned n, point o[])
{
point com;
unsigned i;
unsigned long tn;
com = point_zero;
for (i = 0; i < n; ++i)
com = point_add(com, o[i]);
mpi_add_doubles(comm_mpi(), point_arr(&com), 3);
tn = mpi_add_ulong(comm_mpi(), n);
return point_scale(com, 1.0 / tn);
}
static void
rendobj_move(RenderObject *rend_obj, Point *to)
{
Point p;
p = rend_obj->desc->move_position;
rend_obj->element.corner = *to;
point_scale(&p, rend_obj->magnify);
point_sub(&rend_obj->element.corner,
&p);
rendobj_update_data(rend_obj);
}
/* finds the point intersecting the full circle
* on the vector defined by the center and Point *to
* that point is returned in Point *best if 1 is returned */
static int
arc_find_radial(const Arc *arc, const Point *to, Point *best)
{
Point tmp;
tmp = *to;
point_sub(&tmp, &arc->center);
point_normalize(&tmp);
point_scale(&tmp,arc->radius);
point_add(&tmp, &arc->center);
*best = tmp;
return 1;
}
/** rotates p around the center by an angle given in radians
* a positive angle is ccw on the screen*/
static void
rotate_point_around_point(Point *p, const Point *center, real angle)
{
real radius;
real a;
point_sub(p,center);
radius = point_len(p);
a = -atan2(p->y,p->x); /* y axis points down*/
a += angle;
p->x = cos(a); p->y = -sin(a);/* y axis points down*/
point_scale(p,radius);
point_add(p,center);
}
/*
* This function estimates the distance from a point to a line segment
* specified by two endpoints.
* If the point is on the line segment, 0.0 is returned. Otherwise the
* distance in the R^2 metric from the point to the nearest point
* on the line segment is returned. Does one sqrt per call.
* Philosophical bug: line_width is ignored iff point is beyond
* end of line segment.
*/
real
distance_line_point(Point *line_start, Point *line_end,
real line_width, Point *point)
{
Point v1, v2;
real v1_lensq;
real projlen;
real perp_dist;
v1 = *line_end;
point_sub(&v1,line_start);
v2 = *point;
point_sub(&v2, line_start);
v1_lensq = point_dot(&v1,&v1);
if (v1_lensq<0.000001) {
return sqrt(point_dot(&v2,&v2));
}
projlen = point_dot(&v1,&v2) / v1_lensq;
if (projlen<0.0) {
return sqrt(point_dot(&v2,&v2));
}
if (projlen>1.0) {
Point v3 = *point;
point_sub(&v3,line_end);
return sqrt(point_dot(&v3,&v3));
}
point_scale(&v1, projlen);
point_sub(&v1, &v2);
perp_dist = sqrt(point_dot(&v1,&v1));
perp_dist -= line_width / 2.0;
if (perp_dist < 0.0) {
perp_dist = 0.0;
}
return perp_dist;
}
/** Calculate the bounding box for a simple line.
* @param p1 One end of the line.
* @param p2 The other end of the line.
* @param extra Extra information
* @param rect The box that the line and extra stuff fits inside.
*/
void
line_bbox(const Point *p1, const Point *p2,
const LineBBExtras *extra,
Rectangle *rect)
{
Point vl;
rect->left = rect->right = p1->x;
rect->top = rect->bottom = p1->y;
rectangle_add_point(rect,p2); /* as a safety, so we don't need to care if it above or below p1 */
point_copy_add_scaled(&vl,p1,p2,-1);
point_normalize(&vl);
add_arrow_rectangle(rect,p1,&vl,extra->start_long,extra->start_trans);
point_scale(&vl,-1);
add_arrow_rectangle(rect,p2,&vl,extra->end_long,extra->end_trans);
}
void line_bbox(const Point *p1, const Point *p2,
const LineBBExtras *extra,
Rectangle *rect)
{
Point vl;
rect->setLeft(p1->x());
rect->setRight(p1->x());
rect->setTop(p1->y());
rect->setBottom(p1->y());
rectangle_add_point(rect,p2);
point_copy_add_scaled(&vl,p1,p2,-1);
point_normalize(&vl);
add_arrow_rectangle(rect,p1,&vl,extra->startLong,extra->startTrans);
point_scale(&vl,-1);
add_arrow_rectangle(rect,p2,&vl,extra->endLong,extra->endTrans);
}
void
connpointline_putonaline(ConnPointLine *cpl,Point *start,Point *end, gint dirs)
{
Point se_vector;
real se_len,pseudopoints;
int i;
GSList *elem;
point_copy(&se_vector, end);
point_sub(&se_vector, start);
se_len = point_len(&se_vector);
if (se_len > 0)
point_normalize(&se_vector);
cpl->start = *start;
cpl->end = *end;
if (dirs != DIR_NONE)
/* use the oone givne by the caller */;
else if (fabs(se_vector.x) > fabs(se_vector.y))
dirs = DIR_NORTH|DIR_SOUTH;
else
dirs = DIR_EAST|DIR_WEST;
pseudopoints = cpl->num_connections + 1; /* here, we count the start and end
points as eating real positions. */
for (i=0, elem=cpl->connections;
i<cpl->num_connections;
i++,elem=g_slist_next(elem)) {
ConnectionPoint *cp = (ConnectionPoint *)(elem->data);
cp->pos = se_vector;
cp->directions = dirs;
point_scale(&cp->pos,se_len * (i+1.0)/pseudopoints);
point_add(&cp->pos,start);
}
}
static void
bezierline_move_handle(Bezierline *bezierline, Handle *handle,
Point *to, HandleMoveReason reason, ModifierKeys modifiers)
{
assert(bezierline!=NULL);
assert(handle!=NULL);
assert(to!=NULL);
bezierconn_move_handle(&bezierline->bez, handle, to, reason);
if (reason == HANDLE_MOVE_CREATE || reason == HANDLE_MOVE_CREATE_FINAL) {
BezierConn *bez = &bezierline->bez;
Point delta = bez->points[1].p3;
point_sub(&delta, &bez->points[0].p1);
point_scale(&delta, 1.0/3);
bez->points[1].p1 = bez->points[0].p1;
point_add(&bez->points[1].p1, &delta);
bez->points[1].p2 = bez->points[1].p1;
point_add(&bez->points[1].p2, &delta);
}
bezierline_update_data(bezierline);
}
static DiaObject *
flow_create(Point *startpoint,
void *user_data,
Handle **handle1,
Handle **handle2)
{
Flow *flow;
Connection *conn;
DiaObject *obj;
LineBBExtras *extra;
Point p ;
Point n ;
DiaFont *font;
flow = g_malloc0(sizeof(Flow));
conn = &flow->connection;
conn->endpoints[0] = *startpoint;
conn->endpoints[1] = *startpoint;
conn->endpoints[1].x += 1.5;
obj = &conn->object;
extra = &conn->extra_spacing;
obj->type = &flow_type;
obj->ops = &flow_ops;
connection_init(conn, 3, 0);
p = conn->endpoints[1] ;
point_sub( &p, &conn->endpoints[0] ) ;
point_scale( &p, 0.5 ) ;
n.x = p.y ;
n.y = -p.x ;
if ( fabs(n.x) < 1.e-5 && fabs(n.y) < 1.e-5 ) {
n.x = 0. ;
n.y = -1. ;
} else {
point_normalize( &n ) ;
}
point_scale( &n, 0.5*FLOW_FONTHEIGHT ) ;
point_add( &p, &n ) ;
point_add( &p, &conn->endpoints[0] ) ;
flow->textpos = p;
font = dia_font_new_from_style(DIA_FONT_SANS, FLOW_FONTHEIGHT);
flow->text = new_text("", font, FLOW_FONTHEIGHT, &p, &color_black, ALIGN_CENTER);
dia_font_unref(font);
flow->text_handle.id = HANDLE_MOVE_TEXT;
flow->text_handle.type = HANDLE_MINOR_CONTROL;
flow->text_handle.connect_type = HANDLE_NONCONNECTABLE;
flow->text_handle.connected_to = NULL;
flow->text_handle.pos = p;
obj->handles[2] = &flow->text_handle;
extra->start_long =
extra->end_long =
extra->start_trans = FLOW_WIDTH/2.0;
extra->end_trans = MAX(FLOW_WIDTH, FLOW_ARROWLEN) / 2.0;
flow_update_data(flow);
*handle1 = obj->handles[0];
*handle2 = obj->handles[1];
return &flow->connection.object;
}
static ObjectChange*
flow_move_handle(Flow *flow, Handle *handle,
Point *to, ConnectionPoint *cp,
HandleMoveReason reason, ModifierKeys modifiers)
{
Point p1, p2;
Point *endpoints;
assert(flow!=NULL);
assert(handle!=NULL);
assert(to!=NULL);
if (handle->id == HANDLE_MOVE_TEXT) {
flow->textpos = *to;
} else {
real dest_length ;
real orig_length2 ;
real along_mag, norm_mag ;
Point along ;
endpoints = &flow->connection.endpoints[0];
p1 = flow->textpos ;
point_sub( &p1, &endpoints[0] ) ;
p2 = endpoints[1] ;
point_sub( &p2, &endpoints[0] ) ;
orig_length2= point_dot( &p2, &p2 ) ;
along = p2 ;
if ( orig_length2 > 1e-5 ) {
along_mag = point_dot( &p2, &p1 )/sqrt(orig_length2) ;
along_mag *= along_mag ;
norm_mag = point_dot( &p1, &p1 ) ;
norm_mag = (real)sqrt( (double)( norm_mag - along_mag ) ) ;
along_mag = (real)sqrt( along_mag/orig_length2 ) ;
if ( p1.x*p2.y - p1.y*p2.x > 0.0 )
norm_mag = -norm_mag ;
} else {
along_mag = 0.5 ;
norm_mag = (real)sqrt( (double) point_dot( &p1, &p1 ) ) ;
}
connection_move_handle(&flow->connection, handle->id, to, cp,
reason, modifiers);
p2 = endpoints[1] ;
point_sub( &p2, &endpoints[0] ) ;
flow->textpos = endpoints[0] ;
along = p2 ;
p2.x = -along.y ;
p2.y = along.x ;
dest_length = point_dot( &p2, &p2 ) ;
if ( dest_length > 1e-5 ) {
point_normalize( &p2 ) ;
} else {
p2.x = 0.0 ; p2.y = -1.0 ;
}
point_scale( &p2, norm_mag ) ;
point_scale( &along, along_mag ) ;
point_add( &flow->textpos, &p2 ) ;
point_add( &flow->textpos, &along ) ;
}
flow_update_data(flow);
return NULL;
}
static ObjectChange*
bus_move_handle(Bus *bus, Handle *handle,
Point *to, ConnectionPoint *cp,
HandleMoveReason reason, ModifierKeys modifiers)
{
Connection *conn = &bus->connection;
Point *endpoints;
real *parallel=NULL;
real *perp=NULL;
Point vhat, vhatperp;
Point u;
real vlen, vlen2;
real len_scale;
int i;
const int num_handles = bus->num_handles; /* const to help scan-build */
/* code copied to Misc/tree.c */
parallel = (real *)g_alloca (num_handles * sizeof(real));
perp = (real *)g_alloca (num_handles * sizeof(real));
if (handle->id == HANDLE_BUS) {
handle->pos = *to;
} else {
endpoints = &conn->endpoints[0];
vhat = endpoints[1];
point_sub(&vhat, &endpoints[0]);
if ((fabs(vhat.x) == 0.0) && (fabs(vhat.y)==0.0)) {
vhat.x += 0.01;
}
vlen = sqrt(point_dot(&vhat, &vhat));
point_scale(&vhat, 1.0/vlen);
vhatperp.x = -vhat.y;
vhatperp.y = vhat.x;
for (i=0;i<num_handles;i++) {
u = bus->handles[i]->pos;
point_sub(&u, &endpoints[0]);
parallel[i] = point_dot(&vhat, &u);
perp[i] = point_dot(&vhatperp, &u);
}
connection_move_handle(&bus->connection, handle->id, to, cp,
reason, modifiers);
vhat = endpoints[1];
point_sub(&vhat, &endpoints[0]);
if ((fabs(vhat.x) == 0.0) && (fabs(vhat.y)==0.0)) {
vhat.x += 0.01;
}
vlen2 = sqrt(point_dot(&vhat, &vhat));
len_scale = vlen2 / vlen;
point_normalize(&vhat);
vhatperp.x = -vhat.y;
vhatperp.y = vhat.x;
for (i=0;i<num_handles;i++) {
if (bus->handles[i]->connected_to == NULL) {
u = vhat;
point_scale(&u, parallel[i]*len_scale);
point_add(&u, &endpoints[0]);
bus->parallel_points[i] = u;
u = vhatperp;
point_scale(&u, perp[i]);
point_add(&u, &bus->parallel_points[i]);
bus->handles[i]->pos = u;
}
}
}
bus_update_data(bus);
return NULL;
}
ObjectChange *
beziershape_move_handle(BezierShape *bezier, Handle *handle,
Point *to, ConnectionPoint *cp,
HandleMoveReason reason, ModifierKeys modifiers)
{
int handle_nr, comp_nr, next_nr, prev_nr;
Point delta, pt;
delta = *to;
point_sub(&delta, &handle->pos);
handle_nr = get_handle_nr(bezier, handle);
comp_nr = get_comp_nr(handle_nr);
next_nr = comp_nr + 1;
prev_nr = comp_nr - 1;
if (comp_nr == bezier->numpoints - 1)
next_nr = 1;
if (comp_nr == 1)
prev_nr = bezier->numpoints - 1;
switch(handle->id) {
case HANDLE_BEZMAJOR:
if (comp_nr == bezier->numpoints - 1) {
bezier->points[comp_nr].p3 = *to;
bezier->points[0].p1 = bezier->points[0].p3 = *to;
point_add(&bezier->points[comp_nr].p2, &delta);
point_add(&bezier->points[1].p1, &delta);
} else {
bezier->points[comp_nr].p3 = *to;
point_add(&bezier->points[comp_nr].p2, &delta);
point_add(&bezier->points[comp_nr+1].p1, &delta);
}
break;
case HANDLE_LEFTCTRL:
bezier->points[comp_nr].p2 = *to;
switch (bezier->corner_types[comp_nr]) {
case BEZ_CORNER_SYMMETRIC:
pt = bezier->points[comp_nr].p3;
point_sub(&pt, &bezier->points[comp_nr].p2);
point_add(&pt, &bezier->points[comp_nr].p3);
bezier->points[next_nr].p1 = pt;
break;
case BEZ_CORNER_SMOOTH: {
real len;
pt = bezier->points[next_nr].p1;
point_sub(&pt, &bezier->points[comp_nr].p3);
len = point_len(&pt);
pt = bezier->points[comp_nr].p3;
point_sub(&pt, &bezier->points[comp_nr].p2);
if (point_len(&pt) > 0)
point_normalize(&pt);
else {
pt.x = 1.0; pt.y = 0.0;
}
point_scale(&pt, len);
point_add(&pt, &bezier->points[comp_nr].p3);
bezier->points[next_nr].p1 = pt;
break;
}
case BEZ_CORNER_CUSP:
/* no mirror point movement required */
break;
}
break;
case HANDLE_RIGHTCTRL:
bezier->points[comp_nr].p1 = *to;
switch (bezier->corner_types[prev_nr]) {
case BEZ_CORNER_SYMMETRIC:
pt = bezier->points[prev_nr].p3;
point_sub(&pt, &bezier->points[comp_nr].p1);
point_add(&pt, &bezier->points[prev_nr].p3);
bezier->points[prev_nr].p2 = pt;
break;
case BEZ_CORNER_SMOOTH: {
real len;
pt = bezier->points[prev_nr].p2;
point_sub(&pt, &bezier->points[prev_nr].p3);
len = point_len(&pt);
pt = bezier->points[prev_nr].p3;
point_sub(&pt, &bezier->points[comp_nr].p1);
if (point_len(&pt) > 0)
point_normalize(&pt);
else {
pt.x = 1.0; pt.y = 0.0;
}
point_scale(&pt, len);
point_add(&pt, &bezier->points[prev_nr].p3);
bezier->points[prev_nr].p2 = pt;
break;
}
case BEZ_CORNER_CUSP:
/* no mirror point movement required */
break;
}
break;
default:
message_error("Internal error in beziershape_move_handle.");
break;
}
return NULL;
}
static void
bus_update_data(Bus *bus)
{
Connection *conn = &bus->connection;
DiaObject *obj = &conn->object;
int i;
Point u, v, vhat;
Point *endpoints;
real ulen;
real min_par, max_par;
/*
* This seems to break stuff wildly.
*/
/*
if (connpoint_is_autogap(conn->endpoint_handles[0].connected_to) ||
connpoint_is_autogap(conn->endpoint_handles[1].connected_to)) {
connection_adjust_for_autogap(conn);
}
*/
endpoints = &conn->endpoints[0];
obj->position = endpoints[0];
v = endpoints[1];
point_sub(&v, &endpoints[0]);
if ((fabs(v.x) == 0.0) && (fabs(v.y)==0.0)) {
v.x += 0.01;
}
vhat = v;
point_normalize(&vhat);
min_par = 0.0;
max_par = point_dot(&vhat, &v);
for (i=0;i<bus->num_handles;i++) {
u = bus->handles[i]->pos;
point_sub(&u, &endpoints[0]);
ulen = point_dot(&u, &vhat);
min_par = MIN(min_par, ulen);
max_par = MAX(max_par, ulen);
bus->parallel_points[i] = vhat;
point_scale(&bus->parallel_points[i], ulen);
point_add(&bus->parallel_points[i], &endpoints[0]);
}
min_par -= LINE_WIDTH/2.0;
max_par += LINE_WIDTH/2.0;
bus->real_ends[0] = vhat;
point_scale(&bus->real_ends[0], min_par);
point_add(&bus->real_ends[0], &endpoints[0]);
bus->real_ends[1] = vhat;
point_scale(&bus->real_ends[1], max_par);
point_add(&bus->real_ends[1], &endpoints[0]);
connection_update_boundingbox(conn);
rectangle_add_point(&obj->bounding_box, &bus->real_ends[0]);
rectangle_add_point(&obj->bounding_box, &bus->real_ends[1]);
for (i=0;i<bus->num_handles;i++) {
rectangle_add_point(&obj->bounding_box, &bus->handles[i]->pos);
}
connection_update_handles(conn);
}
static ObjectChange*
bus_move_handle(Bus *bus, Handle *handle,
Point *to, ConnectionPoint *cp,
HandleMoveReason reason, ModifierKeys modifiers)
{
Connection *conn = &bus->connection;
Point *endpoints;
static real *parallel=NULL;
static real *perp=NULL;
static int max_num=0;
Point vhat, vhatperp;
Point u;
real vlen, vlen2;
real len_scale;
int i;
if (bus->num_handles>max_num) {
if (parallel!=NULL) {
g_free(parallel);
g_free(perp);
}
parallel = g_malloc(sizeof(real)*bus->num_handles);
perp = g_malloc(sizeof(real)*bus->num_handles);
max_num = bus->num_handles;
}
if (handle->id == HANDLE_BUS) {
handle->pos = *to;
} else {
endpoints = &conn->endpoints[0];
vhat = endpoints[1];
point_sub(&vhat, &endpoints[0]);
if ((fabs(vhat.x) == 0.0) && (fabs(vhat.y)==0.0)) {
vhat.x += 0.01;
}
vlen = sqrt(point_dot(&vhat, &vhat));
point_scale(&vhat, 1.0/vlen);
vhatperp.x = -vhat.y;
vhatperp.y = vhat.x;
for (i=0;i<bus->num_handles;i++) {
u = bus->handles[i]->pos;
point_sub(&u, &endpoints[0]);
parallel[i] = point_dot(&vhat, &u);
perp[i] = point_dot(&vhatperp, &u);
}
connection_move_handle(&bus->connection, handle->id, to, cp,
reason, modifiers);
vhat = endpoints[1];
point_sub(&vhat, &endpoints[0]);
if ((fabs(vhat.x) == 0.0) && (fabs(vhat.y)==0.0)) {
vhat.x += 0.01;
}
vlen2 = sqrt(point_dot(&vhat, &vhat));
len_scale = vlen2 / vlen;
point_normalize(&vhat);
vhatperp.x = -vhat.y;
vhatperp.y = vhat.x;
for (i=0;i<bus->num_handles;i++) {
if (bus->handles[i]->connected_to == NULL) {
u = vhat;
point_scale(&u, parallel[i]*len_scale);
point_add(&u, &endpoints[0]);
bus->parallel_points[i] = u;
u = vhatperp;
point_scale(&u, perp[i]);
point_add(&u, &bus->parallel_points[i]);
bus->handles[i]->pos = u;
}
}
}
bus_update_data(bus);
return NULL;
}
/*!
* \brief Move one of the handles associated with the
* @param bezier The object whose handle is being moved.
* @param handle The handle being moved.
* @param to The position it has been moved to (corrected for
* vertical/horizontal only movement).
* @param cp If non-NULL, the connectionpoint found at this position.
* If @a cp is NULL, there may or may not be a connectionpoint.
* @param reason ignored
* @param modifiers ignored
* @return NULL
* \memberof BezierConn
*/
ObjectChange*
bezierconn_move_handle (BezierConn *bezier,
Handle *handle,
Point *to,
ConnectionPoint *cp,
HandleMoveReason reason,
ModifierKeys modifiers)
{
int handle_nr, comp_nr;
Point delta, pt;
delta = *to;
point_sub(&delta, &handle->pos);
handle_nr = get_handle_nr(bezier, handle);
comp_nr = get_comp_nr(handle_nr);
switch(handle->id) {
case HANDLE_MOVE_STARTPOINT:
bezier->bezier.points[0].p1 = *to;
/* shift adjacent point */
point_add(&bezier->bezier.points[1].p1, &delta);
break;
case HANDLE_MOVE_ENDPOINT:
bezier->bezier.points[bezier->bezier.num_points-1].p3 = *to;
/* shift adjacent point */
point_add(&bezier->bezier.points[bezier->bezier.num_points-1].p2, &delta);
break;
case HANDLE_BEZMAJOR:
bezier->bezier.points[comp_nr].p3 = *to;
/* shift adjacent point */
point_add(&bezier->bezier.points[comp_nr].p2, &delta);
point_add(&bezier->bezier.points[comp_nr+1].p1, &delta);
break;
case HANDLE_LEFTCTRL:
bezier->bezier.points[comp_nr].p2 = *to;
if (comp_nr < bezier->bezier.num_points - 1) {
switch (bezier->bezier.corner_types[comp_nr]) {
case BEZ_CORNER_SYMMETRIC:
pt = bezier->bezier.points[comp_nr].p3;
point_sub(&pt, &bezier->bezier.points[comp_nr].p2);
point_add(&pt, &bezier->bezier.points[comp_nr].p3);
bezier->bezier.points[comp_nr+1].p1 = pt;
break;
case BEZ_CORNER_SMOOTH: {
real len;
pt = bezier->bezier.points[comp_nr+1].p1;
point_sub(&pt, &bezier->bezier.points[comp_nr].p3);
len = point_len(&pt);
pt = bezier->bezier.points[comp_nr].p2;
point_sub(&pt, &bezier->bezier.points[comp_nr].p3);
if (point_len(&pt) > 0)
point_normalize(&pt);
else { pt.x = 1.0; pt.y = 0.0; }
point_scale(&pt, -len);
point_add(&pt, &bezier->bezier.points[comp_nr].p3);
bezier->bezier.points[comp_nr+1].p1 = pt;
break;
}
case BEZ_CORNER_CUSP:
/* Do nothing to the other guy */
break;
}
}
break;
case HANDLE_RIGHTCTRL:
bezier->bezier.points[comp_nr].p1 = *to;
if (comp_nr > 1) {
switch (bezier->bezier.corner_types[comp_nr-1]) {
case BEZ_CORNER_SYMMETRIC:
pt = bezier->bezier.points[comp_nr - 1].p3;
point_sub(&pt, &bezier->bezier.points[comp_nr].p1);
point_add(&pt, &bezier->bezier.points[comp_nr - 1].p3);
bezier->bezier.points[comp_nr-1].p2 = pt;
break;
case BEZ_CORNER_SMOOTH: {
real len;
pt = bezier->bezier.points[comp_nr-1].p2;
point_sub(&pt, &bezier->bezier.points[comp_nr-1].p3);
len = point_len(&pt);
pt = bezier->bezier.points[comp_nr].p1;
point_sub(&pt, &bezier->bezier.points[comp_nr-1].p3);
if (point_len(&pt) > 0)
point_normalize(&pt);
else { pt.x = 1.0; pt.y = 0.0; }
point_scale(&pt, -len);
point_add(&pt, &bezier->bezier.points[comp_nr-1].p3);
bezier->bezier.points[comp_nr-1].p2 = pt;
break;
}
case BEZ_CORNER_CUSP:
/* Do nothing to the other guy */
break;
}
}
break;
default:
g_warning("Internal error in bezierconn_move_handle.\n");
break;
}
return NULL;
}
static void
arc_draw(Arc *arc, Renderer *renderer)
{
Point *endpoints;
real width;
assert(arc != NULL);
assert(renderer != NULL);
endpoints = &arc->connection.endpoints[0];
renderer->ops->set_linewidth(renderer, arc->line_width);
renderer->ops->set_linestyle(renderer, arc->line_style);
renderer->ops->set_dashlength(renderer, arc->dashlength);
renderer->ops->set_linecaps(renderer, LINECAPS_BUTT);
/* Special case when almost line: */
if (fabs(arc->curve_distance) <= 0.0001) {
renderer->ops->draw_line(renderer,
&endpoints[0], &endpoints[1],
&arc->arc_color);
return;
}
width = 2*arc->radius;
renderer->ops->draw_arc(renderer,
&arc->center,
width, width,
arc->angle1, arc->angle2,
&arc->arc_color);
if (arc->start_arrow.type != ARROW_NONE ||
arc->end_arrow.type != ARROW_NONE) {
Point reversepoint, centervec;
Point controlpoint0, controlpoint1;
real len, len2;
centervec = endpoints[0];
point_sub(¢ervec, &endpoints[1]);
point_scale(¢ervec, 0.5);
len = centervec.x*centervec.x+centervec.y*centervec.y;
point_add(¢ervec, &endpoints[1]);
/* Centervec should now be the midpoint between [0] and [1] */
reversepoint = centervec;
point_sub(¢ervec, &arc->center);
len2 = centervec.x*centervec.x+centervec.y*centervec.y;
if (len2 != 0) {
point_scale(¢ervec, 1/len2);
}
point_scale(¢ervec, len);
point_add(&reversepoint, ¢ervec);
controlpoint0 = controlpoint1 = reversepoint;
len = arc->angle2-arc->angle1;
if (len > 180 || (len < 0.0 && len > -180)) {
centervec = endpoints[0];
point_sub(¢ervec, &reversepoint);
point_add(&controlpoint0, ¢ervec);
point_add(&controlpoint0, ¢ervec);
centervec = endpoints[1];
point_sub(¢ervec, &reversepoint);
point_add(&controlpoint1, ¢ervec);
point_add(&controlpoint1, ¢ervec);
}
if (arc->start_arrow.type != ARROW_NONE) {
arrow_draw(renderer, arc->start_arrow.type,
&endpoints[0],&controlpoint0,
arc->start_arrow.length, arc->start_arrow.width,
arc->line_width,
&arc->arc_color, &color_white);
}
if (arc->end_arrow.type != ARROW_NONE) {
arrow_draw(renderer, arc->end_arrow.type,
&endpoints[1], &controlpoint1,
arc->end_arrow.length, arc->end_arrow.width,
arc->line_width,
&arc->arc_color, &color_white);
}
}
}
