update work flow

CwJ/integrals/area.jmd

@@ -1430,11 +1430,49 @@ The area under a curve approximated by a Riemann sum.
 # url = "riemann.js"
 #CalculusWithJulia.WeaveSupport.JSXGraph(:integrals, url, caption)
 # This is just wrong...
-url = "https://raw.githubusercontent.com/jverzani/CalculusWithJulia.jl/master/CwJ/integrals/riemann.js"
-url = "./riemann.js"
-CalculusWithJulia.WeaveSupport.JSXGraph(url, caption)
+#CalculusWithJulia.WeaveSupport.JSXGraph(url, caption)
+nothing
 ```
 
+```=html
+<div id="jsxgraph" style="width: 500px; height: 500px;"></div>
+```
+
+```ojs
+//| echo: false
+//| output: false
+JXG = require("jsxgraph");
+
+b = JXG.JSXGraph.initBoard('jsxgraph', {
+    boundingbox: [-0.5,0.3,1.5,-1/4], axis:true
+});
+
+g = function(x) { return x*x*x*x +  10*x*x - 60* x + 100}
+f = function(x) {return 1/Math.sqrt(g(x))};
+
+type = "right";
+l = 0;
+r = 1;
+rsum = function() {
+    return JXG.Math.Numerics.riemannsum(f,n.Value(), type, l, r);
+};
+n =   b.create('slider', [[0.1, -0.05],[0.75,-0.05], [2,1,50]],{name:'n',snapWidth:1});
+
+graph = b.create('functiongraph', [f, l, r]);
+os = b.create('riemannsum',
+                  [f,
+                   function(){ return n.Value();},
+                   type, l, r
+                  ],
+                  {fillColor:'#ffff00', fillOpacity:0.3});
+
+b.create('text', [0.1,0.25, function(){
+    return 'Riemann sum='+(rsum().toFixed(4));
+}]);
+```
+
+
+
 
 The interactive graphic shows the area of a right-Riemann sum for different partitions. The function is