void QgsGrassEditAddVertex::mouseClick( QgsPoint & point, Qt::MouseButton button )
{
double thresh = e->threshold();
switch ( button )
{
case Qt::LeftButton:
// Add vertex to previously selected line
if ( e->mSelectedLine > 0 )
{
e->eraseDynamic();
e->eraseElement( e->mSelectedLine );
// Move vertex
int type = e->mProvider->readLine( e->mPoints, e->mCats, e->mSelectedLine );
if ( e->mAddVertexEnd && e->mSelectedPart == e->mEditPoints->n_points - 1 )
{
e->snap( point );
Vect_append_point( e->mPoints, point.x(), point.y(), 0.0 );
}
else
{
Vect_line_insert_point( e->mPoints, e->mSelectedPart, point.x(), point.y(), 0.0 );
}
Vect_line_prune( e->mPoints );
e->mProvider->rewriteLine( e->mSelectedLine, type, e->mPoints, e->mCats );
e->updateSymb();
e->displayUpdated();
e->mSelectedLine = 0;
Vect_reset_line( e->mEditPoints );
e->setCanvasPrompt( tr( "Select line segment" ), "", "" );
}
else
{
// Select new line
e->mSelectedLine = e->mProvider->findLine( point.x(), point.y(), GV_LINES, thresh );
if ( e->mSelectedLine ) // highlite
{
e->mProvider->readLine( e->mEditPoints, NULL, e->mSelectedLine );
e->displayElement( e->mSelectedLine, e->mSymb[QgsGrassEdit::SYMB_HIGHLIGHT], e->mSize );
double xl, yl; // nearest point on the line
// Note first segment is 1!
e->mSelectedPart = Vect_line_distance( e->mEditPoints, point.x(), point.y(), 0.0, 0,
&xl, &yl, NULL, NULL, NULL, NULL );
double dist1 = Vect_points_distance( xl, yl, 0.0, e->mEditPoints->x[e->mSelectedPart-1],
e->mEditPoints->y[e->mSelectedPart-1], 0.0, 0 );
double dist2 = Vect_points_distance( xl, yl, 0.0, e->mEditPoints->x[e->mSelectedPart],
e->mEditPoints->y[e->mSelectedPart], 0.0, 0 );
double maxdist = ( dist1 + dist2 ) / 4;
if ( e->mSelectedPart == 1 && dist1 < maxdist )
{
e->mSelectedPart = 0;
e->mAddVertexEnd = true;
}
else if ( e->mSelectedPart == e->mEditPoints->n_points - 1 && dist2 < maxdist )
{
e->mAddVertexEnd = true;
}
else
{
e->mAddVertexEnd = false;
}
e->setCanvasPrompt( tr( "New vertex position" ), "", tr( "Release" ) );
}
else
{
e->setCanvasPrompt( tr( "Select line segment" ), "", "" );
}
}
break;
case Qt::RightButton:
e->eraseDynamic();
e->displayElement( e->mSelectedLine, e->mSymb[e->mLineSymb[e->mSelectedLine]], e->mSize );
e->mSelectedLine = 0;
Vect_reset_line( e->mEditPoints );
e->setCanvasPrompt( tr( "Select line segment" ), "", "" );
break;
default:
// ignore others
break;
}
}
int connect_lines(struct Map_info *Map, int first, int line_from, int line_to,
double thresh, struct ilist *List)
{
int line_new;
int type_from, type_to;
int n_points, seg, is;
double x, y, px, py, x1, y1;
double dist, spdist, lpdist, length, dist_p;
double angle_t, angle_f, angle;
struct line_pnts *Points_from, *Points_to, *Points_final;
struct line_cats *Cats_from, *Cats_to;
Points_from = Vect_new_line_struct();
Points_to = Vect_new_line_struct();
Points_final = Vect_new_line_struct();
Cats_from = Vect_new_cats_struct();
Cats_to = Vect_new_cats_struct();
type_from = Vect_read_line(Map, Points_from, Cats_from, line_from);
type_to = Vect_read_line(Map, Points_to, Cats_to, line_to);
line_new = 0;
if (!(type_from & GV_LINES) || !(type_to & GV_LINES))
line_new = -1;
if (line_new > -1) {
if (first) {
x = Points_from->x[0];
y = Points_from->y[0];
}
else {
n_points = Points_from->n_points - 1;
x = Points_from->x[n_points];
y = Points_from->y[n_points];
}
seg = Vect_line_distance(Points_to, x, y, 0.0, WITHOUT_Z,
&px, &py, NULL, &dist, &spdist, &lpdist);
if (seg > 0 && dist > 0.0 && (thresh < 0. || dist <= thresh)) {
/* lines in threshold */
if (first)
length = 0;
else
length = Vect_line_length(Points_from);
if (Vect_point_on_line(Points_from, length,
NULL, NULL, NULL, &angle_f, NULL) > 0) {
if (Vect_point_on_line(Points_to, lpdist,
NULL, NULL, NULL, &angle_t,
NULL) > 0) {
angle = angle_t - angle_f;
dist_p = fabs(dist / sin(angle));
if (first) {
if (angle_f < 0)
angle_f -= M_PI;
else
angle_f += M_PI;
}
x1 = x + dist_p * cos(angle_f);
y1 = y + dist_p * sin(angle_f);
length = Vect_line_length(Points_to);
Vect_line_insert_point(Points_to, seg, x1, y1, 0.);
if (fabs(Vect_line_length(Points_to) - length) < length * 1e-3) {
/* lines connected -> split line_to */
/* update line_from */
if (first) {
Points_from->x[0] = x1;
Points_from->y[0] = y1;
}
else {
Points_from->x[n_points] = x1;
Points_from->y[n_points] = y1;
}
line_new = Vect_rewrite_line(Map, line_from, type_from,
Points_from, Cats_from);
/* Vect_list_append(List, line_new); */
/* update line_to -- first part */
Vect_reset_line(Points_final);
for (is = 0; is < seg; is++) {
Vect_append_point(Points_final, Points_to->x[is],
Points_to->y[is],
Points_to->z[is]);
}
Vect_append_point(Points_final, x1, y1, 0.0);
line_new = Vect_rewrite_line(Map, line_to, type_to,
Points_final, Cats_to);
/* Vect_list_append(List, line_new); */
/* write second part */
Vect_reset_line(Points_final);
Vect_append_point(Points_final, x1, y1, 0.0);
for (is = seg; is < Points_to->n_points; is++) {
Vect_append_point(Points_final, Points_to->x[is],
Points_to->y[is],
Points_to->z[is]);
}
/* rewrite first part */
line_new = Vect_write_line(Map, type_to,
Points_final, Cats_to);
/* Vect_list_append(List, line_new); */
}
}
}
}
}
Vect_destroy_line_struct(Points_from);
Vect_destroy_line_struct(Points_to);
Vect_destroy_line_struct(Points_final);
Vect_destroy_cats_struct(Cats_from);
Vect_destroy_cats_struct(Cats_to);
return line_new > 0 ? 1 : 0;
}
