EVOLUTION-MANAGER

Edit File: ogrdwg_hatch.cpp

/******************************************************************************
 *
 * Project:  DWG Translator
 * Purpose:  Implements translation support for HATCH elements as part
 *           of the OGRDWGLayer class.
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * Copyright (c) 2011, Frank Warmerdam <warmerdam@pobox.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 ****************************************************************************/

#include "ogr_dwg.h"
#include "cpl_conv.h"
#include "ogr_api.h"

#include "ogrdxf_polyline_smooth.h"

CPL_CVSID("$Id: ogrdwg_hatch.cpp 37946 2017-04-10 14:37:01Z rouault $");

static OGRErr DWGCollectBoundaryLoop( OdDbHatchPtr poHatch, int iLoop,
                                      OGRGeometryCollection *poGC );

/************************************************************************/
/*                           TranslateHATCH()                           */
/*                                                                      */
/*      We mostly just try to convert hatch objects as polygons or      */
/*      multipolygons representing the hatched area.  It is hard to     */
/*      preserve the actual details of the hatching.                    */
/************************************************************************/

OGRFeature *OGRDWGLayer::TranslateHATCH( OdDbEntityPtr poEntity )

{
    OGRFeature *poFeature = new OGRFeature( poFeatureDefn );
    OdDbHatchPtr poHatch = OdDbHatch::cast( poEntity );
    OGRGeometryCollection oGC;

TranslateGenericProperties( poFeature, poEntity );

poFeature->SetField( "Text",
                         (const char *) poHatch->patternName() );

/* -------------------------------------------------------------------- */
/*      Collect the loops.                                              */
/* -------------------------------------------------------------------- */
    for( int i = 0; i < poHatch->numLoops(); i++ )
    {
        DWGCollectBoundaryLoop( poHatch, i, &oGC );
    }

/* -------------------------------------------------------------------- */
/*      Try to turn the set of lines into something useful.             */
/* -------------------------------------------------------------------- */
    OGRErr eErr;

OGRGeometryH hFinalGeom =
        OGRBuildPolygonFromEdges( (OGRGeometryH) &oGC,
                                  TRUE, TRUE, 0.0000001, &eErr );

poFeature->SetGeometryDirectly( (OGRGeometry *) hFinalGeom );

/* -------------------------------------------------------------------- */
/*      Work out the color for this feature.  For now we just assume    */
/*      solid fill.  We cannot trivially translate the various sorts    */
/*      of hatching.                                                    */
/* -------------------------------------------------------------------- */
    CPLString osLayer = poFeature->GetFieldAsString("Layer");

int nColor = 256;

if( oStyleProperties.count("Color") > 0 )
        nColor = atoi(oStyleProperties["Color"]);

// Use layer color?
    if( nColor < 1 || nColor > 255 )
    {
        const char *pszValue = poDS->LookupLayerProperty( osLayer, "Color" );
        if( pszValue != NULL )
            nColor = atoi(pszValue);
    }

/* -------------------------------------------------------------------- */
/*      Setup the style string.                                         */
/* -------------------------------------------------------------------- */
    if( nColor >= 1 && nColor <= 255 )
    {
        CPLString osStyle;
        const unsigned char *pabyDWGColors = ACGetColorTable();

osStyle.Printf( "BRUSH(fc:#%02x%02x%02x)",
                        pabyDWGColors[nColor*3+0],
                        pabyDWGColors[nColor*3+1],
                        pabyDWGColors[nColor*3+2] );

poFeature->SetStyleString( osStyle );
    }

return poFeature;
}

/************************************************************************/
/*                        CollectBoundaryLoop()                         */
/************************************************************************/

static OGRErr DWGCollectBoundaryLoop( OdDbHatchPtr poHatch, int iLoop,
                                      OGRGeometryCollection *poGC )

{
    int i;

/* -------------------------------------------------------------------- */
/*      Handle simple polyline loops.                                   */
/* -------------------------------------------------------------------- */
    if( poHatch->loopTypeAt( iLoop ) & OdDbHatch::kPolyline )
    {
        DXFSmoothPolyline   oSmoothPolyline;
        OdGePoint2dArray vertices;
        OdGeDoubleArray bulges;

poHatch->getLoopAt (iLoop, vertices, bulges);

for (i = 0; i < (int) vertices.size(); i++)
        {
            if( i >= (int) bulges.size() )
                oSmoothPolyline.AddPoint( vertices[i].x, vertices[i].y, 0.0,
                                          0.0 );
            else
                oSmoothPolyline.AddPoint( vertices[i].x, vertices[i].y, 0.0,
                                          bulges[i] );
        }

oSmoothPolyline.Close();

OGRLineString *poLS = (OGRLineString *) oSmoothPolyline.Tesselate();
        poGC->addGeometryDirectly( poLS );

return OGRERR_NONE;
    }

/* -------------------------------------------------------------------- */
/*      Handle an edges array.                                          */
/* -------------------------------------------------------------------- */
    EdgeArray oEdges;
    poHatch->getLoopAt( iLoop, oEdges );

for( i = 0; i < (int) oEdges.size(); i++ )
    {
        OdGeCurve2d* poEdge = oEdges[i];

if( poEdge->type() == OdGe::kLineSeg2d )
        {
            OGRLineString *poLS = new OGRLineString();
            OdGePoint2d oStart = poEdge->evalPoint(0.0);
            OdGePoint2d oEnd = poEdge->evalPoint(1.0);

poLS->addPoint( oStart.x, oStart.y );
            poLS->addPoint( oEnd.x, oEnd.y );
            poGC->addGeometryDirectly( poLS );
        }
        else if( poEdge->type() == OdGe::kCircArc2d )
        {
            OdGeCircArc2d* poCircArc = (OdGeCircArc2d*) poEdge;
            OdGePoint2d oCenter = poCircArc->center();
            double dfStartAngle = poCircArc->startAng() * 180 / M_PI;
            double dfEndAngle = poCircArc->endAng() * 180 / M_PI;

if( !poCircArc->isClockWise() )
            {
                dfStartAngle *= -1;
                dfEndAngle *= -1;
            }
            else if( dfStartAngle > dfEndAngle )
            {
                dfEndAngle += 360.0;
            }

OGRLineString *poLS = (OGRLineString *)
                OGRGeometryFactory::approximateArcAngles(
                    oCenter.x, oCenter.y, 0.0,
                    poCircArc->radius(), poCircArc->radius(), 0.0,
                    dfStartAngle, dfEndAngle, 0.0 );

poGC->addGeometryDirectly( poLS );
        }
        else if( poEdge->type() == OdGe::kEllipArc2d )
        {
            OdGeEllipArc2d* poArc = (OdGeEllipArc2d*) poEdge;
            OdGePoint2d oCenter = poArc->center();
            double dfRatio = poArc->minorRadius() / poArc->majorRadius();
            OdGeVector2d oMajorAxis = poArc->majorAxis();
            double dfRotation;
            double dfStartAng, dfEndAng;

dfRotation = -1 * atan2( oMajorAxis.y, oMajorAxis.x ) * 180 / M_PI;

dfStartAng = poArc->startAng()*180/M_PI;
            dfEndAng = poArc->endAng()*180/M_PI;

if( !poArc->isClockWise() )
            {
                dfStartAng *= -1;
                dfEndAng *= -1;
            }
            else if( dfStartAng > dfEndAng )
            {
                dfEndAng += 360.0;
            }

OGRLineString *poLS = (OGRLineString *)
                OGRGeometryFactory::approximateArcAngles(
                    oCenter.x, oCenter.y, 0.0,
                    poArc->majorRadius(), poArc->minorRadius(), dfRotation,
                    OGRDWGLayer::AngleCorrect(dfStartAng,dfRatio),
                    OGRDWGLayer::AngleCorrect(dfEndAng,dfRatio),
                    0.0 );
            poGC->addGeometryDirectly( poLS );
        }
        else
            CPLDebug( "DWG", "Unsupported edge type (%d) in hatch loop.",
                      (int) poEdge->type() );

//case OdGe::kNurbCurve2d : dumpNurbCurveEdge(indent + 1, pEdge);
    }

return OGRERR_NONE;
}