彻底改版2.0

third/3rd_qwt/qwt_scale_map.h

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+/* -*- 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_SCALE_MAP_H
+#define QWT_SCALE_MAP_H
+
+#include "qwt_global.h"
+#include "qwt_transform.h"
+#include <qrect.h>
+
+#ifndef QT_NO_DEBUG_STREAM
+#include <qdebug.h>
+#endif
+
+class QRectF;
+
+/*!
+   \brief A scale map
+
+   QwtScaleMap offers transformations from the coordinate system
+   of a scale into the linear coordinate system of a paint device
+   and vice versa.
+*/
+class QWT_EXPORT QwtScaleMap
+{
+public:
+    QwtScaleMap();
+    QwtScaleMap( const QwtScaleMap& );
+
+    ~QwtScaleMap();
+
+    QwtScaleMap &operator=( const QwtScaleMap & );
+
+    void setTransformation( QwtTransform * );
+    const QwtTransform *transformation() const;
+
+    void setPaintInterval( double p1, double p2 );
+    void setScaleInterval( double s1, double s2 );
+
+    double transform( double s ) const;
+    double invTransform( double p ) const;
+
+    double p1() const;
+    double p2() const;
+
+    double s1() const;
+    double s2() const;
+
+    double pDist() const;
+    double sDist() const;
+
+    static QRectF transform( const QwtScaleMap &,
+        const QwtScaleMap &, const QRectF & );
+    static QRectF invTransform( const QwtScaleMap &,
+        const QwtScaleMap &, const QRectF & );
+
+    static QPointF transform( const QwtScaleMap &,
+        const QwtScaleMap &, const QPointF & );
+    static QPointF invTransform( const QwtScaleMap &,
+        const QwtScaleMap &, const QPointF & );
+
+    bool isInverting() const;
+
+private:
+    void updateFactor();
+
+    double d_s1, d_s2;     // scale interval boundaries
+    double d_p1, d_p2;     // paint device interval boundaries
+
+    double d_cnv;       // conversion factor
+    double d_ts1;
+
+    QwtTransform *d_transform;
+};
+
+/*!
+    \return First border of the scale interval
+*/
+inline double QwtScaleMap::s1() const
+{
+    return d_s1;
+}
+
+/*!
+    \return Second border of the scale interval
+*/
+inline double QwtScaleMap::s2() const
+{
+    return d_s2;
+}
+
+/*!
+    \return First border of the paint interval
+*/
+inline double QwtScaleMap::p1() const
+{
+    return d_p1;
+}
+
+/*!
+    \return Second border of the paint interval
+*/
+inline double QwtScaleMap::p2() const
+{
+    return d_p2;
+}
+
+/*!
+    \return qwtAbs(p2() - p1())
+*/
+inline double QwtScaleMap::pDist() const
+{
+    return qAbs( d_p2 - d_p1 );
+}
+
+/*!
+    \return qwtAbs(s2() - s1())
+*/
+inline double QwtScaleMap::sDist() const
+{
+    return qAbs( d_s2 - d_s1 );
+}
+
+/*!
+  Transform a point related to the scale interval into an point
+  related to the interval of the paint device
+
+  \param s Value relative to the coordinates of the scale
+  \return Transformed value
+
+  \sa invTransform()
+*/
+inline double QwtScaleMap::transform( double s ) const
+{
+    if ( d_transform )
+        s = d_transform->transform( s );
+
+    return d_p1 + ( s - d_ts1 ) * d_cnv;
+}
+
+/*!
+  Transform an paint device value into a value in the
+  interval of the scale.
+
+  \param p Value relative to the coordinates of the paint device
+  \return Transformed value
+
+  \sa transform()
+*/
+inline double QwtScaleMap::invTransform( double p ) const
+{
+    double s = d_ts1 + ( p - d_p1 ) / d_cnv;
+    if ( d_transform )
+        s = d_transform->invTransform( s );
+
+    return s;
+}
+
+//! \return True, when ( p1() < p2() ) != ( s1() < s2() )
+inline bool QwtScaleMap::isInverting() const
+{
+    return ( ( d_p1 < d_p2 ) != ( d_s1 < d_s2 ) );
+}
+
+#ifndef QT_NO_DEBUG_STREAM
+QWT_EXPORT QDebug operator<<( QDebug, const QwtScaleMap & );
+#endif
+
+#endif