C++ SPCurve::get_segment_count方法代码示例

static void spdc_attach_selection(FreehandBase *dc, Inkscape::Selection */*sel*/)
{
    // We reset white and forget white/start/end anchors
    spdc_reset_white(dc);
    dc->sa = NULL;
    dc->ea = NULL;

    SPItem *item = dc->selection ? dc->selection->singleItem() : NULL;

    if ( item && SP_IS_PATH(item) ) {
        // Create new white data
        // Item
        dc->white_item = item;

        // Curve list
        // We keep it in desktop coordinates to eliminate calculation errors
        SPCurve *norm = SP_PATH(item)->get_curve_for_edit();
        norm->transform((dc->white_item)->i2dt_affine());
        g_return_if_fail( norm != NULL );
        dc->white_curves = g_slist_reverse(norm->split());
        norm->unref();

        // Anchor list
        for (GSList *l = dc->white_curves; l != NULL; l = l->next) {
            SPCurve *c;
            c = static_cast<SPCurve*>(l->data);
            g_return_if_fail( c->get_segment_count() > 0 );
            if ( !c->is_closed() ) {
                SPDrawAnchor *a;
                a = sp_draw_anchor_new(dc, c, TRUE, *(c->first_point()));
                if (a)
                    dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
                a = sp_draw_anchor_new(dc, c, FALSE, *(c->last_point()));
                if (a)
                    dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
            }
        }
        // fixme: recalculate active anchor?
    }
}

void spdc_concat_colors_and_flush(FreehandBase *dc, gboolean forceclosed)
{
    // Concat RBG
    SPCurve *c = dc->green_curve;
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
    // Green
    dc->green_curve = new SPCurve();
    while (dc->green_bpaths) {
        sp_canvas_item_destroy(SP_CANVAS_ITEM(dc->green_bpaths->data));
        dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
    }

    // Blue
    c->append_continuous(dc->blue_curve, 0.0625);
    dc->blue_curve->reset();
    sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->blue_bpath), NULL);

    // Red
    if (dc->red_curve_is_valid) {
        c->append_continuous(dc->red_curve, 0.0625);
    }
    dc->red_curve->reset();
    sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->red_bpath), NULL);

    if (c->is_empty()) {
        c->unref();
        return;
    }

    // Step A - test, whether we ended on green anchor
    if ( forceclosed || ( dc->green_anchor && dc->green_anchor->active ) ) {
        // We hit green anchor, closing Green-Blue-Red
        dc->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Path is closed."));
        c->closepath_current();
        // Closed path, just flush
        spdc_flush_white(dc, c);
        c->unref();
        return;
    }

    // Step B - both start and end anchored to same curve
    if ( dc->sa && dc->ea
         && ( dc->sa->curve == dc->ea->curve )
         && ( ( dc->sa != dc->ea )
              || dc->sa->curve->is_closed() ) )
    {
        // We hit bot start and end of single curve, closing paths
        dc->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Closing path."));
        if (dc->sa->start && !(dc->sa->curve->is_closed()) ) {
            c = reverse_then_unref(c);
        }
        if(prefs->getInt(tool_name(dc) + "/freehand-mode", 0) == 1 || 
            prefs->getInt(tool_name(dc) + "/freehand-mode", 0) == 2){
            dc->overwrite_curve->append_continuous(c, 0.0625);
            c->unref();
            dc->overwrite_curve->closepath_current();
            if(dc->sa){
                dc->white_curves = g_slist_remove(dc->white_curves, dc->sa->curve);
                dc->white_curves = g_slist_append(dc->white_curves, dc->overwrite_curve);
            }
        }else{
            dc->sa->curve->append_continuous(c, 0.0625);
            c->unref();
            dc->sa->curve->closepath_current();
        }
        spdc_flush_white(dc, NULL);
        return;
    }

    // Step C - test start
    if (dc->sa) {
        SPCurve *s = dc->sa->curve;
        dc->white_curves = g_slist_remove(dc->white_curves, s);
        if(prefs->getInt(tool_name(dc) + "/freehand-mode", 0) == 1 || 
            prefs->getInt(tool_name(dc) + "/freehand-mode", 0) == 2){
                s = dc->overwrite_curve;
        }
        if (dc->sa->start) {
            s = reverse_then_unref(s);
        }
        s->append_continuous(c, 0.0625);
        c->unref();
        c = s;
    } else /* Step D - test end */ if (dc->ea) {
        SPCurve *e = dc->ea->curve;
        dc->white_curves = g_slist_remove(dc->white_curves, e);
        if (!dc->ea->start) {
            e = reverse_then_unref(e);
        }
        if(prefs->getInt(tool_name(dc) + "/freehand-mode", 0) == 1 || 
            prefs->getInt(tool_name(dc) + "/freehand-mode", 0) == 2){
                e = reverse_then_unref(e);
                Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const*>(&*e->last_segment());
                SPCurve *lastSeg = new SPCurve();
                if(cubic){
                    lastSeg->moveto((*cubic)[0]);
                    lastSeg->curveto((*cubic)[1],(*cubic)[3],(*cubic)[3]);
                    if( e->get_segment_count() == 1){
                        e = lastSeg;
                    }else{
//.........这里部分代码省略.........