projects / dygraphs.git / blame
| Commit | Line | Data |
|---|---|---|
| 54425b14 | 1 | <!DOCTYPE html> |
| 15b00ba8 JB |
2 | <html> |
| 3 | <head> | |
| fd6b8dad | 4 | <link rel="stylesheet" href="../dist/dygraph.css"> |
| 15b00ba8 | 5 | <title>Test of number formatting</title> |
| fbd6834a | 6 | <script type="text/javascript" src="../dist/dygraph.js"></script> |
| 7e5ddc94 | 7 | |
| 15b00ba8 JB |
8 | </head> |
| 9 | <body> | |
| 10 | <p>The default formatting mimicks printf with %.<i>p</i>g where <i>p</i> is | |
| 11 | the precision to use. It turns out that JavaScript's toPrecision() | |
| 12 | method is almost but not exactly equal to %g; they differ for values | |
| 13 | with small absolute values (10^-1 to 10^-5 or so), with toPrecision() | |
| 14 | yielding strings that are longer than they should be (i.e. using fixed | |
| 15 | point where %g would use exponential).</p> | |
| 16 | ||
| 17 | <p>This test is intended to check that our formatting works properly for a | |
| 18 | variety of precisions.</p> | |
| 19 | ||
| 20 | <p>Precision to use (1 to 21): | |
| 21 | <input type="text" id="p_input" size="20" onchange="updateTable();"></p> | |
| 22 | <br> | |
| 23 | <br> | |
| 24 | <div id="content" style="font-family:'Courier New',monospace"></div> | |
| 25 | ||
| 26 | <script type="text/javascript"> | |
| 27 | // Helper functions for generating an HTML table for holding the test | |
| 28 | // results. | |
| 29 | createRow = function(columnType, columns) { | |
| 30 | var row = document.createElement('tr'); | |
| 31 | for (var i = 0; i < columns.length; i ++) { | |
| 32 | var th = document.createElement(columnType); | |
| 33 | var text = document.createTextNode(columns[i]); | |
| 34 | th.appendChild(text); | |
| 35 | row.appendChild(th); | |
| 36 | }; | |
| 37 | return row; | |
| 38 | }; | |
| 39 | ||
| 40 | createHeaderRow = function(columns) { | |
| 41 | return createRow('th', columns); | |
| 42 | }; | |
| 43 | ||
| 44 | createDataRow = function(columns) { | |
| 45 | return createRow('td', columns); | |
| 46 | }; | |
| 47 | ||
| 48 | createTable = function(headerColumns, dataColumnsList) { | |
| 49 | var table = document.createElement('table'); | |
| 50 | table.appendChild(createHeaderRow(headerColumns)); | |
| 51 | for (var i = 0; i < dataColumnsList.length; i++) { | |
| 52 | table.appendChild(createDataRow(dataColumnsList[i])); | |
| 53 | } | |
| 54 | return table; | |
| 55 | }; | |
| 56 | ||
| 57 | updateTable = function() { | |
| 7201b11e JB |
58 | var headers = ['Dygraph.floatFormat()', 'toPrecision()', |
| 59 | 'Dygraph.floatFormat()', 'toPrecision()']; | |
| 15b00ba8 JB |
60 | var numbers = []; |
| 61 | var p = parseInt(document.getElementById('p_input').value); | |
| 62 | ||
| 63 | for (var i = -10; i <= 10; i++) { | |
| 64 | var n = Math.pow(10, i); | |
| 7201b11e | 65 | numbers.push([Dygraph.floatFormat(n, p), |
| 15b00ba8 | 66 | n.toPrecision(p), |
| 7201b11e | 67 | Dygraph.floatFormat(Math.PI * n, p), |
| 15b00ba8 JB |
68 | (Math.PI * n).toPrecision(p)]); |
| 69 | } | |
| 70 | ||
| 71 | // Check exact values of 0. | |
| 7201b11e | 72 | numbers.push([Dygraph.floatFormat(0.0, p), |
| 15b00ba8 JB |
73 | 0.0.toPrecision(p)]); |
| 74 | ||
| 75 | var elem = document.getElementById('content'); | |
| 76 | elem.innerHTML = ''; | |
| 77 | elem.appendChild(createTable(headers, numbers)); | |
| 78 | }; | |
| 79 | ||
| 80 | document.getElementById('p_input').value = '4'; | |
| 81 | updateTable(); | |
| 82 | </script> | |
| 83 | </body> | |
| 84 | </html> |