first attempt at an automatically calibrating waterfall

htdocs/css/openwebrx-globals.css

@@ -11,6 +11,11 @@ html, body
     display: inline-block;
 }
 
+.openwebrx-button.highlighted .sprite {
+    background-image: linear-gradient(rgba(255,127,0,0.5), rgba(255,127,0,0.5)), url(../gfx/openwebrx-sprites.png);
+    background-blend-mode: overlay;
+}
+
 @media only screen and (-webkit-min-device-pixel-ratio: 2),
 only screen and (min-device-pixel-ratio: 2) {
     .sprite {

htdocs/css/openwebrx.css

@@ -435,7 +435,7 @@ input[type=range]:disabled {
 	display: inline-block;
 }
 
-.openwebrx-button:hover, .openwebrx-demodulator-button.highlighted
+.openwebrx-button:hover, .openwebrx-demodulator-button.highlighted, .openwebrx-button.highlighted
 {
 	/*background:-webkit-gradient( linear, left top, left bottom, color-stop(0.0	, #3F3F3F), color-stop(1, #777777) );
 	background:-moz-linear-gradient( center top, #373737 5%, #4F4F4F 100% );*/

htdocs/index.html

@@ -164,7 +164,7 @@
                 <div class="openwebrx-panel-line">
                     <div title="Mute on/off" id="openwebrx-mute-off" class="openwebrx-button" onclick="toggleMute();"><span class="sprite sprite-speaker openwebrx-sliderbtn-img"></span></div>
                     <input title="Volume" id="openwebrx-panel-volume" class="openwebrx-panel-slider" type="range" min="0" max="150" value="50" step="1" onchange="updateVolume()" oninput="updateVolume()">
-                    <div title="Auto-adjust waterfall colors" id="openwebrx-waterfall-colors-auto" class="openwebrx-button" onclick="waterfall_measure_minmax_now=true;"><span class="sprite sprite-waterfall-auto openwebrx-sliderbtn-img"></span></div>
+                    <div title="Auto-adjust waterfall colors (right-click for continuous)" id="openwebrx-waterfall-colors-auto" class="openwebrx-button"><span class="sprite sprite-waterfall-auto openwebrx-sliderbtn-img"></span></div>
                     <input title="Waterfall minimum level" id="openwebrx-waterfall-color-min" class="openwebrx-panel-slider" type="range" min="-200" max="100" value="50" step="1" onchange="updateWaterfallColors(0);" oninput="updateVolume()">
                 </div>
                 <div class="openwebrx-panel-line">

htdocs/openwebrx.js

@@ -101,6 +101,7 @@ function waterfallColorsDefault() {
     waterfall_max_level = waterfall_max_level_default;
     $("#openwebrx-waterfall-color-min").val(waterfall_min_level);
     $("#openwebrx-waterfall-color-max").val(waterfall_max_level);
+    waterfallColorsContinuousReset();
 }
 
 function waterfallColorsAuto(levels) {
@@ -109,7 +110,32 @@ function waterfallColorsAuto(levels) {
     var max_level = levels.max + waterfall_auto_level_margin.max;
     max_level = Math.max(min_level + (waterfall_auto_level_margin.min_range || 0), max_level);
     $("#openwebrx-waterfall-color-max").val(max_level);
-    updateWaterfallColors(0);
+    waterfall_min_level = min_level;
+    waterfall_max_level = max_level;
+}
+
+var waterfall_continuous = {
+    min: -150,
+    max: 0
+};
+
+function waterfallColorsContinuousReset() {
+    waterfall_continuous.min = waterfall_min_level;
+    waterfall_continuous.max = waterfall_max_level;
+}
+
+function waterfallColorsContinuous(levels) {
+    if (levels.max > waterfall_continuous.max + 1) {
+        waterfall_continuous.max += 1;
+    } else if (levels.max < waterfall_continuous.max - 1) {
+        waterfall_continuous.max -= .1;
+    }
+    if (levels.min < waterfall_continuous.min - 1) {
+        waterfall_continuous.min -= 1;
+    } else if (levels.min > waterfall_continuous.min + 1) {
+        waterfall_continuous.min += .1;
+    }
+    waterfallColorsAuto(waterfall_continuous);
 }
 
 function setSmeterRelativeValue(value) {
@@ -1050,6 +1076,7 @@ function clear_metadata() {
 }
 
 var waterfall_measure_minmax_now = false;
+var waterfall_measure_minmax_continuous = false;
 
 function waterfall_measure_minmax_do(what) {
     // this is based on an oversampling factor of about 1,25
@@ -1267,6 +1294,12 @@ function waterfall_add(data) {
         var levels = waterfall_measure_minmax_do(data);
         waterfall_measure_minmax_now = false;
         waterfallColorsAuto(levels);
+        waterfallColorsContinuousReset();
+    }
+
+    if (waterfall_measure_minmax_continuous) {
+        var level = waterfall_measure_minmax_do(data);
+        waterfallColorsContinuous(level);
     }
 
     //Add line to waterfall image
@@ -1358,6 +1391,16 @@ function initSliders() {
         $slider.val(val + step);
         $slider.trigger('change');
     });
+
+    var waterfallAutoButton = $('#openwebrx-waterfall-colors-auto');
+    waterfallAutoButton.on('click', function(ev) {
+        waterfall_measure_minmax_now=true;
+    }).on('contextmenu', function(){
+        waterfall_measure_minmax_continuous = !waterfall_measure_minmax_continuous;
+        waterfallColorsContinuousReset();
+        waterfallAutoButton[(waterfall_measure_minmax_continuous ? 'add' : 'remove') + 'Class']('highlighted')
+        return false;
+    });
 }
 
 function digimodes_init() {