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# qwt_layout_metrics.h

    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 #ifndef QWT_LAYOUT_METRICS_H
    00011 #define QWT_LAYOUT_METRICS_H
    00012
    00013 #include <qsize.h>
    00014 #include <qrect.h>
    00015 #include "qwt_polygon.h"
    00016 #include "qwt_global.h"
    00017
    00018 class QPainter;
    00019 class QString;
    00020 class QFontMetrics;
    00021 #if QT_VERSION < 0x040000
    00022 class QWMatrix;
    00023 #else
    00024 class QMatrix;
    00025 #endif
    00026 class QPaintDevice;
    00027
    00031 class QWT_EXPORT QwtMetricsMap
    00032 {
    00033 public:
    00034     QwtMetricsMap();
    00035
    00036     bool isIdentity() const;
    00037
    00038     void setMetrics(const QPaintDevice *layoutMetrics,
    00039         const QPaintDevice *deviceMetrics);
    00040
    00041     int layoutToDeviceX(int x) const;
    00042     int deviceToLayoutX(int x) const;
    00043     int screenToLayoutX(int x) const;
    00044     int layoutToScreenX(int x) const;
    00045
    00046     int layoutToDeviceY(int y) const;
    00047     int deviceToLayoutY(int y) const;
    00048     int screenToLayoutY(int y) const;
    00049     int layoutToScreenY(int y) const;
    00050
    00051     QPoint layoutToDevice(const QPoint &, const QPainter * = NULL) const;
    00052     QPoint deviceToLayout(const QPoint &, const QPainter * = NULL) const;
    00053     QPoint screenToLayout(const QPoint &) const;
    00054     QPoint layoutToScreen(const QPoint &point) const;
    00055
    00056
    00057     QSize layoutToDevice(const QSize &) const;
    00058     QSize deviceToLayout(const QSize &) const;
    00059     QSize screenToLayout(const QSize &) const;
    00060     QSize layoutToScreen(const QSize &) const;
    00061
    00062     QRect layoutToDevice(const QRect &, const QPainter * = NULL) const;
    00063     QRect deviceToLayout(const QRect &, const QPainter * = NULL) const;
    00064     QRect screenToLayout(const QRect &) const;
    00065     QRect layoutToScreen(const QRect &) const;
    00066
    00067     QwtPolygon layoutToDevice(const QwtPolygon &,
    00068         const QPainter * = NULL) const;
    00069     QwtPolygon deviceToLayout(const QwtPolygon &,
    00070         const QPainter * = NULL) const;
    00071
    00072 #if QT_VERSION < 0x040000
    00073     static QwtPolygon translate(const QWMatrix &, const QwtPolygon &);
    00074     static QRect translate(const QWMatrix &, const QRect &);
    00075 #else
    00076     static QwtPolygon translate(const QMatrix &, const QwtPolygon &);
    00077     static QRect translate(const QMatrix &, const QRect &);
    00078 #endif
    00079
    00080 private:
    00081     double d_screenToLayoutX;
    00082     double d_screenToLayoutY;
    00083
    00084     double d_deviceToLayoutX;
    00085     double d_deviceToLayoutY;
    00086 };
    00087
    00088 inline bool QwtMetricsMap::isIdentity() const
    00089 {
    00090     return d_deviceToLayoutX == 1.0 && d_deviceToLayoutY == 1.0;
    00091 }
    00092
    00093 inline int QwtMetricsMap::layoutToDeviceX(int x) const
    00094 {
    00095     return qRound(x / d_deviceToLayoutX);
    00096 }
    00097
    00098 inline int QwtMetricsMap::deviceToLayoutX(int x) const
    00099 {
    00100     return qRound(x * d_deviceToLayoutX);
    00101 }
    00102
    00103 inline int QwtMetricsMap::screenToLayoutX(int x) const
    00104 {
    00105     return qRound(x * d_screenToLayoutX);
    00106 }
    00107
    00108 inline int QwtMetricsMap::layoutToScreenX(int x) const
    00109 {
    00110     return qRound(x / d_screenToLayoutX);
    00111 }
    00112
    00113 inline int QwtMetricsMap::layoutToDeviceY(int y) const
    00114 {
    00115     return qRound(y / d_deviceToLayoutY);
    00116 }
    00117
    00118 inline int QwtMetricsMap::deviceToLayoutY(int y) const
    00119 {
    00120     return qRound(y * d_deviceToLayoutY);
    00121 }
    00122
    00123 inline int QwtMetricsMap::screenToLayoutY(int y) const
    00124 {
    00125     return qRound(y * d_screenToLayoutY);
    00126 }
    00127
    00128 inline int QwtMetricsMap::layoutToScreenY(int y) const
    00129 {
    00130     return qRound(y / d_screenToLayoutY);
    00131 }
    00132
    00133 inline QSize QwtMetricsMap::layoutToDevice(const QSize &size) const
    00134 {
    00135     return QSize(layoutToDeviceX(size.width()),
    00136         layoutToDeviceY(size.height()));
    00137 }
    00138
    00139 inline QSize QwtMetricsMap::deviceToLayout(const QSize &size) const
    00140 {
    00141     return QSize(deviceToLayoutX(size.width()),
    00142         deviceToLayoutY(size.height()));
    00143 }
    00144
    00145 inline QSize QwtMetricsMap::screenToLayout(const QSize &size) const
    00146 {
    00147     return QSize(screenToLayoutX(size.width()),
    00148         screenToLayoutY(size.height()));
    00149 }
    00150
    00151 inline QSize QwtMetricsMap::layoutToScreen(const QSize &size) const
    00152 {
    00153     return QSize(layoutToScreenX(size.width()),
    00154         layoutToScreenY(size.height()));
    00155 }
    00156
    00157 #endif