source: ntrip/trunk/BNC/qwt/qwt_series_data.h@ 5681

Last change on this file since 5681 was 4271, checked in by mervart, 12 years ago
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1/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2 * Qwt Widget Library
3 * Copyright (C) 1997 Josef Wilgen
4 * Copyright (C) 2002 Uwe Rathmann
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the Qwt License, Version 1.0
8 *****************************************************************************/
9
10#ifndef QWT_SERIES_DATA_H
11#define QWT_SERIES_DATA_H 1
12
13#include "qwt_global.h"
14#include "qwt_interval.h"
15#include "qwt_point_3d.h"
16#include "qwt_point_polar.h"
17#include <qvector.h>
18#include <qrect.h>
19
20//! \brief A sample of the types (x1-x2, y) or (x, y1-y2)
21class QWT_EXPORT QwtIntervalSample
22{
23public:
24 QwtIntervalSample();
25 QwtIntervalSample( double, const QwtInterval & );
26 QwtIntervalSample( double value, double min, double max );
27
28 bool operator==( const QwtIntervalSample & ) const;
29 bool operator!=( const QwtIntervalSample & ) const;
30
31 //! Value
32 double value;
33
34 //! Interval
35 QwtInterval interval;
36};
37
38/*!
39 Constructor
40 The value is set to 0.0, the interval is invalid
41*/
42inline QwtIntervalSample::QwtIntervalSample():
43 value( 0.0 )
44{
45}
46
47//! Constructor
48inline QwtIntervalSample::QwtIntervalSample(
49 double v, const QwtInterval &intv ):
50 value( v ),
51 interval( intv )
52{
53}
54
55//! Constructor
56inline QwtIntervalSample::QwtIntervalSample(
57 double v, double min, double max ):
58 value( v ),
59 interval( min, max )
60{
61}
62
63//! Compare operator
64inline bool QwtIntervalSample::operator==(
65 const QwtIntervalSample &other ) const
66{
67 return value == other.value && interval == other.interval;
68}
69
70//! Compare operator
71inline bool QwtIntervalSample::operator!=(
72 const QwtIntervalSample &other ) const
73{
74 return !( *this == other );
75}
76
77//! \brief A sample of the types (x1...xn, y) or (x, y1..yn)
78class QWT_EXPORT QwtSetSample
79{
80public:
81 QwtSetSample();
82 bool operator==( const QwtSetSample &other ) const;
83 bool operator!=( const QwtSetSample &other ) const;
84
85 //! value
86 double value;
87
88 //! Vector of values associated to value
89 QVector<double> set;
90};
91
92/*!
93 Constructor
94 The value is set to 0.0
95*/
96inline QwtSetSample::QwtSetSample():
97 value( 0.0 )
98{
99}
100
101//! Compare operator
102inline bool QwtSetSample::operator==( const QwtSetSample &other ) const
103{
104 return value == other.value && set == other.set;
105}
106
107//! Compare operator
108inline bool QwtSetSample::operator!=( const QwtSetSample &other ) const
109{
110 return !( *this == other );
111}
112
113/*!
114 \brief Abstract interface for iterating over samples
115
116 Qwt offers several implementations of the QwtSeriesData API,
117 but in situations, where data of an application specific format
118 needs to be displayed, without having to copy it, it is recommended
119 to implement an individual data access.
120*/
121template <typename T>
122class QwtSeriesData
123{
124public:
125 QwtSeriesData();
126 virtual ~QwtSeriesData();
127
128 //! \return Number of samples
129 virtual size_t size() const = 0;
130
131 /*!
132 Return a sample
133 \param i Index
134 \return Sample at position i
135 */
136 virtual T sample( size_t i ) const = 0;
137
138 /*!
139 Calculate the bounding rect of all samples
140
141 The bounding rect is necessary for autoscaling and can be used
142 for a couple of painting optimizations.
143
144 qwtBoundingRect(...) offers slow implementations iterating
145 over the samples. For large sets it is recommended to implement
146 something faster f.e. by caching the bounding rect.
147 */
148 virtual QRectF boundingRect() const = 0;
149
150 virtual void setRectOfInterest( const QRectF & );
151
152protected:
153 //! Can be used to cache a calculated bounding rectangle
154 mutable QRectF d_boundingRect;
155
156private:
157 QwtSeriesData<T> &operator=( const QwtSeriesData<T> & );
158};
159
160//! Constructor
161template <typename T>
162QwtSeriesData<T>::QwtSeriesData():
163 d_boundingRect( 0.0, 0.0, -1.0, -1.0 )
164{
165}
166
167//! Destructor
168template <typename T>
169QwtSeriesData<T>::~QwtSeriesData()
170{
171}
172
173/*!
174 Set a the "rect of interest"
175
176 QwtPlotSeriesItem defines the current area of the plot canvas
177 as "rect of interest" ( QwtPlotSeriesItem::updateScaleDiv() ).
178 It can be used to implement different levels of details.
179
180 The default implementation does nothing.
181*/
182template <typename T>
183void QwtSeriesData<T>::setRectOfInterest( const QRectF & )
184{
185}
186
187/*!
188 \brief Template class for data, that is organized as QVector
189
190 QVector uses implicit data sharing and can be
191 passed around as argument efficiently.
192*/
193template <typename T>
194class QwtArraySeriesData: public QwtSeriesData<T>
195{
196public:
197 QwtArraySeriesData();
198 QwtArraySeriesData( const QVector<T> & );
199
200 void setSamples( const QVector<T> & );
201 const QVector<T> samples() const;
202
203 virtual size_t size() const;
204 virtual T sample( size_t ) const;
205
206protected:
207 //! Vector of samples
208 QVector<T> d_samples;
209};
210
211//! Constructor
212template <typename T>
213QwtArraySeriesData<T>::QwtArraySeriesData()
214{
215}
216
217/*!
218 Constructor
219 \param samples Array of samples
220*/
221template <typename T>
222QwtArraySeriesData<T>::QwtArraySeriesData( const QVector<T> &samples ):
223 d_samples( samples )
224{
225}
226
227/*!
228 Assign an array of samples
229 \param samples Array of samples
230*/
231template <typename T>
232void QwtArraySeriesData<T>::setSamples( const QVector<T> &samples )
233{
234 QwtSeriesData<T>::d_boundingRect = QRectF( 0.0, 0.0, -1.0, -1.0 );
235 d_samples = samples;
236}
237
238//! \return Array of samples
239template <typename T>
240const QVector<T> QwtArraySeriesData<T>::samples() const
241{
242 return d_samples;
243}
244
245//! \return Number of samples
246template <typename T>
247size_t QwtArraySeriesData<T>::size() const
248{
249 return d_samples.size();
250}
251
252/*!
253 Return a sample
254 \param i Index
255 \return Sample at position i
256*/
257template <typename T>
258T QwtArraySeriesData<T>::sample( size_t i ) const
259{
260 return d_samples[i];
261}
262
263//! Interface for iterating over an array of points
264class QWT_EXPORT QwtPointSeriesData: public QwtArraySeriesData<QPointF>
265{
266public:
267 QwtPointSeriesData(
268 const QVector<QPointF> & = QVector<QPointF>() );
269
270 virtual QRectF boundingRect() const;
271};
272
273//! Interface for iterating over an array of 3D points
274class QWT_EXPORT QwtPoint3DSeriesData: public QwtArraySeriesData<QwtPoint3D>
275{
276public:
277 QwtPoint3DSeriesData(
278 const QVector<QwtPoint3D> & = QVector<QwtPoint3D>() );
279 virtual QRectF boundingRect() const;
280};
281
282//! Interface for iterating over an array of intervals
283class QWT_EXPORT QwtIntervalSeriesData: public QwtArraySeriesData<QwtIntervalSample>
284{
285public:
286 QwtIntervalSeriesData(
287 const QVector<QwtIntervalSample> & = QVector<QwtIntervalSample>() );
288
289 virtual QRectF boundingRect() const;
290};
291
292//! Interface for iterating over an array of samples
293class QWT_EXPORT QwtSetSeriesData: public QwtArraySeriesData<QwtSetSample>
294{
295public:
296 QwtSetSeriesData(
297 const QVector<QwtSetSample> & = QVector<QwtSetSample>() );
298
299 virtual QRectF boundingRect() const;
300};
301
302/*!
303 \brief Interface for iterating over two QVector<double> objects.
304*/
305class QWT_EXPORT QwtPointArrayData: public QwtSeriesData<QPointF>
306{
307public:
308 QwtPointArrayData( const QVector<double> &x, const QVector<double> &y );
309 QwtPointArrayData( const double *x, const double *y, size_t size );
310
311 virtual QRectF boundingRect() const;
312
313 virtual size_t size() const;
314 virtual QPointF sample( size_t i ) const;
315
316 const QVector<double> &xData() const;
317 const QVector<double> &yData() const;
318
319private:
320 QVector<double> d_x;
321 QVector<double> d_y;
322};
323
324/*!
325 \brief Data class containing two pointers to memory blocks of doubles.
326 */
327class QWT_EXPORT QwtCPointerData: public QwtSeriesData<QPointF>
328{
329public:
330 QwtCPointerData( const double *x, const double *y, size_t size );
331
332 virtual QRectF boundingRect() const;
333 virtual size_t size() const;
334 virtual QPointF sample( size_t i ) const;
335
336 const double *xData() const;
337 const double *yData() const;
338
339private:
340 const double *d_x;
341 const double *d_y;
342 size_t d_size;
343};
344
345/*!
346 \brief Synthetic point data
347
348 QwtSyntheticPointData provides a fixed number of points for an interval.
349 The points are calculated in equidistant steps in x-direction.
350
351 If the interval is invalid, the points are calculated for
352 the "rect of interest", what normally is the displayed area on the
353 plot canvas. In this mode you get different levels of detail, when
354 zooming in/out.
355
356 \par Example
357
358 The following example shows how to implement a sinus curve.
359
360 \verbatim
361#include <cmath>
362#include <qwt_series_data.h>
363#include <qwt_plot_curve.h>
364#include <qwt_plot.h>
365#include <qapplication.h>
366
367class SinusData: public QwtSyntheticPointData
368{
369public:
370 SinusData():
371 QwtSyntheticPointData(100)
372 {
373 }
374 virtual double y(double x) const
375 {
376 return qSin(x);
377 }
378};
379
380int main(int argc, char **argv)
381{
382 QApplication a(argc, argv);
383
384 QwtPlot plot;
385 plot.setAxisScale(QwtPlot::xBottom, 0.0, 10.0);
386 plot.setAxisScale(QwtPlot::yLeft, -1.0, 1.0);
387
388 QwtPlotCurve *curve = new QwtPlotCurve("y = sin(x)");
389 curve->setData(SinusData());
390 curve->attach(&plot);
391
392 plot.show();
393 return a.exec();
394}
395 \endverbatim
396*/
397class QWT_EXPORT QwtSyntheticPointData: public QwtSeriesData<QPointF>
398{
399public:
400 QwtSyntheticPointData( size_t size,
401 const QwtInterval & = QwtInterval() );
402
403 void setSize( size_t size );
404 size_t size() const;
405
406 void setInterval( const QwtInterval& );
407 QwtInterval interval() const;
408
409 virtual QRectF boundingRect() const;
410 virtual QPointF sample( size_t i ) const;
411
412 /*!
413 Calculate a y value for a x value
414
415 \param x x value
416 \return Corresponding y value
417 */
418 virtual double y( double x ) const = 0;
419 virtual double x( uint index ) const;
420
421 virtual void setRectOfInterest( const QRectF & );
422 QRectF rectOfInterest() const;
423
424private:
425 size_t d_size;
426 QwtInterval d_interval;
427 QRectF d_rectOfInterest;
428 QwtInterval d_intervalOfInterest;
429};
430
431QWT_EXPORT QRectF qwtBoundingRect(
432 const QwtSeriesData<QPointF> &, int from = 0, int to = -1 );
433QWT_EXPORT QRectF qwtBoundingRect(
434 const QwtSeriesData<QwtPoint3D> &, int from = 0, int to = -1 );
435QWT_EXPORT QRectF qwtBoundingRect(
436 const QwtSeriesData<QwtPointPolar> &, int from = 0, int to = -1 );
437QWT_EXPORT QRectF qwtBoundingRect(
438 const QwtSeriesData<QwtIntervalSample> &, int from = 0, int to = -1 );
439QWT_EXPORT QRectF qwtBoundingRect(
440 const QwtSeriesData<QwtSetSample> &, int from = 0, int to = -1 );
441
442#endif
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