彻底改版2.0

third/3rd_qwt/qwt_point_mapper.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_POINT_MAPPER_H
+#define QWT_POINT_MAPPER_H
+
+#include "qwt_global.h"
+#include "qwt_series_data.h"
+#include <qimage.h>
+
+class QwtScaleMap;
+class QPolygonF;
+class QPolygon;
+
+/*!
+  \brief A helper class for translating a series of points
+
+  QwtPointMapper is a collection of methods and optimizations
+  for translating a series of points into paint device coordinates.
+  It is used by QwtPlotCurve but might also be useful for
+  similar plot items displaying a QwtSeriesData<QPointF>.
+ */
+class QWT_EXPORT QwtPointMapper
+{
+public:
+    /*!
+      \brief Flags affecting the transformation process
+      \sa setFlag(), setFlags()
+     */
+    enum TransformationFlag
+    {
+        //! Round points to integer values
+        RoundPoints = 0x01,
+
+        /*!
+          Try to remove points, that are translated to the
+          same position.
+         */
+        WeedOutPoints = 0x02
+    };
+
+    /*!
+      \brief Flags affecting the transformation process
+      \sa setFlag(), setFlags()
+     */
+    typedef QFlags<TransformationFlag> TransformationFlags;
+
+    QwtPointMapper();
+    ~QwtPointMapper();
+
+    void setFlags( TransformationFlags );
+    TransformationFlags flags() const;
+
+    void setFlag( TransformationFlag, bool on = true );
+    bool testFlag( TransformationFlag ) const;
+
+    void setBoundingRect( const QRectF & );
+    QRectF boundingRect() const;
+
+    QPolygonF toPolygonF( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QwtSeriesData<QPointF> *series, int from, int to ) const;
+
+    QPolygon toPolygon( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QwtSeriesData<QPointF> *series, int from, int to ) const;
+
+    QPolygon toPoints( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QwtSeriesData<QPointF> *series, int from, int to ) const;
+
+    QPolygonF toPointsF( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QwtSeriesData<QPointF> *series, int from, int to ) const;
+
+    QImage toImage( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QwtSeriesData<QPointF> *series, int from, int to,
+        const QPen &, bool antialiased, uint numThreads ) const;
+
+private:
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPointMapper::TransformationFlags )
+
+#endif