Riemann sum II

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var brd = JXG.JSXGraph.initBoard('jxgbox', {originX: 400, originY: 200, grid:true, unitX: 50, unitY: 50}); brd.createElement('axis', [[0,0], [1,0]], {strokeColor:'black'}); brd.createElement('axis', [[0,0], [0,1]], {strokeColor:'black'}); var b = brd.createElement('slider',[[1,3.5],[5,3.5],[0,1,3]],{name:'a', strokeColor:'black', fillColor:'white'}); var f = function(x){ return b.Value()*Math.sin(x); } var plot = brd.createElement('functiongraph',[f,-7,7], {strokeColor:'#32CD32', strokeWidth:'4px'}); var g = brd.D(f); var plot2 = brd.createElement('functiongraph',[g,-7,7], {strokeColor:'#9370DB', strokeWidth:'2px'}); var os = brd.createElement('riemannsum',[f, 35, 'middle', -7, 7], {fillColor:'#B22222', fillOpacity:0.3, strokeColor:'#8B1A1A', strokeWidth:'2px'}); var t1 = brd.createElement('text',[-7,2,"(a*sin(x))'"],{strokeColor:'#9370DB'}); var t2 = brd.createElement('text',[-7,-1.5,"a*sin(x)"],{strokeColor:'#32CD32'}); ===The underlying JavaScript code=== var brd = JXG.JSXGraph.initBoard('jxgbox', {originX: 400, originY: 200, grid:true, unitX: 50, unitY: 50}); brd.createElement('axis', [[0,0], [1,0]], {strokeColor:'black'}); brd.createElement('axis', [[0,0], [0,1]], {strokeColor:'black'}); var b = brd.createElement('slider',[[1,3.5],[5,3.5],[0,1,3]],{name:'a', strokeColor:'black', fillColor:'white'}); var f = function(x){ return b.Value()*Math.sin(x); } var plot = brd.createElement('functiongraph',[f,-7,7], {strokeColor:'#32CD32', strokeWidth:'4px'}); var g = brd.D(f); var plot2 = brd.createElement('functiongraph',[g,-7,7], {strokeColor:'#9370DB', strokeWidth:'2px'}); var os = brd.createElement('riemannsum',[f, 35, 'middle', -7, 7], {fillColor:'#B22222', fillOpacity:0.3, strokeColor:'#8B1A1A', strokeWidth:'2px'}); var t1 = brd.createElement('text',[-7,2,"(a*sin(x))'"],{strokeColor:'#9370DB'}); var t2 = brd.createElement('text',[-7,-1.5,"a*sin(x)"],{strokeColor:'#32CD32'});