Export of spectrum analyzer data to Csv file

index.html

@@ -472,7 +472,9 @@ <h4>Workspace</h4>
                                 <option value="5">Auto</option>
                             </select>
                         </div>
-
+                        <div id="spectrumExport" data-toggle="tooltip" title="Export spectrum to CSV">
+                            <button id="btn-spectrum-export" type="button">Export to Csv</button>
+                        </div>
                         <div id="analyserResize" class="btn-nobg view-analyser-fullscreen" data-toggle="tooltip" title="Zoom Analyser Window">
                             <span class="glyphicon glyphicon-resize-full"></span>
                             <span class="glyphicon glyphicon-resize-small"></span>

public/js/webworkers/csv-export-worker.js

@@ -2,59 +2,59 @@ importScripts("/js/lodash.min.js");
 
 onmessage = function(event) {
 
-    /**
-     * Converts `null` and other empty non-numeric values to empty string.
-     * 
-     * @param {object} value is not a number
-     * @returns {string}
-     */
-    function normalizeEmpty(value) {
-        return !!value ? value : "";
-    }
+  /**
+   * Converts `null` and other empty non-numeric values to empty string.
+   *
+   * @param {object} value is not a number
+   * @returns {string}
+   */
+  function normalizeEmpty(value) {
+    return !!value ? value : "";
+  }
 
-    /**
-     * @param {array} columns 
-     * @returns {string}
-     */
-    function joinColumns(columns) {
-        return _(columns)
-            .map(value => 
-                _.isNumber(value)
-                ? value
-                : stringDelim + normalizeEmpty(value) + stringDelim)
-            .join(opts.columnDelimiter);
-    }
+  /**
+   * @param {array} columns
+   * @returns {string}
+   */
+  function joinColumns(columns) {
+    return _(columns)
+      .map(value =>
+        _.isNumber(value)
+        ? value
+        : stringDelim + normalizeEmpty(value) + stringDelim)
+      .join(opts.columnDelimiter);
+  }
 
-    /**
-     * Converts `null` entries in columns and other empty non-numeric values to NaN value string.
-     * 
-     * @param {array} columns 
-     * @returns {string}
-     */
-    function joinColumnValues(columns) {
-        return _(columns)
-            .map(value => 
-                (_.isNumber(value) || _.value)
-                ? value
-                : "NaN")
-            .join(opts.columnDelimiter);
-    }
+  /**
+   * Converts `null` entries in columns and other empty non-numeric values to NaN value string.
+   *
+   * @param {array} columns
+   * @returns {string}
+   */
+  function joinColumnValues(columns) {
+    return _(columns)
+      .map(value =>
+        (_.isNumber(value) || _.value)
+        ? value
+        : "NaN")
+      .join(opts.columnDelimiter);
+  }
 
-    let opts = event.data.opts,
-        stringDelim = opts.quoteStrings
-            ? opts.stringDelimiter
-            : "",
-        mainFields = _([joinColumns(event.data.fieldNames)])
-            .concat(_(event.data.frames)
-                .flatten()
-                .map(row => joinColumnValues(row))
-                .value())
-            .join("\n"),
-        headers = _(event.data.sysConfig)
-            .map((value, key) => joinColumns([key, value]))
-            .join("\n"),
-        result = headers + "\n" + mainFields;
+  let opts = event.data.opts,
+    stringDelim = opts.quoteStrings
+      ? opts.stringDelimiter
+      : "",
+    mainFields = _([joinColumns(event.data.fieldNames)])
+      .concat(_(event.data.frames)
+        .flatten()
+        .map(row => joinColumnValues(row))
+        .value())
+      .join("\n"),
+    headers = _(event.data.sysConfig)
+      .map((value, key) => joinColumns([key, value]))
+      .join("\n"),
+    result = headers + "\n" + mainFields;
+
+  postMessage(result);
 
-    postMessage(result);
-
 };

public/js/webworkers/spectrum-export-worker.js

@@ -0,0 +1,14 @@
+onmessage = function(event) {
+  const columnDelimiter = event.data.opts.columnDelimiter;
+  const fftOutput = event.data.fftOutput;
+  const spectrumDataLength = fftOutput.length / 2;
+  const frequencyStep = 0.5 * event.data.blackBoxRate / spectrumDataLength;
+
+  let outText = "freq" + columnDelimiter + "value" + "\n";
+  for (let index = 0; index < spectrumDataLength; index += 10) {
+    const frequency = frequencyStep * index;
+    outText += frequency.toString() + columnDelimiter + fftOutput[index].toString() + "\n";
+  }
+
+  postMessage(outText);
+};

src/css/main.css

@@ -629,10 +629,28 @@ html.has-analyser-fullscreen.has-analyser
   color: black;
 }
 
-.analyser #analyserResize:hover {
-  color: white;
-  cursor: pointer;
-  animation: ease-in 500ms;
+.analyser:hover .non-shift #spectrumExport {
+  opacity: 1;
+  height: auto;
+  transition: opacity 500ms ease-in;
+}
+
+.analyser #spectrumExport {
+  height: 0;
+  width: 200px;
+  overflow: hidden;
+  opacity: 0;
+  left: 270px;
+  float: left;
+  z-index: 9;
+  position: absolute;
+  font-size: 9px;
+}
+
+.analyser #spectrumExport select {
+  border-radius: 3px;
+  padding: 0px 5px;
+  color: black;
 }
 
 .analyser input#analyserZoomX {

src/graph_spectrum.js

@@ -6,6 +6,7 @@ import {
   SPECTRUM_OVERDRAW_TYPE,
 } from "./graph_spectrum_plot";
 import { PrefStorage } from "./pref_storage";
+import { SpectrumExporter } from "./spectrum-exporter";
 
 export function FlightLogAnalyser(flightLog, canvas, analyserCanvas) {
   const ANALYSER_LARGE_LEFT_MARGIN = 10,
@@ -95,7 +96,7 @@ export function FlightLogAnalyser(flightLog, canvas, analyserCanvas) {
         left: `${newSize.width - 20}px`,
       });
       $("#analyserResize", parentElem).css({
-        left: `${newSize.width - 28}px`,
+        left: `${newSize.width - 20}px`,
       });
     };
 
@@ -201,7 +202,7 @@ export function FlightLogAnalyser(flightLog, canvas, analyserCanvas) {
 
     spectrumTypeElem
       .change(function () {
-        let optionSelected = parseInt(spectrumTypeElem.val(), 10);
+        const optionSelected = parseInt(spectrumTypeElem.val(), 10);
 
         if (optionSelected != userSettings.spectrumType) {
           userSettings.spectrumType = optionSelected;
@@ -224,6 +225,8 @@ export function FlightLogAnalyser(flightLog, canvas, analyserCanvas) {
           "onlyFullScreenException",
           pidErrorVsSetpointSelected
         );
+
+        $("#btn-spectrum-export").attr("disabled", optionSelected != 0);
       })
       .change();
 
@@ -282,6 +285,10 @@ export function FlightLogAnalyser(flightLog, canvas, analyserCanvas) {
         prefs.set("userSettings", data);
       });
     }
+
+    this.exportSpectrumToCSV = function(onSuccess, options) {
+      SpectrumExporter(fftData, options).dump(onSuccess);
+    };
   } catch (e) {
     console.log(`Failed to create analyser... error:${e}`);
   }

src/main.js

@@ -4,7 +4,6 @@ import { throttle } from "throttle-debounce";
 import { MapGrapher } from "./graph_map.js";
 import { FlightLogGrapher } from "./grapher.js";
 import { FlightLogVideoRenderer } from "./flightlog_video_renderer.js";
-import { VideoExportDialog } from "./video_export_dialog.js";
 import { UserSettingsDialog } from "./user_settings_dialog.js";
 import { GraphConfigurationDialog } from "./graph_config_dialog.js";
 import { HeaderDialog } from "./header_dialog.js";
@@ -1143,17 +1142,27 @@ function BlackboxLogViewer() {
       "csv",
       "text/csv",
       file,
-      performance.now()
+      performance.now(),
     );
     CsvExporter(flightLog, options).dump(onSuccess);
   }
 
+  function exportSpectrumToCsv(file, options = {}) {
+    const onSuccess = createExportCallback(
+      "csv",
+      "text/csv",
+      file,
+      performance.now(),
+    );
+    graph.getAnalyser().exportSpectrumToCSV(onSuccess, options);
+  }
+
   function exportGpx(file) {
     const onSuccess = createExportCallback(
       "gpx",
       "GPX File",
       file,
-      performance.now()
+      performance.now(),
     );
     GpxExporter(flightLog).dump(onSuccess);
   }
@@ -1719,6 +1728,13 @@ function BlackboxLogViewer() {
       exportCsv();
       e.preventDefault();
     });
+
+    $("#btn-spectrum-export").click(function (e) {
+      setGraphState(GRAPH_STATE_PAUSED);
+      exportSpectrumToCsv("bf_spectrum");
+      e.preventDefault();
+    });
+
     $(".btn-gpx-export").click(function (e) {
       setGraphState(GRAPH_STATE_PAUSED);
       exportGpx();

src/spectrum-exporter.js

@@ -0,0 +1,42 @@
+/**
+ * @typedef {object} ExportOptions
+ * @property {string} columnDelimiter
+ * @property {string} stringDelimiter
+ * @property {boolean} quoteStrings
+ */
+
+/**
+ * @constructor
+ * @param {object} fftOutput
+ * @param {ExportOptions} [opts={}]
+ */
+export function SpectrumExporter(fftData, opts = {}) {
+  opts = _.merge(
+    {
+      columnDelimiter: ",",
+      quoteStrings: true,
+    },
+    opts,
+  );
+
+  /**
+   * @param {function} success is a callback triggered when export is done
+   */
+  function dump(success) {
+    const worker = new Worker("/js/webworkers/spectrum-export-worker.js");
+
+    worker.onmessage = (event) => {
+      success(event.data);
+      worker.terminate();
+    };
+
+    worker.postMessage({fftOutput: fftData.fftOutput,
+                        blackBoxRate: fftData.blackBoxRate,
+                        opts: opts});
+  }
+
+  // exposed functions
+  return {
+    dump: dump,
+  };
+}