Cesium创建小汽车闯红灯后的闪光效果

小汽车闯红灯后的闪光效果"/>

Cesium创建小汽车闯红灯后的闪光效果

功能

需基于cesium编写小汽车闯红灯后的闪光效果

代码

创建光亮遮罩层类BrightnessMask

function defaultValue(a, b) {if (a !== undefined && a !== null) {return a;}return b;
}
function defined(value) {return value !== undefined && value !== null;
}
defaultValue.EMPTY_OBJECT = Object.freeze({});
function BrightnessMask(options) {options = defaultValue(options, defaultValue.EMPTY_OBJECT);var _brightness = defaultValue(options.brightness, 1);Object.defineProperty(this, "brightness", {get: function () {return _brightness},set: function (value) {_brightness = !defined(value) ? 1 : valuethis.instance.uniforms.brightness = _brightness},enumerable:true})this.instance = _cesium.scene.postProcessStages.add(Cesium.PostProcessStageLibrary.createBrightnessStage())this.instance.enabled = true;this.instance.uniforms.brightness = this._brightness
}
BrightnessMask.prototype.destroy = function () {if(this.instance){_cesium.scene.postProcessStages.remove(this.instance)}
}

如何使用该类？

window.brightnessMask = new BrightnessMask();
var handler = null;
function blink() {brightnessMask.brightness = 2.0;var time = new Date().getTime();handler && handler();handler = _cesium.scene.preUpdate.addEventListener(function(){if (brightnessMask.brightness == 2.0 && new Date().getTime() - time > 16){brightnessMask.brightness = 1.0;}});
}

当汽车闯红灯时，直接调用blink()即可