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import {Vec2} from '../utils/RTCGameUtils';
export interface JoystickProps {
setIsMoving: (arg0: boolean) => void;
setNextNormalizedDirectionVector: (arg0: Vec2) => void;
setCameraScaleByPinch: (arg0: number) => void;
// isClickRef: React.MutableRefObject<boolean>;
getCameraScale: () => number;
divContainer: HTMLDivElement;
}
export default function Joystick(props: JoystickProps): JSX.Element {
// useRef
const joystickBaseRef = useRef<HTMLImageElement>(null);
const joystickRef = useRef<HTMLImageElement>(null);
const touchStartPosRef = useRef<Vec2>({x: 0, y: 0});
const touchingPosRef = useRef<Vec2>({x: 0, y: 0});
const isClickRef = useRef(false);
const oldTouchesPositions = useRef<Vec2[]>([
{x: 0, y: 0},
{x: 0, y: 0},
]);
const oldCameraScale = useRef(0);
// useContext
const revealJoystickBase = () => {
Iif (!joystickRef.current || !joystickBaseRef.current) return;
const joystickBase = joystickBaseRef.current;
const joystick = joystickRef.current;
const posX = touchStartPosRef.current.x;
const posY = touchStartPosRef.current.y;
Iif (joystickBase === null) return;
Iif (joystick === null) return;
joystickBase.style.left = `${posX - joystickBase.width / 2}px`;
joystickBase.style.top = `${posY - joystickBase.height / 2}px`;
joystickBase.style.visibility = 'visible';
joystick.style.left = `${posX - joystick.width / 2}px`;
joystick.style.top = `${posY - joystick.height / 2}px`;
joystick.style.visibility = 'visible';
};
const hideJoystickBase = () => {
Iif (!joystickRef.current || !joystickBaseRef.current) return;
const joystickBase = joystickBaseRef.current;
const joystick = joystickRef.current;
joystickBase.style.visibility = 'hidden';
joystick.style.visibility = 'hidden';
joystickBase.style.left = '0px';
joystickBase.style.top = '0px';
joystick.style.left = '0px';
joystick.style.top = '0px';
};
const moveJoystick = () => {
Iif (!joystickRef.current || !joystickBaseRef.current) return;
const joystickBase = joystickBaseRef.current;
const joystick = joystickRef.current;
const startPosX = touchStartPosRef.current.x;
const startPosY = touchStartPosRef.current.y;
const endPosX = touchingPosRef.current.x;
const endPosY = touchingPosRef.current.y;
Iif (joystick === null) return;
Iif (joystickBase === null) return;
Iif (!isClickRef.current) return;
const dist2 = Math.sqrt(
Math.pow(endPosX - startPosX, 2) + Math.pow(endPosY - startPosY, 2),
);
const dist1 = joystickBase.width / 2 - joystick.width / 2;
if (dist2 <= dist1) {
const x = endPosX - joystick.width / 2;
const y = endPosY - joystick.height / 2;
joystick.style.left = `${x}px`;
joystick.style.top = `${y}px`;
} else {
joystick.style.left = `${
(dist1 * (endPosX - startPosX)) / dist2 + startPosX - joystick.width / 2
}px`;
joystick.style.top = `${
(dist1 * (endPosY - startPosY)) / dist2 +
startPosY -
joystick.height / 2
}px`;
}
};
const getLen = (pos1: Vec2, pos2: Vec2): number => {
return Math.sqrt(
Math.pow(pos1.x - pos2.x, 2) + Math.pow(pos1.y - pos2.y, 2),
);
};
const getDir = (
pos1: Vec2 = touchingPosRef.current,
pos2: Vec2 = touchStartPosRef.current,
): Vec2 => {
const result: Vec2 = {
x: pos1.x - pos2.x,
y: pos1.y - pos2.y,
};
const len = getLen(pos1, pos2);
Iif (len === 0) {
return {x: 0, y: 1};
}
result.x /= len;
result.y /= len;
return result;
};
const divMouseMoveEventHandler = (e: MouseEvent) => {
e.preventDefault();
touchingPosRef.current = {
x: e.clientX,
y: e.clientY,
};
props.setNextNormalizedDirectionVector(getDir());
moveJoystick();
};
const divMouseDownEventHandler = (e: MouseEvent) => {
e.preventDefault();
// test.current = false;
// console.log(`down ${test.current}`);
isClickRef.current = true;
props.setIsMoving(true);
touchStartPosRef.current = {
x: e.clientX,
y: e.clientY,
};
revealJoystickBase();
};
const divMouseUpEventHandler = (e: MouseEvent) => {
e.preventDefault();
// test.current = true;
// console.log(`up ${test.current}`);
isClickRef.current = false;
props.setIsMoving(false);
hideJoystickBase();
};
const divTouchStartEventHandler = (e: TouchEvent) => {
e.preventDefault();
isClickRef.current = true;
if (e.touches.length === 1) {
props.setIsMoving(true);
touchStartPosRef.current = {
x: e.touches[0].clientX,
y: e.touches[0].clientY,
};
revealJoystickBase();
} else E{
props.setIsMoving(false);
hideJoystickBase();
oldCameraScale.current = props.getCameraScale();
oldTouchesPositions.current[0] = {
x: e.touches[0].clientX,
y: e.touches[0].clientY,
};
oldTouchesPositions.current[1] = {
x: e.touches[1].clientX,
y: e.touches[1].clientY,
};
}
};
const divTouchMoveEventHandler = (e: TouchEvent) => {
e.preventDefault();
if (e.touches.length === 1) {
touchingPosRef.current = {
x: e.touches[0].clientX,
y: e.touches[0].clientY,
};
props.setNextNormalizedDirectionVector(getDir());
moveJoystick();
} else {
hideJoystickBase();
const oldLen = getLen(
oldTouchesPositions.current[0],
oldTouchesPositions.current[1],
);
const newLen = getLen(
{x: e.touches[0].clientX, y: e.touches[0].clientY},
{x: e.touches[1].clientX, y: e.touches[1].clientY},
);
props.setCameraScaleByPinch((oldCameraScale.current * newLen) / oldLen);
}
};
const divTouchEndEventHandler = (e: TouchEvent) => {
e.preventDefault();
isClickRef.current = false;
hideJoystickBase();
props.setIsMoving(false);
if (joystickRef.current && joystickBaseRef.current) {
joystickRef.current.style.left = '0px';
joystickRef.current.style.top = '0px';
joystickBaseRef.current.style.left = '0px';
joystickBaseRef.current.style.top = '0px';
}
};
useEffect(() => {
const divContainer = props.divContainer;
//for Desktop
divContainer.addEventListener('mousedown', divMouseDownEventHandler);
divContainer.addEventListener('mousemove', divMouseMoveEventHandler);
divContainer.addEventListener('mouseup', divMouseUpEventHandler);
//for Phone
divContainer.addEventListener('touchstart', divTouchStartEventHandler);
divContainer.addEventListener('touchmove', divTouchMoveEventHandler);
divContainer.addEventListener('touchend', divTouchEndEventHandler);
return () => {
//for Desktop
divContainer.removeEventListener('mousedown', divMouseDownEventHandler);
divContainer.removeEventListener('mousemove', divMouseMoveEventHandler);
divContainer.removeEventListener('mouseup', divMouseUpEventHandler);
//for Phone
divContainer.removeEventListener('touchstart', divTouchStartEventHandler);
divContainer.removeEventListener('touchmove', divTouchMoveEventHandler);
divContainer.removeEventListener('touchend', divTouchEndEventHandler);
};
}, []);
return (
<>
<img
className="joystickBase"
src="./assets/joystick/joystick.png"
alt="조이스틱베이스"
ref={joystickBaseRef}
/>
<img
className="joystick"
src="./assets/joystick/joystick.png"
alt="조이스틱"
ref={joystickRef}
/>
</>
);
}
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