import Cesium from 'cesium/Cesium'
/*
流动纹理线
color 颜色
duration 持续时间 毫秒
*/
function PolylineTrailLinkMaterialProperty (color, duration) {
this._definitionChanged = new Cesium.Event()
this._color = undefined
this._colorSubscription = undefined
this.color = color
this.duration = duration
this._time = new Date().getTime()
}
Cesium.defineProperties(PolylineTrailLinkMaterialProperty.prototype, {
isConstant: {
get: function () {
return false
}
},
definitionChanged: {
get: function () {
return this._definitionChanged
}
},
color: Cesium.createPropertyDescriptor('color')
})
PolylineTrailLinkMaterialProperty.prototype.getType = function (time) {
return 'PolylineTrailLink'
}
PolylineTrailLinkMaterialProperty.prototype.getValue = function (time, result) {
// debugger
if (!Cesium.defined(result)) {
result = {}
}
result.color = Cesium.Property.getValueOrClonedDefault(
this._color,
time,
Cesium.Color.WHITE,
result.color
)
result.image = Cesium.Material.PolylineTrailLinkImage
result.time =
((new Date().getTime() - this._time) % this.duration) / this.duration
return result
}
PolylineTrailLinkMaterialProperty.prototype.equals = function (other) {
return (
this === other ||
(other instanceof PolylineTrailLinkMaterialProperty &&
Property.equals(this._color, other._color))
)
}
Cesium.PolylineTrailLinkMaterialProperty = PolylineTrailLinkMaterialProperty
Cesium.Material.PolylineTrailLinkType = 'PolylineTrailLink'
Cesium.Material.PolylineTrailLinkImage = require('../assets/layout/cable.png')
Cesium.Material.PolylineTrailLinkSource =
'czm_material czm_getMaterial(czm_materialInput materialInput)\n\
{\n\
czm_material material = czm_getDefaultMaterial(materialInput);\n\
vec2 st = materialInput.st;\n\
vec4 colorImage = texture2D(image, vec2(fract(st.s - time), st.t));\n\
material.alpha = colorImage.a * color.a;\n\
material.diffuse = (colorImage.rgb+color.rgb)/2.0;\n\
return material;\n\
}'
Cesium.Material._materialCache.addMaterial(
Cesium.Material.PolylineTrailLinkType,
{
fabric: {
type: Cesium.Material.PolylineTrailLinkType,
uniforms: {
color: new Cesium.Color(1.0, 0.0, 0.0, 0.5),
image: Cesium.Material.PolylineTrailLinkImage,
time: 0
},
source: Cesium.Material.PolylineTrailLinkSource
},
translucent: function (material) {
return true
}
}
)
this.loopMaterial = new Cesium.PolylineTrailLinkMaterialProperty(
Cesium.Color.AQUA,
3750
)