1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
| <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Snake</title>
<style>
canvas {
display: block;
margin: 0 auto;
border: 1px solid black;
}
h1 {
text-align: center;
}
</style>
</head>
<body>
<h1>Snake</h1>
<div class="snakearea">
<canvas id="speelveld" width="800" height="800"></canvas>
<div style="display: none;">
<img id="appel" src="data:image/png;base64,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" >
</div>
</div>
<script>
const speelveld = document.getElementById("speelveld");
const ctx = speelveld.getContext("2d");
const vakGrootte = 25;
const appelGrootte = vakGrootte * 1.2;
const aantalVakjes = speelveld.width / vakGrootte;
const appel = { x: 0, y: 0 };
const slang = [{ x: 10, y: 10 }];
let richting = "rechts";
const appelPlaatje = document.getElementById("appel");
function tekenAppel() {
ctx.drawImage(appelPlaatje, appel.x * vakGrootte, appel.y * vakGrootte, appelGrootte, appelGrootte);
}
function tekenSlang() {
for (let slangDeel of slang) {
ctx.fillStyle = "green";
ctx.fillRect(slangDeel.x * vakGrootte, slangDeel.y * vakGrootte, vakGrootte - 1, vakGrootte - 1);
}
}
function toonGameOver() {
ctx.fillStyle = "orange";
ctx.font = "75px Arial";
ctx.fillText("Game over!", 200, 400);
}
let score = 0;
function toonScore() {
ctx.fillStyle = "black";
ctx.font = "30px Arial";
ctx.fillText(`Score ${score}`, 350, 30);
}
function nieuwePlaatsAppel() {
appel.x = Math.floor(Math.random() * aantalVakjes);
appel.y = Math.floor(Math.random() * aantalVakjes);
}
function verplaatsSlang() {
const nieuweSlangenKop = {...slang[0]};
switch (richting) {
case "omhoog": nieuweSlangenKop.y -= 1; break;
case "omlaag": nieuweSlangenKop.y += 1; break;
case "links": nieuweSlangenKop.x -= 1; break;
case "rechts": nieuweSlangenKop.x += 1; break;
}
slang.unshift(nieuweSlangenKop);
if (nieuweSlangenKop.x === appel.x && nieuweSlangenKop.y === appel.y) {
nieuwePlaatsAppel();
score += 1;
} else {
slang.pop();
}
}
document.addEventListener("keydown", (event) => {
switch (event.key) {
case "ArrowUp": richting = "omhoog"; break
case "ArrowDown": richting = "omlaag"; break
case "ArrowLeft": richting = "links"; break
case "ArrowRight": richting = "rechts"; break
case "o": document.location.reload(); break
}
console.log(richting);
});
function maakSpeelveldLeeg() {
ctx.clearRect(0, 0, speelveld.width, speelveld.height);
}
function slangHeeftZichzelfGeraakt() {
const slangenKop = slang[0];
for (let slangDeel of slang.slice(1)) {
if (slangDeel.x === slangenKop.x && slangDeel.y === slangenKop.y) {
return true;
}
}
return false;
}
function slangHeeftEenRandGeraakt() {
const slangenKop = slang[0];
return slangenKop.x < 0 || slangenKop.x >= aantalVakjes || slangenKop.y < 0 || slangenKop.y >= aantalVakjes;
}
function isGameOver() {
return slangHeeftZichzelfGeraakt() || slangHeeftEenRandGeraakt();
}
function gameLoop() {
if (isGameOver()) {
toonGameOver();
return;
}
maakSpeelveldLeeg();
verplaatsSlang();
tekenAppel();
tekenSlang();
toonScore();
}
nieuwePlaatsAppel();
setInterval(gameLoop, 100);
</script>
</body>
</html>
|