Qwt User's Guide: qwt_data.cpp Source File

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# qwt_data.cpp

    00001 /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
    00002  * Qwt Widget Library
    00003  * Copyright (C) 1997   Josef Wilgen
    00004  * Copyright (C) 2002   Uwe Rathmann
    00005  *
    00006  * This library is free software; you can redistribute it and/or
    00007  * modify it under the terms of the Qwt License, Version 1.0
    00008  *****************************************************************************/
    00009
    00010 #include "qwt_math.h"
    00011 #include "qwt_data.h"
    00012
    00014 QwtData::QwtData()
    00015 {
    00016 }
    00017
    00019 QwtData::~QwtData()
    00020 {
    00021 }
    00022
    00034 QwtDoubleRect QwtData::boundingRect() const
    00035 {
    00036     const size_t sz = size();
    00037
    00038     if ( sz <= 0 )
    00039         return QwtDoubleRect(1.0, 1.0, -2.0, -2.0); // invalid
    00040
    00041     double minX, maxX, minY, maxY;
    00042     minX = maxX = x(0);
    00043     minY = maxY = y(0);
    00044
    00045     for ( size_t i = 1; i < sz; i++ )
    00046     {
    00047         const double xv = x(i);
    00048         if ( xv < minX )
    00049             minX = xv;
    00050         if ( xv > maxX )
    00051             maxX = xv;
    00052
    00053         const double yv = y(i);
    00054         if ( yv < minY )
    00055             minY = yv;
    00056         if ( yv > maxY )
    00057             maxY = yv;
    00058     }
    00059     return QwtDoubleRect(minX, minY, maxX - minX, maxY - minY);
    00060 }
    00061
    00068 #if QT_VERSION >= 0x040000
    00069 QwtPolygonFData::QwtPolygonFData(const QPolygonF &polygon):
    00070 #else
    00071 QwtPolygonFData::QwtPolygonFData(const QwtArray<QwtDoublePoint> &polygon):
    00072 #endif
    00073     d_data(polygon)
    00074 {
    00075 }
    00076
    00078 QwtPolygonFData& QwtPolygonFData::operator=(
    00079     const QwtPolygonFData &data)
    00080 {
    00081     if (this != &data)
    00082     {
    00083         d_data = data.d_data;
    00084     }
    00085     return *this;
    00086 }
    00087
    00089 size_t QwtPolygonFData::size() const
    00090 {
    00091     return d_data.size();
    00092 }
    00093
    00100 double QwtPolygonFData::x(size_t i) const
    00101 {
    00102     return d_data[int(i)].x();
    00103 }
    00104
    00111 double QwtPolygonFData::y(size_t i) const
    00112 {
    00113     return d_data[int(i)].y();
    00114 }
    00115
    00116 #if QT_VERSION >= 0x040000
    00117 const QPolygonF &QwtPolygonFData::data() const
    00118 #else
    00119 const QwtArray<QwtDoublePoint> &QwtPolygonFData::data() const
    00120 #endif
    00121 {
    00122     return d_data;
    00123 }
    00124
    00128 QwtData *QwtPolygonFData::copy() const
    00129 {
    00130     return new QwtPolygonFData(d_data);
    00131 }
    00132
    00141 QwtArrayData::QwtArrayData(
    00142         const QwtArray<double> &x, const QwtArray<double> &y):
    00143     d_x(x),
    00144     d_y(y)
    00145 {
    00146 }
    00147
    00156 QwtArrayData::QwtArrayData(const double *x, const double *y, size_t size)
    00157 {
    00158 #if QT_VERSION >= 0x040000
    00159     d_x.resize(size);
    00160     qMemCopy(d_x.data(), x, size * sizeof(double));
    00161
    00162     d_y.resize(size);
    00163     qMemCopy(d_y.data(), y, size * sizeof(double));
    00164 #else
    00165     d_x.detach();
    00166     d_x.duplicate(x, size);
    00167
    00168     d_y.detach();
    00169     d_y.duplicate(y, size);
    00170 #endif
    00171 }
    00172
    00174 QwtArrayData& QwtArrayData::operator=(const QwtArrayData &data)
    00175 {
    00176     if (this != &data)
    00177     {
    00178         d_x = data.d_x;
    00179         d_y = data.d_y;
    00180     }
    00181     return *this;
    00182 }
    00183
    00185 size_t QwtArrayData::size() const
    00186 {
    00187     return qwtMin(d_x.size(), d_y.size());
    00188 }
    00189
    00196 double QwtArrayData::x(size_t i) const
    00197 {
    00198     return d_x[int(i)];
    00199 }
    00200
    00207 double QwtArrayData::y(size_t i) const
    00208 {
    00209     return d_y[int(i)];
    00210 }
    00211
    00213 const QwtArray<double> &QwtArrayData::xData() const
    00214 {
    00215     return d_x;
    00216 }
    00217
    00219 const QwtArray<double> &QwtArrayData::yData() const
    00220 {
    00221     return d_y;
    00222 }
    00223
    00227 QwtData *QwtArrayData::copy() const
    00228 {
    00229     return new QwtArrayData(d_x, d_y);
    00230 }
    00231
    00237 QwtDoubleRect QwtArrayData::boundingRect() const
    00238 {
    00239     const size_t sz = size();
    00240
    00241     if ( sz <= 0 )
    00242         return QwtDoubleRect(1.0, 1.0, -2.0, -2.0); // invalid
    00243
    00244     double minX, maxX, minY, maxY;
    00245     QwtArray<double>::ConstIterator xIt = d_x.begin();
    00246     QwtArray<double>::ConstIterator yIt = d_y.begin();
    00247     QwtArray<double>::ConstIterator end = d_x.begin() + sz;
    00248     minX = maxX = *xIt++;
    00249     minY = maxY = *yIt++;
    00250
    00251     while ( xIt < end )
    00252     {
    00253         const double xv = *xIt++;
    00254         if ( xv < minX )
    00255             minX = xv;
    00256         if ( xv > maxX )
    00257             maxX = xv;
    00258
    00259         const double yv = *yIt++;
    00260         if ( yv < minY )
    00261             minY = yv;
    00262         if ( yv > maxY )
    00263             maxY = yv;
    00264     }
    00265     return QwtDoubleRect(minX, minY, maxX - minX, maxY - minY);
    00266 }
    00267
    00281 QwtCPointerData::QwtCPointerData(
    00282     const double *x, const double *y, size_t size):
    00283     d_x(x),
    00284     d_y(y),
    00285     d_size(size)
    00286 {
    00287 }
    00288
    00290 QwtCPointerData& QwtCPointerData::operator=(const QwtCPointerData &data)
    00291 {
    00292     if (this != &data)
    00293     {
    00294         d_x = data.d_x;
    00295         d_y = data.d_y;
    00296         d_size = data.d_size;
    00297     }
    00298     return *this;
    00299 }
    00300
    00302 size_t QwtCPointerData::size() const
    00303 {
    00304     return d_size;
    00305 }
    00306
    00313 double QwtCPointerData::x(size_t i) const
    00314 {
    00315     return d_x[int(i)];
    00316 }
    00317
    00324 double QwtCPointerData::y(size_t i) const
    00325 {
    00326     return d_y[int(i)];
    00327 }
    00328
    00330 const double *QwtCPointerData::xData() const
    00331 {
    00332     return d_x;
    00333 }
    00334
    00336 const double *QwtCPointerData::yData() const
    00337 {
    00338     return d_y;
    00339 }
    00340
    00344 QwtData *QwtCPointerData::copy() const
    00345 {
    00346     return new QwtCPointerData(d_x, d_y, d_size);
    00347 }
    00348
    00354 QwtDoubleRect QwtCPointerData::boundingRect() const
    00355 {
    00356     const size_t sz = size();
    00357
    00358     if ( sz <= 0 )
    00359         return QwtDoubleRect(1.0, 1.0, -2.0, -2.0); // invalid
    00360
    00361     double minX, maxX, minY, maxY;
    00362     const double *xIt = d_x;
    00363     const double *yIt = d_y;
    00364     const double *end = d_x + sz;
    00365     minX = maxX = *xIt++;
    00366     minY = maxY = *yIt++;
    00367
    00368     while ( xIt < end )
    00369     {
    00370         const double xv = *xIt++;
    00371         if ( xv < minX )
    00372             minX = xv;
    00373         if ( xv > maxX )
    00374             maxX = xv;
    00375
    00376         const double yv = *yIt++;
    00377         if ( yv < minY )
    00378             minY = yv;
    00379         if ( yv > maxY )
    00380             maxY = yv;
    00381     }
    00382     return QwtDoubleRect(minX, minY, maxX - minX, maxY - minY);
    00383 }