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
136
137
138
139
140
141
142
143
144
145
146
|
var canvas = document.getElementById("gameScreen");
var context = canvas.getContext("2d");
var imgBrick = document.getElementById('img_brick');
canvas.width = 1020;
canvas.height = 700;
this.width = 200;
this.height = 20;
this.position = {
x: canvas.width/2 - this.width/2,
y: canvas.height - this.height - 10,
};
this.maxSpeed = 10;
this.speed = 0;
function gameLoop() {
animate();
update();
drawBALL();
changeBALL();
requestAnimationFrame(gameLoop);
}
/** paddleMOVE ********************************************************************/
function animate() {
requestAnimationFrame(animate);
context.clearRect(0, 650, canvas.width, canvas.height);
context.fillStyle = "black";
context.fillRect( this.position.x, this.position.y, this.width, this.height );
}
function update() {
this.position.x += this.speed;
if (this.position.x < 0) {this.position.x = 0}
if (this.position.x > canvas.width - this.width) {this.position.x = canvas.width - this.width}
}
gameLoop();
/** paddleSTEER **************************************************************************/
function moveLeft() {
this.speed = -this.maxSpeed;
}
function moveRight() {
this.speed = this.maxSpeed;
}
function stopp() {
this.speed = 0;
}
document.addEventListener("keydown", event => {
if (event.isComposing || event.keyCode === 37) {
moveLeft();
}
if (event.isComposing || event.keyCode === 39) {
moveRight();
}});
document.addEventListener("keyup", event => {
if (event.isComposing || event.keyCode === 37) {
if(this.speed < 0) {stopp();}
}
if (event.isComposing || event.keyCode === 39) {
if(this.speed > 0) {stopp();}
}});
/** ball & rectangle cooperation ************************************************************************************************/
var x = 200;
var y = 200;
var vx = 8;
var vy = 8;
var radius = 20;
function drawBALL() {
x += vx;
y += vy;
[b]context.clearRect(0, 0, canvas.width, 650);[/b] /*durch dieses clearRect ist das Image, das ich in der Funktion brick() lade, nicht sichtbar..was tun?**/
context.fillStyle = "#FF0080";
context.beginPath();
context.arc(x, y, radius, 0, Math.PI*2, true);
context.closePath();
context.fill();
}
function changeBALL() {
var bottomofBALL = y + radius;
var topofRECT = this.position.y;
var leftRECT = this.position.x;
var rightRECT = this.position.x + this.width;
if ((x + radius) >= canvas.width) {vx = -vx}
if ((x - radius) <= 0) {vx = -vx}
if ((y - radius) <= 0) {vy = -vy}
if (( bottomofBALL >= topofRECT) && (x >= leftRECT) && (x <= rightRECT)){vy = -vy}
if ( y > canvas.height) {vy = 50}
}
/** Image ************************************************************************************************/
[b]function brick() {
imgBrick.onload = function() {
context.drawImage(imgBrick, 10, 10, 100, 100)
}
}[/b]
brick();
|