1 package org.ocera.orte.demo;
3 import java.util.concurrent.locks.ReentrantLock;
4 import java.util.concurrent.locks.ReentrantReadWriteLock;
5 import java.util.concurrent.locks.ReentrantReadWriteLock.ReadLock;
6 import java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock;
8 import android.content.Context;
9 import android.graphics.Canvas;
10 import android.graphics.Color;
11 import android.graphics.Paint;
12 import android.graphics.Path;
13 import android.graphics.Paint.Style;
14 import android.util.AttributeSet;
15 import android.view.View;
17 public class HokuyoView extends View {
19 public static final double HOKUYO_START_ANGLE = 239.77/2;
20 public static final int HOKUYO_SPLIT_DIVISION = 1024;
21 public static final int HOKUYO_ORIENTATION = 1;
22 public static final double HOKUYO_RANGE_ANGLE_LEFT = 70.0;
23 public static final double HOKUYO_RANGE_ANGLE_RIGHT = 70.0;
24 public static final int HOKUYO_INDEX_LOWER = HOKUYO_DEG_TO_INDEX(HOKUYO_RANGE_ANGLE_LEFT);
25 public static final int HOKUYO_INDEX_UPPER = HOKUYO_DEG_TO_INDEX(-HOKUYO_RANGE_ANGLE_RIGHT);
26 public static final double COSINUS = Math.cos((90-HOKUYO_RANGE_ANGLE_LEFT)/180.0*Math.PI);
28 private int[] data = new int[681];
29 private Paint paint = new Paint();
30 private Path path = new Path();
32 private boolean isRunning = false;
33 private boolean hasBeenDrawn = true;
34 private final ReentrantLock lock = new ReentrantLock();
35 private final ReentrantReadWriteLock controlRrwl = new ReentrantReadWriteLock(true);
36 private final ReadLock rcLock = controlRrwl.readLock();
37 private final WriteLock wcLock = controlRrwl.writeLock();
39 public HokuyoView(Context context, AttributeSet attrs) {
40 super(context, attrs);
42 paint.setStyle(Style.STROKE);
43 paint.setStrokeWidth(4);
44 paint.setColor(Color.BLACK);
45 paint.setAntiAlias(false);
49 protected void onDraw(Canvas canvas) {
55 double norm = (double)getWidth()/(2*COSINUS);
56 if (norm > getHeight())
58 canvas.drawLine((int)(getWidth()*0.95),
59 (int)(getHeight()*0.97),
60 (int)(getWidth()*0.95-norm/4),
61 (int)(getHeight()*0.97),
63 paint.setStrokeWidth(2);
64 canvas.drawText("1 m", (int)(getWidth()*0.95-norm/8), (int)(getHeight()*0.97-10), paint);
65 paint.setStrokeWidth(3);
68 path.moveTo(getWidth()/2, getHeight());
69 for(int i = HOKUYO_INDEX_LOWER+1; i <= HOKUYO_INDEX_UPPER; i++) {
70 data[i] = (int)(((double)data[i]/4000)*norm);
71 int x = (int)(getWidth()/2) - (int)(data[i] * Math.sin(HOKUYO_INDEX_TO_RAD(i)));
72 int y = getHeight() - (int)(data[i] * Math.cos(HOKUYO_INDEX_TO_RAD(i)));
86 canvas.drawPath(path, paint);
92 public void run(boolean run) {
101 public void setData(int[] data) {
102 if (lock.tryLock()) {
104 this.data = data.clone();
105 hasBeenDrawn = false;
114 public static double HOKUYO_INDEX_TO_DEG(int index) {
115 return ((HOKUYO_START_ANGLE-index*360.0/HOKUYO_SPLIT_DIVISION) * HOKUYO_ORIENTATION);
118 public static double HOKUYO_INDEX_TO_RAD(int index) {
119 return (HOKUYO_INDEX_TO_DEG(index)/180.0*Math.PI);
122 public static int HOKUYO_DEG_TO_INDEX(double d) {
123 return (int)((HOKUYO_START_ANGLE-(d)/HOKUYO_ORIENTATION)/(360.0/HOKUYO_SPLIT_DIVISION));