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feat: Generalise directions for the submarine #2

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feat: Generalise directions for the submarine #2

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598cc32
feat: Generalize directions for the submarine
maazadeeb Mar 15, 2021
3ef89a2
chore: Try same prettier config
maazadeeb Mar 15, 2021
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67 changes: 30 additions & 37 deletions src/components/submarine.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,14 @@ import { h } from 'preact';
import { useEffect, useRef, useState } from 'preact/hooks';
import { useTwitchChat } from '@socket-studio/preact';

// (x, y) directions for various commands
const directions = {
up: [0, -1],
down: [0, 1],
left: [-1, 0],
right: [1, 0],
};

export function Submarine() {
const [image, setImage] = useState('submarine');
const { currentCommand: command } = useTwitchChat(
Expand All @@ -22,55 +30,40 @@ export function Submarine() {
return;
}

if (
!command ||
!['up', 'down', 'left', 'right'].includes(command.command)
) {
if (!command || !Object.keys(directions).includes(command.command)) {
return;
}

const currentCommand = command.command;
const wrapper = ref.current;
const submarine = wrapper.querySelector('.submarine');
const styles = window.getComputedStyle(submarine);

const MOVEMENT_DISTANCE = 30;

switch (command.command) {
case 'left':
const currentLeft = parseInt(styles.getPropertyValue('left')); // => '0px' -> 0
const newLeft =
currentLeft > MOVEMENT_DISTANCE ? currentLeft - MOVEMENT_DISTANCE : 0;
submarine.style.left = `${newLeft}px`;
submarine.style.transform = 'scaleX(1)';
return;

case 'right':
const current = parseInt(styles.getPropertyValue('left'));
const maxLeft = wrapper.getBoundingClientRect().width - 100;
const newLeft2 =
current < maxLeft - MOVEMENT_DISTANCE
? current + MOVEMENT_DISTANCE
: maxLeft;

submarine.style.left = `${newLeft2}px`;
submarine.style.transform = 'scaleX(-1)';
return;
const wrapperRect = wrapper.getBoundingClientRect();
const maxLeft = wrapperRect.width - 100;
const maxTop = wrapperRect.height - 30;

case 'up':
case 'down':
const direction = command.command === 'up' ? -1 : 1;
const distance = MOVEMENT_DISTANCE * direction;
const currentLeft = parseInt(styles.getPropertyValue('left'), 10);
const currentTop = parseInt(styles.getPropertyValue('top'), 10);

const currentTop = parseInt(styles.getPropertyValue('top'));
const maxTop = wrapper.getBoundingClientRect().height - 30;
const nextLeft =
currentLeft + directions[currentCommand][0] * MOVEMENT_DISTANCE;
const nextTop =
currentTop + directions[currentCommand][1] * MOVEMENT_DISTANCE;

let newTop = currentTop;
if (currentTop + distance < maxTop && currentTop + distance > 0) {
newTop = currentTop + distance;
}

submarine.style.top = `${newTop}px`;
return;
if (nextLeft !== currentLeft && nextLeft > 0 && nextLeft < maxLeft) {
submarine.style.left = `${nextLeft}px`;
submarine.style.transform = `scaleX(${
-1 * directions[currentCommand][0]
})`;
}
if (nextTop !== currentTop && nextTop > 0 && nextTop < maxTop) {
submarine.style.top = `${nextTop}px`;
submarine.style.transform = `rotate(${
-90 * directions[currentCommand][1]
}deg)`;
}
}, [command]);

Expand Down