qwt_plot_transform.h

/******************************************************************************
 * 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_TRANSFORM_H
#define QWT_PLOT_TRANSFORM_H
 
#include "qwt_global.h"
#include "qwt_axis_id.h"
 
#include <qpoint.h>
#include <qrect.h>
 
class QPainterPath;
class QwtPlot;
 
class QWT_EXPORT QwtPlotTransform
{
public:
    // ---- Cross-axis transformation ----
 
    // Transform a point from one axis pair to another (same screen position)
    static QPointF
    transformPoint(const QwtPlot* plot, const QPointF& point, QwtAxisId fromX, QwtAxisId fromY, QwtAxisId toX, QwtAxisId toY);
 
    // Transform a path from one axis pair to another
    static QPainterPath
    transformPath(const QwtPlot* plot, const QPainterPath& path, QwtAxisId fromX, QwtAxisId fromY, QwtAxisId toX, QwtAxisId toY);
 
    // ---- Screen / data coordinate conversion ----
 
    // Convert screen position to data coordinates
    static QPointF toPlotPoint(const QwtPlot* plot,
                               const QPointF& screenPos,
                               QwtAxisId xAxis = QwtAxis::XBottom,
                               QwtAxisId yAxis = QwtAxis::YLeft);
 
    // Convert data coordinates to screen position
    static QPointF toScreenPoint(const QwtPlot* plot,
                                 const QPointF& plotPoint,
                                 QwtAxisId xAxis = QwtAxis::XBottom,
                                 QwtAxisId yAxis = QwtAxis::YLeft);
 
    // ---- Pixel offset ----
 
    // Compute the data-coordinate offset corresponding to 1 pixel
    static QPointF onePixelOffset(const QwtPlot* plot, QwtAxisId xAxis = QwtAxis::XBottom, QwtAxisId yAxis = QwtAxis::YLeft);
 
    // ---- Visible range ----
 
    // Get the currently visible data range
    static QRectF visibleRange(const QwtPlot* plot, QwtAxisId xAxis = QwtAxis::XBottom, QwtAxisId yAxis = QwtAxis::YLeft);
 
    // ---- Total data range ----
 
    // Get the union of all data item bounding rectangles
    static QRectF totalDataRange(const QwtPlot* plot, bool onlyVisible = true);
};
 
#endif  // QWT_PLOT_TRANSFORM_H