Merge pull request #57 from ccpandhare/modules

Added segmented-colormap Module

dist/image-sequencer.js

@@ -35032,10 +35032,11 @@ module.exports = {
   'ndvi-red': require('./modules/NdviRed'),
   'do-nothing-pix': require('./modules/DoNothingPix'),
   'invert': require('./modules/Invert'),
-  'crop': require('./modules/Crop')
+  'crop': require('./modules/Crop'),
+  'segmented-colormap': require('./modules/SegmentedColormap')
 }
 
-},{"./modules/Crop":122,"./modules/DoNothing":123,"./modules/DoNothingPix":124,"./modules/GreenChannel":125,"./modules/Invert":126,"./modules/NdviRed":127}],120:[function(require,module,exports){
+},{"./modules/Crop":122,"./modules/DoNothing":123,"./modules/DoNothingPix":124,"./modules/GreenChannel":125,"./modules/Invert":126,"./modules/NdviRed":127,"./modules/SegmentedColormap":129}],120:[function(require,module,exports){
 function ReplaceImage(ref,selector,steps,options) {
   if(!ref.options.inBrowser) return false; // This isn't for Node.js
   this_ = ref;
@@ -35212,11 +35213,10 @@ module.exports = function DoNothing(options) {
 /*
  * Display only the green channel
  */
-module.exports = function GreenChannel(options) {
+module.exports = function DoNothingPix(options) {
 
   options = options || {};
-  options.title = "Green channel only";
+  options.title = "Do Nothing with pixels";
-  options.description = "Displays only the green channel of an image";
   var output;
 
   //function setup() {} // optional
@@ -35419,4 +35419,82 @@ module.exports = function PixelManipulation(image, options) {
 
 }
 
-},{"base64-stream":3,"get-pixels":27,"save-pixels":104}]},{},[116]);
+},{"base64-stream":3,"get-pixels":27,"save-pixels":104}],129:[function(require,module,exports){
+module.exports = function SegmentedColormap(options) {
+
+  options = options || {};
+  options.title = "Segmented Colormap";
+  options.colormap = options.colormap || "default";
+  var output;
+
+  function draw(input,callback) {
+    this_ = this;
+    function changePixel(r, g, b, a) {
+      var ndvi = (b - r) / (r + b);
+      var normalized = (ndvi + 1) / 2;
+      var res = colormaps[options.colormap](normalized);
+      return [res[0], res[1], res[2], 255];
+    }
+    function output(image,datauri,mimetype){
+      this_.output = {src:datauri,format:mimetype}
+    }
+    return require('./PixelManipulation.js')(input, {
+      output: output,
+      changePixel: changePixel,
+      format: input.format,
+      image: options.image,
+      callback: callback
+    });
+  }
+
+  return {
+    options: options,
+    draw: draw,
+    output: output
+  }
+}
+
+var greyscale_colormap = segmented_colormap([[0, [0, 0, 0], [255, 255, 255]], [1, [255, 255, 255], [255, 255, 255]]]);
+
+var default_colormap = segmented_colormap([[0, [0, 0, 255], [38, 195, 195]], [0.5, [0, 150, 0], [255, 255, 0]], [0.75, [255, 255, 0], [255, 50, 50]]]);
+
+var stretched_colormap = segmented_colormap([[0, [0, 0, 255], [0, 0, 255]], [0.1, [0, 0, 255], [38, 195, 195]], [0.5, [0, 150, 0], [255, 255, 0]], [0.7, [255, 255, 0], [255, 50, 50]], [0.9, [255, 50, 50], [255, 50, 50]]]);
+
+var fastie_colormap = segmented_colormap([[0, [255, 255, 255], [0, 0, 0]], [0.167, [0, 0, 0], [255, 255, 255]], [0.33, [255, 255, 255], [0, 0, 0]], [0.5, [0, 0, 0], [140, 140, 255]], [0.55, [140, 140, 255], [0, 255, 0]], [0.63, [0, 255, 0], [255, 255, 0]], [0.75, [255, 255, 0], [255, 0, 0]], [0.95, [255, 0, 0], [255, 0, 255]]]);
+
+var colormaps = {
+  greyscale: greyscale_colormap,
+  default: default_colormap,
+  stretched: stretched_colormap,
+  fastie: fastie_colormap
+}
+
+function segmented_colormap(segments) {
+  return function(x) {
+    var i, result, x0, x1, xstart, y0, y1, _i, _j, _len, _ref, _ref1, _ref2, _ref3;
+    _ref = [0, 0], y0 = _ref[0], y1 = _ref[1];
+    _ref1 = [segments[0][0], 1], x0 = _ref1[0], x1 = _ref1[1];
+    if (x < x0) {
+      return y0;
+    }
+    for (i = _i = 0, _len = segments.length; _i < _len; i = ++_i) {
+      _ref2 = segments[i], xstart = _ref2[0], y0 = _ref2[1], y1 = _ref2[2];
+      x0 = xstart;
+      if (i === segments.length - 1) {
+        x1 = 1;
+        break;
+      }
+      x1 = segments[i + 1][0];
+      if ((xstart <= x && x < x1)) {
+        break;
+      }
+    }
+    result = [];
+    for (i = _j = 0, _ref3 = y0.length; 0 <= _ref3 ? _j < _ref3 : _j > _ref3; i = 0 <= _ref3 ? ++_j : --_j) {
+      result[i] = (x - x0) / (x1 - x0) * (y1[i] - y0[i]) + y0[i];
+    }
+    return result;
+  };
+};
+
+},{"./PixelManipulation.js":128}]},{},[116]);

src/Modules.js

@@ -7,5 +7,6 @@ module.exports = {
   'ndvi-red': require('./modules/NdviRed'),
   'do-nothing-pix': require('./modules/DoNothingPix'),
   'invert': require('./modules/Invert'),
-  'crop': require('./modules/Crop')
+  'crop': require('./modules/Crop'),
+  'segmented-colormap': require('./modules/SegmentedColormap')
 }

src/modules/DoNothingPix.js

@@ -1,11 +1,10 @@
 /*
- * Display only the green channel
+ * This module extracts pixels and saves them as it is.
  */
-module.exports = function GreenChannel(options) {
+module.exports = function DoNothingPix(options) {
 
   options = options || {};
-  options.title = "Green channel only";
+  options.title = "Do Nothing with pixels";
-  options.description = "Displays only the green channel of an image";
   var output;
 
   //function setup() {} // optional

src/modules/SegmentedColormap.js

@@ -0,0 +1,79 @@
+module.exports = function SegmentedColormap(options) {
+
+  options = options || {};
+  options.title = "Segmented Colormap";
+  options.colormap = options.colormap || "default";
+  if(typeof(options.colormap) == "object")
+    options.colormap = segmented_colormap(options.colormap);
+  else options.colormap = colormaps[options.colormap];
+  var output;
+
+  function draw(input,callback) {
+    this_ = this;
+    function changePixel(r, g, b, a) {
+      var ndvi = (b - r) / (r + b);
+      var normalized = (ndvi + 1) / 2;
+      var res = options.colormap(normalized);
+      return [res[0], res[1], res[2], 255];
+    }
+    function output(image,datauri,mimetype){
+      this_.output = {src:datauri,format:mimetype}
+    }
+    return require('./PixelManipulation.js')(input, {
+      output: output,
+      changePixel: changePixel,
+      format: input.format,
+      image: options.image,
+      callback: callback
+    });
+  }
+
+  return {
+    options: options,
+    draw: draw,
+    output: output
+  }
+}
+
+var greyscale_colormap = segmented_colormap([[0, [0, 0, 0], [255, 255, 255]], [1, [255, 255, 255], [255, 255, 255]]]);
+
+var default_colormap = segmented_colormap([[0, [0, 0, 255], [38, 195, 195]], [0.5, [0, 150, 0], [255, 255, 0]], [0.75, [255, 255, 0], [255, 50, 50]]]);
+
+var stretched_colormap = segmented_colormap([[0, [0, 0, 255], [0, 0, 255]], [0.1, [0, 0, 255], [38, 195, 195]], [0.5, [0, 150, 0], [255, 255, 0]], [0.7, [255, 255, 0], [255, 50, 50]], [0.9, [255, 50, 50], [255, 50, 50]]]);
+
+var fastie_colormap = segmented_colormap([[0, [255, 255, 255], [0, 0, 0]], [0.167, [0, 0, 0], [255, 255, 255]], [0.33, [255, 255, 255], [0, 0, 0]], [0.5, [0, 0, 0], [140, 140, 255]], [0.55, [140, 140, 255], [0, 255, 0]], [0.63, [0, 255, 0], [255, 255, 0]], [0.75, [255, 255, 0], [255, 0, 0]], [0.95, [255, 0, 0], [255, 0, 255]]]);
+
+var colormaps = {
+  greyscale: greyscale_colormap,
+  default: default_colormap,
+  stretched: stretched_colormap,
+  fastie: fastie_colormap
+}
+
+function segmented_colormap(segments) {
+  return function(x) {
+    var i, result, x0, x1, xstart, y0, y1, _i, _j, _len, _ref, _ref1, _ref2, _ref3;
+    _ref = [0, 0], y0 = _ref[0], y1 = _ref[1];
+    _ref1 = [segments[0][0], 1], x0 = _ref1[0], x1 = _ref1[1];
+    if (x < x0) {
+      return y0;
+    }
+    for (i = _i = 0, _len = segments.length; _i < _len; i = ++_i) {
+      _ref2 = segments[i], xstart = _ref2[0], y0 = _ref2[1], y1 = _ref2[2];
+      x0 = xstart;
+      if (i === segments.length - 1) {
+        x1 = 1;
+        break;
+      }
+      x1 = segments[i + 1][0];
+      if ((xstart <= x && x < x1)) {
+        break;
+      }
+    }
+    result = [];
+    for (i = _j = 0, _ref3 = y0.length; 0 <= _ref3 ? _j < _ref3 : _j > _ref3; i = 0 <= _ref3 ? ++_j : --_j) {
+      result[i] = (x - x0) / (x1 - x0) * (y1[i] - y0[i]) + y0[i];
+    }
+    return result;
+  };
+};