packages/SystemUI/src/com/android/systemui/Nyandroid.java

/*);
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.systemui;

import android.animation.AnimatorSet;
import android.animation.PropertyValuesHolder;
import android.animation.ObjectAnimator;
import android.animation.TimeAnimator;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.graphics.drawable.AnimationDrawable;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.RectF;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Pair;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.FrameLayout;
import android.widget.ImageView;
import java.util.HashMap;
import java.util.Random;

public class Nyandroid extends Activity {
    final static boolean DEBUG = false;

    public static class Board extends FrameLayout
    {
        public static final boolean FIXED_STARS = true;
        public static final int NUM_CATS = 20;

        static Random sRNG = new Random();

        static float lerp(float a, float b, float f) {
            return (b-a)*f + a;
        }

        static float randfrange(float a, float b) {
            return lerp(a, b, sRNG.nextFloat());
        }

        static int randsign() {
            return sRNG.nextBoolean() ? 1 : -1;
        }

        static <E> E pick(E[] array) {
            if (array.length == 0) return null;
            return array[sRNG.nextInt(array.length)];
        }

        public class FlyingCat extends ImageView {
            public static final float VMAX = 1000.0f;
            public static final float VMIN = 100.0f;

            public float v, vr;

            public float dist;
            public float z;

            public ComponentName component;

            public FlyingCat(Context context, AttributeSet as) {
                super(context, as);
                setImageResource(R.drawable.nyandroid_anim); // @@@

                if (DEBUG) setBackgroundColor(0x80FF0000);
            }

            public String toString() {
                return String.format("<cat (%.1f, %.1f) (%d x %d)>",
                    getX(), getY(), getWidth(), getHeight());
            }

            public void reset() {
                final float scale = lerp(0.1f,2f,z);
                setScaleX(scale); setScaleY(scale);

                setX(-scale*getWidth()+1);
                setY(randfrange(0, Board.this.getHeight()-scale*getHeight()));
                v = lerp(VMIN, VMAX, z);

                dist = 0;

//                android.util.Log.d("Nyandroid", "reset cat: " + this);
            }

            public void update(float dt) {
                dist += v * dt;
                setX(getX() + v * dt);
            }
        }

        TimeAnimator mAnim;

        public Board(Context context, AttributeSet as) {
            super(context, as);

            setLayerType(View.LAYER_TYPE_HARDWARE, null);
            setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
            setBackgroundColor(0xFF003366);
        }

        private void reset() {
//            android.util.Log.d("Nyandroid", "board reset");
            removeAllViews();

            final ViewGroup.LayoutParams wrap = new ViewGroup.LayoutParams(
                        ViewGroup.LayoutParams.WRAP_CONTENT,
                        ViewGroup.LayoutParams.WRAP_CONTENT);

            if (FIXED_STARS) {
                for(int i=0; i<20; i++) {
                    ImageView fixedStar = new ImageView(getContext(), null);
                    if (DEBUG) fixedStar.setBackgroundColor(0x8000FF80);
                    fixedStar.setImageResource(R.drawable.star_anim); // @@@
                    addView(fixedStar, wrap);
                    final float scale = randfrange(0.1f, 1f);
                    fixedStar.setScaleX(scale); fixedStar.setScaleY(scale);
                    fixedStar.setX(randfrange(0, getWidth()));
                    fixedStar.setY(randfrange(0, getHeight()));
                    final AnimationDrawable anim = (AnimationDrawable) fixedStar.getDrawable();
                    postDelayed(new Runnable() { 
                        public void run() {
                            anim.start();
                        }}, (int) randfrange(0, 1000));
                }
            }

            for(int i=0; i<NUM_CATS; i++) {
                FlyingCat nv = new FlyingCat(getContext(), null);
                addView(nv, wrap);
                nv.z = ((float)i/NUM_CATS);
                nv.z *= nv.z;
                nv.reset();
                nv.setX(randfrange(0,Board.this.getWidth()));
                final AnimationDrawable anim = (AnimationDrawable) nv.getDrawable();
                postDelayed(new Runnable() { 
                    public void run() {
                        anim.start();
                    }}, (int) randfrange(0, 1000));
            }

            if (mAnim != null) {
                mAnim.cancel();
            }
            mAnim = new TimeAnimator();
            mAnim.setTimeListener(new TimeAnimator.TimeListener() {
                public void onTimeUpdate(TimeAnimator animation, long totalTime, long deltaTime) {
                    // setRotation(totalTime * 0.01f); // not as cool as you would think
//                    android.util.Log.d("Nyandroid", "t=" + totalTime);

                    for (int i=0; i<getChildCount(); i++) {
                        View v = getChildAt(i);
                        if (!(v instanceof FlyingCat)) continue;
                        FlyingCat nv = (FlyingCat) v;
                        nv.update(deltaTime / 1000f);
                        final float catWidth = nv.getWidth() * nv.getScaleX();
                        final float catHeight = nv.getHeight() * nv.getScaleY();
                        if (   nv.getX() + catWidth < -2
                            || nv.getX() > getWidth() + 2
                            || nv.getY() + catHeight < -2
                            || nv.getY() > getHeight() + 2)
                        {
                            nv.reset();
                        }
                    }
                }
            });
        }

        @Override
        protected void onSizeChanged (int w, int h, int oldw, int oldh) {
            super.onSizeChanged(w,h,oldw,oldh);
//            android.util.Log.d("Nyandroid", "resized: " + w + "x" + h);
            post(new Runnable() { public void run() { 
                reset();
                mAnim.start(); 
            } });
        }


        @Override
        protected void onDetachedFromWindow() {
            super.onDetachedFromWindow();
            mAnim.cancel();
        }

        @Override
        public boolean isOpaque() {
            return true;
        }
    }

    private Board mBoard;

    @Override
    public void onStart() {
        super.onStart();

        getWindow().addFlags(
                  WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
                | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                );
    }

    @Override
    public void onResume() {
        super.onResume();
        mBoard = new Board(this, null);
        setContentView(mBoard);

        mBoard.setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
            @Override
            public void onSystemUiVisibilityChange(int vis) {
                if (0 == (vis & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION)) {
                    Nyandroid.this.finish();
                }
            }
        });
    }

    @Override
    public void onUserInteraction() {
//        android.util.Log.d("Nyandroid", "finishing on user interaction");
        finish();
    }
}