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2. Core Animator 1 5 – Create Stunning Animations Using
3. Core Animator 1 5 – Create Stunning Animations Step By Step

3D Core Team: Heiko van der Scherm. Writer, Director, Design, Modeling Bernhard Haux.Character TD Flower main actors Goro Fujita. Core Animator is helping iOS and Mac developers create stunning animations using simple visual tools. They can focus on creating animations and Core Animator will take care of the Objective-C or Swift code.

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The animation framework aims to provide an easy way for creating animated and smooth GUIs. By animating Qt properties, the framework provides great freedom for animating widgets and other QObjects. The framework can also be used with the Graphics View framework. Many of the concepts available in the animation framework are also available in Qt Quick, where it offers a declarative way of defining animations. Much of the knowledge acquired about the animation framework can be applied to Qt Quick.

In this overview, we explain the basics of its architecture. We also show examples of the most common techniques that the framework allows for animating QObjects and graphics items.

The Animation Architecture

We will in this section take a high-level look at the animation framework's architecture and how it is used to animate Qt properties. The following diagram shows the most important classes in the animation framework.

The animation framework foundation consists of the base class QAbstractAnimation, and its two subclasses QVariantAnimation and QAnimationGroup. QAbstractAnimation is the ancestor of all animations. It represents basic properties that are common for all animations in the framework; notably, the ability to start, stop, and pause an animation. It is also receives the time change notifications.

The animation framework further provides the QPropertyAnimation class, which inherits QVariantAnimation and performs animation of a Qt property, which is part of Qt's meta-object system. The class performs an interpolation over the property using an easing curve. So when you want to animate a value, you can declare it as a property and make your class a QObject. Note that this gives us great freedom in animating already existing widgets and other QObjects.

Complex animations can be constructed by building a tree structure of QAbstractAnimations. The tree is built by using QAnimationGroups, which function as containers for other animations. Note also that the groups are subclasses of QAbstractAnimation, so groups can themselves contain other groups.

The animation framework can be used on its own, but is also designed to be part of the state machine framework (See the state machine framework for an introduction to the Qt state machine). The state machine provides a special state that can play an animation. A QState can also set properties when the state is entered or exited, and this special animation state will interpolate between these values when given a QPropertyAnimation. We will look more closely at this later.

Behind the scenes, the animations are controlled by a global timer, which sends updates to all animations that are playing.

For detailed descriptions of the classes' function and roles in the framework, please look up their class descriptions.

Classes in the Animation Framework

These classes provide a framework for creating both simple and complex animations.

Animating Qt Properties

As mentioned in the previous section, the QPropertyAnimation class can interpolate over Qt properties. It is often this class that should be used for animation of values; in fact, its superclass, QVariantAnimation, has an empty implementation of updateCurrentValue(), and does not change any value unless we change it ourselves on the valueChanged signal.

A major reason we chose to animate Qt properties is that it presents us with freedom to animate already existing classes in the Qt API. Notably, the QWidget class (which we can also embed in a QGraphicsView) has properties for its bounds, colors, etc. Let's look at a small example:

This code will move button from the top left corner of the screen to the position (250, 250) in 10 seconds (10000 milliseconds).

The example above will do a linear interpolation between the start and end value. It is also possible to set values situated between the start and end value. The interpolation will then go by these points.

In this example, the animation will take the button to (250, 250) in 8 seconds, and then move it back to its original position in the remaining 2 seconds. The movement will be linearly interpolated between these points.

You also have the possibility to animate values of a QObject that is not declared as a Qt property. The only requirement is that this value has a setter. You can then subclass the class containing the value and declare a property that uses this setter. Note that each Qt property requires a getter, so you will need to provide a getter yourself if this is not defined.

In the above code example, we subclass QGraphicsRectItem and define a geometry property. We can now animate the widgets geometry even if QGraphicsRectItem does not provide the geometry property.

For a general introduction to the Qt property system, see its overview.

Animations and the Graphics View Framework

Animator Free

When you want to animate QGraphicsItems, you also use QPropertyAnimation. However, QGraphicsItem does not inherit QObject. A good solution is to subclass the graphics item you wish to animate. This class will then also inherit QObject. This way, QPropertyAnimation can be used for QGraphicsItems. The example below shows how this is done. Another possibility is to inherit QGraphicsWidget, which already is a QObject.

As described in the previous section, we need to define properties that we wish to animate.

Note that QObject must be the first class inherited as the meta-object system demands this.

Easing Curves

As mentioned, QPropertyAnimation performs an interpolation between the start and end property value. In addition to adding more key values to the animation, you can also use an easing curve. Easing curves describe a function that controls how the speed of the interpolation between 0 and 1 should be, and are useful if you want to control the speed of an animation without changing the path of the interpolation.

Here the animation will follow a curve that makes it bounce like a ball as if it was dropped from the start to the end position. QEasingCurve has a large collection of curves for you to choose from. These are defined by the QEasingCurve::Type enum. If you are in need of another curve, you can also implement one yourself, and register it with QEasingCurve.

Putting Animations Together

An application will often contain more than one animation. For instance, you might want to move more than one graphics item simultaneously or move them in sequence after each other.

The subclasses of QAnimationGroup (QSequentialAnimationGroup and QParallelAnimationGroup) are containers for other animations so that these animations can be animated either in sequence or parallel. The QAnimationGroup is an example of an animation that does not animate properties, but it gets notified of time changes periodically. This enables it to forward those time changes to its contained animations, and thereby controlling when its animations are played.

Let's look at code examples that use both QSequentialAnimationGroup and QParallelAnimationGroup, starting off with the latter.

Core Animator 1 5 – Create Stunning Animations Using

A parallel group plays more than one animation at the same time. Calling its start() function will start all animations it governs.

As you no doubt have guessed, QSequentialAnimationGroup plays its animations in sequence. It starts the next animation in the list after the previous is finished.

Since an animation group is an animation itself, you can add it to another group. This way, you can build a tree structure of animations which specifies when the animations are played in relation to each other.

Animations and States

When using a state machine, we can associate one or more animations to a transition between states using a QSignalTransition or QEventTransition class. These classes are both derived from QAbstractTransition, which defines the convenience function addAnimation() that enables the appending of one or more animations triggered when the transition occurs.

We also have the possibility to associate properties with the states rather than setting the start and end values ourselves. Below is a complete code example that animates the geometry of a QPushButton.

Core Animator 1 5 – Create Stunning Animations Step By Step

For a more comprehensive example of how to use the state machine framework for animations, see the states example (it lives in the examples/animation/states directory).

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