视频直播源码，android动画小飞机旋转效果

视频直播源码，android动画小飞机旋转效果

//小飞机旋转动效果
public class PlaneView extends View {
    private Paint paint;
    private int width;
    private int height;
    private float curLength;
    private float allLength;
    private float mAnimatorValue;
    private PathMeasure pathMeasure;
    private Path path;
    private float[] pos;
    private float[] tan;
    private Bitmap bitmap;
    private Matrix mMatrix;
    private boolean first;
    public PlaneView(Context context) {
        super(context);
        init();
    }
    public PlaneView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }
    public PlaneView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }
    private void init() {
        paint = new Paint();
        paint.setStrokeWidth(2);
        paint.setAntiAlias(true);
        paint.setColor(Color.GREEN);
        paint.setStyle(Paint.Style.STROKE);
        path = new Path();
        pathMeasure = new PathMeasure();
        first = true;
        pos = new float[2];
        tan = new float[2];
        mMatrix = new Matrix();
        drawbitmap();
        //属性动画
        final ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, 1);
        //设置动画过程的监听
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                mAnimatorValue = (float) animation.getAnimatedValue();
                postInvalidate();
            }
        });
        valueAnimator.setDuration(2000);
        valueAnimator.setRepeatCount(ValueAnimator.INFINITE);//无限循环
        valueAnimator.start();
    }
    //单独创建一个100，100的bitmap画小飞机
    private void drawbitmap() {
        Canvas canvas = new Canvas();
        bitmap = Bitmap.createBitmap(100, 100, Bitmap.Config.ARGB_8888);
        canvas.setBitmap(bitmap);
        Path path = new Path();
        path.moveTo(70, 70);
        path.lineTo(50, 90);
        path.lineTo(50, 50);
        path.close();
        canvas.drawPath(path, paint);
    }
    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (first) {
            width = getWidth();
            height = getHeight();
            path.addCircle(width / 2, height / 2, 250, Path.Direction.CW);
            pathMeasure.setPath(path, false);
            allLength = pathMeasure.getLength();
            first = false;
        }
        //画坐标轴和圆路径
        canvas.drawLine(width / 2, 0, width / 2, height, paint);
        canvas.drawLine(0, height / 2, width, height / 2, paint);
        canvas.drawPath(path, paint);
        //以curlength获取每一次圆上的点的坐标位置以及正切点位置。
        pathMeasure.getPosTan(curLength, pos, tan);
        // 以当前点的位置计算bitmap要旋转的角度，Math.atan2(tan[1], tan[0])获取弧度值，根据弧度与角度换算公式，Math.atan2(tan[1], tan[0]) * 180.0 / Math.PI为每一次的角度
        float degrees = (float) (Math.atan2(tan[1], tan[0]) * 180.0 / Math.PI);
        // 旋转，以70，70这个飞机头点为旋转基点
        mMatrix.postRotate(degrees, 70, 70);
        //平移，以70，70这个飞机头点为旋平移基点
        mMatrix.postTranslate(pos[0] - 70, pos[1] - 70);
        canvas.drawBitmap(bitmap, mMatrix, paint);
        mMatrix.reset();
        curLength = mAnimatorValue * allLength;
    }
}

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