Quantum GIS API Documentation  1.7.4
Public Member Functions | Protected Member Functions | Private Member Functions | Static Private Member Functions | Private Attributes
QgsRubberBand Class Reference

A class for drawing transient features (e.g. More...

#include <qgsrubberband.h>

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List of all members.

Public Member Functions

 QgsRubberBand (QgsMapCanvas *mapCanvas, bool isPolygon=false)
 ~QgsRubberBand ()
void setColor (const QColor &color)
void setWidth (int width)
void reset (bool isPolygon=false)
void addPoint (const QgsPoint &p, bool update=true, int geometryIndex=0)
 Add point to rubberband and update canvas If adding more points consider using update=false for better performance geometryIndex is the index of the feature part (in case of multipart geometries)
void removeLastPoint (int geometryIndex=0)
 Removes the last point. Most useful in connection with undo operations.
void movePoint (const QgsPoint &p, int geometryIndex=0)
void movePoint (int index, const QgsPoint &p, int geometryIndex=0)
 Moves the rubber band point specified by index.
void setToGeometry (QgsGeometry *geom, QgsVectorLayer *layer)
 Sets this rubber band to the geometry of an existing feature.
void setToCanvasRectangle (const QRect &rect)
 Sets this rubber band to a map canvas rectangle.
void addGeometry (QgsGeometry *geom, QgsVectorLayer *layer)
 Add the geometry of an existing feature to a rubberband This is useful for multi feature highlighting.
void setTranslationOffset (double dx, double dy)
 Adds translation to original coordinates (all in map coordinates)
int size () const
 Returns number of geometries added in 1.5.
int numberOfVertices () const
 Returns count of vertices in all lists of mPoint.
const QgsPointgetPoint (int i, int j=0) const
 Return vertex.
QgsGeometryasGeometry ()
 Returns the rubberband as a Geometry.

Protected Member Functions

virtual void paint (QPainter *p)
void updateRect ()
 recalculates needed rectangle

Private Member Functions

 QgsRubberBand ()

Static Private Member Functions

static QgsPolyline getPolyline (const QList< QgsPoint > &points)

Private Attributes

QBrush mBrush
QPen mPen
QList< QList< QgsPoint > > mPoints
 Nested lists used for multitypes.
bool mIsPolygon
double mTranslationOffsetX
double mTranslationOffsetY

Detailed Description

A class for drawing transient features (e.g.

The QgsRubberBand class provides a transparent overlay widget for tracking the mouse while drawing polylines or polygons.

digitising lines) on the map.

Definition at line 32 of file qgsrubberband.h.


Constructor & Destructor Documentation

QgsRubberBand::QgsRubberBand ( QgsMapCanvas mapCanvas,
bool  isPolygon = false 
)

Definition at line 31 of file qgsrubberband.cpp.

References reset(), and setColor().

Definition at line 45 of file qgsrubberband.cpp.

Definition at line 41 of file qgsrubberband.cpp.


Member Function Documentation

void QgsRubberBand::addGeometry ( QgsGeometry geom,
QgsVectorLayer layer 
)
void QgsRubberBand::addPoint ( const QgsPoint p,
bool  do_update = true,
int  geometryIndex = 0 
)

Add point to rubberband and update canvas If adding more points consider using update=false for better performance geometryIndex is the index of the feature part (in case of multipart geometries)

Add a point to the shape being created.

Definition at line 82 of file qgsrubberband.cpp.

References mPoints, size(), and updateRect().

Referenced by addGeometry(), and setToCanvasRectangle().

Returns the rubberband as a Geometry.

added in 1.6

Definition at line 459 of file qgsrubberband.cpp.

References QgsGeometry::fromMultiPolyline(), QgsGeometry::fromPolygon(), QgsGeometry::fromPolyline(), getPolyline(), mIsPolygon, and mPoints.

const QgsPoint * QgsRubberBand::getPoint ( int  i,
int  j = 0 
) const

Return vertex.

Definition at line 451 of file qgsrubberband.cpp.

References mPoints.

QgsPolyline QgsRubberBand::getPolyline ( const QList< QgsPoint > &  points) [static, private]

Definition at line 495 of file qgsrubberband.cpp.

Referenced by asGeometry().

void QgsRubberBand::movePoint ( const QgsPoint p,
int  geometryIndex = 0 
)

Update the line between the last added point and the mouse position.

Definition at line 136 of file qgsrubberband.cpp.

References mPoints, and updateRect().

void QgsRubberBand::movePoint ( int  index,
const QgsPoint p,
int  geometryIndex = 0 
)

Moves the rubber band point specified by index.

Note that if the rubber band is not used to track the last mouse position, the first point of the rubber band has two vertices

Definition at line 154 of file qgsrubberband.cpp.

References mPoints, and updateRect().

Returns count of vertices in all lists of mPoint.

Definition at line 436 of file qgsrubberband.cpp.

References mPoints.

void QgsRubberBand::paint ( QPainter *  p) [protected, virtual]

Draw the shape in response to an update event.

Implements QgsMapCanvasItem.

Definition at line 365 of file qgsrubberband.cpp.

References mBrush, mIsPolygon, mPen, mPoints, mTranslationOffsetX, mTranslationOffsetY, and QgsMapCanvasItem::toCanvasCoordinates().

void QgsRubberBand::removeLastPoint ( int  geometryIndex = 0)

Removes the last point. Most useful in connection with undo operations.

Definition at line 117 of file qgsrubberband.cpp.

References mPoints, size(), and updateRect().

void QgsRubberBand::reset ( bool  isPolygon = false)

Remove all points from the shape being created.

Definition at line 71 of file qgsrubberband.cpp.

References mIsPolygon, mPoints, and updateRect().

Referenced by QgsRubberBand(), setToCanvasRectangle(), and setToGeometry().

void QgsRubberBand::setColor ( const QColor &  color)

Set the outline and fill color.

Definition at line 52 of file qgsrubberband.cpp.

References mBrush, and mPen.

Referenced by QgsRubberBand().

void QgsRubberBand::setToCanvasRectangle ( const QRect &  rect)

Sets this rubber band to a map canvas rectangle.

Parameters:
rectrectangle in canvas coordinates
Note:
added in version 1.7

Definition at line 344 of file qgsrubberband.cpp.

References addPoint(), QgsMapCanvas::getCoordinateTransform(), QgsMapCanvasItem::mMapCanvas, reset(), QgsMapToPixel::toMapCoordinates(), QgsPoint::x(), and QgsPoint::y().

Referenced by QgsMapToolZoom::canvasMoveEvent().

Sets this rubber band to the geometry of an existing feature.

This is useful for feature highlighting.

Parameters:
geomthe geometry object
layerthe layer containing the feature, used for coord transformation to map crs. In case of 0 pointer, the coordinates are not going to be transformed.

Definition at line 172 of file qgsrubberband.cpp.

References addGeometry(), mIsPolygon, and reset().

void QgsRubberBand::setTranslationOffset ( double  dx,
double  dy 
)

Adds translation to original coordinates (all in map coordinates)

Definition at line 424 of file qgsrubberband.cpp.

References mTranslationOffsetX, mTranslationOffsetY, and updateRect().

void QgsRubberBand::setWidth ( int  width)

Set the outline width.

Definition at line 63 of file qgsrubberband.cpp.

References mPen.

int QgsRubberBand::size ( void  ) const

Returns number of geometries added in 1.5.

Definition at line 431 of file qgsrubberband.cpp.

References mPoints.

Referenced by addPoint(), and removeLastPoint().

void QgsRubberBand::updateRect ( ) [protected]

Member Data Documentation

QBrush QgsRubberBand::mBrush [private]

Definition at line 102 of file qgsrubberband.h.

Referenced by paint(), and setColor().

bool QgsRubberBand::mIsPolygon [private]

Definition at line 107 of file qgsrubberband.h.

Referenced by addGeometry(), asGeometry(), paint(), reset(), and setToGeometry().

QPen QgsRubberBand::mPen [private]

Definition at line 103 of file qgsrubberband.h.

Referenced by paint(), setColor(), and setWidth().

QList< QList <QgsPoint> > QgsRubberBand::mPoints [private]

Nested lists used for multitypes.

Definition at line 106 of file qgsrubberband.h.

Referenced by addGeometry(), addPoint(), asGeometry(), getPoint(), movePoint(), numberOfVertices(), paint(), removeLastPoint(), reset(), size(), and updateRect().

Definition at line 108 of file qgsrubberband.h.

Referenced by paint(), setTranslationOffset(), and updateRect().

Definition at line 109 of file qgsrubberband.h.

Referenced by paint(), setTranslationOffset(), and updateRect().


The documentation for this class was generated from the following files:
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