how to create a game using javascript

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Astrid
21 Sep 2019
1<html>
2<head>
3<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
4<style>
5canvas {
6    border:1px solid #d3d3d3;
7    background-color: #f1f1f1;
8}
9</style>
10</head>
11<body onload="startGame()">
12<script>
13
14var myGamePiece;
15var myObstacles = [];
16var myScore;
17
18function startGame() {
19    myGamePiece = new component(30, 30, "red", 10, 120);
20    myGamePiece.gravity = 0.05;
21    myScore = new component("30px", "Consolas", "black", 280, 40, "text");
22    myGameArea.start();
23}
24
25var myGameArea = {
26    canvas : document.createElement("canvas"),
27    start : function() {
28        this.canvas.width = 480;
29        this.canvas.height = 270;
30        this.context = this.canvas.getContext("2d");
31        document.body.insertBefore(this.canvas, document.body.childNodes[0]);
32        this.frameNo = 0;
33        this.interval = setInterval(updateGameArea, 20);
34        },
35    clear : function() {
36        this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
37    }
38}
39
40function component(width, height, color, x, y, type) {
41    this.type = type;
42    this.score = 0;
43    this.width = width;
44    this.height = height;
45    this.speedX = 0;
46    this.speedY = 0;    
47    this.x = x;
48    this.y = y;
49    this.gravity = 0;
50    this.gravitySpeed = 0;
51    this.update = function() {
52        ctx = myGameArea.context;
53        if (this.type == "text") {
54            ctx.font = this.width + " " + this.height;
55            ctx.fillStyle = color;
56            ctx.fillText(this.text, this.x, this.y);
57        } else {
58            ctx.fillStyle = color;
59            ctx.fillRect(this.x, this.y, this.width, this.height);
60        }
61    }
62    this.newPos = function() {
63        this.gravitySpeed += this.gravity;
64        this.x += this.speedX;
65        this.y += this.speedY + this.gravitySpeed;
66        this.hitBottom();
67    }
68    this.hitBottom = function() {
69        var rockbottom = myGameArea.canvas.height - this.height;
70        if (this.y > rockbottom) {
71            this.y = rockbottom;
72            this.gravitySpeed = 0;
73        }
74    }
75    this.crashWith = function(otherobj) {
76        var myleft = this.x;
77        var myright = this.x + (this.width);
78        var mytop = this.y;
79        var mybottom = this.y + (this.height);
80        var otherleft = otherobj.x;
81        var otherright = otherobj.x + (otherobj.width);
82        var othertop = otherobj.y;
83        var otherbottom = otherobj.y + (otherobj.height);
84        var crash = true;
85        if ((mybottom < othertop) || (mytop > otherbottom) || (myright < otherleft) || (myleft > otherright)) {
86            crash = false;
87        }
88        return crash;
89    }
90}
91
92function updateGameArea() {
93    var x, height, gap, minHeight, maxHeight, minGap, maxGap;
94    for (i = 0; i < myObstacles.length; i += 1) {
95        if (myGamePiece.crashWith(myObstacles[i])) {
96            return;
97        } 
98    }
99    myGameArea.clear();
100    myGameArea.frameNo += 1;
101    if (myGameArea.frameNo == 1 || everyinterval(150)) {
102        x = myGameArea.canvas.width;
103        minHeight = 20;
104        maxHeight = 200;
105        height = Math.floor(Math.random()*(maxHeight-minHeight+1)+minHeight);
106        minGap = 50;
107        maxGap = 200;
108        gap = Math.floor(Math.random()*(maxGap-minGap+1)+minGap);
109        myObstacles.push(new component(10, height, "green", x, 0));
110        myObstacles.push(new component(10, x - height - gap, "green", x, height + gap));
111    }
112    for (i = 0; i < myObstacles.length; i += 1) {
113        myObstacles[i].x += -1;
114        myObstacles[i].update();
115    }
116    myScore.text="SCORE: " + myGameArea.frameNo;
117    myScore.update();
118    myGamePiece.newPos();
119    myGamePiece.update();
120}
121
122function everyinterval(n) {
123    if ((myGameArea.frameNo / n) % 1 == 0) {return true;}
124    return false;
125}
126
127function accelerate(n) {
128    myGamePiece.gravity = n;
129}
130</script>
131<br>
132<button onmousedown="accelerate(-0.2)" onmouseup="accelerate(0.05)">ACCELERATE</button>
133<p>Use the ACCELERATE button to stay in the air</p>
134<p>How long can you stay alive?</p>
135</body>
136</html>
Mirko
02 Jun 2019
1//Javascript game template
2//Move player with arrow keys
3
4var canvas = document.createElement("canvas");
5canvas.width = 500;
6canvas.height = 500;
7document.body.appendChild(canvas);
8var ctx = canvas.getContext("2d");
9
10var player = {x: canvas.width / 2, y: canvas.height / 2, speed: 10};
11var keys = [];
12
13function update() {
14  ctx.clearRect(0, 0, canvas.width, canvas.height);
15  
16  ctx.beginPath();
17  ctx.fillStyle = "red";
18  ctx.fillRect(player.x, player.y, 50, 50);
19  
20  if (keys[37])
21    player.x -= player.speed;
22  if (keys[38])
23    player.y -= player.speed;
24  if (keys[39])
25    player.x += player.speed;
26  if (keys[40])
27    player.y += player.speed;
28  
29  requestAnimationFrame(update);
30}
31update();
32
33document.onkeydown = function(e) {
34  keys[e.keyCode] = true;
35}
36document.onkeyup = function(e) {
37  keys[e.keyCode] = false;
38}
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