134 lines
4.3 KiB
JavaScript
134 lines
4.3 KiB
JavaScript
export default class ExplosionEffect {
|
||
constructor(viewer, obj) {
|
||
this.viewer = viewer
|
||
this.viewModel = {
|
||
emissionRate: 5,
|
||
gravity: 0.0, //设置重力参数
|
||
minimumParticleLife: 1,
|
||
maximumParticleLife: 6,
|
||
minimumSpeed: 1.0, //粒子发射的最小速度
|
||
maximumSpeed: 4.0, //粒子发射的最大速度
|
||
startScale: 0.0,
|
||
endScale: 8.0,
|
||
particleSize: 25.0,
|
||
}
|
||
this.emitterModelMatrix = new Cesium.Matrix4()
|
||
this.translation = new Cesium.Cartesian3()
|
||
this.rotation = new Cesium.Quaternion()
|
||
this.hpr = new Cesium.HeadingPitchRoll()
|
||
this.trs = new Cesium.TranslationRotationScale()
|
||
this.scene = this.viewer.scene
|
||
this.particleSystem = ''
|
||
this.entity = this.viewer.entities.add({
|
||
//选择粒子放置的坐标
|
||
position: Cesium.Cartesian3.fromDegrees(obj.lng, obj.lat, obj.height),
|
||
})
|
||
this.init()
|
||
}
|
||
|
||
init() {
|
||
const _this = this
|
||
// this.viewer.clock.shouldAnimate = true
|
||
// this.viewer.scene.globe.depthTestAgainstTerrain = false
|
||
// this.viewer.trackedEntity = this.entity;
|
||
let particleSystem = this.scene.primitives.add(
|
||
new Cesium.ParticleSystem({
|
||
image: './images/explosion.png', //生成所需粒子的图片路径
|
||
//粒子在生命周期开始时的颜色
|
||
startColor: Cesium.Color.RED.withAlpha(0.7),
|
||
//粒子在生命周期结束时的颜色
|
||
endColor: Cesium.Color.YELLOW.withAlpha(0.3),
|
||
//粒子在生命周期开始时初始比例
|
||
startScale: _this.viewModel.startScale,
|
||
//粒子在生命周期结束时比例
|
||
endScale: _this.viewModel.endScale,
|
||
//粒子发射的最小速度
|
||
minimumParticleLife: _this.viewModel.minimumParticleLife,
|
||
//粒子发射的最大速度
|
||
maximumParticleLife: _this.viewModel.maximumParticleLife,
|
||
//粒子质量的最小界限
|
||
minimumSpeed: _this.viewModel.minimumSpeed,
|
||
//粒子质量的最大界限
|
||
maximumSpeed: _this.viewModel.maximumSpeed,
|
||
//以像素为单位缩放粒子图像尺寸
|
||
imageSize: new Cesium.Cartesian2(
|
||
_this.viewModel.particleSize,
|
||
_this.viewModel.particleSize
|
||
),
|
||
//每秒发射的粒子数
|
||
emissionRate: _this.viewModel.emissionRate,
|
||
//粒子系统发射粒子的时间（秒）
|
||
lifetime: 16.0,
|
||
//设置粒子的大小是否以米或像素为单位
|
||
sizeInMeters: false,
|
||
//系统的粒子发射器
|
||
emitter: new Cesium.CircleEmitter(5.0), //BoxEmitter 盒形发射器，ConeEmitter 锥形发射器，SphereEmitter 球形发射器，CircleEmitter圆形发射器
|
||
})
|
||
)
|
||
this.particleSystem = particleSystem
|
||
this.preUpdateEvent()
|
||
}
|
||
|
||
//场景渲染事件
|
||
preUpdateEvent() {
|
||
let _this = this
|
||
this.viewer.scene.preUpdate.addEventListener(function (scene, time) {
|
||
//发射器地理位置
|
||
_this.particleSystem.modelMatrix = _this.computeModelMatrix(
|
||
_this.entity,
|
||
time
|
||
)
|
||
//发射器局部位置
|
||
_this.particleSystem.emitterModelMatrix =
|
||
_this.computeEmitterModelMatrix()
|
||
// 将发射器旋转
|
||
if (_this.viewModel.spin) {
|
||
_this.viewModel.heading += 1.0
|
||
_this.viewModel.pitch += 1.0
|
||
_this.viewModel.roll += 1.0
|
||
}
|
||
})
|
||
}
|
||
|
||
computeModelMatrix(entity, time) {
|
||
return entity.computeModelMatrix(time, new Cesium.Matrix4())
|
||
}
|
||
|
||
computeEmitterModelMatrix() {
|
||
this.hpr = Cesium.HeadingPitchRoll.fromDegrees(0.0, 0.0, 0.0, this.hpr)
|
||
this.trs.translation = Cesium.Cartesian3.fromElements(
|
||
-4.0,
|
||
0.0,
|
||
1.4,
|
||
this.translation
|
||
)
|
||
this.trs.rotation = Cesium.Quaternion.fromHeadingPitchRoll(
|
||
this.hpr,
|
||
this.rotation
|
||
)
|
||
|
||
return Cesium.Matrix4.fromTranslationRotationScale(
|
||
this.trs,
|
||
this.emitterModelMatrix
|
||
)
|
||
}
|
||
|
||
removeEvent() {
|
||
this.viewer.scene.preUpdate.removeEventListener(this.preUpdateEvent, this)
|
||
this.emitterModelMatrix = undefined
|
||
this.translation = undefined
|
||
this.rotation = undefined
|
||
this.hpr = undefined
|
||
this.trs = undefined
|
||
}
|
||
|
||
//移除粒子特效
|
||
remove() {
|
||
;() => {
|
||
return this.removeEvent()
|
||
} //清除事件
|
||
this.viewer.scene.primitives.remove(this.particleSystem) //删除粒子对象
|
||
this.viewer.entities.remove(this.entity) //删除entity
|
||
}
|
||
}
|