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The QPolygon class provides a vector of points. More...
#include <QPolygon>
Inherits QVector<QPointF>.
Note: All the functions in this class are reentrant.
The QPolygon class provides a vector of points.
A QPolygon is a QVector<QPoint>. It is implicitly shared. In addition to the functions provided by QVector, QPolygon provides some point-specific functions.
For convenient reading and writing of the point data use setPoints(), putPoints(), point(), and setPoint().
For geometry operations use boundingRect() and translate(). There is also the QMatrix::map() function for more general transformations of QPolygons. You can also create arcs and ellipses with makeArc() and makeEllipse().
Among others, QPolygon is used by QPainter::drawLineSegments(), QPainter::drawPolyline(), QPainter::drawPolygon() and QPainter::drawCubicBezier().
See also QPainter, QMatrix, and QVector.
Constructs a polygon with no points.
See also QVector::isEmpty().
Constructs a polygon with size points. Makes a polygon with no points if size == 0.
See also QVector::isEmpty().
Copy constructor. Constructs a copy of the other polygon.
Constructs a polygon from the given vector of points.
Constructs a closed polygon from the rectangle specified by rect.
The point array just contains the four vertices of the rectangle in clockwise order starting and ending with the top-left vertex.
Destroys the point array.
Returns the bounding rectangle of the polygon, or QRect(0,0,0,0) if the array is empty.
Constructs a polygon from the given point array. The polygon will not be closed.
See also toPointArray().
Returns true if the polygon is closed; otherwise returns false.
Returns the polygons vertices as a list of points.
See also fromPointArray().
Translates all points in the polygon by the given offset.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Translates all points in the polygon by (dx, dy).
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Writes the point array, a to the stream s and returns a reference to the stream.
See also Format of the QDataStream operators.
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
Reads a point array, a from the stream s and returns a reference to the stream.
See also Format of the QDataStream operators.
Copyright © 2004 Trolltech. | Trademarks | Qt 4.0.0-tp2 |