Draw images on a QwtPlot. More...

#include <ImageMarker.h>

Inheritance diagram for ImageMarker:

Public Member Functions
double	bottom ()
virtual QwtDoubleRect	boundingRect () const
	Return bounding rectangle in plot coordinates.
QString	fileName ()
	Return d_file_name.
	ImageMarker (const QString &fn)
	Construct an image marker from a file name.
QPoint	origin () const
	Return position in paint coordinates.
QPixmap	pixmap () const
	Return the pixmap to be drawn, d_pic.
QRect	rect () const
	Return bounding rectangle in paint coordinates.
double	right ()
void	setBoundingRect (double left, double top, double right, double bottom)
	Set position (xValue() and yValue()), right and bottom values giving everything in plot coordinates.
void	setFileName (const QString &fn)
	Set d_file_name.
void	setOrigin (const QPoint &p)
	Set QwtPlotMarker::value() in paint coordinates.
void	setRect (int x, int y, int w, int h)
	Set value (position) and d_size, giving everything in paint coordinates.
void	setSize (const QSize &size)
	Set d_size.
void	setSize (int w, int h)
	Set d_size. Provided for convenience in scripts.
QSize	size ()
	Return d_size.
void	updateBoundingRect ()
Public Member Functions inherited from PlotEnrichement
	PlotEnrichement ()

Private Member Functions
void	draw (QPainter *p, const QwtScaleMap &xMap, const QwtScaleMap &yMap, const QRect &r) const
	Does the actual drawing; see QwtPlotItem::draw.

Private Attributes
QString	d_file_name
	The file from which the image was loaded.
QPixmap	d_pic
	The pixmap to be drawn.
QPoint	d_pos
	The position in paint coordiantes.
QSize	d_size
	The size (in paint coordinates) to which d_pic will be scaled in draw().
double	d_x_right
	The right side position in scale coordinates.
double	d_y_bottom
	The bottom side position in scale coordinates.

Detailed Description

Draw images on a QwtPlot.

ImageMarker draws d_pic at the position specified by d_pos, scaled to d_size. d_file_name isn't used internally, but only provided to help Graph manage save/restore.

Future Plans

Add a QwtPlotItem subclass (PlotEnrichment ?) and make ImageMarker, Legend and ArrowMarker subclasses of that. These (usually) don't really mark a specific point in a plot and they don't use the symbol/label functionality of QwtPlotMarker. Instead, it would make sense to provide a unified move/resize (or even general affine transformations via QMatrix) interface and support for positioning them either at fixed plot coordinates (like QwtPlotMarker) or at a fixed drawing position within a QwtPlot (like a QWidget child); leaving the choice of positioning policy to the user. If PlotEnrichment (ideas for a better name?) inherits from both QWidget and QwtPlotItem (which is luckily no QObject) and provides a unified drawing framework, its instances could be added directly to MultiLayer without the need for a dummy Graph in between. Could also help to avoid the hack in MultiLayer::updateMarkersBoundingRect().

Following the above thoughts, it might help clarify the purpose of ImageMarker, Legend and ArrowMarker if they are renamed according to the new superclasse's name (e.g. ImageEnrichment, TextEnrichment and LineEnrichment).

See the documentation of SelectionMoveResizer for other advantages of this approach.