InterpolationParser.java

package com.reactnativenavigation.options.parsers;


import android.animation.TimeInterpolator;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.LinearInterpolator;
import android.view.animation.OvershootInterpolator;

import com.reactnativenavigation.options.interpolators.DecelerateAccelerateInterpolator;
import com.reactnativenavigation.options.interpolators.SpringInterpolator;

import org.json.JSONObject;

import androidx.interpolator.view.animation.FastOutSlowInInterpolator;

public class InterpolationParser {
    public static TimeInterpolator parse(JSONObject json) {
        JSONObject interpolation = json.optJSONObject("interpolation");
        String type = interpolation == null ? "linear" : interpolation.optString("type", "linear");
        switch (type) {
            case "decelerate": {
                float factor = (float) interpolation.optDouble("factor", 1.0);
                return new DecelerateInterpolator(factor);
            }
            case "accelerateDecelerate": {
                return new AccelerateDecelerateInterpolator();
            }
            case "accelerate": {
                float factor = (float) interpolation.optDouble("factor", 1.0);
                return new AccelerateInterpolator(factor);
            }
            case "decelerateAccelerate": {
                return new DecelerateAccelerateInterpolator();
            }
            case "fastOutSlowIn": {
                return new FastOutSlowInInterpolator();
            }
            case "overshoot": {
                double tension = interpolation.optDouble("tension", 1.0);
                return new OvershootInterpolator((float) tension);
            }
            case "spring": {
                float mass = (float) interpolation.optDouble("mass", 3.0);
                float damping = (float) interpolation.optDouble("damping", 500.0);
                float stiffness = (float) interpolation.optDouble("stiffness", 200.0);
                boolean allowsOverdamping = interpolation.optBoolean("allowsOverdamping", false);
                float initialVelocity = (float) interpolation.optDouble("initialVelocity", 0);
                return new SpringInterpolator(mass, damping, stiffness, allowsOverdamping, initialVelocity);
            }
            case "linear":
            default: {
                return new LinearInterpolator();
            }
        }
    }
}