OffsetAnimator


Source link: https://github.com/russelarms/OffsetAnimator

OffsetAnimator

OffsetAnimator lets animate objects basing on touchevents, so users can be engaged in an animation process.

Usage

Add the library to your project:

  1. Add it in your root build.gradle at the end of repositories:
allprojects {

  repositories {

...

maven {
 url 'https://jitpack.io' 
}

  
}
 
}
  1. Add the dependency:
dependencies {

  compile 'com.github.russelarms:offsetanimator:1.0.2' 
}

Requirements

Min sdk version is 11. The library doesn't have any transitive dependencies.

Tutorial

A Comprehensive tutorial.

Scene

To create viewpager-based animation you should bind a scene to position updates:

ViewPagerAnimatorAdapter animatorAdapter = new ViewPagerAnimatorAdapter(scene.getScene());
 viewPager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {

@Override
  public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

super.onPageScrolled(position, positionOffset, positionOffsetPixels);

animatorAdapter.onPageScrolled(position, positionOffset);

  
}
 
}
);

Then create a scene instance and pass it a root view and an initializer function:

Scene.create(getRootView(), () -> initSteps());

Scripting

Script desired animation like this:

private void initSteps() {

  scene.page(0).step(0)

 .createAnimation(ocean.getY(), ocean.getY() - convertDIPToPixels(getContext(), 120))

 .setStartThreshold(0.5f)

 .setDuration(0.8f)

 .setInterpolator(new DecelerateInterpolator())

 .setListener(value -> ocean.setY(value));
 
}

A single page is taken as 1.0f. So duration 0.5f is a half of a distance.

Lazy initialization

It is not always convenient to specify exact view positions after some script done, so we can pass a lazy initializer. In this example animator will be initialized only on page 3 with corresponding coordinates:

scene.page(3).step(3)

.createAnimation(() -> AnimatorFactory.createAnimator(fishLeftBottom.getY(), fishLeftBottom.getY() + screenDimensions.y / 2))

.setDuration(0.5f)

.setListener(value -> fishLeftBottom.setY(value));

Here's how to set the rotation:

scene.page(2).step(2)

.createAnimation(0, 90)

.setDuration(0.25f)

.setListener(value -> submarine.setRotation(value));

Interpolators

We can specify an interpolator (from android.view.animation). The library ships its own SpringInterpolator:

scene.page(1).step(0)

.createAnimation(1926, 1032)

.setInterpolator(new SpringInterpolator(0.8f))

.setListener(value -> submarine.setY(value));

Arc animations

Create arc animation:

scene.page(2).step(1)

.createAnimation(() -> AnimatorFactory.createArcAnimator(submarine,

  Utils.centerX(submarine),

  convertDIPToPixels(getContext(), 48),

  submarine.getX() + submarine.getWidth() / 2,

  Utils.centerY(submarine),

  180f, Side.RIGHT))

.setStartThreshold(0.5f)

.setDuration(0.5f);

While standard OffsetAnimator requires user to set listeners and update fields by hand, arc animator doesn't need listener: it assigns value implicitly.

Inheritance

OffsetAnimator is open to be inherited:

public class AnotherOffsetAnimator extends OffsetAnimator {

public AnotherOffsetAnimator(float x1, float x2) {

super(x1, x2);

  
}

@Override
  public void animate(float position) {

super.animate(position);

  
}
 
}

and to be used with a scene:

scene.page(3).step(1)

.createAnimation(() -> new AnotherOffsetAnimator(fishRight.getX(), fishRight.getX() + convertDIPToPixels(getContext(), 160)))

.setDuration(0.5f)

.setListener(value -> fishRight.setX(value));

License

OffsetAnimator is available under the MIT license. See the LICENSE file for more info. The library uses some code from https://github.com/asyl/ArcAnimator for arc animations.

The submarine and the fish images picked from freepik.com: Designed by Freepik Background vector created by Freepik

Copyright 2017 russelarms.

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Topics


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