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本文介绍: 使用three.js实现soul的星图效果

使用three.js实现soul的星图效果

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8"&gt;
  <title&gt;给英杰写的soul的星图基于three.js</title&gt;
  <style&gt;
    body {
      margin: 0;
      overflow: hidden;
      /* 隐藏body窗口区域滚动条 */
    }
  </style&gt;
  <script src="https://cdn.bootcdn.net/ajax/libs/three.js/100/three.js"></script>
  <script src="./js/index.js"></script>
</head>

<body>
  <script>
    /**
     * 创建场景对象Scene
     */
    var scene = new THREE.Scene();


    /**
     * 光源设置
     */
    //点光源
    var point = new THREE.PointLight(0xffffff);
    point.position.set(400, 200, 300); //点光源位置
    //scene.add(point); //点光源添加到场景中
    //环境光
    var ambient = new THREE.AmbientLight(0x444444);
    scene.add(ambient);

    /**
     * 相机设置
     */
    var width = window.innerWidth; //窗口宽度
    var height = window.innerHeight; //窗口高度

    camera = new THREE.PerspectiveCamera(40, window.innerWidth / window.innerHeight, 1, 10000);

    camera.position.set(0, 0, 3000);
    function createS (_text) {
      // 将文字放在画布中间
      function makeTextCanvas (text, width, height) {
        var canvas = document.createElement("canvas");
        canvas.width = width;
        canvas.height = height;
        var c = canvas.getContext("2d");

        // c.fillStyle = "#FF0000";
        // c.fillRect(0, 0, width, height);
        c.clearRect(0, 0, c.canvas.width, c.canvas.height);

        // 文字
        c.beginPath();
        c.translate(width / 2, height / 2);
        c.fillStyle = "#ffffff"; //文本填充颜色
        c.font = "48px Arial"; //字体样式设置
        c.textBaseline = "middle"; //文本与fillText定义的纵坐标
        c.textAlign = "center"; //文本居中(以fillText定义的横坐标)
        c.fillText(text, 0, 0);
        // document.body.appendChild(canvas)
        return c.canvas;
      }
      var textCanvas = makeTextCanvas(_text, 160, 80);


      var texture = new THREE.CanvasTexture(textCanvas);
      texture.generateMipmaps = false;
      texture.minFilter = THREE.LinearFilter;
      texture.magFilter = THREE.LinearFilter;

      let pinMaterial = new THREE.SpriteMaterial({
        map: texture,

      });
      let mesh = new THREE.Sprite(pinMaterial);

      return mesh

    }

    let group = new THREE.Group();
    //var sphere = []
    //var vector = new THREE.Vector3();

    const texts = ['小尹', '小范', '小轩', '小英杰', '哈哈', '嘿嘿', '奥里给'];

    for (var i = 0, l = 60; i < l; i++) {

      var phi = Math.acos(- 1 + (2 * i) / l);
      var theta = Math.sqrt(l * Math.PI) * phi;

      var sprite = createS(texts[Math.floor(i / 10)])
      sprite.scale.set(80, 40, 1);
      sprite.position.setFromSphericalCoords(800, phi, theta)


      //sphere.push(sprite)
      group.add(sprite);

    }

    scene.add(group);

    /**
     * 创建渲染器对象
     */
    var renderer = new THREE.WebGLRenderer({
      antialias: true
    });
    renderer.setSize(width, height);//设置渲染区域尺寸
    renderer.shadowMap.enabled = false;
    //renderer.setClearColor(0xb9d3ff, 1); //设置背景颜色
    renderer.setPixelRatio(window.devicePixelRatio);
    document.body.appendChild(renderer.domElement); //body元素中插入canvas对象
    //执行渲染操作   指定场景、相机作为参数
    renderer.render(scene, camera);
    var controls = new THREE.OrbitControls(camera, renderer.domElement);
    function render () {
      renderer.render(scene, camera);//执行渲染操作
      group.rotateY(-0.001);//每次绕y轴旋转0.01弧度
      group.rotateX(0.001)
      controls.update()

      requestAnimationFrame(render);//请求再次执行渲染函数render
    }
    render();

  </script>
</body>

</html>

/**
 * @name soul的星图
 * @Time 2023/03/20
 * @description 
 **/
THREE.OrbitControls = function (object, domElement) {
	this.object = object;
	this.domElement = ( domElement !== undefined ) ? domElement : document;
	// API
	// 设置为false以禁用此控件
	this.enabled = true;
	// "target"设置焦点位置，即控件围绕的位置
  //和它相对于平移的位置。
	this.target = new THREE.Vector3();
	// center是旧的，已弃用;用“target”代替
	this.center = this.target;
	//该选项实际启用了缩放;左为“缩放”
  //向后兼容
	this.noZoom = false;
	this.zoomSpeed = 1.0;
	//限制你可以移动的距离(仅限透视相机)
	this.minDistance = 0;
	this.maxDistance = Infinity;
  //限制你可以放大和缩小的距离(仅适用于OrthographicCamera)
	this.minZoom = 0;
	this.maxZoom = Infinity;
	//设置为true禁用该控件
	this.noRotate = false;
	this.rotateSpeed = 1.0;
	//设置为true禁用该控件
	this.noPan = false;
	this.keyPanSpeed = 7.0;	//每次按方向键移动像素
	//设置为true自动围绕目标旋转
	this.autoRotate = false;
	this.autoRotateSpeed = 2.0; //当FPS为60时，每回合30秒
	//你可以垂直绕轨道运行多远，上下限。
  //从0到Math。π弧度。
	this.minPolarAngle = 0; // 弧度
	this.maxPolarAngle = Math.PI; // 弧度
  //你的水平轨道距离，上限和下限。
  //如果设置了，则必须是interval [- Math. interval]的子interval。π,数学。π)。
	this.minAzimuthAngle = - Infinity; // 弧度
	this.maxAzimuthAngle = Infinity; // 弧度
	//设置为true禁用键的使用
	this.noKeys = false;
	//四个方向键
	this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };
	//鼠标按钮
	this.mouseButtons = { ORBIT: THREE.MOUSE.LEFT, ZOOM: THREE.MOUSE.MIDDLE, PAN: THREE.MOUSE.RIGHT };
	//内部
	var scope = this;
  var EPS = 0.000001;
  
	var rotateStart = new THREE.Vector2();
	var rotateEnd = new THREE.Vector2();
	var rotateDelta = new THREE.Vector2();

	var panStart = new THREE.Vector2();
	var panEnd = new THREE.Vector2();
	var panDelta = new THREE.Vector2();
	var panOffset = new THREE.Vector3();

	var offset = new THREE.Vector3();

	var dollyStart = new THREE.Vector2();
	var dollyEnd = new THREE.Vector2();
	var dollyDelta = new THREE.Vector2();

	var theta;
	var phi;
	var phiDelta = 0;
	var thetaDelta = 0;
	var scale = 1;
	var pan = new THREE.Vector3();

	var lastPosition = new THREE.Vector3();
	var lastQuaternion = new THREE.Quaternion();

	var STATE = { NONE : -1, ROTATE : 0, DOLLY : 1, PAN : 2, TOUCH_ROTATE : 3, TOUCH_DOLLY : 4, TOUCH_PAN : 5 };

	var state = STATE.NONE;

	// 用于重置

	this.target0 = this.target.clone();
	this.position0 = this.object.position.clone();
	this.zoom0 = this.object.zoom;

	// 所以相机。向上是轨道轴

	var quat = new THREE.Quaternion().setFromUnitVectors( object.up, new THREE.Vector3( 0, 1, 0 ) );
	var quatInverse = quat.clone().inverse();

	// 事件

	var changeEvent = { type: 'change' };
	var startEvent = { type: 'start' };
	var endEvent = { type: 'end' };

	this.rotateLeft = function ( angle ) {

		if ( angle === undefined ) {

			angle = getAutoRotationAngle();

		}

		thetaDelta -= angle;

	};

	this.rotateUp = function ( angle ) {

		if ( angle === undefined ) {

			angle = getAutoRotationAngle();

		}

		phiDelta -= angle;

	};

	// 在世界空间中通过距离向左移动
	this.panLeft = function ( distance ) {

		var te = this.object.matrix.elements;

		// 得到矩阵的X列
		panOffset.set( te[ 0 ], te[ 1 ], te[ 2 ] );
		panOffset.multiplyScalar( - distance );

		pan.add( panOffset );

	};

	//在世界空间中通过距离向上移动
	this.panUp = function ( distance ) {

		var te = this.object.matrix.elements;

		// 得到矩阵的Y列
		panOffset.set( te[ 4 ], te[ 5 ], te[ 6 ] );
		panOffset.multiplyScalar( distance );

		pan.add( panOffset );

	};
	//在像素空间中传递x,y的变化，
  // right和down为正数
	this.pan = function ( deltaX, deltaY ) {
		var element = scope.domElement === document ? scope.domElement.body : scope.domElement;
		if ( scope.object instanceof THREE.PerspectiveCamera ) {
			//点
			var position = scope.object.position;
			var offset = position.clone().sub( scope.target );
			var targetDistance = offset.length();

			// 一半的fov是中央到屏幕的顶部
			targetDistance *= Math.tan( ( scope.object.fov / 2 ) * Math.PI / 180.0 );

			// 我们实际上不使用 screenWidth，因为透视相机固定为屏幕高度
			scope.panLeft( 2 * deltaX * targetDistance / element.clientHeight );
			scope.panUp( 2 * deltaY * targetDistance / element.clientHeight );

		} else if ( scope.object instanceof THREE.OrthographicCamera ) {

			// 拼字
			scope.panLeft( deltaX * (scope.object.right - scope.object.left) / element.clientWidth );
			scope.panUp( deltaY * (scope.object.top - scope.object.bottom) / element.clientHeight );

		} else {

			// 奥利戈日
			console.warn( '奥利戈日' );

		}

	};

	this.dollyIn = function ( dollyScale ) {

		if ( dollyScale === undefined ) {

			dollyScale = getZoomScale();

		}

		if ( scope.object instanceof THREE.PerspectiveCamera ) {

			scale /= dollyScale;

		} else if ( scope.object instanceof THREE.OrthographicCamera ) {

			scope.object.zoom = Math.max( this.minZoom, Math.min( this.maxZoom, this.object.zoom * dollyScale ) );
			scope.object.updateProjectionMatrix();
			scope.dispatchEvent( changeEvent );

		} else {

			console.warn( '未知类型' );

		}

	};

	this.dollyOut = function ( dollyScale ) {

		if ( dollyScale === undefined ) {

			dollyScale = getZoomScale();

		}

		if ( scope.object instanceof THREE.PerspectiveCamera ) {

			scale *= dollyScale;

		} else if ( scope.object instanceof THREE.OrthographicCamera ) {

			scope.object.zoom = Math.max( this.minZoom, Math.min( this.maxZoom, this.object.zoom / dollyScale ) );
			scope.object.updateProjectionMatrix();
			scope.dispatchEvent( changeEvent );

		} else {

			console.warn( '未知类型' );

		}

	};

	this.update = function () {

		var position = this.object.position;

		offset.copy( position ).sub( this.target );

		// 将偏移量旋转到“y 轴向上”空间
		offset.applyQuaternion( quat );

		// z 轴绕 y 轴的角度

		theta = Math.atan2( offset.x, offset.z );

		// 与 y 轴的角度

		phi = Math.atan2( Math.sqrt( offset.x * offset.x + offset.z * offset.z ), offset.y );

		if ( this.autoRotate &amp;&amp; state === STATE.NONE ) {

			this.rotateLeft( getAutoRotationAngle() );

		}

		theta += thetaDelta;
		phi += phiDelta;

		// 将 theta 限制在所需的限制之间
		theta = Math.max( this.minAzimuthAngle, Math.min( this.maxAzimuthAngle, theta ) );

		// 将半径限制在所需限制之间
		phi = Math.max( this.minPolarAngle, Math.min( this.maxPolarAngle, phi ) );

		// 将半径限制在所需限制之间
		phi = Math.max( EPS, Math.min( Math.PI - EPS, phi ) );

		var radius = offset.length() * scale;

		// 将半径限制在所需限制之间
		radius = Math.max( this.minDistance, Math.min( this.maxDistance, radius ) );

		// 将目标移动到平移位置
		this.target.add( pan );

		offset.x = radius * Math.sin( phi ) * Math.sin( theta );
		offset.y = radius * Math.cos( phi );
		offset.z = radius * Math.sin( phi ) * Math.cos( theta );

		// 将偏移量旋转回“相机向上矢量向上”空间
		offset.applyQuaternion( quatInverse );

		position.copy( this.target ).add( offset );

		this.object.lookAt( this.target );

		thetaDelta = 0;
		phiDelta = 0;
		scale = 1;
		pan.set( 0, 0, 0 );

		// 更新条件是：
    // 最小值（相机位移，相机旋转弧度）^2 > EPS
    // 使用小角度近似 cos(x/2) = 1 -x^2 /8

		if ( lastPosition.distanceToSquared( this.object.position ) > EPS
		    || 8 * (1 - lastQuaternion.dot(this.object.quaternion)) > EPS ) {

			this.dispatchEvent( changeEvent );

			lastPosition.copy( this.object.position );
			lastQuaternion.copy (this.object.quaternion );

		}

	};


	this.reset = function () {

		state = STATE.NONE;

		this.target.copy( this.target0 );
		this.object.position.copy( this.position0 );
		this.object.zoom = this.zoom0;

		this.object.updateProjectionMatrix();
		this.dispatchEvent( changeEvent );

		this.update();

	};

	this.getPolarAngle = function () {

		return phi;

	};

	this.getAzimuthalAngle = function () {

		return theta

	};

	function getAutoRotationAngle() {

		return 2 * Math.PI / 60 / 60 * scope.autoRotateSpeed;

	}

	function getZoomScale() {

		return Math.pow( 0.95, scope.zoomSpeed );

	}

	function onMouseDown( event ) {

		if ( scope.enabled === false ) return;
		event.preventDefault();

		if ( event.button === scope.mouseButtons.ORBIT ) {
			if ( scope.noRotate === true ) return;

			state = STATE.ROTATE;

			rotateStart.set( event.clientX, event.clientY );

		} else if ( event.button === scope.mouseButtons.ZOOM ) {
			if ( scope.noZoom === true ) return;

			state = STATE.DOLLY;

			dollyStart.set( event.clientX, event.clientY );

		} else if ( event.button === scope.mouseButtons.PAN ) {
			if ( scope.noPan === true ) return;

			state = STATE.PAN;

			panStart.set( event.clientX, event.clientY );

		}

		if ( state !== STATE.NONE ) {
			document.addEventListener( 'mousemove', onMouseMove, false );
			document.addEventListener( 'mouseup', onMouseUp, false );
			scope.dispatchEvent( startEvent );
		}

	}

	function onMouseMove( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault();

		var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

		if ( state === STATE.ROTATE ) {

			if ( scope.noRotate === true ) return;

			rotateEnd.set( event.clientX, event.clientY );
			rotateDelta.subVectors( rotateEnd, rotateStart );

			// rotating across whole screen goes 360 degrees around
			scope.rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientWidth * scope.rotateSpeed );

			// rotating up and down along whole screen attempts to go 360, but limited to 180
			scope.rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight * scope.rotateSpeed );

			rotateStart.copy( rotateEnd );

		} else if ( state === STATE.DOLLY ) {

			if ( scope.noZoom === true ) return;

			dollyEnd.set( event.clientX, event.clientY );
			dollyDelta.subVectors( dollyEnd, dollyStart );

			if ( dollyDelta.y > 0 ) {

				scope.dollyIn();

			} else if ( dollyDelta.y < 0 ) {

				scope.dollyOut();

			}

			dollyStart.copy( dollyEnd );

		} else if ( state === STATE.PAN ) {

			if ( scope.noPan === true ) return;

			panEnd.set( event.clientX, event.clientY );
			panDelta.subVectors( panEnd, panStart );

			scope.pan( panDelta.x, panDelta.y );

			panStart.copy( panEnd );

		}

		if ( state !== STATE.NONE ) scope.update();

	}

	function onMouseUp( /* event */ ) {

		if ( scope.enabled === false ) return;

		document.removeEventListener( 'mousemove', onMouseMove, false );
		document.removeEventListener( 'mouseup', onMouseUp, false );
		scope.dispatchEvent( endEvent );
		state = STATE.NONE;

	}

	function onMouseWheel( event ) {

		if ( scope.enabled === false || scope.noZoom === true || state !== STATE.NONE ) return;

		event.preventDefault();
		event.stopPropagation();

		var delta = 0;
    //兼容处理
		if ( event.wheelDelta !== undefined ) { // WebKit / Opera / Explorer 9 

			delta = event.wheelDelta;

		} else if ( event.detail !== undefined ) { // 火狐

			delta = - event.detail;

		}

		if ( delta > 0 ) {

			scope.dollyOut();

		} else if ( delta < 0 ) {

			scope.dollyIn();

		}

		scope.update();
		scope.dispatchEvent( startEvent );
		scope.dispatchEvent( endEvent );

	}

	function onKeyDown( event ) {

		if ( scope.enabled === false || scope.noKeys === true || scope.noPan === true ) return;

		switch ( event.keyCode ) {

			case scope.keys.UP:
				scope.pan( 0, scope.keyPanSpeed );
				scope.update();
				break;

			case scope.keys.BOTTOM:
				scope.pan( 0, - scope.keyPanSpeed );
				scope.update();
				break;

			case scope.keys.LEFT:
				scope.pan( scope.keyPanSpeed, 0 );
				scope.update();
				break;

			case scope.keys.RIGHT:
				scope.pan( - scope.keyPanSpeed, 0 );
				scope.update();
				break;

		}

	}

	function touchstart( event ) {

		if ( scope.enabled === false ) return;

		switch ( event.touches.length ) {

			case 1:	// 单指触摸：旋转

				if ( scope.noRotate === true ) return;

				state = STATE.TOUCH_ROTATE;

				rotateStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
				break;

			case 2:	//  双指触摸：dolly

				if ( scope.noZoom === true ) return;

				state = STATE.TOUCH_DOLLY;

				var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
				var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
				var distance = Math.sqrt( dx * dx + dy * dy );
				dollyStart.set( 0, distance );
				break;

			case 3: //三指触摸：平移

				if ( scope.noPan === true ) return;

				state = STATE.TOUCH_PAN;

				panStart.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
				break;

			default:

				state = STATE.NONE;

		}

		if ( state !== STATE.NONE ) scope.dispatchEvent( startEvent );

	}

	function touchmove( event ) {

		if ( scope.enabled === false ) return;

		event.preventDefault();
		event.stopPropagation();

		var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

		switch ( event.touches.length ) {

			case 1: // 单指触摸：旋转

				if ( scope.noRotate === true ) return;
				if ( state !== STATE.TOUCH_ROTATE ) return;

				rotateEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
				rotateDelta.subVectors( rotateEnd, rotateStart );

				// 在整个屏幕上旋转 360 度
				scope.rotateLeft( 2 * Math.PI * rotateDelta.x / element.clientWidth * scope.rotateSpeed );
				// 沿整个屏幕上下旋转尝试去 360，但限于 180
				scope.rotateUp( 2 * Math.PI * rotateDelta.y / element.clientHeight * scope.rotateSpeed );

				rotateStart.copy( rotateEnd );

				scope.update();
				break;

			case 2: // 双指触摸

				if ( scope.noZoom === true ) return;
				if ( state !== STATE.TOUCH_DOLLY ) return;

				var dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
				var dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
				var distance = Math.sqrt( dx * dx + dy * dy );

				dollyEnd.set( 0, distance );
				dollyDelta.subVectors( dollyEnd, dollyStart );

				if ( dollyDelta.y > 0 ) {

					scope.dollyOut();

				} else if ( dollyDelta.y < 0 ) {

					scope.dollyIn();

				}

				dollyStart.copy( dollyEnd );

				scope.update();
				break;

			case 3: // 三指触摸：平移

				if ( scope.noPan === true ) return;
				if ( state !== STATE.TOUCH_PAN ) return;

				panEnd.set( event.touches[ 0 ].pageX, event.touches[ 0 ].pageY );
				panDelta.subVectors( panEnd, panStart );

				scope.pan( panDelta.x, panDelta.y );

				panStart.copy( panEnd );

				scope.update();
				break;

			default:

				state = STATE.NONE;

		}

	}

	function touchend( /* event */ ) {

		if ( scope.enabled === false ) return;

		scope.dispatchEvent( endEvent );
		state = STATE.NONE;

	}

	this.domElement.addEventListener( 'contextmenu', function ( event ) { event.preventDefault(); }, false );
	this.domElement.addEventListener( 'mousedown', onMouseDown, false );
	this.domElement.addEventListener( 'mousewheel', onMouseWheel, false );
	this.domElement.addEventListener( 'DOMMouseScroll', onMouseWheel, false ); // firefox

	this.domElement.addEventListener( 'touchstart', touchstart, false );
	this.domElement.addEventListener( 'touchend', touchend, false );
	this.domElement.addEventListener( 'touchmove', touchmove, false );

	window.addEventListener( 'keydown', onKeyDown, false );

	// 在开始时强制更新
	this.update();

};

THREE.OrbitControls.prototype = Object.create( THREE.EventDispatcher.prototype );
THREE.OrbitControls.prototype.constructor = THREE.OrbitControls;

q其他拓展功能自行研究

原文地址:https://blog.csdn.net/qq_37883143/article/details/129664826

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