122 lines
3.4 KiB
JavaScript
122 lines
3.4 KiB
JavaScript
/*
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* @Description: 雷达扫描效果
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*/
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function RadarScan() {
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class RadarScanMaterialProperty {
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constructor(options) {
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this._definitionChanged = new Cesium.Event();
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this._color = undefined;
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this._speed = undefined;
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this.color = options.color;
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this.speed = options.speed;
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this.transparency = options.transparency;
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}
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get isConstant() {
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return false;
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}
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get definitionChanged() {
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return this._definitionChanged;
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}
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getType(time) {
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return Cesium.Material.RadarScanMaterialType;
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}
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getValue(time, result) {
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if (!Cesium.defined(result)) {
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result = {};
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}
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result.color = Cesium.Property.getValueOrDefault(
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this._color,
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time,
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Cesium.Color.RED,
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result.color
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);
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result.speed = Cesium.Property.getValueOrDefault(
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this._speed,
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time,
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10,
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result.speed
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);
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result.transparency = this.transparency;
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result.frameNumber = Cesium.getTimestamp();
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return result;
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}
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equals(other) {
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return (
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this === other ||
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(other instanceof RadarScanMaterialProperty &&
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Cesium.Property.equals(this._color, other._color) &&
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Cesium.Property.equals(this._speed, other._speed) &&
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Cesium.Property.equals(this.transparency, other.transparency))
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);
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}
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}
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Object.defineProperties(RadarScanMaterialProperty.prototype, {
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color: Cesium.createPropertyDescriptor("color"),
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speed: Cesium.createPropertyDescriptor("speed"),
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transparency: Cesium.createPropertyDescriptor("transparency"),
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});
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Cesium.RadarScanMaterialProperty = RadarScanMaterialProperty;
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Cesium.Material.RadarScanMaterialProperty = "RadarScanMaterialProperty";
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Cesium.Material.RadarScanMaterialType = "RadarScanMaterialType";
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Cesium.Material.RadarScanMaterialSource = `
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uniform vec4 color;
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uniform float speed;
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uniform float transparency;
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uniform float frameNumber;
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#define PI 3.14159265359
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czm_material czm_getMaterial(czm_materialInput materialInput){
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czm_material material = czm_getDefaultMaterial(materialInput);
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vec2 st = materialInput.st;
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vec2 scrPt = st * 2.0 - 1.0;
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float time = frameNumber * speed / 30000.0 ;
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vec3 col = vec3(0.0);
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mat2 rot;
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float theta = -time * 1.0 * PI - 2.2;
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float cosTheta, sinTheta;
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cosTheta = cos(theta);
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sinTheta = sin(theta);
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rot[0][0] = cosTheta;
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rot[0][1] = -sinTheta;
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rot[1][0] = sinTheta;
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rot[1][1] = cosTheta;
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vec2 scrPtRot = rot * scrPt;
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float angle = 1.0 - (atan(scrPtRot.y, scrPtRot.x) / 6.2831 + 0.5);
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float falloff = length(scrPtRot);
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material.alpha = pow(length(col + vec3(.5)),5.0) * transparency * 0.6;
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material.diffuse = (0.5 + pow(angle, 2.0) * falloff ) * color.rgb ;
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return material;
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}
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`;
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Cesium.Material._materialCache.addMaterial(
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Cesium.Material.RadarScanMaterialType,
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{
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fabric: {
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type: Cesium.Material.RadarScanMaterialType,
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uniforms: {
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color: new Cesium.Color(1.0, 0.0, 0.0, 1.0),
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speed: 10.0,
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transparency: 1,
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frameNumber: Cesium.getTimestamp(),
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},
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source: Cesium.Material.RadarScanMaterialSource,
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},
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translucent: function (material) {
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return true;
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},
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}
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);
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}
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export { RadarScan } |