QLine Class ReferenceThe QLine class provides a two-dimensional vector using integer precision. Далее... #include <QLine>
Открытые функции
Связанные нечлены класса
Подробное описаниеThe 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. Описание функций-членовQLine::QLine ()Constructs a null line. QLine::QLine ( const QPoint & p1, const QPoint & p2 )Constructs a line object that represents the line between p1 and p2. QLine::QLine ( int x1, int y1, int x2, int y2 )Constructs a line object that represents the line between (x1, y1) and (x2, y2). QPoint QLine::p1 () constReturns the line's start point. See also setP1(), x1(), y1(), and p2(). QPoint QLine::p2 () constReturns the line's end point. See also setP2(), x2(), y2(), and p1(). int QLine::x1 () constReturns the x-coordinate of the line's start point. See also p1(). int QLine::x2 () constReturns the x-coordinate of the line's end point. See also p2(). int QLine::y1 () constReturns the y-coordinate of the line's start point. See also p1(). int QLine::y2 () constReturns the y-coordinate of the line's end point. See also p2(). int QLine::dx () constReturns the horizontal component of the line's vector. See also dy(). int QLine::dy () constReturns the vertical component of the line's vector. See also dx(). bool QLine::isNull () constReturns true if the line is not set up with valid start and end point; otherwise returns false. void QLine::setP1 ( const QPoint & p1 )Sets the starting point of this line to p1. Эта функция была введена в Qt 4.4. void QLine::setP2 ( const QPoint & p2 )Sets the end point of this line to p2. Эта функция была введена в Qt 4.4. void QLine::setLine ( int x1, int y1, int x2, int y2 )Sets this line to the start in x1, y1 and end in x2, y2. Эта функция была введена в Qt 4.4. See also setP1(), setP2(), p1(), and p2(). void QLine::setPoints ( const QPoint & p1, const QPoint & p2 )Sets the start point of this line to p1 and the end point of this line to p2. Эта функция была введена в Qt 4.4. See also setP1(), setP2(), p1(), and p2(). void QLine::translate ( const QPoint & offset )Translates this line by the given offset. void QLine::translate ( int dx, int dy )Это перегруженная функция. Translates this line the distance specified by dx and dy. QLine QLine::translated ( const QPoint & offset ) constReturns this line translated by the given offset. Эта функция была введена в Qt 4.4. QLine QLine::translated ( int dx, int dy ) constЭто перегруженная функция. Returns this line translated the distance specified by dx and dy. Эта функция была введена в Qt 4.4. bool QLine::operator!= ( const QLine & line ) constReturns 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. bool QLine::operator== ( const QLine & line ) constReturns 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. Связанные нечлены классаQDataStream & operator<< ( QDataStream & stream, const QLine & line )Writes the given line to the given stream and returns a reference to the stream. Смотрите также Преобразование типов данных Qt в последовательный вид. QDataStream & operator>> ( QDataStream & stream, QLine & line )Reads a line from the given stream into the given line and returns a reference to the stream. Смотрите также Преобразование типов данных Qt в последовательный вид. |
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