The Q3CanvasSprite class provides an animated canvas item on a Q3Canvas . 更多...
| 头： | #include <Q3CanvasSprite> |
| 继承： | Q3CanvasItem |
| enum | FrameAnimationType { Cycle, Oscillate } |
| Q3CanvasSprite (Q3CanvasPixmapArray * a , Q3Canvas * canvas ) | |
| virtual | ~Q3CanvasSprite () |
| int | bottomEdge () const |
| int | bottomEdge (int ny ) const |
| int | frame () const |
| int | frameCount () const |
| int | height () const |
| Q3CanvasPixmap * | image () const |
| Q3CanvasPixmap * | image (int f ) const |
| virtual Q3CanvasPixmap * | imageAdvanced () const |
| int | leftEdge () const |
| int | leftEdge (int nx ) const |
| void | move (double x , double y ) |
| virtual void | move (double nx , double ny , int nf ) |
| int | rightEdge () const |
| int | rightEdge (int nx ) const |
| void | setFrame (int f ) |
| virtual void | setFrameAnimation (FrameAnimationType type = Cycle, int step = 1, int state = 0) |
| void | setSequence (Q3CanvasPixmapArray * a ) |
| int | topEdge () const |
| int | topEdge (int ny ) const |
| int | width () const |
| virtual void | advance (int phase ) |
| virtual QRect | boundingRect () const |
| virtual bool | collidesWith (const Q3CanvasItem * i ) const |
| virtual void | draw (QPainter & painter ) |
| virtual int | rtti () const |
The Q3CanvasSprite class provides an animated canvas item on a Q3Canvas .
A canvas sprite is an object which can contain any number of images (referred to as frames), only one of which is current, i.e. displayed, at any one time. The images can be passed in the constructor or set or changed later with setSequence (). If you subclass Q3CanvasSprite you can change the frame that is displayed periodically, e.g. whenever Q3CanvasItem::advance (1) is called to create the effect of animation.
The current frame can be set with setFrame () 或采用 move (). The number of frames available is given by frameCount (). The bounding rectangle of the current frame is returned by boundingRect ().
The current frame's image can be retrieved with image ()；使用 imageAdvanced () to retrieve the image for the frame that will be shown after advance(1) is called. Use the image () overload passing it an integer index to retrieve a particular image from the list of frames.
使用 width () 和 height () to retrieve the dimensions of the current frame.
使用 leftEdge () 和 rightEdge () to retrieve the current frame's left-hand and right-hand x-coordinates respectively. Use bottomEdge () 和 topEdge () to retrieve the current frame's bottom and top y-coordinates respectively. These functions have an overload which will accept an integer frame number to retrieve the coordinates of a particular frame.
Q3CanvasSprite draws very quickly, at the expense of memory.
The current frame's image can be drawn on a painter with draw ().
Like any other canvas item, canvas sprites can be moved with move () which sets the x and y coordinates and the frame number, as well as with Q3CanvasItem::move () 和 Q3CanvasItem::moveBy (), or by setting coordinates with Q3CanvasItem::setX (), Q3CanvasItem::setY () 和 Q3CanvasItem::setZ ().
另请参阅 QtCanvas and Porting to Graphics View .
This enum is used to identify the different types of frame animation offered by Q3CanvasSprite .
| 常量 | 值 | 描述 |
|---|---|---|
Q3CanvasSprite::Cycle
|
0
|
at each advance the frame number will be incremented by 1 (modulo the frame count). |
Q3CanvasSprite::Oscillate
|
1
|
at each advance the frame number will be incremented by 1 up to the frame count then decremented to by 1 to 0, repeating this sequence forever. |
构造 Q3CanvasSprite which uses images from the Q3CanvasPixmapArray a .
The sprite in initially positioned at (0, 0) on canvas , using frame 0.
[虚拟]
Q3CanvasSprite::
~Q3CanvasSprite
()
Destroys the sprite and removes it from the canvas. Does not delete the images.
[虚拟]
void
Q3CanvasSprite::
advance
(
int
phase
)
重实现自 Q3CanvasItem::advance ().
Extends the default Q3CanvasItem implementation to provide the functionality of setFrameAnimation ().
The phase is 0 or 1: see Q3CanvasItem::advance () 了解细节。
另请参阅 Q3CanvasItem::advance () 和 setVelocity ().
Returns the y-coordinate of the current bottom edge of the sprite. (This may change as the sprite animates since different frames may have different bottom edges.)
另请参阅 leftEdge (), rightEdge ()，和 topEdge ().
这是重载函数。
Returns what the y-coordinate of the top edge of the sprite would be if the sprite (actually its hotspot) were moved to y-position ny .
另请参阅 leftEdge (), rightEdge ()，和 topEdge ().
[虚拟]
QRect
Q3CanvasSprite::
boundingRect
() const
重实现自 Q3CanvasItem::boundingRect ().
Returns the bounding rectangle for the image in the sprite's current frame. This assumes that the images are tightly cropped (i.e. do not have transparent pixels all along a side).
[虚拟]
bool
Q3CanvasSprite::
collidesWith
(const
Q3CanvasItem
*
i
) const
重实现自 Q3CanvasItem::collidesWith ().
[虚拟]
void
Q3CanvasSprite::
draw
(
QPainter
&
painter
)
重实现自 Q3CanvasItem::draw ().
Draws the current frame's image at the sprite's current position on painter painter .
Returns the index of the current animation frame in the Q3CanvasSprite 's Q3CanvasPixmapArray .
Returns the number of frames in the Q3CanvasSprite 's Q3CanvasPixmapArray .
The height of the sprite for the current frame's image.
另请参阅 frame ().
Returns the current frame's image.
这是重载函数。
Returns the image for frame f . Does not do any bounds checking on f .
[虚拟]
Q3CanvasPixmap
* Q3CanvasSprite::
imageAdvanced
() const
Returns the image the sprite will have after advance(1) is called. By default this is the same as image ().
Returns the x-coordinate of the current left edge of the sprite. (This may change as the sprite animates since different frames may have different left edges.)
另请参阅 rightEdge (), bottomEdge ()，和 topEdge ().
这是重载函数。
Returns what the x-coordinate of the left edge of the sprite would be if the sprite (actually its hotspot) were moved to x-position nx .
另请参阅 rightEdge (), bottomEdge ()，和 topEdge ().
Moves the sprite to ( x , y ).
[虚拟]
void
Q3CanvasSprite::
move
(
double
nx
,
double
ny
,
int
nf
)
Moves the sprite to ( nx , ny ) and sets the current frame to nf . nf will be ignored if it is larger than frameCount () or smaller than 0.
Returns the x-coordinate of the current right edge of the sprite. (This may change as the sprite animates since different frames may have different right edges.)
另请参阅 leftEdge (), bottomEdge ()，和 topEdge ().
这是重载函数。
Returns what the x-coordinate of the right edge of the sprite would be if the sprite (actually its hotspot) were moved to x-position nx .
另请参阅 leftEdge (), bottomEdge ()，和 topEdge ().
[虚拟]
int
Q3CanvasSprite::
rtti
() const
重实现自 Q3CanvasItem::rtti ().
Returns 1 ( Q3CanvasItem::Rtti_Sprite ).
另请参阅 Q3CanvasItem::rtti ().
Sets the animation frame used for displaying the sprite to f , an index into the Q3CanvasSprite 's Q3CanvasPixmapArray . The call will be ignored if f > frameCount () or smaller than 0.
[虚拟]
void
Q3CanvasSprite::
setFrameAnimation
(
FrameAnimationType
type
= Cycle,
int
step
= 1,
int
state
= 0)
Sets the animation characteristics for the sprite.
For
type
==
Cycle
, the frames will increase by
step
at each advance, modulo the
frameCount
().
For
type
==
Oscillate
, the frames will increase by
step
at each advance, up to the
frameCount
(), then decrease by
step
back to 0, repeating forever.
The state parameter is for internal use.
Set the array of images used for displaying the sprite to the Q3CanvasPixmapArray a .
If the current frame () is larger than the number of images in a , the current frame will be reset to 0.
Returns the y-coordinate of the top edge of the sprite. (This may change as the sprite animates since different frames may have different top edges.)
另请参阅 leftEdge (), rightEdge ()，和 bottomEdge ().
这是重载函数。
Returns what the y-coordinate of the top edge of the sprite would be if the sprite (actually its hotspot) were moved to y-position ny .
另请参阅 leftEdge (), rightEdge ()，和 bottomEdge ().
The width of the sprite for the current frame's image.
另请参阅 frame ().