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
|
import {
createRandomBall,
Event,
GAME_SIZE,
PADDLE_HEIGHT,
PADDLE_WIDTH,
SessionState,
} from "../state";
import { Action, Collider } from "./types";
import { applyBallBounce, applyBallVelocity } from "./utils";
export const advanceStateLocal = async (
curState: SessionState,
action: Action | undefined
): Promise<SessionState> => {
//minimum delay
await new Promise((res) => setTimeout(res, 15));
let candidateOutboundEventQueue: Event[] = [];
let candidatePaddle = curState.localPlayerGameState.paddle;
if (action === Action.MOVE_LEFT) {
candidatePaddle.position[0] = Math.max(0, candidatePaddle.position[0] - 1);
} else if (action === Action.MOVE_RIGHT) {
candidatePaddle.position[0] = Math.min(
GAME_SIZE.cols - 1 - PADDLE_WIDTH,
candidatePaddle.position[0] + 1
);
}
let candidateBricks = curState.localPlayerGameState.bricks;
const colliders: Collider[] = [];
//paddle collider
colliders.push({
normal: [0, -1],
boundingBox: [
{
min: candidatePaddle.position[0],
max: candidatePaddle.position[0] + PADDLE_WIDTH,
},
{
min: candidatePaddle.position[1],
max: candidatePaddle.position[1] + PADDLE_HEIGHT,
},
],
});
//brick colliders
candidateBricks.forEach(({ position }, i) => {
colliders.push({
boundingBox: position.map((pos) => ({
min: pos - 0.5,
max: pos + 0.5,
})) as Collider["boundingBox"],
normal: [0, 1],
onHit: () => {
candidateOutboundEventQueue.push({ name: "NEW_BALL" });
candidateBricks.splice(i, 1);
},
});
});
//wall colliders
colliders.push(
...([
//left wall
{
boundingBox: [
{ min: -1, max: 0 },
{ min: 0, max: GAME_SIZE.rows },
],
normal: [1, 0],
},
//top wall
{
boundingBox: [
{ min: -1, max: GAME_SIZE.cols + 1 },
{ min: -1, max: 0 },
],
normal: [0, 1],
},
//right wall
{
boundingBox: [
{ min: GAME_SIZE.cols, max: GAME_SIZE.cols + 1 },
{ min: 0, max: GAME_SIZE.rows },
],
normal: [-1, 0],
},
] satisfies Collider[])
);
const candidateBalls = curState.localPlayerGameState.balls
.map((ball) => {
let candidateBall = applyBallVelocity(ball);
const hitCollider = colliders.find(({ boundingBox }) =>
candidateBall.position.every(
(pos, i) => pos >= boundingBox[i].min && pos <= boundingBox[i].max
)
);
if (hitCollider) {
hitCollider.onHit && hitCollider.onHit();
candidateBall = applyBallBounce(candidateBall, hitCollider.normal);
}
return candidateBall;
})
.filter((ball) => !!ball);
//apply incoming events
for (const event of curState.inboundEventQueue) {
switch (event.name) {
case "NEW_BALL":
candidateBalls.push(createRandomBall());
}
}
return {
...curState,
inboundEventQueue: [],
outboundEventQueue: candidateOutboundEventQueue,
localPlayerGameState: {
...curState.localPlayerGameState,
bricks: candidateBricks,
paddle: candidatePaddle,
balls: candidateBalls,
},
seqno: curState.seqno + 1,
};
};
|
