/usr/include/qgis/qgscomposerruler.h is in libqgis-dev 2.18.17+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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qgscomposerruler.h
---------------------
begin : January 2013
copyright : (C) 2013 by Marco Hugentobler
email : marco dot hugentobler at sourcepole dot ch
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef QGSCOMPOSERRULER_H
#define QGSCOMPOSERRULER_H
#include "qgscomposeritem.h"
#include <QWidget>
class QgsComposition;
class QGraphicsLineItem;
/** \ingroup gui
* A class to show paper scale and the current cursor position
*/
class GUI_EXPORT QgsComposerRuler: public QWidget
{
Q_OBJECT
public:
enum Direction
{
Horizontal = 0,
Vertical
};
QgsComposerRuler( QgsComposerRuler::Direction d );
~QgsComposerRuler();
QSize minimumSizeHint() const override;
void setSceneTransform( const QTransform& transform );
void updateMarker( QPointF pos ) { mMarkerPos = pos; repaint(); }
void setComposition( QgsComposition* c ) { mComposition = c; }
QgsComposition* composition() { return mComposition; }
int rulerSize() { return mRulerMinSize; }
protected:
void paintEvent( QPaintEvent* event ) override;
void mouseMoveEvent( QMouseEvent* event ) override;
void mouseReleaseEvent( QMouseEvent* event ) override;
void mousePressEvent( QMouseEvent* event ) override;
private:
static const int validScaleMultiples[];
static const int validScaleMagnitudes[];
Direction mDirection;
QTransform mTransform;
QPointF mMarkerPos;
QgsComposition* mComposition; //reference to composition for paper size, nPages
QGraphicsLineItem* mLineSnapItem;
//items snapped to the current snap line
QList< QPair< QgsComposerItem*, QgsComposerItem::ItemPositionMode > > mSnappedItems;
QFont * mRulerFont;
QFontMetrics * mRulerFontMetrics;
double mScaleMinPixelsWidth;
int mRulerMinSize;
int mMinPixelsPerDivision;
int mPixelsBetweenLineAndText;
int mTextBaseline;
int mMinSpacingVerticalLabels;
void setSnapLinePosition( QPointF pos );
//calculate optimum labeled units for ruler so that labels are a good distance apart
int optimumScale( double minPixelDiff, int &magnitude, int &multiple );
//calculate number of small divisions for each ruler unit, ensuring that they
//are sufficiently spaced
int optimumNumberDivisions( double rulerScale, int scaleMultiple );
//draws vertical text on a painter
void drawRotatedText( QPainter *painter, QPointF pos, const QString &text );
/* Draws small ruler divisions
* Starting at startPos in mm, for numDivisions divisions, with major division spacing of rulerScale (in mm)
* Stop drawing if position exceeds maxPos
*/
void drawSmallDivisions( QPainter *painter, double startPos, int numDivisions, double rulerScale, double maxPos = 0 );
//draw current marker pos on ruler
void drawMarkerPos( QPainter *painter );
signals:
/** Is emitted when mouse cursor coordinates change*/
void cursorPosChanged( QPointF );
};
#endif // QGSCOMPOSERRULER_H
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