Qwt User's Guide: qwt_interval_data.cpp Source File

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# qwt_interval_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_interval_data.h"
    00012
    00013 QwtIntervalData::QwtIntervalData()
    00014 {
    00015 }
    00016
    00017 QwtIntervalData::QwtIntervalData(
    00018         const QwtArray<QwtDoubleInterval> &intervals,
    00019         const QwtArray<double> &values):
    00020     d_intervals(intervals),
    00021     d_values(values)
    00022 {
    00023 }
    00024
    00025 void QwtIntervalData::setData(
    00026     const QwtArray<QwtDoubleInterval> &intervals,
    00027     const QwtArray<double> &values)
    00028 {
    00029     d_intervals = intervals;
    00030     d_values = values;
    00031 }
    00032
    00033 QwtDoubleRect QwtIntervalData::boundingRect() const
    00034 {
    00035     double minX, maxX, minY, maxY;
    00036     minX = maxX = minY = maxY = 0.0;
    00037
    00038     bool isValid = false;
    00039
    00040     const size_t sz = size();
    00041     for ( size_t i = 0; i < sz; i++ )
    00042     {
    00043         const QwtDoubleInterval intv = interval(i);
    00044         if ( !intv.isValid() )
    00045             continue;
    00046
    00047         const double v = value(i);
    00048
    00049         if ( !isValid )
    00050         {
    00051             minX = intv.minValue();
    00052             maxX = intv.maxValue();
    00053             minY = maxY = v;
    00054
    00055             isValid = true;
    00056         }
    00057         else
    00058         {
    00059             if ( intv.minValue() < minX )
    00060                 minX = intv.minValue();
    00061             if ( intv.maxValue() > maxX )
    00062                 maxX = intv.maxValue();
    00063
    00064             if ( v < minY )
    00065                 minY = v;
    00066             if ( v > maxY )
    00067                 maxY = v;
    00068         }
    00069     }
    00070     if ( !isValid )
    00071         return QwtDoubleRect(1.0, 1.0, -2.0, -2.0); // invalid
    00072
    00073     return QwtDoubleRect(minX, minY, maxX - minX, maxY - minY);
    00074 }