Public Member Functions |
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QPoint | deviceToLayout (const QPoint &, const QPainter *=NULL) const |
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QSize | deviceToLayout (const QSize &) const |
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QRect | deviceToLayout (const QRect &, const QPainter *=NULL) const |
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QwtPolygon | deviceToLayout (const QwtPolygon &, const QPainter *=NULL) const |
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int | deviceToLayoutX (int x) const |
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int | deviceToLayoutY (int y) const |
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bool | isIdentity () const |
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QPoint | layoutToDevice (const QPoint &, const QPainter *=NULL) const |
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QSize | layoutToDevice (const QSize &) const |
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QRect | layoutToDevice (const QRect &, const QPainter *=NULL) const |
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QwtPolygon | layoutToDevice (const QwtPolygon &, const QPainter *=NULL) const |
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int | layoutToDeviceX (int x) const |
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int | layoutToDeviceY (int y) const |
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QPoint | layoutToScreen (const QPoint &point) const |
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QSize | layoutToScreen (const QSize &) const |
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QRect | layoutToScreen (const QRect &) const |
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int | layoutToScreenX (int x) const |
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int | layoutToScreenY (int y) const |
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QPoint | screenToLayout (const QPoint &) const |
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QSize | screenToLayout (const QSize &) const |
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QRect | screenToLayout (const QRect &) const |
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int | screenToLayoutX (int x) const |
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int | screenToLayoutY (int y) const |
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void | setMetrics (const QPaintDevice *layoutMetrics, const QPaintDevice *deviceMetrics) |
A Map to translate between layout, screen and paint device metrics.
Qt3 supports painting in integer coordinates only. Therefore it is not possible to scale the layout in screen coordinates to layouts in higher resolutions ( f.e printing ) without losing the higher precision. QwtMetricsMap is used to incorporate the various widget attributes ( always in screen resolution ) into the layout/printing code of QwtPlot.
Qt4 is able to paint floating point based coordinates, what makes it possible always to render in screen coordinates ( with a common scale factor ). QwtMetricsMap will be obsolete as soon as Qt3 support has been dropped ( Qwt 6.x ).
