Pong/script.js at main · ItsaMeChun/Pong · GitHub

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
const canvas = document.querySelector("canvas");
canvas.width = innerWidth;
canvas.height = innerHeight;
const context = canvas.getContext("2d");
class Paddle {
    constructor({position}) {
        this.position = position;
        this.velocity = {x: 0, y: 0};
        this.width = 10;
        this.height = 100;
    }

    draw() {
        context.fillStyle = "white";
        context.fillRect(this.position.x, this.position.y, this.width, this.height);
    }

    update(){
        this.draw();
        if(this.position.y + this.velocity.y > 0 && this.position.y + this.height + this.velocity.y < canvas.height) {
            this.position.y += this.velocity.y;
        }
    }
}

class Ball {
    constructor({position}) {
        const speed = 7;
        const direction = {
            x: (Math.random() - 0.5) >= 0 ? -speed : speed,
            y: (Math.random() - 0.5) >= 0 ? -speed : speed,
        }
        this.position = position;
        this.velocity = {x: direction.x, y: direction.y};
        this.width = 10;
        this.height = 10;
    }

    draw() {
        context.fillStyle = "white";
        context.fillRect(this.position.x, this.position.y, this.width, this.height);
    }

    update() {
        this.draw();
        const rightSide = this.position.x + this.width + this.velocity.x;
        const leftSide = this.position.x + this.velocity.x;
        const bottomSide = this.position.y + this.height + this.velocity.y;
        const topSide = this.position.y + this.velocity.y;

        //Collision with paddle1
        if(leftSide <= paddle1.position.x + paddle1.width && bottomSide >= paddle1.position.y && topSide <= paddle1.position.y + paddle1.height) {
            this.velocity.x = -this.velocity.x;
        }

        //Collision with paddle2
        if(rightSide >= paddle2.position.x && bottomSide >= paddle2.position.y && topSide <= paddle2.position.y + paddle2.height){
            this.velocity.x = -this.velocity.x;
        }

        //Collision with wall
        if(bottomSide >= canvas.height || topSide <= 0) {
            this.velocity.y = -this.velocity.y + Math.random();
        }

        //Over
        if(leftSide <= 0 || rightSide >= canvas.width) {
            context.fillStyle = "white";
            context.font = "20px arial"
            context.fillText("Over", canvas.width / 2, canvas.height / 2)
            return;
        }

        this.position.x += this.velocity.x;
        this.position.y += this.velocity.y;
    }
}
const paddle1 = new Paddle({position: {x: 10, y: 100}})
const paddle2 = new Paddle({position: {x: canvas.width - 10 * 2, y: 100}})
const ball = new Ball({position: {x: canvas.width / 2, y: canvas.height / 2}})
function animate(){
    requestAnimationFrame(animate);
    context.fillStyle = "black";
    context.fillRect(0, 0, canvas.width, canvas.height)
    paddle1.update();
    paddle2.update();
    ball.update();
}
animate();

// MOVE
addEventListener('keydown', (event) => {
    const speed = 20;
    switch(event.key){
        case "w":
            paddle1.velocity.y = -speed;
            break;
        case "s":
            paddle1.velocity.y = speed;
            break;
        case "ArrowUp":
            paddle2.velocity.y = -speed;
            break;
        case "ArrowDown":
            paddle2.velocity.y = speed;
            break;
    }
});

// STOP
addEventListener('keyup', (event) => {
    switch(event.key) {
        case "w":
            if(paddle1.velocity.y < 0) {
                paddle1.velocity.y = 0;
            }
            break;
        case "s":
            if(paddle1.velocity.y > 0) {
                paddle1.velocity.y = 0;
            }
            break;
        case "ArrowUp":
            if(paddle2.velocity.y < 0) {
                paddle2.velocity.y = 0;
            }
            break;
        case "ArrowDown":
            if(paddle2.velocity.y > 0) {
                paddle2.velocity.y = 0;
            }
            break;
    }
});