content: package com.airbnb.lottie.animation.content;
  
  import android.graphics.Path;
  import android.graphics.PointF;
  
  import androidx.annotation.Nullable;
  
  import com.airbnb.lottie.LottieDrawable;
  import com.airbnb.lottie.LottieProperty;
  import com.airbnb.lottie.animation.keyframe.BaseKeyframeAnimation;
  import com.airbnb.lottie.model.KeyPath;
  import com.airbnb.lottie.model.content.CircleShape;
  import com.airbnb.lottie.model.content.ShapeTrimPath;
  import com.airbnb.lottie.model.layer.BaseLayer;
  import com.airbnb.lottie.utils.MiscUtils;
  import com.airbnb.lottie.value.LottieValueCallback;
  
  import java.util.List;
  
  public class EllipseContent
      implements PathContent, BaseKeyframeAnimation.AnimationListener, KeyPathElementContent {
    private static final float ELLIPSE_CONTROL_POINT_PERCENTAGE = 0.55228f;
  
    private final Path path = new Path();
  
    private final String name;
    private final LottieDrawable lottieDrawable;
    private final BaseKeyframeAnimation<?, PointF> sizeAnimation;
    private final BaseKeyframeAnimation<?, PointF> positionAnimation;
    private final CircleShape circleShape;
  
    private final CompoundTrimPathContent trimPaths = new CompoundTrimPathContent();
    private boolean isPathValid;
  
    public EllipseContent(LottieDrawable lottieDrawable, BaseLayer layer, CircleShape circleShape) {
      name = circleShape.getName();
      this.lottieDrawable = lottieDrawable;
      sizeAnimation = circleShape.getSize().createAnimation();
      positionAnimation = circleShape.getPosition().createAnimation();
      this.circleShape = circleShape;
  
      layer.addAnimation(sizeAnimation);
      layer.addAnimation(positionAnimation);
  
      sizeAnimation.addUpdateListener(this);
      positionAnimation.addUpdateListener(this);
    }
  
    @Override public void onValueChanged() {
      invalidate();
    }
  
    private void invalidate() {
      isPathValid = false;
      lottieDrawable.invalidateSelf();
    }
  
    @Override public void setContents(List<Content> contentsBefore, List<Content> contentsAfter) {
      for (int i = 0; i < contentsBefore.size(); i++) {
        Content content = contentsBefore.get(i);
        if (content instanceof TrimPathContent && ((TrimPathContent) content).getType() == ShapeTrimPath.Type.SIMULTANEOUSLY) {
          TrimPathContent trimPath = (TrimPathContent) content;
          trimPaths.addTrimPath(trimPath);
          trimPath.addListener(this);
        }
      }
    }
  
    @Override public String getName() {
      return name;
    }
  
    @Override public Path getPath() {
      if (isPathValid) {
        return path;
      }
  
      path.reset();
  
      if (circleShape.isHidden()) {
        isPathValid = true;
        return path;
      }
  
      PointF size = sizeAnimation.getValue();
      float halfWidth = size.x / 2f;
      float halfHeight = size.y / 2f;
      // TODO: handle bounds
  
      float cpW = halfWidth * ELLIPSE_CONTROL_POINT_PERCENTAGE;
      float cpH = halfHeight * ELLIPSE_CONTROL_POINT_PERCENTAGE;
  
      path.reset();
      if (circleShape.isReversed()) {
        path.moveTo(0, -halfHeight);
        path.cubicTo(0 - cpW, -halfHeight, -halfWidth, 0 - cpH, -halfWidth, 0);
        path.cubicTo(-halfWidth, 0 + cpH, 0 - cpW, halfHeight, 0, halfHeight);
        path.cubicTo(0 + cpW, halfHeight, halfWidth, 0 + cpH, halfWidth, 0);
        path.cubicTo(halfWidth, 0 - cpH, 0 + cpW, -halfHeight, 0, -halfHeight);
      } else {
        path.moveTo(0, -halfHeight);
        path.cubicTo(0 + cpW, -halfHeight, halfWidth, 0 - cpH, halfWidth, 0);
        path.cubicTo(halfWidth, 0 + cpH, 0 + cpW, halfHeight, 0, halfHeight);
        path.cubicTo(0 - cpW, halfHeight, -halfWidth, 0 + cpH, -halfWidth, 0);
        path.cubicTo(-halfWidth, 0 - cpH, 0 - cpW, -halfHeight, 0, -halfHeight);
      }
  
      PointF position = positionAnimation.getValue();
      path.offset(position.x, position.y);
  
      path.close();
  
      trimPaths.apply(path);
  
      isPathValid = true;
      return path;
    }
  
    @Override public void resolveKeyPath(
        KeyPath keyPath, int depth, List<KeyPath> accumulator, KeyPath currentPartialKeyPath) {
      MiscUtils.resolveKeyPath(keyPath, depth, accumulator, currentPartialKeyPath, this);
    }
  
    @SuppressWarnings("unchecked")
    @Override
    public <T> void addValueCallback(T property, @Nullable LottieValueCallback<T> callback) {
      if (property == LottieProperty.ELLIPSE_SIZE) {
        sizeAnimation.setValueCallback((LottieValueCallback<PointF>) callback);
      } else if (property == LottieProperty.POSITION) {
        positionAnimation.setValueCallback((LottieValueCallback<PointF>) callback);
      }
    }
  }
  