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// SPDX-License-Identifier: GPL-2.0-or-later
/** \file
* Interface between Inkscape code (SPItem) and remove-overlaps function.
*/
/*
* Authors:
* Tim Dwyer <tgdwyer@gmail.com>
* Abhishek Sharma
*
* Copyright (C) 2005 Authors
*
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#include <utility>
#include <2geom/transforms.h>
#include "removeoverlap.h"
#include "libvpsc/rectangle.h"
#include "object/sp-item.h"
#include "object/sp-item-transform.h"
using vpsc::Rectangle;
namespace {
struct Record {
SPItem * item;
Geom::Point midpoint;
Rectangle * vspc_rect;
Record() : item(nullptr), vspc_rect(nullptr) {}
Record(SPItem * i, Geom::Point m, Rectangle * r)
: item(i), midpoint(m), vspc_rect(r) {}
};
}
/**
* Takes a list of inkscape items and moves them as little as possible
* such that rectangular bounding boxes are separated by at least xGap
* horizontally and yGap vertically
*/
void removeoverlap(std::vector<SPItem*> const & items, double const xGap, double const yGap) {
std::vector<SPItem*> selected = items;
std::vector<Record> records;
std::vector<Rectangle*> rs;
Geom::Point const gap(xGap, yGap);
for (SPItem * item: selected) {
using Geom::X; using Geom::Y;
Geom::OptRect item_box(item->desktopVisualBounds());
if (item_box) {
Geom::Point min(item_box->min() - .5 * gap);
Geom::Point max(item_box->max() + .5 * gap);
// A negative gap is allowed, but will lead to problems when the gap is larger than
// the bounding box (in either X or Y direction, or both); min will have become max
// now, which cannot be handled by Rectangle() which is called below. And how will
// removeRectangleOverlap handle such a case?
// That's why we will enforce some boundaries on min and max here:
if (max[X] < min[X]) {
min[X] = max[X] = (min[X] + max[X]) / 2.;
}
if (max[Y] < min[Y]) {
min[Y] = max[Y] = (min[Y] + max[Y]) / 2.;
}
Rectangle * vspc_rect = new Rectangle(min[X], max[X], min[Y], max[Y]);
records.emplace_back(item, item_box->midpoint(), vspc_rect);
rs.push_back(vspc_rect);
}
}
if (!rs.empty()) {
removeoverlaps(rs);
}
for (Record & rec: records) {
Geom::Point const curr = rec.midpoint;
Geom::Point const dest(rec.vspc_rect->getCentreX(), rec.vspc_rect->getCentreY());
rec.item->move_rel(Geom::Translate(dest - curr));
delete rec.vspc_rect;
}
}
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