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git-svn-id: http://svn.osgeo.org/qgis/trunk@548 c8812cc2-4d05-0410-92ff-de0c093fc19c
This commit is contained in:
mhugent 2004-01-21 08:47:31 +00:00
parent 74b7156564
commit f6c38d58ee
1 changed files with 207 additions and 2 deletions
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209
src/qgsvectorlayer.cpp
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@ -22,6 +22,7 @@
/* $Id$ */
#include <iostream>
#include <cfloat>
#include <sstream>
#include <qapplication.h>
#include <qcursor.h>
@ -49,6 +50,7 @@
#include "qgsrenderitem.h"
#include "qgssisydialog.h"
#include "qgsproviderregistry.h"
#include "qgsrect.h"
#ifdef TESTPROVIDERLIB
#include <dlfcn.h>
#endif
@ -710,6 +712,209 @@ QPopupMenu *QgsVectorLayer::contextMenu(){
QgsRect QgsVectorLayer::bBoxOfSelected()
{
QgsRect myrect;//soon
return myrect;
QgsRect rect(DBL_MAX,DBL_MAX,DBL_MIN,DBL_MIN);
dataProvider->reset();
QgsFeature *fet;
unsigned char *feature;
while ((fet = dataProvider->getNextFeature(false)))
{
if(selected.find(fet->featureId())!=selected.end())
{
feature = fet->getGeometry();
int wkbType = (int) feature[1];
double *x;
double *y;
int *nPoints;
int *numRings;
int *numPolygons;
int numPoints;
int numLineStrings;
int idx, jdx, kdx;
unsigned char *ptr;
char lsb;
QgsPoint pt;
QPointArray *pa;
QString fld;
QString val;
switch (wkbType)
{
case WKBPoint:
x = (double *) (feature + 5);
y = (double *) (feature + 5 + sizeof(double));
if(*x<rect.xMin())
{
rect.setXmin(*x);
}
if(*x>rect.xMax())
{
rect.setXmax(*x);
}
if(*y<rect.yMin())
{
rect.setYmin(*y);
}
if(*y>rect.yMax())
{
rect.setYmax(*y);
}
break;
case WKBLineString:
// get number of points in the line
ptr = feature + 5;
nPoints = (int *) ptr;
ptr = feature + 1 + 2 * sizeof(int);
for (idx = 0; idx < *nPoints; idx++)
{
x = (double *) ptr;
ptr += sizeof(double);
y = (double *) ptr;
ptr += sizeof(double);
if(*x<rect.xMin())
{
rect.setXmin(*x);
}
if(*x>rect.xMax())
{
rect.setXmax(*x);
}
if(*y<rect.yMin())
{
rect.setYmin(*y);
}
if(*y>rect.yMax())
{
rect.setYmax(*y);
}
}
break;
case WKBMultiLineString:
numLineStrings = (int) (feature[5]);
ptr = feature + 9;
for (jdx = 0; jdx < numLineStrings; jdx++)
{
// each of these is a wbklinestring so must handle as such
lsb = *ptr;
ptr += 5; // skip type since we know its 2
nPoints = (int *) ptr;
ptr += sizeof(int);
for (idx = 0; idx < *nPoints; idx++)
{
x = (double *) ptr;
ptr += sizeof(double);
y = (double *) ptr;
ptr += sizeof(double);
if(*x<rect.xMin())
{
rect.setXmin(*x);
}
if(*x>rect.xMax())
{
rect.setXmax(*x);
}
if(*y<rect.yMin())
{
rect.setYmin(*y);
}
if(*y>rect.yMax())
{
rect.setYmax(*y);
}
}
}
break;
case WKBPolygon:
// get number of rings in the polygon
numRings = (int *) (feature + 1 + sizeof(int));
ptr = feature + 1 + 2 * sizeof(int);
for (idx = 0; idx < *numRings; idx++)
{
// get number of points in the ring
nPoints = (int *) ptr;
ptr += 4;
for (jdx = 0; jdx < *nPoints; jdx++)
{
// add points to a point array for drawing the polygon
x = (double *) ptr;
ptr += sizeof(double);
y = (double *) ptr;
ptr += sizeof(double);
if(*x<rect.xMin())
{
rect.setXmin(*x);
}
if(*x>rect.xMax())
{
rect.setXmax(*x);
}
if(*y<rect.yMin())
{
rect.setYmin(*y);
}
if(*y>rect.yMax())
{
rect.setYmax(*y);
}
}
}
break;
case WKBMultiPolygon:
// get the number of polygons
ptr = feature + 5;
numPolygons = (int *) ptr;
for (kdx = 0; kdx < *numPolygons; kdx++)
{
//skip the endian and feature type info and
// get number of rings in the polygon
ptr = feature + 14;
numRings = (int *) ptr;
ptr += 4;
for (idx = 0; idx < *numRings; idx++)
{
// get number of points in the ring
nPoints = (int *) ptr;
ptr += 4;
for (jdx = 0; jdx < *nPoints; jdx++)
{
// add points to a point array for drawing the polygon
x = (double *) ptr;
ptr += sizeof(double);
y = (double *) ptr;
ptr += sizeof(double);
if(*x<rect.xMin())
{
rect.setXmin(*x);
}
if(*x>rect.xMax())
{
rect.setXmax(*x);
}
if(*y<rect.yMin())
{
rect.setYmin(*y);
}
if(*y>rect.yMax())
{
rect.setYmax(*y);
}
}
}
}
break;
default:
std::cout << "UNKNOWN WKBTYPE ENCOUNTERED\n";
break;
}
delete[] feature;
}
}
return rect;
}