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Cesium-Examples/examples/cesiumEx/viewshed.js

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refactor: 求个star
2025-03-11 08:25:45 +00:00
/**
* 可视域分析。
*
* @author Helsing
* @date 2020/08/28
* @alias viewshed
* @class
* @param {Cesium.Viewer} viewer Cesium三维视窗。
* @param {Object} options 选项。
* @param {Cesium.Cartesian3} options.viewPosition 观测点位置。
* @param {Cesium.Cartesian3} options.viewPositionEnd 最远观测点位置（如果设置了观测距离，这个属性可以不设置）。
* @param {Number} options.viewDistance 观测距离（单位`米`，默认值100）。
* @param {Number} options.viewHeading 航向角（单位`度`，默认值0）。
* @param {Number} options.viewPitch 俯仰角（单位`度`，默认值0）。
* @param {Number} options.horizontalViewAngle 可视域水平夹角（单位`度`，默认值90）。
* @param {Number} options.verticalViewAngle 可视域垂直夹角（单位`度`，默认值60）。
* @param {Cesium.Color} options.visibleAreaColor 可视区域颜色（默认值`绿色`）。
* @param {Cesium.Color} options.invisibleAreaColor 不可视区域颜色（默认值`红色`）。
* @param {Boolean} options.enabled 阴影贴图是否可用。
* @param {Boolean} options.softShadows 是否启用柔和阴影。
* @param {Boolean} options.size 每个阴影贴图的大小。
*/
class viewshed extends analyser {
constructor(viewer, options) {
super(viewer);
this.viewer = viewer;
this.viewPosition = options.viewPosition;
this.viewPositionEnd = options.viewPositionEnd;
this.viewDistance = this.viewPositionEnd ? Cesium.Cartesian3.distance(this.viewPosition, this.viewPositionEnd) : (options.viewDistance || 100.0);
this.viewHeading = this.viewPositionEnd ? getHeading(this.viewPosition, this.viewPositionEnd) : (options.viewHeading || 0.0);
this.viewPitch = this.viewPositionEnd ? getPitch(this.viewPosition, this.viewPositionEnd) : (options.viewPitch || 0.0);
this.horizontalViewAngle = options.horizontalViewAngle || 90.0;
this.verticalViewAngle = options.verticalViewAngle || 60.0;
this.visibleAreaColor = options.visibleAreaColor || Cesium.Color.GREEN;
this.invisibleAreaColor = options.invisibleAreaColor || Cesium.Color.RED;
this.enabled = (typeof options.enabled === "boolean") ? options.enabled : true;
this.softShadows = (typeof options.softShadows === "boolean") ? options.softShadows : true;
this.size = options.size || 2048;
this.options = options;
this.id = Cesium.createGuid();
this._resultTip = this.viewer.entities.add({
id: this.id,
label: {
fillColor: Cesium.Color.YELLOW,
showBackground: true,
font: '14px monospace',
horizontalOrigin: Cesium.HorizontalOrigin.LEFT,
verticalOrigin: Cesium.VerticalOrigin.BOTTOM,
pixelOffset: new Cesium.Cartesian2(0, -10)
}
});
this.posArray = [];
this._markers = [];
this.state = this.BEYONANALYSER_STATE.PREPARE;
this.action();
}
action() {
let _self = this;
var ellipsoid = this.viewer.scene.globe.ellipsoid;
_self.handler.setInputAction(function (movement) {
var cartesian = latlng.getCurrentMousePosition(_self.viewer.scene, movement.position);
if (_self._markers.length == 0) {
var temp1 = Cesium.Cartographic.fromCartesian( cartesian );
var h1 ;
if (_self.options.qdOffset) {
h1 = temp1.height + _self.options.qdOffset
}else{
h1 = temp1.height + 1;
}
var cartographictemp = Cesium.Cartographic.fromDegrees( temp1.longitude / Math.PI * 180, temp1.latitude / Math.PI * 180, h1);
cartesian = ellipsoid.cartographicToCartesian(cartographictemp);
} else if (_self._markers.length == 1) {
var temp1 = Cesium.Cartographic.fromCartesian( cartesian );
var h1 ;
if (_self.options.zdOffset) {
h1 = temp1.height + _self.options.qdOffset
}else{
h1 = temp1.height + 1;
}
var cartographictemp = Cesium.Cartographic.fromDegrees( temp1.longitude / Math.PI * 180, temp1.latitude / Math.PI * 180, h1);
cartesian = ellipsoid.cartographicToCartesian(cartographictemp);
}
if (!cartesian) {
return;
}
_self.posArray.push(cartesian);
if (_self._markers.length == 0) {
var startSphere = _self.viewer.entities.add({
position: cartesian,
ellipsoid: {
radii: new Cesium.Cartesian3(1.0, 1.0, 1.0),
material: Cesium.Color.BLUE
},
label: {
text: "视线起点",
fillColor: Cesium.Color.YELLOW,
pixelOffset: {
x: 0,
y: -20
},
scale: 0.5
}
});
_self._markers.push(startSphere);
_self.state = _self.BEYONANALYSER_STATE.OPERATING;
} else if (_self._markers.length == 1) {
var redSphere = _self.viewer.entities.add({
position: cartesian,
ellipsoid: {
radii: new Cesium.Cartesian3(1.0, 1.0, 1.0),
material: Cesium.Color.RED
},
label: {
text: "视线终点",
fillColor: Cesium.Color.YELLOW,
pixelOffset: {
x: 0,
y: -20
},
scale: 0.5
}
});
_self._markers.push(redSphere);
_self.viewPosition = _self.posArray[0];
_self.viewPositionEnd = cartesian;
_self.viewDistance = _self.viewPositionEnd ? Cesium.Cartesian3.distance(_self.viewPosition, _self.viewPositionEnd) : (_self.options.viewDistance || 100.0);
_self.viewHeading = _self.viewPositionEnd ? getHeading(_self.viewPosition, _self.viewPositionEnd) : (_self.options.viewHeading || 0.0);
_self.viewPitch = _self.viewPositionEnd ? getPitch(_self.viewPosition, _self.viewPositionEnd) : (_self.options.viewPitch || 0.0);
_self.state = _self.BEYONANALYSER_STATE.END;
_self.handler.destroy();
_self.handler = null;
_self.remove();
_self.update();
}
}, Cesium.ScreenSpaceEventType.LEFT_CLICK);
//移动
var info;
_self.handler.setInputAction(function (movement) {
var cartesian = _self.viewer.scene.pickPosition(movement.endPosition);
if (_self.state === _self.BEYONANALYSER_STATE.PREPARE) {
info = '点击设定起点';
_self.showTip(_self._resultTip, true, cartesian, info);
} else if (_self.state === _self.BEYONANALYSER_STATE.OPERATING) {
info = '点击设定终点';
_self.showTip(_self._resultTip, true, cartesian, info);
}
}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);
}
remove() {
if (this._markers.length == 0) {
return false;
}
for (let index = 0; index < this._markers.length; index++) {
var element = this._markers[index];
this.viewer.entities.remove(element);
}
this._markers.length = 0;
this.viewer.entities.remove(this._resultTip);
this._resultTip = undefined;
}
add() {
this.createLightCamera();
this.createShadowMap();
this.createPostStage();
this.drawFrustumOutline();
this.drawSketch();
}
update() {
this.clear();
this.add();
}
clear() {
if (this.sketch) {
this.viewer.entities.removeById(this.sketch.id);
this.sketch = null;
}
if (this.frustumOutline) {
this.frustumOutline.destroy();
this.frustumOutline = null;
}
if (this.postStage) {
this.viewer.scene.postProcessStages.remove(this.postStage);
this.postStage = null;
}
}
//创建相机
createLightCamera() {
this.lightCamera = new Cesium.Camera(this.viewer.scene);
this.lightCamera.position = this.viewPosition;
// if (this.viewPositionEnd) {
// let direction = Cesium.Cartesian3.normalize(Cesium.Cartesian3.subtract(this.viewPositionEnd, this.viewPosition, new Cesium.Cartesian3()), new Cesium.Cartesian3());
// this.lightCamera.direction = direction; // direction是相机面向的方向
// }
this.lightCamera.frustum.near = this.viewDistance * 0.001;
this.lightCamera.frustum.far = this.viewDistance;
const hr = Cesium.Math.toRadians(this.horizontalViewAngle);
const vr = Cesium.Math.toRadians(this.verticalViewAngle);
const aspectRatio =
(this.viewDistance * Math.tan(hr / 2) * 2) /
(this.viewDistance * Math.tan(vr / 2) * 2);
this.lightCamera.frustum.aspectRatio = aspectRatio;
if (hr > vr) {
this.lightCamera.frustum.fov = hr;
} else {
this.lightCamera.frustum.fov = vr;
}
this.lightCamera.setView({
destination: this.viewPosition,
orientation: {
heading: Cesium.Math.toRadians(this.viewHeading || 0),
pitch: Cesium.Math.toRadians(this.viewPitch || 0),
roll: 0
}
});
}
//创建阴影贴图
createShadowMap() {
this.shadowMap = new Cesium.ShadowMap({
context: (this.viewer.scene).context,
lightCamera: this.lightCamera,
enabled: this.enabled,
isPointLight: true,
pointLightRadius: this.viewDistance,
cascadesEnabled: false,
size: this.size,
softShadows: this.softShadows,
normalOffset: false,
可视域分析添加地形支持
2025-06-22 07:06:26 +00:00
fromLightSource: false,
refactor: 求个star
2025-03-11 08:25:45 +00:00
});
this.viewer.scene.shadowMap = this.shadowMap;
可视域分析添加地形支持
2025-06-22 07:06:26 +00:00
// 启用地形阴影
this.viewer.scene.globe.shadows = Cesium.ShadowMode.ENABLED;
refactor: 求个star
2025-03-11 08:25:45 +00:00
}
//创建PostStage
createPostStage() {
const fs = `
#define USE_CUBE_MAP_SHADOW true
uniform sampler2D colorTexture;
uniform sampler2D depthTexture;
varying vec2 v_textureCoordinates;
uniform mat4 camera_projection_matrix;
uniform mat4 camera_view_matrix;
uniform samplerCube shadowMap_textureCube;
uniform mat4 shadowMap_matrix;
uniform vec4 shadowMap_lightPositionEC;
uniform vec4 shadowMap_normalOffsetScaleDistanceMaxDistanceAndDarkness;
uniform vec4 shadowMap_texelSizeDepthBiasAndNormalShadingSmooth;
uniform float helsing_viewDistance;
uniform vec4 helsing_visibleAreaColor;
uniform vec4 helsing_invisibleAreaColor;
struct zx_shadowParameters
{
vec3 texCoords;
float depthBias;
float depth;
float nDotL;
vec2 texelStepSize;
float normalShadingSmooth;
float darkness;
};
float czm_shadowVisibility(samplerCube shadowMap, zx_shadowParameters shadowParameters)
{
float depthBias = shadowParameters.depthBias;
float depth = shadowParameters.depth;
float nDotL = shadowParameters.nDotL;
float normalShadingSmooth = shadowParameters.normalShadingSmooth;
float darkness = shadowParameters.darkness;
vec3 uvw = shadowParameters.texCoords;
depth -= depthBias;
float visibility = czm_shadowDepthCompare(shadowMap, uvw, depth);
return czm_private_shadowVisibility(visibility, nDotL, normalShadingSmooth, darkness);
}
vec4 getPositionEC(){
return czm_windowToEyeCoordinates(gl_FragCoord);
}
vec3 getNormalEC(){
return vec3(1.);
}
vec4 toEye( vec2 uv, float depth){
vec2 xy=vec2((uv.x*2.-1.),(uv.y*2.-1.));
vec4 posInCamera=czm_inverseProjection*vec4(xy,depth,1.);
posInCamera=posInCamera/posInCamera.w;
return posInCamera;
}
vec3 pointProjectOnPlane( vec3 planeNormal, vec3 planeOrigin, vec3 point){
vec3 v01=point-planeOrigin;
float d=dot(planeNormal,v01);
return(point-planeNormal*d);
}
float getDepth( vec4 depth){
float z_window=czm_unpackDepth(depth);
z_window=czm_reverseLogDepth(z_window);
float n_range=czm_depthRange.near;
float f_range=czm_depthRange.far;
return(2.*z_window-n_range-f_range)/(f_range-n_range);
}
float shadow( vec4 positionEC){
vec3 normalEC=getNormalEC();
zx_shadowParameters shadowParameters;
shadowParameters.texelStepSize=shadowMap_texelSizeDepthBiasAndNormalShadingSmooth.xy;
shadowParameters.depthBias=shadowMap_texelSizeDepthBiasAndNormalShadingSmooth.z;
shadowParameters.normalShadingSmooth=shadowMap_texelSizeDepthBiasAndNormalShadingSmooth.w;
shadowParameters.darkness=shadowMap_normalOffsetScaleDistanceMaxDistanceAndDarkness.w;
vec3 directionEC=positionEC.xyz-shadowMap_lightPositionEC.xyz;
float distance=length(directionEC);
directionEC=normalize(directionEC);
float radius=shadowMap_lightPositionEC.w;
if(distance>radius)
{
return 2.0;
}
vec3 directionWC=czm_inverseViewRotation*directionEC;
shadowParameters.depth=distance/radius-0.0003;
shadowParameters.nDotL=clamp(dot(normalEC,-directionEC),0.,1.);
shadowParameters.texCoords=directionWC;
float visibility=czm_shadowVisibility(shadowMap_textureCube,shadowParameters);
return visibility;
}
bool visible( vec4 result)
{
result.x/=result.w;
result.y/=result.w;
result.z/=result.w;
return result.x>=-1.&&result.x<=1.
&&result.y>=-1.&&result.y<=1.
&&result.z>=-1.&&result.z<=1.;
}
void main(){
// 釉色 = 结构二维(颜色纹理, 纹理坐标)
gl_FragColor = texture2D(colorTexture, v_textureCoordinates);
// 深度 = 获取深度(结构二维(深度纹理, 纹理坐标))
float depth = getDepth(texture2D(depthTexture, v_textureCoordinates));
// 视角 = (纹理坐标, 深度)
vec4 viewPos = toEye(v_textureCoordinates, depth);
// 世界坐标
vec4 wordPos = czm_inverseView * viewPos;
// 虚拟相机中坐标
vec4 vcPos = camera_view_matrix * wordPos;
float near = .001 * helsing_viewDistance;
float dis = length(vcPos.xyz);
if(dis > near && dis < helsing_viewDistance){
// 透视投影
vec4 posInEye = camera_projection_matrix * vcPos;
// 可视区颜色
// vec4 helsing_visibleAreaColor=vec4(0.,1.,0.,.5);
// vec4 helsing_invisibleAreaColor=vec4(1.,0.,0.,.5);
if(visible(posInEye)){
float vis = shadow(viewPos);
if(vis > 0.3){
gl_FragColor = mix(gl_FragColor,helsing_visibleAreaColor,.5);
} else{
gl_FragColor = mix(gl_FragColor,helsing_invisibleAreaColor,.5);
}
}
}
}`;
const postStage = new Cesium.PostProcessStage({
fragmentShader: fs,
uniforms: {
shadowMap_textureCube: () => {
this.shadowMap.update(Reflect.get(this.viewer.scene, "_frameState"));
return Reflect.get(this.shadowMap, "_shadowMapTexture");
},
shadowMap_matrix: () => {
this.shadowMap.update(Reflect.get(this.viewer.scene, "_frameState"));
return Reflect.get(this.shadowMap, "_shadowMapMatrix");
},
shadowMap_lightPositionEC: () => {
this.shadowMap.update(Reflect.get(this.viewer.scene, "_frameState"));
return Reflect.get(this.shadowMap, "_lightPositionEC");
},
shadowMap_normalOffsetScaleDistanceMaxDistanceAndDarkness: () => {
this.shadowMap.update(Reflect.get(this.viewer.scene, "_frameState"));
const bias = this.shadowMap._pointBias;
return Cesium.Cartesian4.fromElements(
bias.normalOffsetScale,
this.shadowMap._distance,
this.shadowMap.maximumDistance,
0.0,
new Cesium.Cartesian4()
);
},
shadowMap_texelSizeDepthBiasAndNormalShadingSmooth: () => {
this.shadowMap.update(Reflect.get(this.viewer.scene, "_frameState"));
const bias = this.shadowMap._pointBias;
const scratchTexelStepSize = new Cesium.Cartesian2();
const texelStepSize = scratchTexelStepSize;
texelStepSize.x = 1.0 / this.shadowMap._textureSize.x;
texelStepSize.y = 1.0 / this.shadowMap._textureSize.y;
return Cesium.Cartesian4.fromElements(
texelStepSize.x,
texelStepSize.y,
bias.depthBias,
bias.normalShadingSmooth,
new Cesium.Cartesian4()
);
},
camera_projection_matrix: this.lightCamera.frustum.projectionMatrix,
camera_view_matrix: this.lightCamera.viewMatrix,
helsing_viewDistance: () => {
return this.viewDistance;
},
helsing_visibleAreaColor: this.visibleAreaColor,
helsing_invisibleAreaColor: this.invisibleAreaColor,
}
});
this.postStage = this.viewer.scene.postProcessStages.add(postStage);
}
//创建视锥线
drawFrustumOutline() {
const scratchRight = new Cesium.Cartesian3();
const scratchRotation = new Cesium.Matrix3();
const scratchOrientation = new Cesium.Quaternion();
const position = this.lightCamera.positionWC;
const direction = this.lightCamera.directionWC;
const up = this.lightCamera.upWC;
let right = this.lightCamera.rightWC;
right = Cesium.Cartesian3.negate(right, scratchRight);
let rotation = scratchRotation;
Cesium.Matrix3.setColumn(rotation, 0, right, rotation);
Cesium.Matrix3.setColumn(rotation, 1, up, rotation);
Cesium.Matrix3.setColumn(rotation, 2, direction, rotation);
let orientation = Cesium.Quaternion.fromRotationMatrix(rotation, scratchOrientation);
let instance = new Cesium.GeometryInstance({
geometry: new Cesium.FrustumOutlineGeometry({
frustum: this.lightCamera.frustum,
origin: this.viewPosition,
orientation: orientation
}),
id: Math.random().toString(36).substr(2),
attributes: {
color: Cesium.ColorGeometryInstanceAttribute.fromColor(
Cesium.Color.YELLOWGREEN //new Cesium.Color(0.0, 1.0, 0.0, 1.0)
),
show: new Cesium.ShowGeometryInstanceAttribute(true)
}
});
this.frustumOutline = this.viewer.scene.primitives.add(
new Cesium.Primitive({
geometryInstances: [instance],
appearance: new Cesium.PerInstanceColorAppearance({
flat: true,
translucent: false
})
})
);
}
//创建视网
drawSketch() {
this.sketch = this.viewer.entities.add({
name: 'sketch',
position: this.viewPosition,
orientation: Cesium.Transforms.headingPitchRollQuaternion(
this.viewPosition,
Cesium.HeadingPitchRoll.fromDegrees(this.viewHeading - this.horizontalViewAngle, this.viewPitch, 0.0)
),
ellipsoid: {
radii: new Cesium.Cartesian3(
this.viewDistance,
this.viewDistance,
this.viewDistance
),
// innerRadii: new Cesium.Cartesian3(2.0, 2.0, 2.0),
minimumClock: Cesium.Math.toRadians(-this.horizontalViewAngle / 2),
maximumClock: Cesium.Math.toRadians(this.horizontalViewAngle / 2),
minimumCone: Cesium.Math.toRadians(this.verticalViewAngle + 7.75),
maximumCone: Cesium.Math.toRadians(180 - this.verticalViewAngle - 7.75),
fill: false,
outline: true,
subdivisions: 256,
stackPartitions: 64,
slicePartitions: 64,
outlineColor: Cesium.Color.YELLOWGREEN
}
});
}
}
//获取偏航角
function getHeading(fromPosition, toPosition) {
let finalPosition = new Cesium.Cartesian3();
let matrix4 = Cesium.Transforms.eastNorthUpToFixedFrame(fromPosition);
Cesium.Matrix4.inverse(matrix4, matrix4);
Cesium.Matrix4.multiplyByPoint(matrix4, toPosition, finalPosition);
Cesium.Cartesian3.normalize(finalPosition, finalPosition);
return Cesium.Math.toDegrees(Math.atan2(finalPosition.x, finalPosition.y));
}
//获取俯仰角
function getPitch(fromPosition, toPosition) {
let finalPosition = new Cesium.Cartesian3();
let matrix4 = Cesium.Transforms.eastNorthUpToFixedFrame(fromPosition);
Cesium.Matrix4.inverse(matrix4, matrix4);
Cesium.Matrix4.multiplyByPoint(matrix4, toPosition, finalPosition);
Cesium.Cartesian3.normalize(finalPosition, finalPosition);
return Cesium.Math.toDegrees(Math.asin(finalPosition.z));
}
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