C++ OGRPoint::IsEmpty方法代码示例

本文整理汇总了C++中OGRPoint::IsEmpty方法的典型用法代码示例。如果您正苦于以下问题：C++ OGRPoint::IsEmpty方法的具体用法？C++ OGRPoint::IsEmpty怎么用？C++ OGRPoint::IsEmpty使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类OGRPoint的用法示例。

在下文中一共展示了OGRPoint::IsEmpty方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: PointOnSurface

int OGRPolygon::PointOnSurface( OGRPoint *poPoint ) const

{
    if( poPoint == NULL )
        return OGRERR_FAILURE;

    OGRGeometryH hInsidePoint = OGR_G_PointOnSurface( (OGRGeometryH) this );
    if( hInsidePoint == NULL )
        return OGRERR_FAILURE;

    OGRPoint *poInsidePoint = (OGRPoint *) hInsidePoint;
    if( poInsidePoint->IsEmpty() )
        poPoint->empty();
    else
    {
        poPoint->setX( poInsidePoint->getX() );
        poPoint->setY( poInsidePoint->getY() );
    }

    return OGRERR_NONE;
}

开发者ID:imincik，项目名称:pkg-gdal，代码行数:21，代码来源:ogrpolygon.cpp

示例2: exportToWkt

OGRErr OGRMultiPoint::exportToWkt( char ** ppszDstText,
                                   OGRwkbVariant eWkbVariant ) const

{
    size_t nMaxString = static_cast<size_t>(getNumGeometries()) * 22 + 130;
    size_t nRetLen = 0;

/* -------------------------------------------------------------------- */
/*      Return MULTIPOINT EMPTY if we get no valid points.              */
/* -------------------------------------------------------------------- */
    if( IsEmpty() )
    {
        if( eWkbVariant == wkbVariantIso )
        {
            if( (flags & OGR_G_3D) && (flags & OGR_G_MEASURED) )
                *ppszDstText = CPLStrdup("MULTIPOINT ZM EMPTY");
            else if( flags & OGR_G_MEASURED )
                *ppszDstText = CPLStrdup("MULTIPOINT M EMPTY");
            else if( flags & OGR_G_3D )
                *ppszDstText = CPLStrdup("MULTIPOINT Z EMPTY");
            else
                *ppszDstText = CPLStrdup("MULTIPOINT EMPTY");
        }
        else
            *ppszDstText = CPLStrdup("MULTIPOINT EMPTY");
        return OGRERR_NONE;
    }

    *ppszDstText = static_cast<char *>(VSI_MALLOC_VERBOSE( nMaxString ));
    if( *ppszDstText == NULL )
        return OGRERR_NOT_ENOUGH_MEMORY;

    if( eWkbVariant == wkbVariantIso )
    {
        if( (flags & OGR_G_3D) && (flags & OGR_G_MEASURED) )
            snprintf( *ppszDstText, nMaxString, "%s ZM (", getGeometryName() );
        else if( flags & OGR_G_MEASURED )
            snprintf( *ppszDstText, nMaxString, "%s M (", getGeometryName() );
        else if( flags & OGR_G_3D )
            snprintf( *ppszDstText, nMaxString, "%s Z (", getGeometryName() );
        else
            snprintf( *ppszDstText, nMaxString, "%s (", getGeometryName() );
    }
    else
        snprintf( *ppszDstText, nMaxString, "%s (", getGeometryName() );

    bool bMustWriteComma = false;
    for( int i = 0; i < getNumGeometries(); i++ )
    {
        OGRPoint *poPoint = (OGRPoint *) getGeometryRef( i );

        if( poPoint->IsEmpty() )
        {
            CPLDebug("OGR",
                     "OGRMultiPoint::exportToWkt() - skipping POINT EMPTY.");
            continue;
        }

        if( bMustWriteComma )
            strcat( *ppszDstText + nRetLen, "," );
        bMustWriteComma = true;

        nRetLen += strlen(*ppszDstText + nRetLen);

        if( nMaxString < nRetLen + 100 )
        {
            nMaxString = nMaxString * 2;
            *ppszDstText =
                static_cast<char *>(CPLRealloc(*ppszDstText, nMaxString));
        }

        if( eWkbVariant == wkbVariantIso )
        {
            strcat( *ppszDstText + nRetLen, "(" );
            nRetLen++;
        }

        OGRMakeWktCoordinateM(
            *ppszDstText + nRetLen,
            poPoint->getX(),
            poPoint->getY(),
            poPoint->getZ(),
            poPoint->getM(),
            poPoint->Is3D(),
            poPoint->IsMeasured() && (eWkbVariant == wkbVariantIso));

        if( eWkbVariant == wkbVariantIso )
        {
            strcat( *ppszDstText + nRetLen, ")" );
            nRetLen++;
        }
    }

    strcat( *ppszDstText+nRetLen, ")" );

    return OGRERR_NONE;
}

开发者ID:Mavrx-inc，项目名称:gdal，代码行数:97，代码来源:ogrmultipoint.cpp

示例3: paintMap


//.........这里部分代码省略.........
					x/=scaleFactor; y/=scaleFactor;

					if(i==0)
						path = WPainterPath( WPointF(x, y));
					else
						path.lineTo( x , y);
				}

				painter.drawPath(path); 
				poGeometry->Centroid(centroid); 
			}

			else if( (poGeometry != NULL)  &&  wkbFlatten(poGeometry->getGeometryType()) == wkbPolygon) 
			{
				OGRPolygon *poPoint = (OGRPolygon *) poGeometry;
				OGRLinearRing *extring = poPoint->getExteriorRing();

				int n = extring->getNumPoints();
				double x, y;
				for(int i=0;i<n;i++)
				{
					x = extring->getX(i);   y = extring->getY(i);
					x/=scaleFactor; y/=scaleFactor;
					if(i==0)
						path = WPainterPath( WPointF(x , y));

					else
						path.lineTo( x , y);
				}
				painter.drawPath(path);
				poGeometry->Centroid(centroid);

			}
			else if( (poGeometry != NULL)  &&  wkbFlatten(poGeometry->getGeometryType()) == wkbMultiPolygon) 
			{
				double x, y;
				OGRMultiPolygon *poPoint = (OGRMultiPolygon *) poGeometry;
				int p = poPoint->getNumGeometries();
				for(int k=0;k<p;k++) {
					OGRGeometry* geom = poPoint->getGeometryRef(k);
					OGRPolygon *poly = (OGRPolygon *) geom;
					OGRLinearRing  *ring = poly->getExteriorRing();

					for(int i=0;i<ring->getNumPoints();i++)
					{
						x = ring->getX(i);   y = ring->getY(i);
						x/=scaleFactor; y/=scaleFactor;
						if(i==0)
							path = WPainterPath( WPointF(x , y));
						else
							path.lineTo( x , y);

					}
					painter.drawPath(path); 
					poGeometry->Centroid(centroid);


				}

			}
			if(labelindex>0 && !centroid->IsEmpty()){
				LABELS l={centroid->getX(),centroid->getY(),label};
				label_list.push_back(l);
			}
		}
		painter.restore(); 


		//labelling the contents
if(increase_width<100 && increase_height<100){
		painter.setWindow(0.0, 0.0, (paintDevice->width()).value(),(paintDevice->height()).value());
		font= new WFont(WFont::SansSerif);
		font->setSize(WLength(10*labelpercentage));
		painter.setFont(*font);
		pen.setColor(labelcolor);
		painter.setPen(pen);
		std::vector<LABELS>::iterator the_iterator = label_list.begin();
		double x, y, minx=(xMin+(-x_pos_shift+increase_width/2)/100*gWidth* widthFactor),miny=(yMax+(y_pos_shift-increase_height/2)/100*gHeight*widthFactor);
		
		double multx=(paintDevice->width().value())/(gWidth* widthFactor*(100-increase_width)/100);
		double multy=(paintDevice->height().value())/(gHeight*widthFactor*(-1+increase_height/100));

		while( the_iterator != label_list.end() ) {
		
		x=((*the_iterator).x/scaleFactor-minx)*multx;
		y=((*the_iterator).y/scaleFactor-miny)*multy;
	
		painter.drawText(WRectF( x-(*the_iterator).label.size()*5*labelpercentage, y-5*labelpercentage, (*the_iterator).label.size()	*10*labelpercentage,10*labelpercentage),AlignCenter,(*the_iterator).label);
			++the_iterator;
		}
		pen.setColor(red);
		painter.setPen(pen);
		painter.setFont(*font);
		//painter.drawText(WRectF(paintDevice->width().value()-dfile.size()*10*labelpercentage,paintDevice->height().value()-10*labelpercentage*(paintDevice->height()).value(), dfile.size()*10*labelpercentage,10*labelpercentage ),AlignCenter,dfile); //this text is not seen in the picture when painted.
}
	}					



}

开发者ID:LSI-IIIT，项目名称:lsiviewer，代码行数:101，代码来源:drawshape.cpp

示例4: exportToWkt

OGRErr OGRMultiPoint::exportToWkt( char ** ppszDstText,
                                   OGRwkbVariant eWkbVariant ) const

{
    int         nMaxString = getNumGeometries() * 22 + 128;
    int         nRetLen = 0;

/* -------------------------------------------------------------------- */
/*      Return MULTIPOINT EMPTY if we get no valid points.              */
/* -------------------------------------------------------------------- */
    if( IsEmpty() )
    {
        if( getCoordinateDimension() == 3 && eWkbVariant == wkbVariantIso )
            *ppszDstText = CPLStrdup("MULTIPOINT Z EMPTY");
        else
            *ppszDstText = CPLStrdup("MULTIPOINT EMPTY");
        return OGRERR_NONE;
    }

    *ppszDstText = (char *) VSIMalloc( nMaxString );
    if( *ppszDstText == NULL )
        return OGRERR_NOT_ENOUGH_MEMORY;

    if( getCoordinateDimension() == 3 && eWkbVariant == wkbVariantIso )
        sprintf( *ppszDstText, "%s Z (", getGeometryName() );
    else
        sprintf( *ppszDstText, "%s (", getGeometryName() );

    int bMustWriteComma = FALSE;
    for( int i = 0; i < getNumGeometries(); i++ )
    {
        OGRPoint        *poPoint = (OGRPoint *) getGeometryRef( i );

        if (poPoint->IsEmpty())
        {
            CPLDebug( "OGR", "OGRMultiPoint::exportToWkt() - skipping POINT EMPTY.");
            continue;
        }

        if( bMustWriteComma )
            strcat( *ppszDstText + nRetLen, "," );
        bMustWriteComma = TRUE;

        nRetLen += strlen(*ppszDstText + nRetLen);

        if( nMaxString < nRetLen + 100 )
        {
            nMaxString = nMaxString * 2;
            *ppszDstText = (char *) CPLRealloc(*ppszDstText,nMaxString);
        }

        if( eWkbVariant == wkbVariantIso )
        {
            strcat( *ppszDstText + nRetLen, "(" );
            nRetLen ++;
        }

        OGRMakeWktCoordinate( *ppszDstText + nRetLen,
                              poPoint->getX(), 
                              poPoint->getY(),
                              poPoint->getZ(),
                              poPoint->getCoordinateDimension() );

        if( eWkbVariant == wkbVariantIso )
        {
            strcat( *ppszDstText + nRetLen, ")" );
            nRetLen ++;
        }
    }

    strcat( *ppszDstText+nRetLen, ")" );

    return OGRERR_NONE;
}

开发者ID:drownedout，项目名称:datamap，代码行数:74，代码来源:ogrmultipoint.cpp

注：本文中的OGRPoint::IsEmpty方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。