The QPointArray class provides an array of points. More...
#include <qpointarray.h>
Inherits QArray.
QPointArray is used by the QPainter to draw line segments, polylines, polygons and Bezier curves.
The QPointArray is not an array of QPoint, instead it contains a platform dependent point type to make the QPainter functions more efficient (no conversion needed). On the other hand, QPointArray has member functions that operate on QPoint to make programming easier.
Note that since this class is a QArray, it is explicitly shared and works with shallow copies by default.
Examples: desktop/desktop.cpp drawdemo/drawdemo.cpp picture/picture.cpp aclock/aclock.cpp
Constructs a null point array.
See also: isNull().
Constructs a point array from the rectangle r.
If closed is FALSE, then the point array will contain the following four points (in the listed order):
If closed is TRUE, then a fifth point is set to r.topLeft() to close the point array.
Constructs a shallow copy of the point array a.
See also: copy().
Constructs a point array with nPoints points, taken from the points array.
Equivalent to setPoints(nPoints,points).
Constructs a point array with room for size points. Makes a null array if size == 0.
See also: resize() and isNull().
Returns the point at position index in the array.
See also: operator[].
Returns the bounding rectangle of the points in the array, or QRect(0,0,0,0) if the array is empty.
Creates a deep copy of the array.
Fills the point array with the point p. If size is specified as different from -1, then the array will be resized before filled.
Returns TRUE if successful, or FALSE if the memory cannot be allocated (only when size != -1).
See also: resize().
Sets the points of the array to those describing an arc of an ellipse with size w by h and position (x, y ), starting from angle \a1, spanning a2. Angles are specified in 16ths of a degree, i.e. a full circle equals 5760 (16*360). Positive values mean counter-clockwise while negative values mean clockwise direction. Zero degrees is at the 3'o clock position.
Sets the points of the array to those describing an ellipse with size w by h and position (x, y ).
Assigns a shallow copy of a to this point array and returns a reference to this point array.
Equivalent to assign( a ).
See also: copy().
Returns the point at position index in the array.
Returns the point at position index in the array.
Returns a reference to the point at position index in the array.
Returns a reference to the point at position index in the array.
Returns the point at position index in the array.
Returns the point at position index in the array in *x and *y.
Examples: drawdemo/drawdemo.cpp
Copies nPoints points from the points array into this point array.
Will resize this point array if index+nPoints exceeds
the size of the array.
Returns TRUE if successful, or FALSE if the array could not be resized.
Example:
QPointArray a( 1 );
a[0] = QPoint( 1, 2 );
static QCOORD points[] = { 3,4, 5,6 };
a.putPoints( 1, 2, points );
The example code creates an array with three points: (1,2), (3,4) and (5,6).
This function differs from setPoints() in that it does not resize the array unless the array size is exceeded.
See also: resize() and setPoints().
Copies nPoints points from the variable argument list into this point
array. Will resize this point array if index+nPoints exceeds
the size of the array.
Returns TRUE if successful, or FALSE if the array could not be resized.
Example:
QPointArray a( 1 );
a[0] = QPoint( 1, 2 );
a.putPoints( 1, 2, 3,4, 5,6 );
The example code creates an array with two points (1,2), (3,4) and (5,6).
This function differs from setPoints() because it does not resize the array unless the array size is exceeded.
See also: resize() and setPoints().
Returns the Bezier points for the four control points in this array.
Examples: drawdemo/drawdemo.cpp
Equivalent to setPoint( i, p.x(), p.y() ).
Sets the point at position index in the array to (x,y).
Examples: drawdemo/drawdemo.cpp
Resizes the array to nPoints and sets the points in the array to the values taken from points.
Returns TRUE if successful, or FALSE if the array could not be resized.
Example:
static QCOORD points[] = { 1,2, 3,4 };
QPointArray a;
a.setPoints( 2, points );
The example code creates an array with two points (1,2) and (3,4).
See also: resize() and putPoints().
Examples: aclock/aclock.cpp
Resizes the array to nPoints and sets the points in the array to the values taken from the variable argument list.
Returns TRUE if successful, or FALSE if the array could not be resized.
Example:
QPointArray a;
a.setPoints( 2, 1,2, 3,4 );
The example code creates an array with two points (1,2) and (3,4).
See also: resize() and putPoints().
Translates all points in the array (dx,dy).
Writes a point array to the stream and returns a reference to the stream.
The serialization format is:
Reads a point array from the stream and returns a reference to the stream.
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| Copyright © 1998 Troll Tech | Trademarks | Qt version 1.42
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