projects / dygraphs.git / blame
| Commit | Line | Data |
|---|---|---|
| 54425b14 | 1 | <!DOCTYPE html> |
| 15b00ba8 JB |
2 | <html> |
| 3 | <head> | |
| 4 | <title>Test of number formatting</title> | |
| 7e5ddc94 DV |
5 | <!-- |
| 6 | For production (minified) code, use: | |
| 7 | <script type="text/javascript" src="dygraph-combined.js"></script> | |
| 8 | --> | |
| 9 | <script type="text/javascript" src="../dygraph-dev.js"></script> | |
| 10 | ||
| 15b00ba8 JB |
11 | </head> |
| 12 | <body> | |
| 13 | <p>The default formatting mimicks printf with %.<i>p</i>g where <i>p</i> is | |
| 14 | the precision to use. It turns out that JavaScript's toPrecision() | |
| 15 | method is almost but not exactly equal to %g; they differ for values | |
| 16 | with small absolute values (10^-1 to 10^-5 or so), with toPrecision() | |
| 17 | yielding strings that are longer than they should be (i.e. using fixed | |
| 18 | point where %g would use exponential).</p> | |
| 19 | ||
| 20 | <p>This test is intended to check that our formatting works properly for a | |
| 21 | variety of precisions.</p> | |
| 22 | ||
| 23 | <p>Precision to use (1 to 21): | |
| 24 | <input type="text" id="p_input" size="20" onchange="updateTable();"></p> | |
| 25 | <br> | |
| 26 | <br> | |
| 27 | <div id="content" style="font-family:'Courier New',monospace"></div> | |
| 28 | ||
| 29 | <script type="text/javascript"> | |
| 30 | // Helper functions for generating an HTML table for holding the test | |
| 31 | // results. | |
| 32 | createRow = function(columnType, columns) { | |
| 33 | var row = document.createElement('tr'); | |
| 34 | for (var i = 0; i < columns.length; i ++) { | |
| 35 | var th = document.createElement(columnType); | |
| 36 | var text = document.createTextNode(columns[i]); | |
| 37 | th.appendChild(text); | |
| 38 | row.appendChild(th); | |
| 39 | }; | |
| 40 | return row; | |
| 41 | }; | |
| 42 | ||
| 43 | createHeaderRow = function(columns) { | |
| 44 | return createRow('th', columns); | |
| 45 | }; | |
| 46 | ||
| 47 | createDataRow = function(columns) { | |
| 48 | return createRow('td', columns); | |
| 49 | }; | |
| 50 | ||
| 51 | createTable = function(headerColumns, dataColumnsList) { | |
| 52 | var table = document.createElement('table'); | |
| 53 | table.appendChild(createHeaderRow(headerColumns)); | |
| 54 | for (var i = 0; i < dataColumnsList.length; i++) { | |
| 55 | table.appendChild(createDataRow(dataColumnsList[i])); | |
| 56 | } | |
| 57 | return table; | |
| 58 | }; | |
| 59 | ||
| 60 | updateTable = function() { | |
| 7201b11e JB |
61 | var headers = ['Dygraph.floatFormat()', 'toPrecision()', |
| 62 | 'Dygraph.floatFormat()', 'toPrecision()']; | |
| 15b00ba8 JB |
63 | var numbers = []; |
| 64 | var p = parseInt(document.getElementById('p_input').value); | |
| 65 | ||
| 66 | for (var i = -10; i <= 10; i++) { | |
| 67 | var n = Math.pow(10, i); | |
| 7201b11e | 68 | numbers.push([Dygraph.floatFormat(n, p), |
| 15b00ba8 | 69 | n.toPrecision(p), |
| 7201b11e | 70 | Dygraph.floatFormat(Math.PI * n, p), |
| 15b00ba8 JB |
71 | (Math.PI * n).toPrecision(p)]); |
| 72 | } | |
| 73 | ||
| 74 | // Check exact values of 0. | |
| 7201b11e | 75 | numbers.push([Dygraph.floatFormat(0.0, p), |
| 15b00ba8 JB |
76 | 0.0.toPrecision(p)]); |
| 77 | ||
| 78 | var elem = document.getElementById('content'); | |
| 79 | elem.innerHTML = ''; | |
| 80 | elem.appendChild(createTable(headers, numbers)); | |
| 81 | }; | |
| 82 | ||
| 83 | document.getElementById('p_input').value = '4'; | |
| 84 | updateTable(); | |
| 85 | </script> | |
| 86 | </body> | |
| 87 | </html> |