importScripts("config.js");
importScripts("transform.js");
importScripts("omcommand.js");
var uvInfo = {
rCount: 0,
uData: null,
vData: null,
oData: null,
offset: 0,
minx: 0.0,
miny: 0.0,
dx: 0.0,
dy: 0.0,
width: 0.0,
height: 0.0,
uMax: 0.0,
uMin: 0.0,
vMax: 0.0,
vMin: 0.0,
valMax: 0.0,
valMin: 0.0,
drawData: [],
};
var myScene = null;
var columns = []; //数据存储数组。每次刷新更新这个数组
var τ = 2 * Math.PI; //他不是一个π。。是两个。。
var VSCALE = 0.00036666666666666667; //速度
var H = 0.000036; // 0.0000360°φ ~= 4m 随便给的值，为了平面数据到球面产生的偏移计算
var HOLE_VECTOR = [NaN, NaN, null]; // 向量不存在时存储的值
var velocityScale = 0;
var oceanCancel = false; //是否取消加载
/**
* 海洋流场图线程
* 金磊
* @param {any} start
* @param {any} end
*/
self.addEventListener("message", function (e) {
var option = e.data;
if (e.data.colorEqually != undefined) {
colorEqually = e.data.colorEqually;
}
myScene = option.scene;
if (myScene && myScene.height) {
velocityScale = myScene.height * VSCALE;
}
clear();
switch (option.type) {
case "init":
initData(option);
break;
case "update":
if (uvInfo.uData != null && uvInfo.vData != null) {
dataProcess();
}
break;
case "stop":
break;
default:
break;
}
});
function clear() {
oceanCancel = true;
}
function initData(option) {
uvInfo.uData = null;
uvInfo.vData = null;
getData(
{
id: "u",
url: option.upath,
},
function (id, byteArray) {
uvInfo.uData = byteArray;
if (uvInfo.vData != null) {
oceanLineCalc();
}
}
);
getData(
{
id: "v",
url: option.vpath,
},
function (id, byteArray) {
uvInfo.vData = byteArray;
if (uvInfo.uData != null) {
oceanLineCalc();
}
}
);
// getCacheInfo(
// {
// id: "u",
// ncpath: option.uncpath,
// variable: option.uvariable,
// depth: option.depth,
// },
// function (id, byteArray) {
// uvInfo.uData = byteArray;
// if (uvInfo.vData != null) {
// oceanLineCalc();
// }
// }
// );
// getCacheInfo(
// {
// id: "v",
// ncpath: option.vncpath,
// variable: option.vvariable,
// depth: option.depth,
// },
// function (id, byteArray) {
// uvInfo.vData = byteArray;
// if (uvInfo.uData != null) {
// oceanLineCalc();
// }
// }
// );
}
function distort(λ, φ, x, y, wind) {
var u = wind[0] * velocityScale;
var v = wind[1] * velocityScale;
var hλ = λ < 0 ? H : -H;
var hφ = φ < 0 ? H : -H;
var pλ = projection([λ + hλ, φ]);
var pφ = projection([λ, φ + hφ]);
var k = Math.cos((φ / 360) * τ);
var d = [
(pλ.x - x) / hλ / k,
(pλ.y - y) / hλ / k,
(pφ.x - x) / hφ,
(pφ.y - y) / hφ,
];
// Scale distortion vectors by u and v, then add.
wind[0] = d[0] * u + d[2] * v;
wind[1] = d[1] * u + d[3] * v;
return wind;
}
function getDataByIndex(i, j) {
var index = i * uvInfo.width + j + uvInfo.offset;
if (index > uvInfo.uData.length) return [undefined, undefined];
return [uvInfo.uData[index], uvInfo.vData[index]];
}
function floorMod(a, n) {
var f = a - n * Math.floor(a / n);
return f === n ? 0 : f;
}
function isValue(x) {
if (
x[0] != undefined &&
x[1] != undefined &&
x[0] != -9999 &&
x[1] != -9999
) {
return true;
}
return false;
}
function getDegreesData(x, y) {
var i = floorMod(x - uvInfo.minx, 360) / uvInfo.dx;
var j = (y - uvInfo.miny) / uvInfo.dy;
// 1 2
// fi i ci
// | =1.4 |
// ---G--|---G--- fj 8
// j ___|_ . |
// =8.3 | |
// ---G------G--- cj 9
// | |
if (i > uvInfo.width || j > uvInfo.height || j < 0 || i < 0) return null;
var fi = Math.floor(i),
ci = fi + 1;
var fj = Math.floor(j),
cj = fj + 1;
var g00 = getDataByIndex(cj, fi);
var g10 = getDataByIndex(cj, ci);
var g01 = getDataByIndex(fj, fi);
var g11 = getDataByIndex(fj, ci);
if (isValue(g00) && isValue(g10) && isValue(g01) && isValue(g11)) {
return bilinearInterpolateVector(i - fi, cj - j, g00, g10, g01, g11);
}
return null;
}
//获取数据信息，这里以u数据为准。正常数据u、v数据信息应该是相同的。
function getDataInfo() {
var offset = 0;
var direction = uvInfo.uData[offset];
offset += 1;
var width = uvInfo.uData[offset];
offset += 1;
var minx = 999;
var maxx = -999;
for (var i = 0; i < width; i++) {
if (minx > uvInfo.uData[offset + i]) {
minx = uvInfo.uData[offset + i];
}
if (maxx < uvInfo.uData[offset + i]) {
maxx = uvInfo.uData[offset + i];
}
}
offset += width;
uvInfo.dx = (maxx - minx) / (width - 1);
uvInfo.minx = minx;
uvInfo.width = width;
var height = uvInfo.uData[offset];
offset += 1;
var miny = 999;
var maxy = -999;
for (var i = 0; i < height; i++) {
if (miny > uvInfo.uData[offset + i]) {
miny = uvInfo.uData[offset + i];
}
if (maxy < uvInfo.uData[offset + i]) {
maxy = uvInfo.uData[offset + i];
}
}
offset += height;
uvInfo.dy = (maxy - miny) / (height - 1);
uvInfo.miny = miny;
uvInfo.height = height;
var dataCount = uvInfo.uData[offset];
offset += 1;
uvInfo.offset = offset;
var uMax = uvInfo.uData[uvInfo.uData.length - 1];
var uMin = uvInfo.uData[uvInfo.uData.length - 2];
var vMax = uvInfo.vData[uvInfo.vData.length - 1];
var vMin = uvInfo.vData[uvInfo.vData.length - 2];
uvInfo.uMax = Math.max(Math.abs(uMax), Math.abs(uMin));
uvInfo.uMin = 0;
uvInfo.vMax = Math.max(Math.abs(vMax), Math.abs(vMin));
uvInfo.vMin = 0;
//console.time("111");
var valMax = -999;
var valMin = 999;
for (var i = offset; i < uvInfo.uData.length - 3; i++) {
var uVal = uvInfo.uData[i];
var vVal = uvInfo.vData[i];
if (uVal != -9999 && vVal != -9999) {
var val = Math.sqrt(uVal * uVal + vVal * vVal);
if (valMax < val) valMax = val;
if (valMin > val) valMin = val;
}
}
uvInfo.valMax = valMax;
uvInfo.valMin = valMin;
//console.timeEnd("111");
}
function dataProcess() {
if (myScene) {
for (var i = 0; i < myScene.width; i += 2) {
var column = [];
for (var j = 0; j < myScene.height; j += 2) {
var coord = tempgetCoord(i, j);
if (coord != null) {
var wind = null;
if (coord) {
var λ = coord[0],
φ = coord[1];
if (isFinite(λ)) {
wind = getDegreesData(λ, φ);
if (wind) {
wind = distort(λ, φ, i, j, wind);
}
}
}
column[j + 1] = column[j] = wind || HOLE_VECTOR;
}
}
columns[i + 1] = columns[i] = column;
}
//animate();
uvInfo.drawData = columns;
self.postMessage({
type: "draw",
data: uvInfo,
});
}
}
function colorStyles(val) {
var i;
for (i = 0; i < colorInfo.length; i++) {
if (Math.abs(val) <= colorInfo[i][0]) {
break;
}
}
var color = colorInfo[i][1];
return (
"rgba(" +
color[0] +
", " +
color[1] +
", " +
color[2] +
", " +
RD_OVERLAY_ALPHA +
")"
);
}
function oceanLineCalc() {
if (uvInfo.uData == null || uvInfo.vData == null) {
return;
}
getDataInfo();
dataProcess();
}
