| 头： | #include <Q3PointArray> |
| 继承： | QPolygon |
| Q3PointArray () | |
| Q3PointArray (const QRect & r , bool closed = false) | |
| Q3PointArray (const QPolygon & other ) | |
| Q3PointArray | copy () const |
| Q3PointArray | cubicBezier () const |
| bool | isNull () |
| void | makeArc (int x , int y , int w , int h , int a1 , int a2 ) |
| void | makeArc (int x , int y , int w , int h , int a1 , int a2 , const QMatrix & xf ) |
| void | makeEllipse (int x , int y , int w , int h ) |
The Q3PointArray class provides an array of points.
Q3PointArray
是
QPolygon
subclass that provides functions to make it more source compatible with the
QPointArray
class in Qt 3.
In Qt 4, we recommend that you use QPainterPath for representing arcs, ellipses, and Bezier curves, rather than QPolygon .
构造空的 Q3PointArray .
Constructs a point array from the rectangle r .
若 closed is false, then the point array just contains the following four points of the rectangle ordered clockwise. The bottom-right point is located at (r.x() + r.width(), r.y() + r.height()).
构造副本为 other .
Returns a copy of this Q3PointArray .
Returns the Bezier points for the four control points in this array.
返回 isEmpty ()。使用 isEmpty () 代替。
Sets the points of the array to those describing an arc of an ellipse with size, width w 按高度 h , and position ( x , y ), starting from angle a1 and spanning by angle a2 . The resulting array has sufficient resolution for pixel accuracy (see the overloaded function which takes an additional QMatrix parameter).
Angles are specified in 16ths of a degree, i.e. a full circle equals 5760 (16*360). Positive values mean counter-clockwise, whereas negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.
这是重载函数。
Sets the points of the array to those describing an arc of an ellipse with width w 和高度 h and position ( x , y ), starting from angle a1 , and spanning angle by a2 , and transformed by the matrix xf . The resulting array has sufficient resolution for pixel accuracy.
Angles are specified in 16ths of a degree, i.e. a full circle equals 5760 (16 * 360). Positive values mean counter-clockwise, whereas negative values mean the clockwise direction. Zero degrees is at the 3 o'clock position.
Sets the points of the array to those describing an ellipse with size, width w 按高度 h , and position ( x , y ).
The returned array has sufficient resolution for use as pixels.
