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The QLine class provides a two-dimensional vector using integer precision. More...

#include <QLine>

**QLine**()- QPoint
**p1**() const - QPoint
**p2**() const - int
**x1**() const - int
**x2**() const - int
**y1**() const - int
**y2**() const - int
**dx**() const - int
**dy**() const - bool
**isNull**() const - void
**translate**( const QPoint &*offset*) - bool
**operator!=**( const QLine &*line*) const - bool
**operator==**( const QLine &*line*) const

The QLine class provides a two-dimensional vector using integer precision.

A QLine describes a finite length line (or a line segment) on a two-dimensional surface. The start and end points of the line are specified using integer point accuracy for coordinates. Use the QLineF constructor to retrieve a floating point copy.

The positions of the line's start and end points can be retrieved using the p1(), x1(), y1(), p2(), x2(), and y2() functions. The dx() and dy() functions return the horizontal and vertical components of the line. Use isNull() to determine whether the QLine represents a valid line or a null line.

Finally, the line can be translated a given offset using the translate() function.

See also QLineF, QPolygon, and QRect.

Constructs a null line.

Constructs a line object that represents the line between *p1* and *p2*.

Constructs a line object that represents the line between (*x1*, *y1*) and (*x2*, *y2*).

Returns the line's start point.

See also x1(), y1(), and p2().

Returns the line's end point.

See also x2(), y2(), and p1().

Returns the x-coordinate of the line's start point.

See also p1().

Returns the x-coordinate of the line's end point.

See also p2().

Returns the y-coordinate of the line's start point.

See also p1().

Returns the y-coordinate of the line's end point.

See also p2().

Returns the horizontal component of the line's vector.

See also dy().

Returns the vertical component of the line's vector.

See also dx().

Returns true if the line is not set up with valid start and end point; otherwise returns false.

Translates this line by the given *offset*.

This is an overloaded member function, provided for convenience.

Translates this line the distance specified by *dx* and *dy*.

Returns true if the given *line* is not the same as *this* line.

A line is different from another line if any of their start or end points differ, or the internal order of the points is different.

Returns true if the given *line* is the same as *this* line.

A line is identical to another line if the start and end points are identical, and the internal order of the points is the same.

This is an overloaded member function, provided for convenience.

Writes the given *line* to the given *stream* and returns a reference to the stream.

See also Format of the QDataStream Operators.

This is an overloaded member function, provided for convenience.

Reads a line from the given *stream* into the given *line* and returns a reference to the stream.

See also Format of the QDataStream Operators.

Copyright © 2008 Trolltech | Trademarks | Qt 4.3.5 |