/usr/include/qwt-qt4/qwt_plot_rasteritem.h is in libqwt5-qt4-dev 5.2.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#ifndef QWT_PLOT_RASTERITEM_H
#define QWT_PLOT_RASTERITEM_H
#include <qglobal.h>
#include <qstring.h>
#include <qimage.h>
#include "qwt_plot_item.h"
/*!
\brief A class, which displays raster data
Raster data is a grid of pixel values, that can be represented
as a QImage. It is used for many types of information like
spectrograms, cartograms, geographical maps ...
Often a plot has several types of raster data organized in layers.
( f.e a geographical map, with weather statistics ).
Using setAlpha() raster items can be stacked easily.
QwtPlotRasterItem is only implemented for images of the following formats:
QImage::Format_Indexed8, QImage::Format_ARGB32.
\sa QwtPlotSpectrogram
*/
class QWT_EXPORT QwtPlotRasterItem: public QwtPlotItem
{
public:
/*!
- NoCache\n
renderImage() is called, whenever the item has to be repainted
- PaintCache\n
renderImage() is called, whenever the image cache is not valid,
or the scales, or the size of the canvas has changed. This type
of cache is only useful for improving the performance of hide/show
operations. All other situations are already handled by the
plot canvas cache.
- ScreenCache\n
The screen cache is an image in size of the screen. As long as
the scales don't change the target image is scaled from the cache.
This might improve the performance
when resizing the plot widget, but suffers from scaling effects.
The default policy is NoCache
*/
enum CachePolicy
{
NoCache,
PaintCache,
ScreenCache
};
explicit QwtPlotRasterItem(const QString& title = QString::null);
explicit QwtPlotRasterItem(const QwtText& title);
virtual ~QwtPlotRasterItem();
void setAlpha(int alpha);
int alpha() const;
void setCachePolicy(CachePolicy);
CachePolicy cachePolicy() const;
void invalidateCache();
virtual void draw(QPainter *p,
const QwtScaleMap &xMap, const QwtScaleMap &yMap,
const QRect &rect) const;
virtual QSize rasterHint(const QwtDoubleRect &) const;
protected:
/*!
Renders an image for an area
The format of the image must be QImage::Format_Indexed8,
QImage::Format_RGB32 or QImage::Format_ARGB32
\param xMap Maps x-values into pixel coordinates.
\param yMap Maps y-values into pixel coordinates.
\param area Requested area for the image in scale coordinates
*/
virtual QImage renderImage(const QwtScaleMap &xMap,
const QwtScaleMap &yMap, const QwtDoubleRect &area
) const = 0;
private:
QwtPlotRasterItem( const QwtPlotRasterItem & );
QwtPlotRasterItem &operator=( const QwtPlotRasterItem & );
void init();
class PrivateData;
PrivateData *d_data;
};
#endif
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