BoundingBoxView.java

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package org.ros.android.jskAndroidGui;

import java.util.ArrayList;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Point;
import android.graphics.PorterDuff.Mode;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

public class BoundingBoxView extends SurfaceView implements Runnable,
                SurfaceHolder.Callback {

        private ArrayList<Point> points;
        private SurfaceHolder surfaceHolder;
        private Thread thread;
        private Boolean selected;
        private Long selected_time;

        public BoundingBoxView(Context context) {
                super(context);
                surfaceHolder = getHolder();
                surfaceHolder.addCallback(this);
                surfaceHolder.setFormat(PixelFormat.TRANSLUCENT);
                setZOrderOnTop(true);
                points = new ArrayList<Point>();
                selected = false;
        }

        public void setSelect() {
                selected_time = System.currentTimeMillis();
                selected = true;
        }

        public void drawBox(ArrayList<Point> point_list) {
                points = point_list;
        }

        @Override
        public void run() {
                Canvas canvas = null;
                Paint paint = new Paint();
                paint.setStrokeWidth(5);
                paint.setARGB(255, 255, 0, 0);

                while (thread != null) {
                        try {
                                canvas = surfaceHolder.lockCanvas();
                                paint.setStyle(Paint.Style.FILL);
                                canvas.drawColor(0, Mode.CLEAR);
                                canvas.drawColor(Color.TRANSPARENT);

                                if (points.size() >= 2) {
                                        int size = points.size();
                                        paint.setStyle(Paint.Style.STROKE);
                                        if (selected) {
                                                paint.setColor(Color.BLUE);
                                                paint.setTextSize(55);
                                                canvas.drawText("Get Object Image", points.get(0).x,
                                                                points.get(0).y - 30, paint);
                                        } else {
                                                paint.setColor(Color.RED);
                                        }
                                        canvas.drawRect(points.get(0).x, points.get(0).y,
                                                        points.get(size - 1).x, points.get(size - 1).y,
                                                        paint);
                                }

                                if (selected
                                                && System.currentTimeMillis() - selected_time > 2000) {
                                        deleteBox();
                                }
                        } catch (Exception e) {

                        } finally {

                                surfaceHolder.unlockCanvasAndPost(canvas);
                        }
                }
        }

        public void deleteBox() {
                selected = false;
                points.clear();
        }

        @Override
        public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {

        }

        @Override
        public void surfaceCreated(SurfaceHolder arg0) {
                thread = new Thread(this);
                thread.start();
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder arg0) {
                thread = null;
        }

}