threejs_r132.使用Raycaster获取鼠标点击物体示例

web/JavaScript threejs_r132.使用Raycaster获取鼠标点击物体示例

<button id="button">全屏</button>
<br/>
<div style="width:800px; height:350px;">
    <canvas id="canvas" style="position:absolute; border:1px solid #3399ff;"></canvas>
</div>
<script>
    let original_width = 800;
    let original_height = 350;

    let canvas = document.getElementById("canvas");

    let button = document.getElementById("button");
    button.onclick = function () {
        CanvasResizeManager.addFullScreenListener();
    };

    let head = document.getElementsByTagName("head")[0];

    let cannon_script = document.createElement("script");
    cannon_script.src = "https://github.com/schteppe/cannon.js/releases/download/v0.6.2/cannon.min.js";
    head.appendChild(cannon_script);

    let three_script = document.createElement("script");
    three_script.src = "https://github.com/mrdoob/three.js/blob/dev/build/three_r132_min.js";
    head.appendChild(three_script);

    cannon_script.onload = function () {
        three_script.onload = function () {
            new Cinema().render();
        };
    };

    class Cinema {
        constructor() {
            canvas.width = original_width;
            canvas.height = original_height;

            this.cannonWorld = new CANNON.World();
            this.cannonWorld.gravity.set(0, -9, 0);
            this.cannonWorld.solver.iterations = 5;
            this.cannonWorld.broadphase = new CANNON.NaiveBroadphase();

            this.pickPosition = {x: -100000, y: -100000}; // 鼠标的实时位置

            let ambientLight = LightFactory.getAmbientLight("#90d7ec");
            let directionalLight = LightFactory.getDirectionalLight("#ffffff");

            let aspect = canvas.width / canvas.height;
            this.camera = new THREE.PerspectiveCamera(60, aspect, 0.5, 1000);
            this.camera.position.x = 50;
            this.camera.position.y = 60;
            this.camera.position.z = 70;
            this.camera.lookAt(0, 5, 0);

            let _controls = new THREE.OrbitControls(this.camera, canvas);

            this.scene = new THREE.Scene();
            this.scene.background = new THREE.Color('#393939');
            this.scene.add(this.camera);
            this.scene.add(ambientLight);
            this.scene.add(directionalLight);

            this.renderer = new THREE.WebGLRenderer({canvas: canvas, antialias: true});
            this.renderer.shadowMap.enabled = true;
            this.renderer.shadowMap.type = THREE.PCFSoftShadowMap;
            this.renderer.setSize(canvas.width, canvas.height);

            this.pickHelper = new PickHelper(this.cannonWorld, this.scene, this.camera);

            canvas.addEventListener('click', this.clickCallback.bind(this));   // 鼠标点击
            document.addEventListener('mousewheel', this.resetCallback.bind(this));
            document.addEventListener('mousemove', this.resetCallback.bind(this));
            window.addEventListener("resize", this.onCanvasResize.bind(this));

            let bound = 500;
            let ground = new CannonGround(this.scene, this.cannonWorld);
            ground.intoSceneAndWorld(bound, bound);

            this.intervalTime = 1000;
            setInterval(() => {
                let cannonBox = new CannonBox(this.scene, this.cannonWorld);
                cannonBox.intoSceneAndWorld(bound);
            }, this.intervalTime);
        }

        resetCallback(event) {
            this.pickPosition = {x: -100000, y: -100000};
        }

        clickCallback(event) {
            let rect = canvas.getBoundingClientRect();
            let pos = {
                x: (event.clientX - rect.left) * canvas.width / rect.width,
                y: (event.clientY - rect.top) * canvas.height / rect.height,
            };
            this.pickPosition.x = (pos.x / canvas.width) * 2 - 1;
            this.pickPosition.y = (pos.y / canvas.height) * -2 + 1;  // note we flip Y
            this.pickHelper.pick(this.pickPosition);
            this.resetCallback();
        }

        onCanvasResize() { // 浏览器全屏与退出响应
            let fullscreenEnabled = CanvasResizeManager.isFullscreenEnabled();
            if (fullscreenEnabled) {
                let fullscreen = CanvasResizeManager.isFullscreen();
                if (fullscreen) {
                    canvas.width = window.innerWidth;
                    canvas.height = window.innerHeight;
                } else {
                    canvas.width = original_width;
                    canvas.height = original_height;
                }

                this.resizeRendererToDisplaySize();
            }
        }

        resizeRendererToDisplaySize() {
            this.camera.aspect = canvas.width / canvas.height;
            this.camera.updateProjectionMatrix();
            this.renderer.setSize(canvas.width, canvas.height, false);
        }

        updatePhysics() {
            this.cannonWorld.step(0.2);          // 降落速度
            this.scene.children.forEach(obj => { // 遍历场景中的对象
                if (obj.isMesh == true) {
                    obj.position.copy(obj.userData.position);
                    obj.quaternion.copy(obj.userData.quaternion);
                }
            });
        }

        render() {
            this.updatePhysics();
            this.renderer.render(this.scene, this.camera);
            requestAnimationFrame(this.render.bind(this));
        }
    }

    class CanvasResizeManager {
        static addFullScreenListener() {
            let fullscreenEnabled = CanvasResizeManager.isFullscreenEnabled();
            if (fullscreenEnabled) {
                let fullscreen = CanvasResizeManager.isFullscreen();
                if (!fullscreen) {
                    if (canvas.requestFullscreen) {
                        canvas.requestFullscreen();
                    } else if (canvas.msRequestFullscreen) {
                        canvas.msRequestFullscreen();
                    } else if (canvas.mozRequestFullScreen) {
                        canvas.mozRequestFullScreen();
                    } else if (canvas.webkitRequestFullscreen) {
                        canvas.webkitRequestFullscreen();
                    }
                }
            }
        }

        static exitScreen() {  // 手动退出全屏
            if (document.exitFullscreen) {
                document.exitFullscreen();
            } else if (document.mozCancelFullScreen) {
                document.mozCancelFullScreen();
            } else if (document.webkitCancelFullScreen) {
                document.webkitCancelFullScreen();
            } else if (document.msExitFullscreen) {
                document.msExitFullscreen();
            }
        }

        static isFullscreenEnabled() {  // 浏览器是否支持全屏
            return document.fullscreenEnabled
                || document.mozFullScreenEnabled
                || document.webkitFullscreenEnabled
                || document.msFullscreenEnabled || false;
        }

        static isFullscreen() {  // 判断是否全屏状态
            return Boolean(document.fullscreenElement
                || document.msFullscreenElement
                || document.mozFullScreenElement
                || document.webkitFullscreenElement || false);
        }
    }

    class PickHelper {
        constructor(cannonWorld, scene, camera) {
            this.raycaster = new THREE.Raycaster();
            this.cannonWorld = cannonWorld;
            this.scene = scene;
            this.camera = camera;
            this.count = 0;

            this.textSprite = new TextLegendSprite(0);
            this.camera.add(this.textSprite);
        }

        pick(pickedPosition) {
            this.raycaster.setFromCamera(pickedPosition, this.camera);
            let objs = this.raycaster.intersectObjects(this.scene.children);
            if (objs.length > 0) {
                let obj = objs[0].object;
                if (null !== obj) {
                    if (typeof(obj) !== "undefined") {
                        if ("ground" !== obj.name) {
                            this.cannonWorld.removeBody(obj.userData);
                            this.scene.remove(obj);  // 删除物体
                            this.count++;

                            this.camera.remove(this.textSprite);
                            this.textSprite = new TextLegendSprite(this.count);
                            this.camera.add(this.textSprite);
                        }
                    }
                }
            }
        }
    }

    class LightFactory {
        static getDirectionalLight(color, x = 80, y = 200, z = -150) {
            let light = new THREE.DirectionalLight(color, 1);
            light.position.set(x, y, z);
            light.target.position.set(300, 5, 150);
            light.castShadow = true;
            light.shadow.camera.visible = true;
            let d = 250;
            light.shadow.camera.left = -d;
            light.shadow.camera.right = d;
            light.shadow.camera.top = d;
            light.shadow.camera.bottom = -d;
            light.shadow.camera.far = 500;
            light.shadow.bias = -0.01;
            light.shadow.mapSize.height = 2048;
            light.shadow.mapSize.width = 2048;

            return light;
        }

        static getAmbientLight(color) {
            let light = new THREE.AmbientLight();
            light.color.set(color);

            return light;
        }
    }

    class CannonGround {
        constructor(scene, cannonWorld) {
            this.scene = scene;
            this.cannonWorld = cannonWorld;
        }

        intoSceneAndWorld(width, depth) {
            let height = 0.05;
            let x = 0;
            let y = 0.05;
            let z = 0;

            let shape = new CANNON.Box(new CANNON.Vec3(width / 2, height / 2, depth / 2)); // 
            let cannonBody = new CANNON.Body({
                mass: 0,
                position: new CANNON.Vec3(x, y, z),
                shape: shape,
                material: new CANNON.Material({
                    friction: 0.5,
                    restitution: 0.5,
                })
            });
            this.cannonWorld.addBody(cannonBody);

            let color = "#cececf";
            let geometry = new THREE.BoxGeometry(width, height, depth);
            let material = new THREE.MeshPhongMaterial({
                color: color,
                shininess: 5,
            });
            let mesh = new THREE.Mesh(geometry, material);
            mesh.name = "ground";
            mesh.position.x = x;
            mesh.position.y = y;
            mesh.position.z = z;
            mesh.castShdow = true;
            mesh.receiveShadow = true;
            mesh.userData = cannonBody;

            this.scene.add(mesh);

            let grid = new THREE.GridHelper(width, depth / 10, "#993333", "#993333");
            grid.name = "ground";
            grid.material.opacity = 0.2;
            grid.material.transparent = true;
            grid.position.x = x;
            grid.position.y = y * 2; // y是负数就除以，是正数就乘以
            grid.position.z = z;

            this.scene.add(grid);
        }
    }

    class CannonBox {
        constructor(scene, cannonWorld) {
            this.scene = scene;
            this.cannonWorld = cannonWorld;
        }

        intoSceneAndWorld(bound) {
            let width = 10;
            let depth = 10;
            let height = 10;
            let x = (0.5 - Math.random()) * bound / 5;
            let y = 100;
            let z = (0.5 - Math.random()) * bound / 5;

            let cannonBody = new CANNON.Body({
                mass: 1,
                position: new CANNON.Vec3(x, y, z),
                shape: new CANNON.Box(new CANNON.Vec3(width / 2, height / 2, depth / 2)), // 
                material: new CANNON.Material({
                    friction: 0.4,
                    restitution: 1.2
                })
            });
            this.cannonWorld.addBody(cannonBody);

            var color = "#";
            for (let k = 0; k < 6; k++) color += parseInt(Math.random() * 16).toString(16);
            let material = new THREE.MeshPhongMaterial({
                color: color,
                side: THREE.DoubleSide,
            });
            let geometry = new THREE.BoxGeometry(width, height, depth);
            let mesh = new THREE.Mesh(geometry, material);
            mesh.name = new Date().getTime() + "";
            mesh.position.set(x, y, z);
            mesh.castShadow = true;
            mesh.receiveShadow = true;
            mesh.userData = cannonBody;
            this.scene.add(mesh);

            setTimeout(() => {
                this.cannonWorld.removeBody(cannonBody);
                this.scene.remove(mesh);
                mesh.material.dispose();
                mesh.geometry.dispose();
            }, 8000);
        }
    }

    class TextLegendSprite {
        constructor(text) {
            let canvas = document.createElement("canvas");
            canvas.width = 64;
            canvas.height = 64;
            let paint = canvas.getContext("2d");

            paint.fillStyle = "#f03B30";
            paint.font = 28 + "px bold";
            paint.fillText(text + "", 10, 35);

            let spriteMaterial = new THREE.SpriteMaterial({
                map: new THREE.CanvasTexture(canvas),
                transparent: true,
            });

            let _sprite = new THREE.Sprite(spriteMaterial);
            _sprite.position.set(-1.2, 0.6, -1.4);
            _sprite.scale.set(0.2, 0.2, 1);

            return _sprite;
        }
    }
</script>

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<br/>

</div>

let original_width = 800;

let original_height = 350;

let canvas = document.getElementById("canvas");

let button = document.getElementById("button");

button.onclick = function () {

CanvasResizeManager.addFullScreenListener();

};

let head = document.getElementsByTagName("head")[0];

let cannon_script = document.createElement("script");

cannon_script.src = "https://github.com/schteppe/cannon.js/releases/download/v0.6.2/cannon.min.js";

head.appendChild(cannon_script);

let three_script = document.createElement("script");

three_script.src = "https://github.com/mrdoob/three.js/blob/dev/build/three_r132_min.js";

head.appendChild(three_script);

cannon_script.onload = function () {

three_script.onload = function () {

new Cinema().render();

};

class Cinema {

constructor() {

canvas.width = original_width;

canvas.height = original_height;

this.cannonWorld = new CANNON.World();

this.cannonWorld.gravity.set(0, -9, 0);

this.cannonWorld.solver.iterations = 5;

this.cannonWorld.broadphase = new CANNON.NaiveBroadphase();

this.pickPosition = {x: -100000, y: -100000}; // 鼠标的实时位置

let ambientLight = LightFactory.getAmbientLight("#90d7ec");

let directionalLight = LightFactory.getDirectionalLight("#ffffff");

let aspect = canvas.width / canvas.height;

this.camera = new THREE.PerspectiveCamera(60, aspect, 0.5, 1000);

this.camera.position.x = 50;

this.camera.position.y = 60;

this.camera.position.z = 70;

this.camera.lookAt(0, 5, 0);

let _controls = new THREE.OrbitControls(this.camera, canvas);

this.scene = new THREE.Scene();

this.scene.background = new THREE.Color('#393939');

this.scene.add(this.camera);

this.scene.add(ambientLight);

this.scene.add(directionalLight);

this.renderer = new THREE.WebGLRenderer({canvas: canvas, antialias: true});

this.renderer.shadowMap.enabled = true;

this.renderer.shadowMap.type = THREE.PCFSoftShadowMap;

this.renderer.setSize(canvas.width, canvas.height);

this.pickHelper = new PickHelper(this.cannonWorld, this.scene, this.camera);

canvas.addEventListener('click', this.clickCallback.bind(this)); // 鼠标点击

document.addEventListener('mousewheel', this.resetCallback.bind(this));

document.addEventListener('mousemove', this.resetCallback.bind(this));

window.addEventListener("resize", this.onCanvasResize.bind(this));

let bound = 500;

let ground = new CannonGround(this.scene, this.cannonWorld);

ground.intoSceneAndWorld(bound, bound);

this.intervalTime = 1000;

setInterval(() => {

let cannonBox = new CannonBox(this.scene, this.cannonWorld);

cannonBox.intoSceneAndWorld(bound);

}, this.intervalTime);

}

resetCallback(event) {

this.pickPosition = {x: -100000, y: -100000};

}

clickCallback(event) {

let rect = canvas.getBoundingClientRect();

let pos = {

x: (event.clientX - rect.left) * canvas.width / rect.width,

y: (event.clientY - rect.top) * canvas.height / rect.height,

};

this.pickPosition.x = (pos.x / canvas.width) * 2 - 1;

this.pickPosition.y = (pos.y / canvas.height) * -2 + 1; // note we flip Y

this.pickHelper.pick(this.pickPosition);

this.resetCallback();

}

onCanvasResize() { // 浏览器全屏与退出响应

let fullscreenEnabled = CanvasResizeManager.isFullscreenEnabled();

if (fullscreenEnabled) {

let fullscreen = CanvasResizeManager.isFullscreen();

if (fullscreen) {

canvas.width = window.innerWidth;

canvas.height = window.innerHeight;

} else {

canvas.width = original_width;

canvas.height = original_height;

}

this.resizeRendererToDisplaySize();

}

resizeRendererToDisplaySize() {

this.camera.aspect = canvas.width / canvas.height;

this.camera.updateProjectionMatrix();

this.renderer.setSize(canvas.width, canvas.height, false);

}

updatePhysics() {

this.cannonWorld.step(0.2); // 降落速度

this.scene.children.forEach(obj => { // 遍历场景中的对象

if (obj.isMesh == true) {

obj.position.copy(obj.userData.position);

obj.quaternion.copy(obj.userData.quaternion);

}

});

}

render() {

this.updatePhysics();

this.renderer.render(this.scene, this.camera);

requestAnimationFrame(this.render.bind(this));

}

class CanvasResizeManager {

static addFullScreenListener() {

let fullscreenEnabled = CanvasResizeManager.isFullscreenEnabled();

if (fullscreenEnabled) {

let fullscreen = CanvasResizeManager.isFullscreen();

if (!fullscreen) {

if (canvas.requestFullscreen) {

canvas.requestFullscreen();

} else if (canvas.msRequestFullscreen) {

canvas.msRequestFullscreen();

} else if (canvas.mozRequestFullScreen) {

canvas.mozRequestFullScreen();

} else if (canvas.webkitRequestFullscreen) {

canvas.webkitRequestFullscreen();

}

static exitScreen() { // 手动退出全屏

if (document.exitFullscreen) {

document.exitFullscreen();

} else if (document.mozCancelFullScreen) {

document.mozCancelFullScreen();

} else if (document.webkitCancelFullScreen) {

document.webkitCancelFullScreen();

} else if (document.msExitFullscreen) {

document.msExitFullscreen();

}

static isFullscreenEnabled() { // 浏览器是否支持全屏

return document.fullscreenEnabled

|| document.mozFullScreenEnabled

|| document.webkitFullscreenEnabled

|| document.msFullscreenEnabled || false;

}

static isFullscreen() { // 判断是否全屏状态

return Boolean(document.fullscreenElement

|| document.msFullscreenElement

|| document.mozFullScreenElement

|| document.webkitFullscreenElement || false);

}

class PickHelper {

constructor(cannonWorld, scene, camera) {

this.raycaster = new THREE.Raycaster();

this.cannonWorld = cannonWorld;

this.scene = scene;

this.camera = camera;

this.count = 0;

this.textSprite = new TextLegendSprite(0);

this.camera.add(this.textSprite);

}

pick(pickedPosition) {

this.raycaster.setFromCamera(pickedPosition, this.camera);

let objs = this.raycaster.intersectObjects(this.scene.children);

if (objs.length > 0) {

let obj = objs[0].object;

if (null !== obj) {

if (typeof(obj) !== "undefined") {

if ("ground" !== obj.name) {

this.cannonWorld.removeBody(obj.userData);

this.scene.remove(obj); // 删除物体

this.count++;

this.camera.remove(this.textSprite);

this.textSprite = new TextLegendSprite(this.count);

this.camera.add(this.textSprite);

}

class LightFactory {

static getDirectionalLight(color, x = 80, y = 200, z = -150) {

let light = new THREE.DirectionalLight(color, 1);

light.position.set(x, y, z);

light.target.position.set(300, 5, 150);

light.castShadow = true;

light.shadow.camera.visible = true;

let d = 250;

light.shadow.camera.left = -d;

light.shadow.camera.right = d;

light.shadow.camera.top = d;

light.shadow.camera.bottom = -d;

light.shadow.camera.far = 500;

light.shadow.bias = -0.01;

light.shadow.mapSize.height = 2048;

light.shadow.mapSize.width = 2048;

return light;

}

static getAmbientLight(color) {

let light = new THREE.AmbientLight();

light.color.set(color);

return light;

}

class CannonGround {

constructor(scene, cannonWorld) {

this.scene = scene;

this.cannonWorld = cannonWorld;

}

intoSceneAndWorld(width, depth) {

let height = 0.05;

let x = 0;

let y = 0.05;

let z = 0;

let shape = new CANNON.Box(new CANNON.Vec3(width / 2, height / 2, depth / 2)); //

let cannonBody = new CANNON.Body({

mass: 0,

position: new CANNON.Vec3(x, y, z),

shape: shape,

material: new CANNON.Material({

friction: 0.5,

restitution: 0.5,

})

});

this.cannonWorld.addBody(cannonBody);

let color = "#cececf";

let geometry = new THREE.BoxGeometry(width, height, depth);

let material = new THREE.MeshPhongMaterial({

color: color,

shininess: 5,

});

let mesh = new THREE.Mesh(geometry, material);

mesh.name = "ground";

mesh.position.x = x;

mesh.position.y = y;

mesh.position.z = z;

mesh.castShdow = true;

mesh.receiveShadow = true;

mesh.userData = cannonBody;

this.scene.add(mesh);

let grid = new THREE.GridHelper(width, depth / 10, "#993333", "#993333");

grid.name = "ground";

grid.material.opacity = 0.2;

grid.material.transparent = true;

grid.position.x = x;

grid.position.y = y * 2; // y是负数就除以，是正数就乘以

grid.position.z = z;

this.scene.add(grid);

}

class CannonBox {

constructor(scene, cannonWorld) {

this.scene = scene;

this.cannonWorld = cannonWorld;

}

intoSceneAndWorld(bound) {

let width = 10;

let depth = 10;

let height = 10;

let x = (0.5 - Math.random()) * bound / 5;

let y = 100;

let z = (0.5 - Math.random()) * bound / 5;

let cannonBody = new CANNON.Body({

mass: 1,

position: new CANNON.Vec3(x, y, z),

shape: new CANNON.Box(new CANNON.Vec3(width / 2, height / 2, depth / 2)), //

material: new CANNON.Material({

friction: 0.4,

restitution: 1.2

})

});

this.cannonWorld.addBody(cannonBody);

var color = "#";

for (let k = 0; k < 6; k++) color += parseInt(Math.random() * 16).toString(16);

let material = new THREE.MeshPhongMaterial({

color: color,

side: THREE.DoubleSide,

});

let geometry = new THREE.BoxGeometry(width, height, depth);

let mesh = new THREE.Mesh(geometry, material);

mesh.name = new Date().getTime() + "";

mesh.position.set(x, y, z);

mesh.castShadow = true;

mesh.receiveShadow = true;

mesh.userData = cannonBody;

this.scene.add(mesh);

setTimeout(() => {

this.cannonWorld.removeBody(cannonBody);

this.scene.remove(mesh);

mesh.material.dispose();

mesh.geometry.dispose();

}, 8000);

}

class TextLegendSprite {

constructor(text) {

let canvas = document.createElement("canvas");

canvas.width = 64;

canvas.height = 64;

let paint = canvas.getContext("2d");

paint.fillStyle = "#f03B30";

paint.font = 28 + "px bold";

paint.fillText(text + "", 10, 35);

let spriteMaterial = new THREE.SpriteMaterial({

map: new THREE.CanvasTexture(canvas),

transparent: true,

});

let _sprite = new THREE.Sprite(spriteMaterial);

_sprite.position.set(-1.2, 0.6, -1.4);

_sprite.scale.set(0.2, 0.2, 1);

return _sprite;

}

</script>

- end

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