// Numbas version: exam_results_page_options
{"name": "Plot Graph", "extensions": ["jsxgraph"], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"ungrouped_variables": ["selector", "vsh", "hsh", "vsc", "hsc", "yo", "yn", "xo", "xn", "yo0", "yo1", "yo2", "yo3", "yo4", "maxx", "maxy"], "preamble": {"css": "table#values th {\n  background: none;\n  text-align: center;\n}", "js": "function dragpoint_board() {\nvar scope = question.scope;\n  \n // var a = scope.variables.a.value;\n//  var c = scope.variables.c.value;\n\n  var yo0 = scope.variables.yo0.value;\n  var yo1 = scope.variables.yo1.value;\n  var yo2 = scope.variables.yo2.value;\n  var yo3 = scope.variables.yo3.value;  \n  var yo4 = scope.variables.yo4.value;\n    \n  var maxx = scope.variables.maxx.value;\n  var maxy = scope.variables.maxy.value;\n  \n  var div = Numbas.extensions.jsxgraph.makeBoard('500px','500px',{boundingBox:[-maxx,maxy,maxx,-maxy],grid:true});\n  $(question.display.html).find('#dragpoint').append(div);\n  \n  var board = div.board;\n  \n  \n   //create stationary points\n    \n  var op0 = board.create('point',[1,yo0],{name:'Janaury',fixed:true,size:2,color:'black'});\n    var op1 = board.create('point',[2,yo1],{name:'February',fixed:true,size:2,color:'black'});\n    var op2 = board.create('point',[3,yo2],{name:'March',fixed:true,size:2,color:'black'});\n    var op3 = board.create('point',[4,yo3],{name:'April',fixed:true,size:2,color:'black'});\n    var op4 = board.create('point',[5,yo4],{name:'May',fixed:true,size:2,color:'black'});\n    \n    \n    //create draggable points\n    //why are there are a cloine under each one?\n    var np0 = board.create('point',[1,yo0],{name:'January',size:2,snapSizeX: 0.25,snapSizeY: 0.25,snapToGrid: true});\n    //var np1 = board.create('point',[2,yo1],{name:'February',size:2,snapSizeX: 0.25,snapSizeY: 0.25,snapToGrid: true});\n    //var np2 = board.create('point',[3,yo2],{name:'March',size:2,snapSizeX: 0.25,snapSizeY: 0.25,snapToGrid: true});\n    //var np3 = board.create('point',[4,yo3],{name:'April',size:2,snapSizeX: 0.25,snapSizeY: 0.25,snapToGrid: true});\n    //var np4 = board.create('point',[5,yo4],{name:'May',size:2,snapSizeX: 0.25,snapSizeY: 0.25,snapToGrid: true});\n  \n  \n    \n  \n  //shorthand to evaluate a mathematical expression to a number\n  //function evaluate(expression) {\n   // try {\n   //   var val = Numbas.jme.evaluate(expression,question.scope);\n  //    return Numbas.jme.unwrapValue(val);\n  //  }\n  //  catch(e) {\n      // if there's an error, return no number\n   //   return NaN;\n  //  }\n // }\n  \n  // set up points array\n  //var num_points = 5;\n  //var points = [np0, np1, np2, np3, np4];\n  \n  \n  // this function sets up the i^th point\n//  function make_point(i) {\n    \n    // calculate initial coordinates\n  //  var x = i-(num_points-1)/2;\n    \n    // create an invisible vertical line for the point to slide along\n   // var line = board.create('line',[[x,0],[x,1]],{visible: false});\n    \n    // create the point\n  //  var point = points[i] = board.create(\n   //   'point',\n   //   [i-(num_points-1)/2,0],\n   //   {\n    //    name:'',\n   //     size:2,\n    //    snapSizeY: 0.25,  // the point will snap to y-coordinates which are multiples of 0.1\n    //    snapSizeX: 0.25,\n   //     snapToGrid: true\n    //  }\n   // );\n    \n  // var point = points[i];\n    \n //   var x=point[0];\n  //  var y=point[1];\n    \n    // the contents of the input box for this point\n //   var xstudentAnswer = question.parts[0].gaps[2*i].display.studentAnswer;\n  //  var ystudentAnswer = question.parts[0].gaps[2*i+1].display.studentAnswer;\n    \n    // watch the student's input and reposition the point when it changes.    \n  //  ko.computed(function() {\n  //    x = evaluate(xstudentAnswer());\n  //    y = evaluate(ystudentAnswer());\n  //    if(!(isNaN(x)) && !(isNaN(y)) && board.mode!=board.BOARD_MODE_DRAG) {\n  //      point.moveTo([x,y],100);\n //     }\n //   });\n    \n    // when the student drags the point, update the gapfill input\n  //  point.on('drag',function(){\n  //    var x = Numbas.math.niceNumber(point.X());\n  //    var y = Numbas.math.niceNumber(point.Y());\n  //    xstudentAnswer(x);\n  //    ystudentAnswer(y);\n  //  });\n    \n  }\n  \n  // create each point\n // for(var i=0;i<num_points;i++) {\n //   make_point(i);\n // }\n  \n  // create the parabola\n//  var parabool = board.create('spline',[np0, np1, np2, np3, np4],{strokeWidth:3,strokeColor:'red'});\n//  var statparabool = board.create('spline',[op0, op1, op2, op3, op4],{strokeWidth:3,strokeColor:'black'});\n\n//}\n\n//question.signals.on('HTMLAttached',function() {\n // dragpoint_board();\n}); "}, "name": "Plot Graph", "tags": [], "variables": {"selector": {"definition": "'vsc'", "templateType": "anything", "group": "Ungrouped variables", "description": "", "name": "selector"}, "maxx": {"definition": "max(map(abs(a),a,xn)+5)+1", "templateType": "anything", "group": "Ungrouped variables", "description": "", "name": "maxx"}, "yo1": {"definition": "random(5..12#0.1 except yo0)", "templateType": "anything", "group": "Ungrouped variables", "description": "", "name": "yo1"}, "yo2": {"definition": "random(5..12#0.1 except yo0 except yo1)", "templateType": "anything", "group": "Ungrouped variables", "description": "", "name": "yo2"}, "yn": {"definition": "map(vsc*y+vsh,y,yo)", "templateType": "anything", "group": "Ungrouped variables", "description": "<p>new y values after the transformation</p>", "name": "yn"}, "maxy": {"definition": "12", "templateType": "anything", "group": "Ungrouped variables", "description": "", "name": "maxy"}, "yo0": {"definition": "random(5..12#0.1)", "templateType": "anything", "group": "Ungrouped variables", "description": "", "name": "yo0"}, "xn": {"definition": "map((x-hsh)/hsc,x,xo)", "templateType": "anything", "group": "Ungrouped variables", "description": "<p>new transformed x values</p>", "name": "xn"}, "hsc": {"definition": "if(selector='hsc',random(-2,-1,-0.5,0.5,2),1)", "templateType": "anything", "group": "Ungrouped variables", "description": "", "name": "hsc"}, "yo": {"definition": "repeat(random(-5..5),5)", "templateType": "anything", "group": "Ungrouped variables", "description": "<p>the (random) original y values which relate to the x values</p>", "name": "yo"}, "hsh": {"definition": "if(selector='hsh',random(-3..3 except 0),0)", "templateType": "anything", "group": "Ungrouped variables", "description": "<p>horizontal shift</p>", "name": "hsh"}, "yo3": {"definition": "random(5..12#0.1 except yo0 except yo1 except yo2)", "templateType": "anything", "group": "Ungrouped variables", "description": "", "name": "yo3"}, "vsc": {"definition": "if(selector='vsc',random(-2,-1,-0.5,0.5,2),1)", "templateType": "anything", "group": "Ungrouped variables", "description": "", "name": "vsc"}, "xo": {"definition": "list(-2..2)", "templateType": "anything", "group": "Ungrouped variables", "description": "<p>original x values</p>", "name": "xo"}, "yo4": {"definition": "random(5..12#0.1 except yo0 except yo1 except yo2 except yo3)", "templateType": "anything", "group": "Ungrouped variables", "description": "", "name": "yo4"}, "vsh": {"definition": "if(selector='vsh',random(-3..3#0.5 except 0),0)\n", "templateType": "anything", "group": "Ungrouped variables", "description": "<p>vertical shift</p>", "name": "vsh"}}, "statement": "", "advice": "", "rulesets": {"std": ["all", "fractionNumbers"]}, "extensions": ["jsxgraph"], "parts": [], "variablesTest": {"maxRuns": 100, "condition": ""}, "metadata": {"licence": "Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International", "description": "<p>of a random cubic spline</p>"}, "variable_groups": [], "functions": {}, "type": "question", "contributors": [{"name": "Gareth Woods", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/978/"}]}]}], "contributors": [{"name": "Gareth Woods", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/978/"}]}