QEasingCurve Class Reference

typedef  EasingFunction 
enum  Type { Linear, InQuad, OutQuad, InOutQuad, ..., Custom } 
QEasingCurve ( Type type = Linear )  
QEasingCurve ( const QEasingCurve & other )  
~QEasingCurve ()  
qreal  amplitude () const 
EasingFunction  customType () const 
qreal  overshoot () const 
qreal  period () const 
void  setAmplitude ( qreal amplitude ) 
void  setCustomType ( EasingFunction func ) 
void  setOvershoot ( qreal overshoot ) 
void  setPeriod ( qreal period ) 
void  setType ( Type type ) 
Type  type () const 
qreal  valueForProgress ( qreal progress ) const 
bool  operator!= ( const QEasingCurve & other ) const 
QEasingCurve &  operator= ( const QEasingCurve & other ) 
bool  operator== ( const QEasingCurve & other ) const 
The QEasingCurve class provides easing curves for controlling animation.
Easing curves describe a function that controls how the speed of the interpolation between 0 and 1 should be. Easing curves allow transitions from one value to another to appear more natural than a simple constant speed would allow. The QEasingCurve class is usually used in conjunction with the QVariantAnimation and QPropertyAnimation classes but can be used on its own. It is usually used to accelerate the interpolation from zero velocity (ease in) or decelerate to zero velocity (ease out). Ease in and ease out can also be combined in the same easing curve.
To calculate the speed of the interpolation, the easing curve provides the function valueForProgress(), where the progress argument specifies the progress of the interpolation: 0 is the start value of the interpolation, 1 is the end value of the interpolation. The returned value is the effective progress of the interpolation. If the returned value is the same as the input value for all input values the easing curve is a linear curve. This is the default behaviour.
For example,
QEasingCurve easing(QEasingCurve::InOutQuad); for(qreal t = 0.0; t < 1.0; t+=0.1) qWarning() << "Effective progress" << t << " is << easing.valueForProgress(t);
will print the effective progress of the interpolation between 0 and 1.
When using a QPropertyAnimation, the associated easing curve will be used to control the progress of the interpolation between startValue and endValue:
QPropertyAnimation animation; animation.setStartValue(0); animation.setEndValue(1000); animation.setDuration(1000); animation.setEasingCurve(QEasingCurve::InOutQuad);
This is a typedef for a pointer to a function with the following signature:
qreal myEasingFunction(qreal progress);
The type of easing curve.
Constant  Value  Description 

QEasingCurve::Linear  0  Easing curve for a linear (t) function: velocity is constant. 
QEasingCurve::InQuad  1  Easing curve for a quadratic (t^2) function: accelerating from zero velocity. 
QEasingCurve::OutQuad  2  Easing curve for a quadratic (t^2) function: decelerating to zero velocity. 
QEasingCurve::InOutQuad  3  Easing curve for a quadratic (t^2) function: acceleration until halfway, then deceleration. 
QEasingCurve::OutInQuad  4  Easing curve for a quadratic (t^2) function: deceleration until halfway, then acceleration. 
QEasingCurve::InCubic  5  Easing curve for a cubic (t^3) function: accelerating from zero velocity. 
QEasingCurve::OutCubic  6  Easing curve for a cubic (t^3) function: decelerating from zero velocity. 
QEasingCurve::InOutCubic  7  Easing curve for a cubic (t^3) function: acceleration until halfway, then deceleration. 
QEasingCurve::OutInCubic  8  Easing curve for a cubic (t^3) function: deceleration until halfway, then acceleration. 
QEasingCurve::InQuart  9  Easing curve for a quartic (t^4) function: accelerating from zero velocity. 
QEasingCurve::OutQuart  10  Easing curve for a cubic (t^4) function: decelerating from zero velocity. 
QEasingCurve::InOutQuart  11  Easing curve for a cubic (t^4) function: acceleration until halfway, then deceleration. 
QEasingCurve::OutInQuart  12  Easing curve for a cubic (t^4) function: deceleration until halfway, then acceleration. 
QEasingCurve::InQuint  13  Easing curve for a quintic (t^5) easing in: accelerating from zero velocity. 
QEasingCurve::OutQuint  14  Easing curve for a cubic (t^5) function: decelerating from zero velocity. 
QEasingCurve::InOutQuint  15  Easing curve for a cubic (t^5) function: acceleration until halfway, then deceleration. 
QEasingCurve::OutInQuint  16  Easing curve for a cubic (t^5) function: deceleration until halfway, then acceleration. 
QEasingCurve::InSine  17  Easing curve for a sinusoidal (sin(t)) function: accelerating from zero velocity. 
QEasingCurve::OutSine  18  Easing curve for a sinusoidal (sin(t)) function: decelerating from zero velocity. 
QEasingCurve::InOutSine  19  Easing curve for a sinusoidal (sin(t)) function: acceleration until halfway, then deceleration. 
QEasingCurve::OutInSine  20  Easing curve for a sinusoidal (sin(t)) function: deceleration until halfway, then acceleration. 
QEasingCurve::InExpo  21  Easing curve for an exponential (2^t) function: accelerating from zero velocity. 
QEasingCurve::OutExpo  22  Easing curve for an exponential (2^t) function: decelerating from zero velocity. 
QEasingCurve::InOutExpo  23  Easing curve for an exponential (2^t) function: acceleration until halfway, then deceleration. 
QEasingCurve::OutInExpo  24  Easing curve for an exponential (2^t) function: deceleration until halfway, then acceleration. 
QEasingCurve::InCirc  25  Easing curve for a circular (sqrt(1t^2)) function: accelerating from zero velocity. 
QEasingCurve::OutCirc  26  Easing curve for a circular (sqrt(1t^2)) function: decelerating from zero velocity. 
QEasingCurve::InOutCirc  27  Easing curve for a circular (sqrt(1t^2)) function: acceleration until halfway, then deceleration. 
QEasingCurve::OutInCirc  28  Easing curve for a circular (sqrt(1t^2)) function: deceleration until halfway, then acceleration. 
QEasingCurve::InElastic  29  Easing curve for an elastic (exponentially decaying sine wave) function: accelerating from zero velocity. The peak amplitude can be set with the amplitude parameter, and the period of decay by the period parameter. 
QEasingCurve::OutElastic  30  Easing curve for an elastic (exponentially decaying sine wave) function: decelerating from zero velocity. The peak amplitude can be set with the amplitude parameter, and the period of decay by the period parameter. 
QEasingCurve::InOutElastic  31  Easing curve for an elastic (exponentially decaying sine wave) function: acceleration until halfway, then deceleration. 
QEasingCurve::OutInElastic  32  Easing curve for an elastic (exponentially decaying sine wave) function: deceleration until halfway, then acceleration. 
QEasingCurve::InBack  33  Easing curve for a back (overshooting cubic function: (s+1)*t^3  s*t^2) easing in: accelerating from zero velocity. 
QEasingCurve::OutBack  34  Easing curve for a back (overshooting cubic function: (s+1)*t^3  s*t^2) easing out: decelerating to zero velocity. 
QEasingCurve::InOutBack  35  Easing curve for a back (overshooting cubic function: (s+1)*t^3  s*t^2) easing in/out: acceleration until halfway, then deceleration. 
QEasingCurve::OutInBack  36  Easing curve for a back (overshooting cubic easing: (s+1)*t^3  s*t^2) easing out/in: deceleration until halfway, then acceleration. 
QEasingCurve::InBounce  37  Easing curve for a bounce (exponentially decaying parabolic bounce) function: accelerating from zero velocity. 
QEasingCurve::OutBounce  38  Easing curve for a bounce (exponentially decaying parabolic bounce) function: decelerating from zero velocity. 
QEasingCurve::InOutBounce  39  Easing curve for a bounce (exponentially decaying parabolic bounce) function easing in/out: acceleration until halfway, then deceleration. 
QEasingCurve::OutInBounce  40  Easing curve for a bounce (exponentially decaying parabolic bounce) function easing out/in: deceleration until halfway, then acceleration. 
QEasingCurve::Custom  45  This is returned if the user specified a custom curve type with setCustomType(). Note that you cannot call setType() with this value, but type() can return it. 
Constructs an easing curve of the given type.
Construct a copy of other.
Destructor.
Returns the amplitude. This is not applicable for all curve types. It is only applicable for bounce and elastic curves (curves of type() QEasingCurve::InBounce, QEasingCurve::OutBounce, QEasingCurve::InOutBounce, QEasingCurve::OutInBounce, QEasingCurve::InElastic, QEasingCurve::OutElastic, QEasingCurve::InOutElastic or QEasingCurve::OutInElastic).
See also setAmplitude().
Returns the function pointer to the custom easing curve. If type() does not return QEasingCurve::Custom, this function will return 0.
See also setCustomType().
Returns the overshoot. This is not applicable for all curve types. It is only applicable if type() is QEasingCurve::InBack, QEasingCurve::OutBack, QEasingCurve::InOutBack or QEasingCurve::OutInBack.
See also setOvershoot().
Returns the period. This is not applicable for all curve types. It is only applicable if type() is QEasingCurve::InElastic, QEasingCurve::OutElastic, QEasingCurve::InOutElastic or QEasingCurve::OutInElastic.
See also setPeriod().
Sets the amplitude to amplitude.
This will set the amplitude of the bounce or the amplitude of the elastic "spring" effect. The higher the number, the higher the amplitude.
See also amplitude().
Sets a custom easing curve that is defined by the user in the function func. The signature of the function is qreal myEasingFunction(qreal progress), where progress and the return value is considered to be normalized between 0 and 1. (In some cases the return value can be outside that range) After calling this function type() will return QEasingCurve::Custom. func cannot be zero.
See also customType() and valueForProgress().
Sets the overshoot to overshoot.
0 produces no overshoot, and the default value of 1.70158 produces an overshoot of 10 percent.
See also overshoot().
Sets the period to period. Setting a small period value will give a high frequency of the curve. A large period will give it a small frequency.
See also period().
Sets the type of the easing curve to type.
See also type().
Returns the type of the easing curve.
See also setType().
Return the effective progress for the easing curve at progress. While progress must be between 0 and 1, the returned effective progress can be outside those bounds. For instance, QEasingCurve::InBack will return negative values in the beginning of the function.
Compare this easing curve with other and returns true if they are not equal. It will also compare the properties of a curve.
See also operator==().
Copy other.
Compare this easing curve with other and returns true if they are equal. It will also compare the properties of a curve.
Copyright © 2009 Nokia Corporation and/or its subsidiary(ies)  Trademarks  Qt 4.6.0 
Попытка перевода Qt документации. Если есть желание присоединиться, или если есть замечания или пожелания, то заходите на форум: Перевод Qt документации на русский язык... Люди внесшие вклад в перевод: Команда переводчиков 