add sky transmission vector

js/speccy.js

@@ -43,6 +43,8 @@ var fluxerrArray= [];
 var skyArray    = [];
 var modelArray  = [];
 var residualArray  = [];
+var skyTransLambdaArray  = [];
+var skyTransFluxArray  = [];
 var smoothedArray = [];
 var smoothedresidualArray = [];
 var templatelambdaArray = [];
@@ -214,6 +216,7 @@ function startUpTasks()
 	readSpecFile();   //the get is asynchronous, so don't put anything after this that depends on the read
 	changeTemplate();
     }
+    readSkyTrans();
 }
 
 
@@ -546,7 +549,22 @@ function changeTemplate() {
 
 }
 
-
+function readSkyTrans() {
+    var	templateURL = "templates/eso_skycalc_transmission_R3000.txt"; 
+    //read in the file
+    var jQResult = jQuery.get(templateURL, function(data) {
+	var lines = [];
+	lines = data.split("\n");
+	//file format: lambda(A),flux
+	var templateLength = 0;
+	for(var i=0;i<lines.length;i++) {
+	    var data = [];
+	    data  = lines[i].split(",");
+	    skyTransLambdaArray[i] = Number(data[0]);
+	    skyTransFluxArray[i]   = Number(data[1]);
+	};
+    })
+}
 
 function plotData() {
     ctx.canvas.width  = Math.max(1000, window.innerWidth * 0.96);
@@ -854,6 +872,27 @@ function plotData() {
 	ctx.stroke();
 	ctx.closePath();
     }
+    
+    //draw the sky transmission curve
+    if ( document.getElementById("ToggleTrans").checked )
+    {
+        var skytransmult = Math.max(0.0,y0) + 0.5*(y1 -Math.max(0,y0));
+        
+	ctx.strokeStyle = "#0000aa";
+	ctx.beginPath();
+	for(var i=0;i<skyTransLambdaArray.length;i++){
+	    var x = padx1 + (skyTransLambdaArray[i]-x0)*dx_inv;
+	    if ( x >= padx1 && x <= xsize-padx2 ) 
+	    { 
+		var y = ysize - pady - (skyTransFluxArray[i]*skytransmult-y0)*dy_inv;
+		var clip_y = Math.max(Math.min(y,ysize-pady),pady);
+		if ( i>=1) { ctx.lineTo(x,clip_y);}
+		else       { ctx.moveTo(x,clip_y);}
+	    }
+	}
+	ctx.stroke();
+	ctx.closePath();
+    }
 
     //draw the model curve
     if ( document.getElementById("ToggleModel").checked )

speccy.html

@@ -242,7 +242,9 @@
 		<span style="color: #008800;">Lines</span></label>
 	    <label><input type="checkbox" onclick="plotData();" value="ToggleSky"   id="ToggleSky" >
 		<span style="color: #00dddd;">Sky</span>&nbsp;&#215;</label>
-	    <input id="skyMult" type="text" value="0.05" onchange="plotData();" size="5" title="Sky flux multiplier">
+	    <input id="skyMult" type="text" value="0.05" onchange="plotData();" size="5" width="6" title="Sky flux multiplier">
+	    <label><input type="checkbox" onclick="plotData();" value="ToggleTrans" id="ToggleTrans" title="Show a generic model of the sky transmission vector (ESO skycalc, AM=1.3, Paranal)">
+		<span style="color: #0000aa;">Sky Trans.</span></label>
 	</td>
     </tr>