Property Animation

The underlying principle of newcar animations is to continuously change an attribute of an object in each frame. In the quick start, you've already mastered the basic use of newcar animations. Now let's delve into more detail.

How do you define an animation? We have previously learned about the built-in animation create, and in addition to that, newcar has many other built-in animations. Here is a list of commonly used animations:

create
destroy
rotate
move
scale
zoomIn
zoomOut
transparency
fadeIn
fadeOut
...

However, it's not possible for these animations to cover all properties and styles of a Widget. In the ancient versions of newcar, we wrote a corresponding animation for each property, which resulted in an incredibly large bundle size after packaging. This was a loss that was not worth the gain. The new version of newcar uses the changeProperty API and changeStyle API to change the attributes or values of objects. changeProperty and changeStyle are used in the same way, the difference is that one changes properties and the other changes the object's style.

javascript

widget.animate(changeProperty('x', 0, 100))
// Or
widget.animate(changeProperty('x'), {
  from: 0,
  to: 120
})

changeProperty and changeStyle can also change multiple values at the same time

javascript

widget.animate(changeProperty(['x', 'y'], [0, 0], [100, 200]))
// Or
widget.animate(changeProperty('x'), {
  from: [0, 0],
  to: [100, 200]
})

The fourth parameter of animate can include a by field, which is used to set the easing curve of the animation.

The Newcar standard library provides a variety of easing curves, all starting with ease, and you can choose by using code hints or by viewing the function's graph.

Easing curve graph address: https://www.desmos.com/calculator/yasltaa9um

Property Animation ​

Property Animation