図形の動きを追従させる関数（ヘビゲーム）の作り方が知りたいです。

Javascriptでヘビゲームを作っているのですが、餌を食べたときにヘビを長くし先頭に追従させる関数でつまずいてしまいました。
ヘビと餌が接触したときに先頭のヘビの後ろに同じ大きさのブロックを作ってsetTimeout()等で少しだけ遅れさせて先頭と同じ動きにすることはできますか？

Javascript
1var canvas = document.getElementById("mycanvas");
2var ctx = canvas.getContext("2d");
3
4
5var snakeX = 300;
6var snakeY = 300;
7
8var rightPress = false;
9var leftPress = false;
10var upPress = false;
11var downPress = false;
12
13var x = Math.random()* 570;
14var y = Math.random()* 570;
15var statu = 1;
16
17var score = 0;
18
19var snakewidth = 20;
20var snakeheight = 20;
21
22
23function drawScore() {
24    ctx.font = '16px Arial';
25    ctx.fillStyle = 'white';
26    ctx.fillText("score:"+score, 8, 16);
27}
28//餌の描画
29function addFood() {
30if(statu==1){
31    ctx.beginPath();
32    ctx.arc(x, y, 10, 0, Math.PI * 2);
33    ctx.fillStyle = "green";
34    ctx.fill();
35    ctx.closePath();
36}
37}
38//接触判定
39function touch() {
40    if(y < snakeY + 30 && y > snakeY - 10){
41        if(x < snakeX + 30 && x > snakeX - 10){
42            statu = 0;
43            x = (Math.random()* 580) + 10;
44            y = (Math.random()* 580) + 10;
45            score += 10;
46            statu = 1;
47        }
48    }
49}
50//ヘビの描画
51function snake() {
52    ctx.beginPath();
53    ctx.rect(snakeX, snakeY, snakewidth, snakeheight);
54    ctx.fillStyle = "green";
55    ctx.fill();
56    ctx.closePath();
57}
58
59function draw() {
60    ctx.clearRect(0, 0, canvas.width, canvas.height);
61    addFood();
62    snake();
63    touch();
64    cope();
65    drawScore();
66
67    if(rightPress) {
68        snakeX += 2;
69    }
70    if(leftPress) {
71        snakeX -= 2;
72    }
73    if(upPress) {
74        snakeY -= 2;
75    }
76    if(downPress) {
77        snakeY += 2;
78    }
79    if(snakeX + 15 > 600) {
80        alert("GAME_OVER");
81        document.location.reload();
82    }
83    if(snakeX < 0) {
84        alert("GAME_OVER");
85        document.location.reload();
86    }
87    if(snakeY + 5 < 0) {
88        alert("GAME_OVER");
89        document.location.reload();
90    }
91    if(snakeY + 20 > 600) {
92        alert("GAME_OVER");
93        document.location.reload();
94    }
95}
96
97document.addEventListener("keydown", keyDownHandler, false);
98document.addEventListener("keyup", keyUpHandler, false);
99
100function keyDownHandler(e) {
101    if(e.key == "Right" || e.key == "ArrowRight") {
102        rightPress = true;
103        if(leftPress == true) {
104            alert("GAME_OVER");
105            document.location.reload();
106        }
107        else {
108            leftPress = false;
109        }
110        upPress = false;
111        downPress = false;
112    }
113    if(e.key == "Left" || e.key == "ArrowLeft") {
114        if(rightPress == true) {
115            alert("GAME_OVER");
116            document.location.reload();
117        }
118        else {
119            rightPress = false;
120        }
121        leftPress = true;
122        upPress = false;
123        downPress = false;    }
124    if(e.key == "Up" || e.key == "ArrowUp") {
125        rightPress = false;
126        leftPress = false;
127        if(downPress == true) {
128            alert("GAME_OVER");
129            document.location.reload();
130        }
131        else {
132            downPress = false;
133        }
134        upPress = true;
135        downPress = false;    }
136    if(e.key == "down" || e.key == "ArrowDown") {
137        rightPress = false;
138        leftPress = false;
139        if(upPress == true) {
140            alert("GAME_OVER");
141            document.location.reload();
142        }
143        else {
144            upPress = false;
145        }
146        upPress = false;
147        downPress = true;    }
148}
149
150function keyUpHandler(e) {
151    if(e.key == "Right" || e.key == "ArrowRight") {
152        rightPress = true;
153        leftPress = false;
154        upPress = false;
155        downPress = false;
156    }
157    if(e.key == "Left" || e.key == "ArrowLeft") {
158        rightPress = false;
159        leftPress = true;
160        upPress = false;
161        downPress = false;
162    }
163    if(e.key == "Up" || e.key == "ArrowUp") {
164        rightPress = false;
165        leftPress = false;
166        upPress = true;
167        downPress = false;
168    }
169    if(e.key == "down" || e.key == "ArrowDown") {
170        rightPress = false;
171        leftPress = false;
172        upPress = false;        
173        downPress = true;
174    }
175}
176
177setInterval(draw, 10);
178
179draw();