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< td align = "right" valign = "center" > < img src = "logo32.png" align = "right" width = "64" height = "32" border = "0" > < / td > < / tr > < / table > < h1 align = center > TQRegion Class Reference< / h1 >
< p > The TQRegion class specifies a clip region for a painter.
< a href = "#details" > More...< / a >
< p > < tt > #include < < a href = "qregion-h.html" > ntqregion.h< / a > > < / tt >
< p > < a href = "qregion-members.html" > List of all member functions.< / a >
< h2 > Public Members< / h2 >
< ul >
< li class = fn > enum < a href = "#RegionType-enum" > < b > RegionType< / b > < / a > { Rectangle, Ellipse }< / li >
< li class = fn > < a href = "#TQRegion" > < b > TQRegion< / b > < / a > ()< / li >
< li class = fn > < a href = "#TQRegion-2" > < b > TQRegion< / b > < / a > ( int x, int y, int w, int h, RegionType t = Rectangle )< / li >
< li class = fn > < a href = "#TQRegion-3" > < b > TQRegion< / b > < / a > ( const TQRect & r, RegionType t = Rectangle )< / li >
< li class = fn > < a href = "#TQRegion-4" > < b > TQRegion< / b > < / a > ( const TQPointArray & a, bool winding = FALSE )< / li >
< li class = fn > < a href = "#TQRegion-5" > < b > TQRegion< / b > < / a > ( const TQRegion & r )< / li >
< li class = fn > < a href = "#TQRegion-6" > < b > TQRegion< / b > < / a > ( const TQBitmap & bm )< / li >
< li class = fn > < a href = "#~TQRegion" > < b > ~TQRegion< / b > < / a > ()< / li >
< li class = fn > TQRegion & < a href = "#operator-eq" > < b > operator=< / b > < / a > ( const TQRegion & r )< / li >
< li class = fn > bool < a href = "#isNull" > < b > isNull< / b > < / a > () const< / li >
< li class = fn > bool < a href = "#isEmpty" > < b > isEmpty< / b > < / a > () const< / li >
< li class = fn > bool < a href = "#contains" > < b > contains< / b > < / a > ( const TQPoint & p ) const< / li >
< li class = fn > bool < a href = "#contains-2" > < b > contains< / b > < / a > ( const TQRect & r ) const< / li >
< li class = fn > void < a href = "#translate" > < b > translate< / b > < / a > ( int dx, int dy )< / li >
< li class = fn > TQRegion < a href = "#unite" > < b > unite< / b > < / a > ( const TQRegion & r ) const< / li >
< li class = fn > TQRegion < a href = "#intersect" > < b > intersect< / b > < / a > ( const TQRegion & r ) const< / li >
< li class = fn > TQRegion < a href = "#subtract" > < b > subtract< / b > < / a > ( const TQRegion & r ) const< / li >
< li class = fn > TQRegion < a href = "#eor" > < b > eor< / b > < / a > ( const TQRegion & r ) const< / li >
< li class = fn > TQRect < a href = "#boundingRect" > < b > boundingRect< / b > < / a > () const< / li >
< li class = fn > TQMemArray< TQRect> < a href = "#rects" > < b > rects< / b > < / a > () const< / li >
< li class = fn > const TQRegion < a href = "#operator|" > < b > operator|< / b > < / a > ( const TQRegion & r ) const< / li >
< li class = fn > const TQRegion < a href = "#operator+" > < b > operator+< / b > < / a > ( const TQRegion & r ) const< / li >
< li class = fn > const TQRegion < a href = "#operator-and" > < b > operator& < / b > < / a > ( const TQRegion & r ) const< / li >
< li class = fn > const TQRegion < a href = "#operator-" > < b > operator-< / b > < / a > ( const TQRegion & r ) const< / li >
< li class = fn > const TQRegion < a href = "#operator^" > < b > operator^< / b > < / a > ( const TQRegion & r ) const< / li >
< li class = fn > TQRegion & < a href = "#operator|-eq" > < b > operator|=< / b > < / a > ( const TQRegion & r )< / li >
< li class = fn > TQRegion & < a href = "#operator+-eq" > < b > operator+=< / b > < / a > ( const TQRegion & r )< / li >
< li class = fn > TQRegion & < a href = "#operator-and-eq" > < b > operator& =< / b > < / a > ( const TQRegion & r )< / li >
< li class = fn > TQRegion & < a href = "#operator--eq" > < b > operator-=< / b > < / a > ( const TQRegion & r )< / li >
< li class = fn > TQRegion & < a href = "#operator^-eq" > < b > operator^=< / b > < / a > ( const TQRegion & r )< / li >
< li class = fn > bool < a href = "#operator-eq-eq" > < b > operator==< / b > < / a > ( const TQRegion & r ) const< / li >
< li class = fn > bool < a href = "#operator!-eq" > < b > operator!=< / b > < / a > ( const TQRegion & r ) const< / li >
< li class = fn > HRGN < a href = "#handle" > < b > handle< / b > < / a > () const< / li >
< / ul >
< h2 > Related Functions< / h2 >
< ul >
< li class = fn > TQDataStream & < a href = "#operator-lt-lt" > < b > operator< < < / b > < / a > ( TQDataStream & s, const TQRegion & r )< / li >
< li class = fn > TQDataStream & < a href = "#operator-gt-gt" > < b > operator> > < / b > < / a > ( TQDataStream & s, TQRegion & r )< / li >
< / ul >
< hr > < a name = "details" > < / a > < h2 > Detailed Description< / h2 >
The TQRegion class specifies a clip region for a painter.
< p >
< p > TQRegion is used with < a href = "ntqpainter.html#setClipRegion" > TQPainter::setClipRegion< / a > () to limit the paint
area to what needs to be painted. There is also a
< a href = "tqwidget.html#repaint" > TQWidget::repaint< / a > () that takes a TQRegion parameter. TQRegion is the
best tool for reducing flicker.
< p > A region can be created from a rectangle, an ellipse, a polygon or
a bitmap. Complex regions may be created by combining simple
regions using < a href = "#unite" > unite< / a > (), < a href = "#intersect" > intersect< / a > (), < a href = "#subtract" > subtract< / a > () or < a href = "#eor" > eor< / a > () (exclusive
or). You can move a region using < a href = "#translate" > translate< / a > ().
< p > You can test whether a region < a href = "#isNull" > isNull< / a > (), < a href = "#isEmpty" > isEmpty< / a > () or if it
< a href = "#contains" > contains< / a > () a < a href = "ntqpoint.html" > TQPoint< / a > or < a href = "ntqrect.html" > TQRect< / a > . The bounding rectangle is given by
< a href = "#boundingRect" > boundingRect< / a > ().
< p > The function < a href = "#rects" > rects< / a > () gives a decomposition of the region into
rectangles.
< p > Example of using complex regions:
< pre >
void MyWidget::paintEvent( < a href = "qpaintevent.html" > TQPaintEvent< / a > * )
{
< a href = "ntqpainter.html" > TQPainter< / a > p; // our painter
TQRegion r1( TQRect(100,100,200,80), // r1 = elliptic region
TQRegion::< a href = "#RegionType-enum" > Ellipse< / a > );
TQRegion r2( TQRect(100,120,90,30) ); // r2 = rectangular region
TQRegion r3 = r1.< a href = "#intersect" > intersect< / a > ( r2 ); // r3 = intersection
p.< a href = "ntqpainter.html#begin" > begin< / a > ( this ); // start painting widget
p.< a href = "ntqpainter.html#setClipRegion" > setClipRegion< / a > ( r3 ); // set clip region
... // paint clipped graphics
p.< a href = "ntqpainter.html#end" > end< / a > (); // painting done
}
< / pre >
< p > TQRegion is an < a href = "shclass.html" > implicitly shared< / a > class.
< p > < b > Warning:< / b > Due to window system limitations, the whole coordinate
space for a region is limited to the points between -32767 and
32767 on Mac OS X and Windows 95/98/ME.
< p > < p > See also < a href = "ntqpainter.html#setClipRegion" > TQPainter::setClipRegion< / a > (), < a href = "ntqpainter.html#setClipRect" > TQPainter::setClipRect< / a > (), < a href = "graphics.html" > Graphics Classes< / a > , and < a href = "images.html" > Image Processing Classes< / a > .
< hr > < h2 > Member Type Documentation< / h2 >
< h3 class = fn > < a name = "RegionType-enum" > < / a > TQRegion::RegionType< / h3 >
< p > Specifies the shape of the region to be created.
< ul >
< li > < tt > TQRegion::Rectangle< / tt > - the region covers the entire rectangle.
< li > < tt > TQRegion::Ellipse< / tt > - the region is an ellipse inside the rectangle.
< / ul >
< hr > < h2 > Member Function Documentation< / h2 >
< h3 class = fn > < a name = "TQRegion" > < / a > TQRegion::TQRegion ()
< / h3 >
Constructs a null region.
< p > < p > See also < a href = "#isNull" > isNull< / a > ().
< h3 class = fn > < a name = "TQRegion-2" > < / a > TQRegion::TQRegion ( int x, int y, int w, int h, < a href = "ntqregion.html#RegionType-enum" > RegionType< / a > t = Rectangle )
< / h3 >
Constructs a rectangular or elliptic region.
< p > If < em > t< / em > is < a href = "#RegionType-enum" > Rectangle< / a > , the region is the filled rectangle (< em > x< / em > ,
< em > y< / em > , < em > w< / em > , < em > h< / em > ). If < em > t< / em > is < a href = "#RegionType-enum" > Ellipse< / a > , the region is the filled
ellipse with center at (< em > x< / em > + < em > w< / em > / 2, < em > y< / em > + < em > h< / em > / 2) and size
(< em > w< / em > ,< em > h< / em > ).
< h3 class = fn > < a name = "TQRegion-3" > < / a > TQRegion::TQRegion ( const < a href = "ntqrect.html" > TQRect< / a > & r, < a href = "ntqregion.html#RegionType-enum" > RegionType< / a > t = Rectangle )
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p > Create a region based on the rectange < em > r< / em > with region type < em > t< / em > .
< p > If the rectangle is invalid a null region will be created.
< p > < p > See also < a href = "#RegionType-enum" > TQRegion::RegionType< / a > .
< h3 class = fn > < a name = "TQRegion-4" > < / a > TQRegion::TQRegion ( const < a href = "ntqpointarray.html" > TQPointArray< / a > & a, bool winding = FALSE )
< / h3 >
Constructs a polygon region from the point array < em > a< / em > .
< p > If < em > winding< / em > is TRUE, the polygon region is filled using the
winding algorithm, otherwise the default even-odd fill algorithm
is used.
< p > This constructor may create complex regions that will slow down
painting when used.
< h3 class = fn > < a name = "TQRegion-5" > < / a > TQRegion::TQRegion ( const < a href = "ntqregion.html" > TQRegion< / a > & r )
< / h3 >
Constructs a new region which is equal to region < em > r< / em > .
< h3 class = fn > < a name = "TQRegion-6" > < / a > TQRegion::TQRegion ( const < a href = "ntqbitmap.html" > TQBitmap< / a > & bm )
< / h3 >
Constructs a region from the bitmap < em > bm< / em > .
< p > The resulting region consists of the pixels in bitmap < em > bm< / em > that
are < tt > color1< / tt > , as if each pixel was a 1 by 1 rectangle.
< p > This constructor may create complex regions that will slow down
painting when used. Note that drawing masked pixmaps can be done
much faster using < a href = "ntqpixmap.html#setMask" > TQPixmap::setMask< / a > ().
< h3 class = fn > < a name = "~TQRegion" > < / a > TQRegion::~TQRegion ()
< / h3 >
Destroys the region.
< h3 class = fn > < a href = "ntqrect.html" > TQRect< / a > < a name = "boundingRect" > < / a > TQRegion::boundingRect () const
< / h3 >
Returns the bounding rectangle of this region. An empty region
gives a rectangle that is < a href = "ntqrect.html#isNull" > TQRect::isNull< / a > ().
< h3 class = fn > bool < a name = "contains" > < / a > TQRegion::contains ( const < a href = "ntqpoint.html" > TQPoint< / a > & p ) const
< / h3 >
Returns TRUE if the region contains the point < em > p< / em > ; otherwise
returns FALSE.
< h3 class = fn > bool < a name = "contains-2" > < / a > TQRegion::contains ( const < a href = "ntqrect.html" > TQRect< / a > & r ) const
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p > Returns TRUE if the region overlaps the rectangle < em > r< / em > ; otherwise
returns FALSE.
< h3 class = fn > < a href = "ntqregion.html" > TQRegion< / a > < a name = "eor" > < / a > TQRegion::eor ( const < a href = "ntqregion.html" > TQRegion< / a > & r ) const
< / h3 >
Returns a region which is the exclusive or (XOR) of this region
and < em > r< / em > .
< p > < center > < img src = "rxor.png" alt = "Region XORed" > < / center >
< p > The figure shows the exclusive or of two elliptical regions.
< h3 class = fn > HRGN < a name = "handle" > < / a > TQRegion::handle () const
< / h3 >
< p > Returns the region's handle.
< h3 class = fn > < a href = "ntqregion.html" > TQRegion< / a > < a name = "intersect" > < / a > TQRegion::intersect ( const < a href = "ntqregion.html" > TQRegion< / a > & r ) const
< / h3 >
Returns a region which is the intersection of this region and < em > r< / em > .
< p > < center > < img src = "rintersect.png" alt = "Region Intersection" > < / center >
< p > The figure shows the intersection of two elliptical regions.
< h3 class = fn > bool < a name = "isEmpty" > < / a > TQRegion::isEmpty () const
< / h3 >
Returns TRUE if the region is empty; otherwise returns FALSE. An
empty region is a region that contains no points.
< p > Example:
< pre >
TQRegion r1( 10, 10, 20, 20 );
TQRegion r2( 40, 40, 20, 20 );
TQRegion r3;
r1.< a href = "#isNull" > isNull< / a > (); // FALSE
r1.< a href = "#isEmpty" > isEmpty< / a > (); // FALSE
r3.< a href = "#isNull" > isNull< / a > (); // TRUE
r3.< a href = "#isEmpty" > isEmpty< / a > (); // TRUE
r3 = r1.< a href = "#intersect" > intersect< / a > ( r2 ); // r3 = intersection of r1 and r2
r3.< a href = "#isNull" > isNull< / a > (); // FALSE
r3.< a href = "#isEmpty" > isEmpty< / a > (); // TRUE
r3 = r1.< a href = "#unite" > unite< / a > ( r2 ); // r3 = union of r1 and r2
r3.< a href = "#isNull" > isNull< / a > (); // FALSE
r3.< a href = "#isEmpty" > isEmpty< / a > (); // FALSE
< / pre >
< p > < p > See also < a href = "#isNull" > isNull< / a > ().
< h3 class = fn > bool < a name = "isNull" > < / a > TQRegion::isNull () const
< / h3 >
Returns TRUE if the region is a null region; otherwise returns
FALSE.
< p > A null region is a region that has not been initialized. A null
region is always empty.
< p > < p > See also < a href = "#isEmpty" > isEmpty< / a > ().
< h3 class = fn > bool < a name = "operator!-eq" > < / a > TQRegion::operator!= ( const < a href = "ntqregion.html" > TQRegion< / a > & r ) const
< / h3 >
< p > Returns TRUE if the region is different from < em > r< / em > ; otherwise
returns FALSE.
< h3 class = fn > const < a href = "ntqregion.html" > TQRegion< / a > < a name = "operator-and" > < / a > TQRegion::operator& ( const < a href = "ntqregion.html" > TQRegion< / a > & r ) const
< / h3 >
Applies the < a href = "#intersect" > intersect< / a > () function to this region and < em > r< / em > . < tt > r1& r2< / tt >
is equivalent to < tt > r1.intersect(r2)< / tt >
< p > < p > See also < a href = "#intersect" > intersect< / a > ().
< h3 class = fn > < a href = "ntqregion.html" > TQRegion< / a > & < a name = "operator-and-eq" > < / a > TQRegion::operator& = ( const < a href = "ntqregion.html" > TQRegion< / a > & r )
< / h3 >
Applies the < a href = "#intersect" > intersect< / a > () function to this region and < em > r< / em > and
assigns the result to this region. < tt > r1& =r2< / tt > is equivalent to < tt > r1=r1.intersect(r2)< / tt >
< p > < p > See also < a href = "#intersect" > intersect< / a > ().
< h3 class = fn > const < a href = "ntqregion.html" > TQRegion< / a > < a name = "operator+" > < / a > TQRegion::operator+ ( const < a href = "ntqregion.html" > TQRegion< / a > & r ) const
< / h3 >
Applies the < a href = "#unite" > unite< / a > () function to this region and < em > r< / em > . < tt > r1+r2< / tt > is
equivalent to < tt > r1.unite(r2)< / tt >
< p > < p > See also < a href = "#unite" > unite< / a > () and < a href = "#operator|" > operator|< / a > ().
< h3 class = fn > < a href = "ntqregion.html" > TQRegion< / a > & < a name = "operator+-eq" > < / a > TQRegion::operator+= ( const < a href = "ntqregion.html" > TQRegion< / a > & r )
< / h3 >
Applies the < a href = "#unite" > unite< / a > () function to this region and < em > r< / em > and assigns
the result to this region. < tt > r1+=r2< / tt > is equivalent to < tt > r1=r1.unite(r2)< / tt >
< p > < p > See also < a href = "#intersect" > intersect< / a > ().
< h3 class = fn > const < a href = "ntqregion.html" > TQRegion< / a > < a name = "operator-" > < / a > TQRegion::operator- ( const < a href = "ntqregion.html" > TQRegion< / a > & r ) const
< / h3 >
Applies the < a href = "#subtract" > subtract< / a > () function to this region and < em > r< / em > . < tt > r1-r2< / tt >
is equivalent to < tt > r1.subtract(r2)< / tt >
< p > < p > See also < a href = "#subtract" > subtract< / a > ().
< h3 class = fn > < a href = "ntqregion.html" > TQRegion< / a > & < a name = "operator--eq" > < / a > TQRegion::operator-= ( const < a href = "ntqregion.html" > TQRegion< / a > & r )
< / h3 >
Applies the < a href = "#subtract" > subtract< / a > () function to this region and < em > r< / em > and
assigns the result to this region. < tt > r1-=r2< / tt > is equivalent to < tt > r1=r1.subtract(r2)< / tt >
< p > < p > See also < a href = "#subtract" > subtract< / a > ().
< h3 class = fn > < a href = "ntqregion.html" > TQRegion< / a > & < a name = "operator-eq" > < / a > TQRegion::operator= ( const < a href = "ntqregion.html" > TQRegion< / a > & r )
< / h3 >
Assigns < em > r< / em > to this region and returns a reference to the region.
< h3 class = fn > bool < a name = "operator-eq-eq" > < / a > TQRegion::operator== ( const < a href = "ntqregion.html" > TQRegion< / a > & r ) const
< / h3 >
Returns TRUE if the region is equal to < em > r< / em > ; otherwise returns
FALSE.
< h3 class = fn > const < a href = "ntqregion.html" > TQRegion< / a > < a name = "operator^" > < / a > TQRegion::operator^ ( const < a href = "ntqregion.html" > TQRegion< / a > & r ) const
< / h3 >
Applies the < a href = "#eor" > eor< / a > () function to this region and < em > r< / em > . < tt > r1^r2< / tt > is
equivalent to < tt > r1.eor(r2)< / tt >
< p > < p > See also < a href = "#eor" > eor< / a > ().
< h3 class = fn > < a href = "ntqregion.html" > TQRegion< / a > & < a name = "operator^-eq" > < / a > TQRegion::operator^= ( const < a href = "ntqregion.html" > TQRegion< / a > & r )
< / h3 >
Applies the < a href = "#eor" > eor< / a > () function to this region and < em > r< / em > and
assigns the result to this region. < tt > r1^=r2< / tt > is equivalent to < tt > r1=r1.eor(r2)< / tt >
< p > < p > See also < a href = "#eor" > eor< / a > ().
< h3 class = fn > const < a href = "ntqregion.html" > TQRegion< / a > < a name = "operator|" > < / a > TQRegion::operator| ( const < a href = "ntqregion.html" > TQRegion< / a > & r ) const
< / h3 >
Applies the < a href = "#unite" > unite< / a > () function to this region and < em > r< / em > . < tt > r1|r2< / tt > is
equivalent to < tt > r1.unite(r2)< / tt >
< p > < p > See also < a href = "#unite" > unite< / a > () and < a href = "#operator+" > operator+< / a > ().
< h3 class = fn > < a href = "ntqregion.html" > TQRegion< / a > & < a name = "operator|-eq" > < / a > TQRegion::operator|= ( const < a href = "ntqregion.html" > TQRegion< / a > & r )
< / h3 >
Applies the < a href = "#unite" > unite< / a > () function to this region and < em > r< / em > and assigns
the result to this region. < tt > r1|=r2< / tt > is equivalent to < tt > r1=r1.unite(r2)< / tt >
< p > < p > See also < a href = "#unite" > unite< / a > ().
< h3 class = fn > < a href = "ntqmemarray.html" > TQMemArray< / a > < TQRect> < a name = "rects" > < / a > TQRegion::rects () const
< / h3 >
Returns an array of non-overlapping rectangles that make up the
region.
< p > The union of all the rectangles is equal to the original region.
< h3 class = fn > < a href = "ntqregion.html" > TQRegion< / a > < a name = "subtract" > < / a > TQRegion::subtract ( const < a href = "ntqregion.html" > TQRegion< / a > & r ) const
< / h3 >
Returns a region which is < em > r< / em > subtracted from this region.
< p > < center > < img src = "rsubtract.png" alt = "Region Subtraction" > < / center >
< p > The figure shows the result when the ellipse on the right is
subtracted from the ellipse on the left. (< tt > left-right< / tt > )
< h3 class = fn > void < a name = "translate" > < / a > TQRegion::translate ( int dx, int dy )
< / h3 >
Translates (moves) the region < em > dx< / em > along the X axis and < em > dy< / em >
along the Y axis.
< h3 class = fn > < a href = "ntqregion.html" > TQRegion< / a > < a name = "unite" > < / a > TQRegion::unite ( const < a href = "ntqregion.html" > TQRegion< / a > & r ) const
< / h3 >
Returns a region which is the union of this region and < em > r< / em > .
< p > < center > < img src = "runion.png" alt = "Region Union" > < / center >
< p > The figure shows the union of two elliptical regions.
< hr > < h2 > Related Functions< / h2 >
< h3 class = fn > < a href = "ntqdatastream.html" > TQDataStream< / a > & < a name = "operator-lt-lt" > < / a > operator< < ( < a href = "ntqdatastream.html" > TQDataStream< / a > & s, const < a href = "ntqregion.html" > TQRegion< / a > & r )
< / h3 >
< p > Writes the region < em > r< / em > to the stream < em > s< / em > and returns a reference
to the stream.
< p > < p > See also < a href = "datastreamformat.html" > Format of the TQDataStream operators< / a > .
< h3 class = fn > < a href = "ntqdatastream.html" > TQDataStream< / a > & < a name = "operator-gt-gt" > < / a > operator> > ( < a href = "ntqdatastream.html" > TQDataStream< / a > & s, < a href = "ntqregion.html" > TQRegion< / a > & r )
< / h3 >
< p > Reads a region from the stream < em > s< / em > into < em > r< / em > and returns a
reference to the stream.
< p > < p > See also < a href = "datastreamformat.html" > Format of the TQDataStream operators< / a > .
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