/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#include <sdr/contact/viewcontactofsdrpathobj.hxx>

#include <svx/svdopath.hxx>

#include <sdr/primitive2d/sdrattributecreator.hxx>

#include <basegfx/polygon/b2dpolypolygontools.hxx>

#include <sdr/primitive2d/sdrpathprimitive2d.hxx>

#include <drawinglayer/primitive2d/invertprimitive2d.hxx>

#include <basegfx/matrix/b2dhommatrixtools.hxx>

#include <basegfx/polygon/b2dpolygontools.hxx>

#include <osl/diagnose.h>

#include <vcl/canvastools.hxx>

namespace sdr::contact

{

        ViewContactOfSdrPathObj::ViewContactOfSdrPathObj(SdrPathObj& rPathObj)

        :   ViewContactOfTextObj(rPathObj)

        {

        }

        ViewContactOfSdrPathObj::~ViewContactOfSdrPathObj()

        {

        }

        /// return true if polycount == 1

        static bool ensureGeometry(basegfx::B2DPolyPolygon& rUnitPolyPolygon)

        {

            sal_uInt32 nPolyCount(rUnitPolyPolygon.count());

            sal_uInt32 nPointCount(0);

            for(auto const& rPolygon : std::as_const(rUnitPolyPolygon))

            {

                nPointCount += rPolygon.count();

                // return early if we definitely have geometry

                if (nPointCount > 1)

                    return nPolyCount == 1;

            }

            if(!nPointCount)

            {

                OSL_FAIL("PolyPolygon object without geometry detected, this should not be created (!)");

                basegfx::B2DPolygon aFallbackLine;

                aFallbackLine.append(basegfx::B2DPoint(0.0, 0.0));

                aFallbackLine.append(basegfx::B2DPoint(1000.0, 1000.0));

                rUnitPolyPolygon = basegfx::B2DPolyPolygon(aFallbackLine);

                nPolyCount = 1;

            }

            return nPolyCount == 1;

        }

        void ViewContactOfSdrPathObj::createViewIndependentPrimitive2DSequence(drawinglayer::primitive2d::Primitive2DDecompositionVisitor& rVisitor) const

        {

            const SfxItemSet& rItemSet = GetPathObj().GetMergedItemSet();

            const drawinglayer::attribute::SdrLineFillEffectsTextAttribute aAttribute(

                drawinglayer::primitive2d::createNewSdrLineFillEffectsTextAttribute(

                    rItemSet,

                    GetPathObj().getText(0),

                    false));

            basegfx::B2DPolyPolygon aUnitPolyPolygon(GetPathObj().GetPathPoly());

            bool bPolyCountIsOne(ensureGeometry(aUnitPolyPolygon));

            // prepare object transformation and unit polygon (direct model data)

            basegfx::B2DHomMatrix aObjectMatrix;

            basegfx::B2DPolyPolygon aUnitDefinitionPolyPolygon;

            const bool bIsLine(

                !aUnitPolyPolygon.areControlPointsUsed()

                && bPolyCountIsOne

                && 2 == aUnitPolyPolygon.getB2DPolygon(0).count());

            if(bIsLine)

            {

                // special handling for single line mode (2 points)

                const basegfx::B2DPolygon & rSubPolygon(aUnitPolyPolygon.getB2DPolygon(0));

                const basegfx::B2DPoint aStart(rSubPolygon.getB2DPoint(0));

                const basegfx::B2DPoint aEnd(rSubPolygon.getB2DPoint(1));

                const basegfx::B2DVector aLine(aEnd - aStart);

                // #i102548# create new unit polygon for line (horizontal)

                static const basegfx::B2DPolygon aNewPolygon{basegfx::B2DPoint(0.0, 0.0), basegfx::B2DPoint(1.0, 0.0)};

                aUnitPolyPolygon.setB2DPolygon(0, aNewPolygon);

                // #i102548# fill objectMatrix with rotation and offset (no shear for lines)

                aObjectMatrix = basegfx::utils::createScaleShearXRotateTranslateB2DHomMatrix(

                    aLine.getLength(), 1.0,

                    0.0,

                    atan2(aLine.getY(), aLine.getX()),

                    aStart.getX(), aStart.getY());

            }

            else

            {

                // #i102548# create unscaled, unsheared, unrotated and untranslated polygon

                // (unit polygon) by creating the object matrix and back-transforming the polygon

                const basegfx::B2DRange aObjectRange(basegfx::utils::getRange(aUnitPolyPolygon));

                const GeoStat& rGeoStat(GetPathObj().GetGeoStat());

                const double fWidth(aObjectRange.getWidth());

                const double fHeight(aObjectRange.getHeight());

                const double fScaleX(basegfx::fTools::equalZero(fWidth) ? 1.0 : fWidth);

                const double fScaleY(basegfx::fTools::equalZero(fHeight) ? 1.0 : fHeight);

                aObjectMatrix = basegfx::utils::createScaleShearXRotateTranslateB2DHomMatrix(

                    fScaleX, fScaleY,

                    -rGeoStat.mfTanShearAngle,

                    rGeoStat.m_nRotationAngle ? toRadians(36000_deg100 - rGeoStat.m_nRotationAngle) : 0.0,

                    aObjectRange.getMinX(), aObjectRange.getMinY());

                // create unit polygon from object's absolute path

                basegfx::B2DHomMatrix aInverse(aObjectMatrix);

                aInverse.invert();

                aUnitPolyPolygon.transform(aInverse);

                // OperationSmiley: Check if a FillGeometryDefiningShape is set

                const SdrObject* pFillGeometryDefiningShape(GetPathObj().getFillGeometryDefiningShape());

                if(nullptr != pFillGeometryDefiningShape)

                {

                    // If yes, get it's BoundRange and use as defining Geometry for the FillStyle.

                    // If no, aUnitDefinitionPolyPolygon will just be empty and thus be interpreted

                    // as unused.

                    // Using SnapRect will make the FillDefinition to always be extended e.g.

                    // for rotated/sheared objects.

                    const tools::Rectangle& rSnapRect(pFillGeometryDefiningShape->GetSnapRect());

                    aUnitDefinitionPolyPolygon.append(

                        basegfx::utils::createPolygonFromRect(

                                vcl::unotools::b2DRectangleFromRectangle(rSnapRect)));

                    // use same coordinate system as the shape geometry -> this

                    // makes it relative to shape's unit geometry and thus freely

                    // transformable with the shape

                    aUnitDefinitionPolyPolygon.transform(aInverse);

                }

            }

            // create primitive. Always create primitives to allow the decomposition of

            // SdrPathPrimitive2D to create needed invisible elements for HitTest and/or BoundRect

            const drawinglayer::primitive2d::Primitive2DReference xReference(

                new drawinglayer::primitive2d::SdrPathPrimitive2D(

                    aObjectMatrix,

                    aAttribute,

                    std::move(aUnitPolyPolygon),

                    std::move(aUnitDefinitionPolyPolygon)));

#ifdef DBG_UTIL

            // helper to create something that uses InvertPrimitive2D to be able

            // to check/debug implementations in SDPRs. There is not much left

            // doing InvertPrimitive2D nowadays (luckily). To use, create a polygon

            // using one of the polygon tools.

            static bool bTestInvert(false);

            if (bTestInvert)

            {

                drawinglayer::primitive2d::Primitive2DContainer aContainer;

                aContainer.push_back(xReference);

                const drawinglayer::primitive2d::Primitive2DReference xReference2(

                    new drawinglayer::primitive2d::InvertPrimitive2D(std::move(aContainer)));

                rVisitor.visit(xReference2);

                return;

            }

#endif

            rVisitor.visit(xReference);

        }

} // end of namespace

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */