// Numbas version: finer_feedback_settings
{"name": "Katrin's copy of Use canvas to draw a rectangle", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"question_groups": [{"pickingStrategy": "all-ordered", "name": "", "pickQuestions": 0, "questions": []}], "variablesTest": {"maxRuns": 100, "condition": ""}, "variable_groups": [], "functions": {"rectangle": {"parameters": [["w", "number"], ["h", "number"]], "language": "javascript", "definition": "\n      var c = document.createElement('canvas');\n        $(c).attr('width',w+40).attr('height',h+40);\n        var context = c.getContext('2d');\n        \n        //fill in rectangle with a light shade\n        context.fillStyle = '#eee';\n        context.fillRect(5,5,w,h);\n        \n        //draw outline\n        context.strokeStyle = '#000';\n        context.lineWidth = 3;\n        context.strokeRect(5,5,w,h);\n        \n        //draw labels\n        context.fillStyle = '#000';\n        context.font = '20px sans-serif';\n        var wstring = w+'m';\n        var tw = context.measureText(wstring).width;\n        console.log(tw);\n        context.fillText(wstring,5+(w-tw)/2,5+h+25);\n        \n        var hstring = h+'m';\n        var hw = context.measureText(hstring).width;\n        context.save();\n        context.translate(5+w+25,5+(h+hw)/2);\n        context.rotate(-Math.PI/2);\n        context.fillText(hstring,0,0);\n        \n        return c;\n      ", "type": "html"}}, "ungrouped_variables": ["h", "w"], "parts": [{"showPrecisionHint": false, "prompt": "<p>What is the rectangle's perimeter, in metres?</p>", "maxValue": "2(w+h)", "type": "numberentry", "showCorrectAnswer": true, "minValue": "2(w+h)", "allowFractions": false, "correctAnswerFraction": false, "marks": 1, "scripts": {}}, {"showPrecisionHint": false, "prompt": "<p>What is the rectangle's area, in metres?</p>", "maxValue": "w*h", "type": "numberentry", "showCorrectAnswer": true, "minValue": "w*h", "allowFractions": false, "correctAnswerFraction": false, "marks": 1, "scripts": {}}], "type": "question", "statement": "<p>This rectangle is <strong>{w} metres</strong> wide and <strong>{h} metres</strong> long.</p>\n  <p style=\"text-align: center;\">{rectangle(w,h)}</p>", "rulesets": {}, "showQuestionGroupNames": false, "variables": {"w": {"group": "Ungrouped variables", "definition": "random(100..200#5)", "templateType": "anything", "name": "w", "description": ""}, "h": {"group": "Ungrouped variables", "definition": "random(50..100#5)", "templateType": "anything", "name": "h", "description": ""}}, "tags": ["canvas", "demo", "function", "graphic"], "name": "Katrin's copy of Use canvas to draw a rectangle", "preamble": {"js": "", "css": ""}, "advice": "", "metadata": {"licence": "Creative Commons Attribution 4.0 International", "notes": "<p>Doesn't work in IE8, because it doesn't support the canvas element.</p>", "description": "<p>The custom function <code>rectangle(width,height)</code> draws a rectangle with the given dimensions, along with some labels.</p>"}, "contributors": [{"name": "Christian Lawson-Perfect", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/7/"}, {"name": "Katrin Thomson", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/3424/"}]}]}], "contributors": [{"name": "Christian Lawson-Perfect", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/7/"}, {"name": "Katrin Thomson", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/3424/"}]}