/*

 * Copyright (C) 2010 Google Inc.

 * 

 * 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.marvin.rocklock;



import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Path;

import android.view.View;



/**

 * Draws an arrow to give the user some visual indication of where they are

 * stroking.

 * 

 * @author clchen@google.com (Charles L. Chen)

 */

public class AnimationLayer extends View {

    private int dir = 5;



    private Path arrow = new Path();



    private Paint paint = new Paint();



    public AnimationLayer(Context context) {

        super(context);

        arrow.moveTo(0, -50);

        arrow.lineTo(-20, 60);

        arrow.lineTo(0, 50);

        arrow.lineTo(20, 60);

        arrow.close();

    }



    public void setDirection(int direction) {

        dir = direction;

        invalidate();

    }



    @Override

    public void onDraw(Canvas canvas) {

        canvas.drawColor(Color.BLACK);



        int w = canvas.getWidth();

        int h = canvas.getHeight();

        int cx = w / 2;

        int cy = (h * 2) / 3;



        paint.setColor(Color.WHITE);



        canvas.translate(cx, cy);

        switch (dir) {

            case 1:

                canvas.rotate(-45);

                break;

            case 2:

                canvas.rotate(0);

                break;

            case 3:

                canvas.rotate(45);

                break;

            case 4:

                canvas.rotate(-90);

                break;

            case 5:

                canvas.rotate(0);

                break;

            case 6:

                canvas.rotate(90);

                break;

            case 7:

                canvas.rotate(-135);

                break;

            case 8:

                canvas.rotate(180);

                break;

            case 9:

                canvas.rotate(135);

                break;

        }



        if ((dir >= 0) && (dir != 5)) {

            canvas.drawPath(arrow, paint);

        }

    }



}