Detailed Description
The QCanvasPixmapArray class provides an array of QCanvasPixmaps.
This class is used by QCanvasSprite to hold an array of pixmaps.
It is used to implement animated sprites, i.e. images that change
over time, with each pixmap in the array holding one frame.
Depending on the constructor you use you can load multiple pixmaps
into the array either from a directory (specifying a wildcard
pattern for the files), or from a list of QPixmaps. You can also
read in a set of pixmaps after construction using readPixmaps().
Individual pixmaps can be set with setImage() and retrieved with
image(). The number of pixmaps in the array is returned by
count().
QCanvasSprite uses an image's mask for collision detection. You
can change this by reading in a separate set of image masks using
readCollisionMasks().
See also Graphics Classes and Image Processing Classes.
Member Function Documentation
QCanvasPixmapArray::QCanvasPixmapArray ()
Constructs an invalid array (i.e. isValid() will return FALSE).
You must call readPixmaps() before being able to use this
QCanvasPixmapArray.
QCanvasPixmapArray::QCanvasPixmapArray ( const QString & datafilenamepattern, int fc = 0 )
Constructs a QCanvasPixmapArray from files.
The fc parameter sets the number of frames to be loaded for
this image.
If fc is not 0, datafilenamepattern should contain "%1",
e.g. "foo%1.png". The actual filenames are formed by replacing the
%1 with four-digit integers from 0 to (fc - 1), e.g. foo0000.png,
foo0001.png, foo0002.png, etc.
If fc is 0, datafilenamepattern is asssumed to be a
filename, and the image contained in this file will be loaded as
the first (and only) frame.
If datafilenamepattern does not exist, is not readable, isn't
an image, or some other error occurs, the array ends up empty and
isValid() returns FALSE.
QCanvasPixmapArray::QCanvasPixmapArray ( QPtrList<QPixmap> list, QPtrList<QPoint> hotspots )
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Use QCanvasPixmapArray::QCanvasPixmapArray( QValueList, QPointArray )
instead.
Constructs a QCanvasPixmapArray from the list of QPixmaps list. The hotspots list has to be of the same size as list.
QCanvasPixmapArray::QCanvasPixmapArray ( QValueList<QPixmap> list, QPointArray hotspots = QPointArray ( ) )
Constructs a QCanvasPixmapArray from the list of QPixmaps in the
list. Each pixmap will get a hotspot according to the hotspots array. If no hotspots are specified, each one is set to
be at position (0, 0).
If an error occurs, isValid() will return FALSE.
QCanvasPixmapArray::~QCanvasPixmapArray ()
Destroys the pixmap array and all the pixmaps it contains.
uint QCanvasPixmapArray::count () const
Returns the number of pixmaps in the array.
QCanvasPixmap * QCanvasPixmapArray::image ( int i ) const
Returns pixmap i in the array, if i is non-negative and less
than than count(), and returns an unspecified value otherwise.
bool QCanvasPixmapArray::isValid () const
Returns TRUE if the pixmap array is valid; otherwise returns
FALSE.
bool QCanvasPixmapArray::operator! ()
This function is obsolete. It is provided to keep old source working. We strongly advise against using it in new code.
Use isValid() instead.
This returns FALSE if the array is valid, and TRUE if it is not.
bool QCanvasPixmapArray::readCollisionMasks ( const QString & filename )
Reads new collision masks for the array.
By default, QCanvasSprite uses the image mask of a sprite to
detect collisions. Use this function to set your own collision
image masks.
If count() is 1 filename must specify a real filename to read
the mask from. If count() is greater than 1, the filename must
contain a "%1" that will get replaced by the number of the mask to
be loaded, just like QCanvasPixmapArray::readPixmaps().
All collision masks must be 1-bit images or this function call
will fail.
If the file isn't readable, contains the wrong number of images,
or there is some other error, this function will return FALSE, and
the array will be flagged as invalid; otherwise this function
returns TRUE.
See also isValid().
bool QCanvasPixmapArray::readPixmaps ( const QString & filenamepattern, int fc = 0 )
Reads one or more pixmaps into the pixmap array.
If fc is not 0, filenamepattern should contain "%1", e.g.
"foo%1.png". The actual filenames are formed by replacing the %1
with four-digit integers from 0 to (fc - 1), e.g. foo0000.png,
foo0001.png, foo0002.png, etc.
If fc is 0, filenamepattern is asssumed to be a filename,
and the image contained in this file will be loaded as the first
(and only) frame.
If filenamepattern does not exist, is not readable, isn't an
image, or some other error occurs, this function will return
FALSE, and isValid() will return FALSE; otherwise this function
will return TRUE.
See also isValid().
void QCanvasPixmapArray::setImage ( int i, QCanvasPixmap * p )
Replaces the pixmap at index i with pixmap p.
The array takes ownership of p and will delete p when the
array itself is deleted.
If i is beyond the end of the array the array is extended to at
least i+1 elements, with elements count() to i-1 being initialized
to 0.
This file is part of the Qt toolkit.
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Trolltech. All Rights Reserved.
