/*
|
* Radar Scan from center
|
*/
|
|
(function (window) {
|
'use strict';
|
|
function define_CesiumRadarScan(){
|
//Main object
|
var CesiumRadarScan = {};
|
|
/*
|
* 添加雷达扫描线
|
* viewer
|
* cartographicCenter 扫描中心
|
* radius 半径 米
|
* scanColor 扫描颜色
|
* duration 持续时间 毫秒
|
*/
|
function AddRadarScanPostStage(viewer, cartographicCenter, radius, scanColor, duration) {
|
var ScanSegmentShader =
|
"uniform sampler2D colorTexture;\n" +
|
"uniform sampler2D depthTexture;\n" +
|
"varying vec2 v_textureCoordinates;\n" +
|
"uniform vec4 u_scanCenterEC;\n" +
|
"uniform vec3 u_scanPlaneNormalEC;\n" +
|
"uniform vec3 u_scanLineNormalEC;\n" +
|
"uniform float u_radius;\n" +
|
"uniform vec4 u_scanColor;\n" +
|
"vec4 toEye(in vec2 uv, in float depth)\n" +
|
" {\n" +
|
" vec2 xy = vec2((uv.x * 2.0 - 1.0),(uv.y * 2.0 - 1.0));\n" +
|
" vec4 posInCamera = czm_inverseProjection * vec4(xy, depth, 1.0);\n" +
|
" posInCamera = posInCamera / posInCamera.w;\n" +
|
" return posInCamera;\n" +
|
" }\n" +
|
"bool isPointOnLineRight(in vec3 ptOnLine, in vec3 lineNormal, in vec3 testPt)\n" +
|
"{\n" +
|
"vec3 v01 = testPt - ptOnLine;\n" +
|
"normalize(v01);\n" +
|
"vec3 temp = cross(v01, lineNormal);\n" +
|
"float d = dot(temp, u_scanPlaneNormalEC);\n" +
|
"return d > 0.5;\n" +
|
"}\n" +
|
"vec3 pointProjectOnPlane(in vec3 planeNormal, in vec3 planeOrigin, in vec3 point)\n" +
|
"{\n" +
|
"vec3 v01 = point - planeOrigin;\n" +
|
"float d = dot(planeNormal, v01) ;\n" +
|
"return (point - planeNormal * d);\n" +
|
"}\n" +
|
"float distancePointToLine(in vec3 ptOnLine, in vec3 lineNormal, in vec3 testPt)\n" +
|
"{\n" +
|
"vec3 tempPt = pointProjectOnPlane(lineNormal, ptOnLine, testPt);\n" +
|
"return length(tempPt - ptOnLine);\n" +
|
"}\n" +
|
"float getDepth(in vec4 depth)\n" +
|
"{\n" +
|
"float z_window = czm_unpackDepth(depth);\n" +
|
"z_window = czm_reverseLogDepth(z_window);\n" +
|
"float n_range = czm_depthRange.near;\n" +
|
"float f_range = czm_depthRange.far;\n" +
|
"return (2.0 * z_window - n_range - f_range) / (f_range - n_range);\n" +
|
"}\n" +
|
"void main()\n" +
|
"{\n" +
|
"gl_FragColor = texture2D(colorTexture, v_textureCoordinates);\n" +
|
"float depth = getDepth(texture2D(depthTexture, v_textureCoordinates));\n" +
|
"vec4 viewPos = toEye(v_textureCoordinates, depth);\n" +
|
"vec3 prjOnPlane = pointProjectOnPlane(u_scanPlaneNormalEC.xyz, u_scanCenterEC.xyz, viewPos.xyz);\n" +
|
"float dis = length(prjOnPlane.xyz - u_scanCenterEC.xyz);\n" +
|
"float twou_radius = u_radius * 2.0;\n" +
|
"if(dis < u_radius)\n" +
|
"{\n" +
|
"float f0 = 1.0 - abs(u_radius - dis) / u_radius;\n" +
|
"f0 = pow(f0, 64.0);\n" +
|
"vec3 lineEndPt = vec3(u_scanCenterEC.xyz) + u_scanLineNormalEC * u_radius;\n" +
|
"float f = 0.0;\n" +
|
"if(isPointOnLineRight(u_scanCenterEC.xyz, u_scanLineNormalEC.xyz, prjOnPlane.xyz))\n" +
|
"{\n" +
|
"float dis1 = length(prjOnPlane.xyz - lineEndPt);\n" +
|
"f = abs(twou_radius - dis1) / twou_radius;\n" +
|
"f = pow(f, 6.0);\n" +
|
"}\n" +
|
"gl_FragColor = mix(gl_FragColor, u_scanColor, f + f0);\n" +
|
"}\n" +
|
"}\n";
|
var _Cartesian3Center = Cesium.Cartographic.toCartesian(cartographicCenter);
|
var _Cartesian4Center = new Cesium.Cartesian4(_Cartesian3Center.x, _Cartesian3Center.y, _Cartesian3Center.z, 1);
|
var _CartographicCenter1 = new Cesium.Cartographic(cartographicCenter.longitude, cartographicCenter.latitude, cartographicCenter.height + 500);
|
var _Cartesian3Center1 = Cesium.Cartographic.toCartesian(_CartographicCenter1);
|
var _Cartesian4Center1 = new Cesium.Cartesian4(_Cartesian3Center1.x, _Cartesian3Center1.y, _Cartesian3Center1.z, 1);
|
var _CartographicCenter2 = new Cesium.Cartographic(cartographicCenter.longitude + Cesium.Math.toRadians(0.001), cartographicCenter.latitude, cartographicCenter.height);
|
var _Cartesian3Center2 = Cesium.Cartographic.toCartesian(_CartographicCenter2);
|
var _Cartesian4Center2 = new Cesium.Cartesian4(_Cartesian3Center2.x, _Cartesian3Center2.y, _Cartesian3Center2.z, 1);
|
var _RotateQ = new Cesium.Quaternion();
|
var _RotateM = new Cesium.Matrix3();
|
var _time = (new Date()).getTime();
|
var _scratchCartesian4Center = new Cesium.Cartesian4();
|
var _scratchCartesian4Center1 = new Cesium.Cartesian4();
|
var _scratchCartesian4Center2 = new Cesium.Cartesian4();
|
var _scratchCartesian3Normal = new Cesium.Cartesian3();
|
var _scratchCartesian3Normal1 = new Cesium.Cartesian3();
|
var ScanPostStage = new Cesium.PostProcessStage({
|
fragmentShader: ScanSegmentShader,
|
uniforms: {
|
u_scanCenterEC: function () {
|
return Cesium.Matrix4.multiplyByVector(viewer.camera._viewMatrix, _Cartesian4Center, _scratchCartesian4Center);
|
},
|
u_scanPlaneNormalEC: function () {
|
var temp = Cesium.Matrix4.multiplyByVector(viewer.camera._viewMatrix, _Cartesian4Center, _scratchCartesian4Center);
|
var temp1 = Cesium.Matrix4.multiplyByVector(viewer.camera._viewMatrix, _Cartesian4Center1, _scratchCartesian4Center1);
|
_scratchCartesian3Normal.x = temp1.x - temp.x;
|
_scratchCartesian3Normal.y = temp1.y - temp.y;
|
_scratchCartesian3Normal.z = temp1.z - temp.z;
|
Cesium.Cartesian3.normalize(_scratchCartesian3Normal, _scratchCartesian3Normal);
|
return _scratchCartesian3Normal;
|
},
|
u_radius: radius,
|
u_scanLineNormalEC: function () {
|
var temp = Cesium.Matrix4.multiplyByVector(viewer.camera._viewMatrix, _Cartesian4Center, _scratchCartesian4Center);
|
var temp1 = Cesium.Matrix4.multiplyByVector(viewer.camera._viewMatrix, _Cartesian4Center1, _scratchCartesian4Center1);
|
var temp2 = Cesium.Matrix4.multiplyByVector(viewer.camera._viewMatrix, _Cartesian4Center2, _scratchCartesian4Center2);
|
_scratchCartesian3Normal.x = temp1.x - temp.x;
|
_scratchCartesian3Normal.y = temp1.y - temp.y;
|
_scratchCartesian3Normal.z = temp1.z - temp.z;
|
Cesium.Cartesian3.normalize(_scratchCartesian3Normal, _scratchCartesian3Normal);
|
_scratchCartesian3Normal1.x = temp2.x - temp.x;
|
_scratchCartesian3Normal1.y = temp2.y - temp.y;
|
_scratchCartesian3Normal1.z = temp2.z - temp.z;
|
var tempTime = (((new Date()).getTime() - _time) % duration) / duration;
|
Cesium.Quaternion.fromAxisAngle(_scratchCartesian3Normal, tempTime * Cesium.Math.PI * 2, _RotateQ);
|
Cesium.Matrix3.fromQuaternion(_RotateQ, _RotateM);
|
Cesium.Matrix3.multiplyByVector(_RotateM, _scratchCartesian3Normal1, _scratchCartesian3Normal1);
|
Cesium.Cartesian3.normalize(_scratchCartesian3Normal1, _scratchCartesian3Normal1);
|
return _scratchCartesian3Normal1;
|
},
|
u_scanColor: scanColor
|
}
|
});
|
viewer.scene.postProcessStages.add(ScanPostStage);
|
return ScanPostStage;
|
}
|
|
CesiumRadarScan.add = function(options){
|
var CartographicCenter = new Cesium.Cartographic(Cesium.Math.toRadians(options.lon), Cesium.Math.toRadians(options.lat), 0);
|
var ScanPostStage = AddRadarScanPostStage(options.viewer, CartographicCenter, options.maxRadius, options.scanColor, options.duration);
|
return ScanPostStage;
|
};
|
|
CesiumRadarScan.removes = function(viewer,ScanPostStages){
|
for ( var i = 0; i < ScanPostStages.length; i++) {
|
viewer.scene.postProcessStages.remove(ScanPostStages[i]);
|
}
|
};
|
|
return CesiumRadarScan;
|
}
|
|
if (typeof(CesiumRadarScan) === 'undefined') {
|
window.CesiumRadarScan = define_CesiumRadarScan();
|
} else {
|
console.log("CesiumRadarScan already defined.");
|
}
|
})(window);
|
