mainlib.js

(function() {
    const scene = new THREE.Scene();
    const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 1, 1000);
    const renderer = new THREE.WebGLRenderer({ antialias: true });
    renderer.setSize(window.innerWidth, window.innerHeight);
    document.body.appendChild(renderer.domElement);

    const labelRenderer = new THREE.CSS2DRenderer();
    labelRenderer.setSize(window.innerWidth, window.innerHeight);
    labelRenderer.domElement.style.position = 'absolute';
    labelRenderer.domElement.style.top = '0px';
    labelRenderer.domElement.style.pointerEvents = 'none';
    document.body.appendChild(labelRenderer.domElement);

    camera.position.z = 5;
    const direction = new THREE.Vector3();
    const euler = new THREE.Euler(0, 0, 0, 'YXZ');
    const uiElements = new Map();
    let elementCounter = 0;

    function createCube() {
        const cubeGeometry = new THREE.BoxGeometry();
        const cubeMaterial = new THREE.MeshBasicMaterial({ color: Math.random() * 0xffffff });
        const cube = new THREE.Mesh(cubeGeometry, cubeMaterial);
        const cameraDirection = new THREE.Vector3();
        camera.getWorldDirection(cameraDirection);
        cube.position.set(
            camera.position.x + cameraDirection.x * 10,
            camera.position.y + cameraDirection.y * 10,
            camera.position.z + cameraDirection.z * 10
        );
        scene.add(cube);
        return cube;
    }

    const key = {};
    var baseSpeed = 0.02;
    var freeCameraMode = true;

    document.addEventListener('keydown', (event) => {
        key[event.code] = true;
        if (event.code === 'KeyH') {
            freeCameraMode = !freeCameraMode;
        }
    });

    document.addEventListener('keyup', (event) => {
        key[event.code] = false;
    });

    function moveCamera(deltaTime) {
        const forwardDirection = new THREE.Vector3();
        const rightDirection = new THREE.Vector3();
        const upDirection = new THREE.Vector3(0, 1, 0);
        camera.getWorldDirection(forwardDirection);
        forwardDirection.normalize();
        rightDirection.setFromMatrixColumn(camera.matrixWorld, 0);
        rightDirection.normalize();
        let moveDirection = new THREE.Vector3(0, 0, 0);
        if (!freeCameraMode) {
            forwardDirection.y = 0;
            forwardDirection.normalize();
            rightDirection.y = 0;
            rightDirection.normalize();
        }
        let currentSpeed = baseSpeed * deltaTime;
        if (key['ShiftLeft'] || key['ShiftRight']) {
            currentSpeed *= 2;
        }
        if (key['KeyW']) moveDirection.add(forwardDirection);
        if (key['KeyS']) moveDirection.sub(forwardDirection);
        if (key['KeyA']) moveDirection.sub(rightDirection);
        if (key['KeyD']) moveDirection.add(rightDirection);
        if (key['Space']) moveDirection.add(upDirection);
        if (key['ControlLeft'] || key['ControlRight']) moveDirection.sub(upDirection);
        if (moveDirection.lengthSq() > 0) {
            moveDirection.normalize();
        }
        camera.position.addScaledVector(moveDirection, currentSpeed);
    }

    let isPointerLocked = false;

    document.addEventListener('click', (event) => {
        if (!isPointerLocked && event.target === renderer.domElement) {
            renderer.domElement.requestPointerLock();
        }
    });

    document.addEventListener('pointerlockchange', () => {
        isPointerLocked = document.pointerLockElement === renderer.domElement;
        document.body.classList.toggle('hidden-cursor', isPointerLocked);
    });

    document.addEventListener('mousemove', (event) => {
        if (isPointerLocked) {
            euler.setFromQuaternion(camera.quaternion);
            euler.y -= event.movementX * 0.002;
            euler.x -= event.movementY * 0.002;
            euler.x = Math.max(-Math.PI / 2, Math.min(Math.PI / 2, euler.x));
            camera.quaternion.setFromEuler(euler);
        }
    });

    function newUI() {
        const id = elementCounter++;
        uiElements.set(id, null);
        return id;
    }

    function setTxtField(id, text = undefined, x = 0, y = 0, color = undefined) {
        let element = uiElements.get(id);
        if (!element) {
            element = document.createElement('input');
            element.type = 'text';
            element.style.fontSize = '20px';
            element.style.pointerEvents = 'auto';
            element.style.position = 'absolute';
            document.body.appendChild(element);
            uiElements.set(id, element);
        }
        if (text !== undefined) element.value = text;
        if (color !== undefined) element.style.color = color;
        element.style.left = `${x}px`;
        element.style.top = `${y}px`;
    }

    function setSquare(id, x, y, width, height, color, follow = undefined) {
        let element = uiElements.get(id);
        if (!element) {
            element = document.createElement('div');
            element.className = 'square';
            element.style.position = 'absolute';
            document.body.appendChild(element);
            uiElements.set(id, element);
        }
        element.style.width = `${width}px`;
        element.style.height = `${height}px`;
        element.style.backgroundColor = color;
        if (follow !== undefined) {
            const squareLabel = new THREE.CSS2DObject(element);
            squareLabel.position.set(x, y, 0);
            follow.add(squareLabel);
            uiElements.set(id, squareLabel);
        } else {
            element.style.left = `${x}px`;
            element.style.top = `${y}px`;
        }
    }

    function setCheckbox(id, checked, x = 0, y = 0) {
        let element = uiElements.get(id);
        if (!element) {
            element = document.createElement('input');
            element.type = 'checkbox';
            element.style.pointerEvents = 'auto';
            element.style.position = 'absolute';
            document.body.appendChild(element);
            uiElements.set(id, element);
        }
        element.checked = checked;
        element.style.left = `${x}px`;
        element.style.top = `${y}px`;
    }

    function setButton(id, text, x = 0, y = 0, color = undefined, onClickFunction = null) {
        let element = uiElements.get(id);
        if (!element) {
            element = document.createElement('button');
            element.style.pointerEvents = 'auto';
            element.style.position = 'absolute';
            document.body.appendChild(element);
            uiElements.set(id, element);
        }
        element.textContent = text;
        if (color !== undefined) element.style.color = color;
        element.style.left = `${x}px`;
        element.style.top = `${y}px`;
        if (onClickFunction) {
            element.onclick = onClickFunction;
        }
    }

    function setSlider(id, value, x = 0, y = 0) {
        let element = uiElements.get(id);
        if (!element) {
            element = document.createElement('input');
            element.type = 'range';
            element.style.pointerEvents = 'auto';
            element.style.position = 'absolute';
            document.body.appendChild(element);
            uiElements.set(id, element);
        }
        element.value = value;
        element.style.left = `${x}px`;
        element.style.top = `${y}px`;
    }

    function setText(id, text, x = 0, y = 0, z = 0, color = undefined, follow = undefined) {
        let element = uiElements.get(id);
        if (!element) {
            element = document.createElement('div');
            element.style.color = 'rgba(255, 255, 255, 1)';
            element.style.fontSize = '20px';
            element.style.pointerEvents = 'none';
            element.classList.add('overlay-text');
            document.body.appendChild(element);
            uiElements.set(id, element);
        }
        element.textContent = text;
        if (color !== undefined) element.style.color = color;
        if (follow !== undefined) {
            const textLabel = new THREE.CSS2DObject(element);
            textLabel.position.set(x, y, z);
            follow.add(textLabel);
            uiElements.set(id, textLabel);
        } else {
            element.style.position = 'absolute';
            element.style.left = `${x}px`;
            element.style.top = `${y}px`;
        }
    }

    function removeElement(id, time = 0) {
        const element = uiElements.get(id);
        if (element) {
            if (time > 0) {
                setTimeout(() => {
                    if (element instanceof THREE.CSS2DObject) {
                        element.parent.remove(element);
                    } else {
                        document.body.removeChild(element);
                    }
                    uiElements.delete(id);
                }, time);
            } else {
                if (element instanceof THREE.CSS2DObject) {
                    element.parent.remove(element);
                } else {
                    document.body.removeChild(element);
                }
                uiElements.delete(id);
            }
        }
    }

    function makeElementDraggable(element) {
        let offsetX, offsetY;

        function onMouseDown(e) {
            offsetX = e.clientX - element.getBoundingClientRect().left;
            offsetY = e.clientY - element.getBoundingClientRect().top;
            element.style.cursor = 'grabbing';

            document.addEventListener('mousemove', onMouseMove);
            document.addEventListener('mouseup', onMouseUp);
        }

        function onMouseMove(e) {
            element.style.left = `${e.clientX - offsetX}px`;
            element.style.top = `${e.clientY - offsetY}px`;
        }

        function onMouseUp() {
            document.removeEventListener('mousemove', onMouseMove);
            document.removeEventListener('mouseup', onMouseUp);
            element.style.cursor = 'grab';
        }

        element.addEventListener('mousedown', onMouseDown);

        return {
            enable() {
                element.style.cursor = 'grab';
            },
            disable() {
                element.style.cursor = 'default';
            }
        };
    }

    function syncSliderAndTextField(sliderId, textFieldId) {
        const slider = uiElements.get(sliderId);
        const textField = uiElements.get(textFieldId);

        if (slider && textField) {
            slider.addEventListener('input', () => {
                textField.value = slider.value;
            });

            textField.addEventListener('input', () => {
                slider.value = textField.value;
            });
        }
    }

    let lastTime = performance.now();

    window.addEventListener('resize', () => {
        camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();
        renderer.setSize(window.innerWidth, window.innerHeight);
    });

    window.onbeforeunload = function (e) {
        e.preventDefault();
        e.returnValue = 'Really want to quit the game?';
    };

    document.onkeydown = function (e) {
        e = e || window.event; // Get event

        if (e.keyCode === 123) { // F12 devtools
            e.preventDefault();
            e.stopPropagation();
        }
        if (e.keyCode === 9 && e.ctrlKey) { // Ctrl+Tab
            e.preventDefault();
            e.stopPropagation();
        }
        if (e.which || e.keyCode === 116) { // F5
            e.preventDefault();
            e.stopPropagation();
        }
        if (!(e.ctrlKey || e.metaKey)) return;
        var code = e.which || e.keyCode;
        switch (code) {
            case 83: // Ctrl+S
            case 87: // Ctrl+W
            case 82: // Ctrl+R
            case 84: // Ctrl+T
            case 78: // Ctrl+N
                e.preventDefault();
                e.stopPropagation();
                break;
        }
    };

    function animate(time) {
        requestAnimationFrame(animate);
        const deltaTime = (time - lastTime);

        moveCamera(deltaTime);
        renderer.render(scene, camera);
        labelRenderer.render(scene, camera);
        lastTime = time;
    }

    requestAnimationFrame(animate);

    function onWindowResize() {
        camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();
        renderer.setSize(window.innerWidth, window.innerHeight);
    }

    window.addEventListener('resize', onWindowResize);

    // Expose functions to the global scope
    window.MyLibrary = {
        camera,
        createCube,
        newUI,
        setTxtField,
        setSquare,
        setCheckbox,
        setButton,
        setSlider,
        setText,
        removeElement,
        makeElementDraggable,
        syncSliderAndTextField
    };
})();