[Shapelib] Reading Shapefile Polygon is Line

[Richard R McDonald]

My Apologies,
I figured it out.  Should have read points as shpObject->padfX[j].

Again - thanks for the great library.

rich

Rich McDonald
Research Hydrologist
USGS Geomorphology and Sediment Transport Laboratory
4620 Technology Drive, Suite 400
Golden, CO 80403
303 278 7952
rmcd at usgs.gov



Richard R McDonald <rmcd at usgs.gov> 
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03/02/2007 11:36 AM
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[Shapelib] Reading Shapefile Polygon is Line







Hi, 
I am having some success in reading shapefiles using shapelib and am very 
happy to have found this library.  In the code below I am reading a 
shapefile that I know to contain a number of polygons.  However when I 
read the geometry of the polygons - the points represent straight lines. I 
think I'm accessing the shapefile correctly.  If anyone has any idea's on 
why my polygons read as lines I would appreciate the help. 

thanks, 
rich 



void MeshBCCoverage::importShapefile(LPCTSTR pathName, double xOffset, 
double yOffset) 
{ 
//                        CString fext = openDlg.GetFileExt(); 
                SHPHandle shpHandle; 
                shpHandle = SHPOpen(pathName, "rb"); 
                int pnEntities, pnShapeType; 
                double padfMinBound[4], padfMaxBound[4]; 
                double tx, ty, tz; 
                SbVec3f point; 
                SHPGetInfo(shpHandle, &pnEntities, &pnShapeType, 
padfMinBound, padfMaxBound); 
                for(int i = 0; i < pnEntities; i++) { 
                        SHPObject* shpObject = SHPReadObject(shpHandle, 
i); 
                        switch(shpObject->nSHPType) { 
                                case (SHPT_POLYGON): 
                                        { 
                                                this->createNewLine(); 
                                                for(int j = 0; j < 
shpObject->nVertices; j++) { 
                                                        tx = 
*shpObject->padfX+j; 
                                                        ty = 
*shpObject->padfY+j; 
                                                        tz = 
*shpObject->padfZ+j; 
 point.setValue(tx-xOffset, ty-yOffset, this->curIndex+1); 
                                                        this
->addPoint(point); 
                                                        this
->rbrBandPoint(point); 
                                                } 
                                                this->finishLine(); 
                                        } 
                                        break; 
                        } 
                } 

} 


Rich McDonald
Research Hydrologist
USGS Geomorphology and Sediment Transport Laboratory
4620 Technology Drive, Suite 400
Golden, CO 80403
303 278 7952
rmcd at usgs.gov_______________________________________________
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