importScripts("config.js");
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importScripts("omcommand.js");
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var colorInfo = null;
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var colorEqually = true;
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/**
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* 海洋大面图线程
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* 金磊
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* @param {any} start
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* @param {any} end
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*/
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self.addEventListener("message", function (e) {
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colorInfo = e.data.color || colorTable;
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if (e.data.colorEqually != undefined) {
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colorEqually = e.data.colorEqually;
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}
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getCacheInfo(e.data, getImageData);
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});
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function getImageData(id, byteArray) {
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var offset = 0;
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var direction = byteArray[offset];
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offset += 1;
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var width = byteArray[offset];
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offset += 1;
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var minx = 999;
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var maxx = -999;
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for (var i = 0; i < width; i++) {
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if (minx > byteArray[offset + i]) {
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minx = byteArray[offset + i];
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}
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if (maxx < byteArray[offset + i]) {
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maxx = byteArray[offset + i];
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}
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}
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offset += width;
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var height = byteArray[offset];
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offset += 1;
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var miny = 999;
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var maxy = -999;
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for (var i = 0; i < height; i++) {
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if (miny > byteArray[offset + i]) {
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miny = byteArray[offset + i];
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}
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if (maxy < byteArray[offset + i]) {
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maxy = byteArray[offset + i];
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}
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}
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offset += height;
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var dataCount = byteArray[offset];
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offset += 1;
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var colorBar = colorInfo;
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var valMax = byteArray[byteArray.length - 1];
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var valMin = byteArray[byteArray.length - 2];
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debugger
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if (colorEqually) {
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var delta = valMax - valMin;
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delta = delta / (colorBar.length - 1);
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for (var i = 0; i < colorBar.length; i++) {
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colorBar[i][0] = valMin + i * delta;
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}
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}
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var colorgradient = segmentedColorScale(colorBar);
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var data = new Uint8Array(height * width * 4);
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for (var i = 0; i < height; i++) {
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for (var j = 0; j < width; j++) {
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var m = (i * width + j) * 4;
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var value = byteArray[(height - i - 1) * width + j + offset];
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if (value == -9999) {
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data[m] = 0;
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data[m + 1] = 0;
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data[m + 2] = 0;
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data[m + 3] = 0;
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} else {
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//value = Math.sqrt(Math.sqrt(value * value) * 1000);
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var rgba = colorgradient(value, RD_OVERLAY_ALPHA);
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data[m] = rgba[0];
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data[m + 1] = rgba[1];
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data[m + 2] = rgba[2];
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data[m + 3] = rgba[3];
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}
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}
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}
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self.postMessage({
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id: id,
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width: width,
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height: height,
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minx: minx,
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maxx: maxx,
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miny: miny,
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maxy: maxy,
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offset: offset,
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data: byteArray,
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arrayBufferView: data,
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});
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}
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