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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 > TQPoint Class Reference< / h1 >
< p > The TQPoint class defines a point in the plane.
< a href = "#details" > More...< / a >
< p > < tt > #include < < a href = "qpoint-h.html" > ntqpoint.h< / a > > < / tt >
< p > < a href = "qpoint-members.html" > List of all member functions.< / a >
< h2 > Public Members< / h2 >
< ul >
< li class = fn > < a href = "#TQPoint" > < b > TQPoint< / b > < / a > ()< / li >
< li class = fn > < a href = "#TQPoint-2" > < b > TQPoint< / b > < / a > ( int xpos, int ypos )< / li >
< li class = fn > bool < a href = "#isNull" > < b > isNull< / b > < / a > () const< / li >
< li class = fn > int < a href = "#x" > < b > x< / b > < / a > () const< / li >
< li class = fn > int < a href = "#y" > < b > y< / b > < / a > () const< / li >
< li class = fn > void < a href = "#setX" > < b > setX< / b > < / a > ( int x )< / li >
< li class = fn > void < a href = "#setY" > < b > setY< / b > < / a > ( int y )< / li >
< li class = fn > int < a href = "#manhattanLength" > < b > manhattanLength< / b > < / a > () const< / li >
< li class = fn > TQCOORD & < a href = "#rx" > < b > rx< / b > < / a > ()< / li >
< li class = fn > TQCOORD & < a href = "#ry" > < b > ry< / b > < / a > ()< / li >
< li class = fn > TQPoint & < a href = "#operator+-eq" > < b > operator+=< / b > < / a > ( const TQPoint & p )< / li >
< li class = fn > TQPoint & < a href = "#operator--eq" > < b > operator-=< / b > < / a > ( const TQPoint & p )< / li >
< li class = fn > TQPoint & < a href = "#operator*-eq" > < b > operator*=< / b > < / a > ( int c )< / li >
< li class = fn > TQPoint & < a href = "#operator*-eq-2" > < b > operator*=< / b > < / a > ( double c )< / li >
< li class = fn > TQPoint & < a href = "#operator/-eq" > < b > operator/=< / b > < / a > ( int c )< / li >
< li class = fn > TQPoint & < a href = "#operator/-eq-2" > < b > operator/=< / b > < / a > ( double c )< / li >
< / ul >
< h2 > Related Functions< / h2 >
< ul >
< li class = fn > bool < a href = "#operator-eq-eq" > < b > operator==< / b > < / a > ( const TQPoint & p1, const TQPoint & p2 )< / li >
< li class = fn > bool < a href = "#operator!-eq" > < b > operator!=< / b > < / a > ( const TQPoint & p1, const TQPoint & p2 )< / li >
< li class = fn > const TQPoint < a href = "#operator+" > < b > operator+< / b > < / a > ( const TQPoint & p1, const TQPoint & p2 )< / li >
< li class = fn > const TQPoint < a href = "#operator-" > < b > operator-< / b > < / a > ( const TQPoint & p1, const TQPoint & p2 )< / li >
< li class = fn > const TQPoint < a href = "#operator*" > < b > operator*< / b > < / a > ( const TQPoint & p, int c )< / li >
< li class = fn > const TQPoint < a href = "#operator*-2" > < b > operator*< / b > < / a > ( int c, const TQPoint & p )< / li >
< li class = fn > const TQPoint < a href = "#operator*-3" > < b > operator*< / b > < / a > ( const TQPoint & p, double c )< / li >
< li class = fn > const TQPoint < a href = "#operator*-4" > < b > operator*< / b > < / a > ( double c, const TQPoint & p )< / li >
< li class = fn > const TQPoint < a href = "#operator--2" > < b > operator-< / b > < / a > ( const TQPoint & p )< / li >
< li class = fn > const TQPoint < a href = "#operator/" > < b > operator/< / b > < / a > ( const TQPoint & p, int c )< / li >
< li class = fn > const TQPoint < a href = "#operator/-2" > < b > operator/< / b > < / a > ( const TQPoint & p, double c )< / li >
< li class = fn > TQDataStream & < a href = "#operator-lt-lt" > < b > operator< < < / b > < / a > ( TQDataStream & s, const TQPoint & p )< / li >
< li class = fn > TQDataStream & < a href = "#operator-gt-gt" > < b > operator> > < / b > < / a > ( TQDataStream & s, TQPoint & p )< / li >
< / ul >
< hr > < a name = "details" > < / a > < h2 > Detailed Description< / h2 >
The TQPoint class defines a point in the plane.
< p >
< p > A point is specified by an x coordinate and a y coordinate.
< p > The coordinate type is < tt > TQCOORD< / tt > (a 32-bit integer). The minimum
value of < tt > TQCOORD< / tt > is < tt > TQCOORD_MIN< / tt > (-2147483648) and the maximum
value is < tt > TQCOORD_MAX< / tt > (2147483647).
< p > The coordinates are accessed by the functions < a href = "#x" > x< / a > () and < a href = "#y" > y< / a > (); they
can be set by < a href = "#setX" > setX< / a > () and < a href = "#setY" > setY< / a > () or by the reference functions < a href = "#rx" > rx< / a > ()
and < a href = "#ry" > ry< / a > ().
< p > Given a point < em > p< / em > , the following statements are all equivalent:
< pre >
p.setX( p.x() + 1 );
p += < a href = "#TQPoint" > TQPoint< / a > ( 1, 0 );
p.rx()++;
< / pre >
< p > A TQPoint can also be used as a vector. Addition and subtraction
of TQPoints are defined as for vectors (each component is added
separately). You can divide or multiply a TQPoint by an < tt > int< / tt > or a
< tt > double< / tt > . The function < a href = "#manhattanLength" > manhattanLength< / a > () gives an inexpensive
approximation of the length of the TQPoint interpreted as a vector.
< p > Example:
< pre >
//TQPoint oldPos is defined somewhere else
MyWidget::mouseMoveEvent( < a href = "qmouseevent.html" > TQMouseEvent< / a > *e )
{
TQPoint vector = e-> < a href = "qmouseevent.html#pos" > pos< / a > () - oldPos;
if ( vector.< a href = "#manhattanLength" > manhattanLength< / a > () > 3 )
... //mouse has moved more than 3 pixels since oldPos
}
< / pre >
< p > TQPoints can be compared for equality or inequality, and they can
be written to and read from a TQStream.
< p > < p > See also < a href = "ntqpointarray.html" > TQPointArray< / a > , < a href = "tqsize.html" > TQSize< / a > , < a href = "ntqrect.html" > TQRect< / a > , < a href = "graphics.html" > Graphics Classes< / a > , and < a href = "images.html" > Image Processing Classes< / a > .
< hr > < h2 > Member Function Documentation< / h2 >
< h3 class = fn > < a name = "TQPoint" > < / a > TQPoint::TQPoint ()
< / h3 >
< p > Constructs a point with coordinates (0, 0) (< a href = "#isNull" > isNull< / a > () returns TRUE).
< h3 class = fn > < a name = "TQPoint-2" > < / a > TQPoint::TQPoint ( int xpos, int ypos )
< / h3 >
< p > Constructs a point with x value < em > xpos< / em > and y value < em > ypos< / em > .
< h3 class = fn > bool < a name = "isNull" > < / a > TQPoint::isNull () const
< / h3 >
< p > Returns TRUE if both the x value and the y value are 0; otherwise
returns FALSE.
< h3 class = fn > int < a name = "manhattanLength" > < / a > TQPoint::manhattanLength () const
< / h3 >
Returns the sum of the absolute values of < a href = "#x" > x< / a > () and < a href = "#y" > y< / a > (),
traditionally known as the "Manhattan length" of the vector from
the origin to the point. The tradition arises because such
distances apply to travelers who can only travel on a rectangular
grid, like the streets of Manhattan.
< p > This is a useful, and quick to calculate, approximation to the
true length: sqrt(pow(x(),2)+pow(y(),2)).
< h3 class = fn > < a href = "ntqpoint.html" > TQPoint< / a > & < a name = "operator*-eq" > < / a > TQPoint::operator*= ( int c )
< / h3 >
< p > Multiplies this point's x and y by < em > c< / em > , and returns a reference
to this point.
< p > Example:
< pre >
TQPoint p( -1, 4 );
p *= 2; // p becomes (-2,8)
< / pre >
< h3 class = fn > < a href = "ntqpoint.html" > TQPoint< / a > & < a name = "operator*-eq-2" > < / a > TQPoint::operator*= ( double c )
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p > Multiplies this point's x and y by < em > c< / em > , and returns a reference
to this point.
< p > Example:
< pre >
TQPoint p( -1, 4 );
p *= 2.5; // p becomes (-3,10)
< / pre >
< p > Note that the result is truncated because points are held as
integers.
< h3 class = fn > < a href = "ntqpoint.html" > TQPoint< / a > & < a name = "operator+-eq" > < / a > TQPoint::operator+= ( const < a href = "ntqpoint.html" > TQPoint< / a > & p )
< / h3 >
< p > Adds point < em > p< / em > to this point and returns a reference to this
point.
< p > Example:
< pre >
TQPoint p( 3, 7 );
TQPoint q( -1, 4 );
p += q; // p becomes (2,11)
< / pre >
< h3 class = fn > < a href = "ntqpoint.html" > TQPoint< / a > & < a name = "operator--eq" > < / a > TQPoint::operator-= ( const < a href = "ntqpoint.html" > TQPoint< / a > & p )
< / h3 >
< p > Subtracts point < em > p< / em > from this point and returns a reference to
this point.
< p > Example:
< pre >
TQPoint p( 3, 7 );
TQPoint q( -1, 4 );
p -= q; // p becomes (4,3)
< / pre >
< h3 class = fn > < a href = "ntqpoint.html" > TQPoint< / a > & < a name = "operator/-eq" > < / a > TQPoint::operator/= ( int c )
< / h3 >
< p > Divides both x and y by < em > c< / em > , and returns a reference to this
point.
< p > Example:
< pre >
TQPoint p( -2, 8 );
p /= 2; // p becomes (-1,4)
< / pre >
< h3 class = fn > < a href = "ntqpoint.html" > TQPoint< / a > & < a name = "operator/-eq-2" > < / a > TQPoint::operator/= ( double c )
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p > Divides both x and y by < em > c< / em > , and returns a reference to this
point.
< p > Example:
< pre >
TQPoint p( -3, 10 );
p /= 2.5; // p becomes (-1,4)
< / pre >
< p > Note that the result is truncated because points are held as
integers.
< h3 class = fn > TQCOORD & < a name = "rx" > < / a > TQPoint::rx ()
< / h3 >
< p > Returns a reference to the x coordinate of the point.
< p > Using a reference makes it possible to directly manipulate x.
< p > Example:
< pre >
TQPoint p( 1, 2 );
p.< a href = "#rx" > rx< / a > ()--; // p becomes (0, 2)
< / pre >
< p > < p > See also < a href = "#ry" > ry< / a > ().
< h3 class = fn > TQCOORD & < a name = "ry" > < / a > TQPoint::ry ()
< / h3 >
< p > Returns a reference to the y coordinate of the point.
< p > Using a reference makes it possible to directly manipulate y.
< p > Example:
< pre >
TQPoint p( 1, 2 );
p.< a href = "#ry" > ry< / a > ()++; // p becomes (1, 3)
< / pre >
< p > < p > See also < a href = "#rx" > rx< / a > ().
< h3 class = fn > void < a name = "setX" > < / a > TQPoint::setX ( int x )
< / h3 >
< p > Sets the x coordinate of the point to < em > x< / em > .
< p > < p > See also < a href = "#x" > x< / a > () and < a href = "#setY" > setY< / a > ().
< p > Example: < a href = "tutorial1-14.html#x2422" > t14/cannon.cpp< / a > .
< h3 class = fn > void < a name = "setY" > < / a > TQPoint::setY ( int y )
< / h3 >
< p > Sets the y coordinate of the point to < em > y< / em > .
< p > < p > See also < a href = "#y" > y< / a > () and < a href = "#setX" > setX< / a > ().
< p > Example: < a href = "tutorial1-14.html#x2423" > t14/cannon.cpp< / a > .
< h3 class = fn > int < a name = "x" > < / a > TQPoint::x () const
< / h3 >
< p > Returns the x coordinate of the point.
< p > < p > See also < a href = "#setX" > setX< / a > () and < a href = "#y" > y< / a > ().
< p > Examples: < a href = "canvas-example.html#x2944" > canvas/canvas.cpp< / a > , < a href = "tutorial2-06.html#x2581" > chart/canvasview.cpp< / a > , < a href = "dirview-example.html#x1696" > dirview/dirview.cpp< / a > , < a href = "fileiconview-example.html#x864" > fileiconview/qfileiconview.cpp< / a > , < a href = "helpsystem-example.html#x2679" > helpsystem/tooltip.cpp< / a > , < a href = "life-example.html#x1893" > life/life.cpp< / a > , and < a href = "tutorial1-14.html#x2424" > t14/cannon.cpp< / a > .
< h3 class = fn > int < a name = "y" > < / a > TQPoint::y () const
< / h3 >
< p > Returns the y coordinate of the point.
< p > < p > See also < a href = "#setY" > setY< / a > () and < a href = "#x" > x< / a > ().
< p > Examples: < a href = "canvas-example.html#x2945" > canvas/canvas.cpp< / a > , < a href = "tutorial2-06.html#x2582" > chart/canvasview.cpp< / a > , < a href = "fileiconview-example.html#x865" > fileiconview/qfileiconview.cpp< / a > , < a href = "helpsystem-example.html#x2680" > helpsystem/tooltip.cpp< / a > , < a href = "life-example.html#x1894" > life/life.cpp< / a > , < a href = "tutorial1-14.html#x2425" > t14/cannon.cpp< / a > , and < a href = "themes-example.html#x230" > themes/wood.cpp< / a > .
< hr > < h2 > Related Functions< / h2 >
< h3 class = fn > bool < a name = "operator!-eq" > < / a > operator!= ( const < a href = "ntqpoint.html" > TQPoint< / a > & p1, const < a href = "ntqpoint.html" > TQPoint< / a > & p2 )
< / h3 >
< p >
< p > Returns TRUE if < em > p1< / em > and < em > p2< / em > are not equal; otherwise returns FALSE.
< h3 class = fn > const < a href = "ntqpoint.html" > TQPoint< / a > < a name = "operator*" > < / a > operator* ( const < a href = "ntqpoint.html" > TQPoint< / a > & p, int c )
< / h3 >
< p >
< p > Returns the TQPoint formed by multiplying both components of < em > p< / em >
by < em > c< / em > .
< h3 class = fn > const < a href = "ntqpoint.html" > TQPoint< / a > < a name = "operator*-2" > < / a > operator* ( int c, const < a href = "ntqpoint.html" > TQPoint< / a > & p )
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p >
< p > Returns the TQPoint formed by multiplying both components of < em > p< / em >
by < em > c< / em > .
< h3 class = fn > const < a href = "ntqpoint.html" > TQPoint< / a > < a name = "operator*-3" > < / a > operator* ( const < a href = "ntqpoint.html" > TQPoint< / a > & p, double c )
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p >
< p > Returns the TQPoint formed by multiplying both components of < em > p< / em >
by < em > c< / em > .
< p > Note that the result is truncated because points are held as
integers.
< h3 class = fn > const < a href = "ntqpoint.html" > TQPoint< / a > < a name = "operator*-4" > < / a > operator* ( double c, const < a href = "ntqpoint.html" > TQPoint< / a > & p )
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p >
< p > Returns the TQPoint formed by multiplying both components of < em > p< / em >
by < em > c< / em > .
< p > Note that the result is truncated because points are held as
integers.
< h3 class = fn > const < a href = "ntqpoint.html" > TQPoint< / a > < a name = "operator+" > < / a > operator+ ( const < a href = "ntqpoint.html" > TQPoint< / a > & p1, const < a href = "ntqpoint.html" > TQPoint< / a > & p2 )
< / h3 >
< p >
< p > Returns the sum of < em > p1< / em > and < em > p2< / em > ; each component is added separately.
< h3 class = fn > const < a href = "ntqpoint.html" > TQPoint< / a > < a name = "operator-" > < / a > operator- ( const < a href = "ntqpoint.html" > TQPoint< / a > & p1, const < a href = "ntqpoint.html" > TQPoint< / a > & p2 )
< / h3 >
< p >
< p > Returns < em > p2< / em > subtracted from < em > p1< / em > ; each component is subtracted
separately.
< h3 class = fn > const < a href = "ntqpoint.html" > TQPoint< / a > < a name = "operator--2" > < / a > operator- ( const < a href = "ntqpoint.html" > TQPoint< / a > & p )
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p >
< p > Returns the TQPoint formed by changing the sign of both components
of < em > p< / em > , equivalent to < tt > TQPoint(0,0) - p< / tt > .
< h3 class = fn > const < a href = "ntqpoint.html" > TQPoint< / a > < a name = "operator/" > < / a > operator/ ( const < a href = "ntqpoint.html" > TQPoint< / a > & p, int c )
< / h3 >
< p >
< p > Returns the TQPoint formed by dividing both components of < em > p< / em > by
< em > c< / em > .
< h3 class = fn > const < a href = "ntqpoint.html" > TQPoint< / a > < a name = "operator/-2" > < / a > operator/ ( const < a href = "ntqpoint.html" > TQPoint< / a > & p, double c )
< / h3 >
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
< p >
< p > Returns the TQPoint formed by dividing both components of < em > p< / em >
by < em > c< / em > .
< p > Note that the result is truncated because points are held as
integers.
< 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 = "ntqpoint.html" > TQPoint< / a > & p )
< / h3 >
< p > Writes point < em > p< / 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 > bool < a name = "operator-eq-eq" > < / a > operator== ( const < a href = "ntqpoint.html" > TQPoint< / a > & p1, const < a href = "ntqpoint.html" > TQPoint< / a > & p2 )
< / h3 >
< p >
< p > Returns TRUE if < em > p1< / em > and < em > p2< / em > are equal; otherwise returns FALSE.
< 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 = "ntqpoint.html" > TQPoint< / a > & p )
< / h3 >
< p > Reads a TQPoint from the stream < em > s< / em > into point < em > p< / 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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< td align = right > < div align = right > TQt 3.3.8< / div >
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