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Plot pressure. Switch from RH to dew point to save an axis for the above.
author Daniel O'Connor <darius@dons.net.au>
date Sun, 21 Aug 2011 15:47:52 +0930
parents 24e9b717722d
children 6edb93c20971
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1 /*
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2 * Copyright 2011 Daniel O'Connor <darius@dons.net.au>
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3 *
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4 * Redistribution and use in source and binary forms, with or without modification, are
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5 * permitted provided that the following conditions are met:
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6 *
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7 * 1. Redistributions of source code must retain the above copyright notice, this list of
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8 * conditions and the following disclaimer.
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9 *
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10 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
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11 * of conditions and the following disclaimer in the documentation and/or other materials
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12 * provided with the distribution.
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13 *
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14 * THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ''AS IS'' AND ANY EXPRESS OR IMPLIED
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15 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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16 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
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17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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21 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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22 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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23 *
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24 * The views and conclusions contained in the software and documentation are those of the
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25 * authors and should not be interpreted as representing official policies, either expressed
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26 * or implied, of Daniel O'Connor.
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27 */
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28
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29 var timer = null;
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30 var datacache = null;
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31
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32 $.jQTouch({
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33 icon: 'icon.png',
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34 startupScreen: 'img/startup.png'
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35 });
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36
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37 function draw_graph() {
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38 var temp_out = [];
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39 var dewpt = [];
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40 var wavg = [];
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41 var wgust = [];
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42 var rain = [];
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43 var pressure = [];
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44 var i, mint = 5, maxt = 35;
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45 var l = datacache['idx'].length - 1;
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46 var d = new Date();
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47 var tzofs = d.getTimezoneOffset() * 60;
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48 for (i = 0; i < l; i++) {
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49 // Convert time from UTC to browser LT
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50 t = datacache['idx'][i] - tzofs;
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51 if (datacache['temp_out'] < mint)
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52 mint = datacache['temp_out']
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53 if (datacache['temp_out'] < maxt)
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54 maxt = datacache['temp_out']
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55 temp_out.push([t * 1000.0, datacache['temp_out'][i]]);
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56 if (datacache['hum_out'][i] != null && datacache['temp_out'][i] != null) {
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57 dewpt.push([t * 1000.0, hum2dp(datacache['hum_out'][i], datacache['temp_out'][i])]);
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58 }
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59 wavg.push([t * 1000.0, datacache['wind_ave'][i], wind2angle(datacache['wind_dir'][i])]);
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60 wgust.push([t * 1000.0, datacache['wind_gust'][i], wind2angle(datacache['wind_dir'][i])]);
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61 pressure.push([t * 1000.0, datacache['abs_pressure'][i]]);
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62 if (datacache['rain'][i] > 0)
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63 rain.push([t * 1000.0, datacache['rain'][i]]);
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64 }
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65 $.plot($("#graph1"), [
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66 { data : pressure, label: "Baro", yaxis : 1, points : { show : true }, lines : { show : true } },
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67 { data : temp_out, label: "Temp.", yaxis : 2, points : { show : true }, lines : { show : true } },
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68 { data : dewpt, label: "Dew point", yaxis : 2, points : { show : true }, lines : { show : true } },
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69 ],
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70 { xaxis : { mode : 'time' },
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71 legend : { backgroundOpacity : 0, position : 'nw' },
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72 yaxis : { min : 950, max : 1050, tickFormatter : baroFormatter },
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73 y2axis : { min : mint, max : maxt, tickFormatter : degCFormatter },
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74 });
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75 $.plot($("#graph2"), [
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76 { data : wavg, label: "Wind (Avg)", yaxis : 1, points : { show : true }, lines : { show : true }, direction : true },
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77 { data : wgust, label: "Wind (Gust)", yaxis : 1, points : { show : true }, lines : { show : true }, direction : true },
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78 { data : rain, label: "Rain", yaxis : 2, bars : { show : true, barWidth : 0.5 * 60 * 60 * 1000, align : "centre" } },
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79 ],
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80 { xaxis : { mode : 'time' },
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81 legend : { backgroundOpacity : 0, position : 'nw' },
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82 yaxis : { tickFormatter : spdFormatter },
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83 y2axis : { min : 0, tickFormatter : mmFormatter }
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84 });
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85 }
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86
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87 function wind2angle(dir) {
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88 var a = dir * (360.0 / 16.0);
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89 return a;
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90 }
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91
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92 // Formula from http://www.paroscientific.com/dewpoint.htm
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93 function alpha(temp, rh, a, b) {
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94 return (((a * temp) / (b + temp)) + Math.log(rh / 100.0));
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95 }
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96
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97 function hum2dp(rh, temp) {
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98 var a = 17.27;
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99 var b = 237.7;
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100 var Td = (b * alpha(temp, rh, a, b)) / (a - alpha(temp, rh, a, b));
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101 return Td;
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102 }
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103
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104 function degCFormatter(v, axis) {
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105 return v.toFixed(axis.tickDecimals) +"°C";
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106 }
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107
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108 function pctFormatter(v, axis) {
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109 return v.toFixed(axis.tickDecimals) +"%";
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110 }
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111
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112 function spdFormatter(v, axis) {
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113 return v.toFixed(axis.tickDecimals) + "kph";
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114 }
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115
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116 function mmFormatter(v, axis) {
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117 return v.toFixed(axis.tickDecimals) + "mm";
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118 }
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119
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120 function baroFormatter(v, axis) {
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121 return v.toFixed(axis.tickDecimals) + "hPa";
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122 }
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123
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124 function got_data(data, status) {
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125 if (status != "success") {
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126 $.log("Couldn't load data. status = " + status);
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127 return;
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128 }
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129
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130 datacache = data;
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131 draw_graph();
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132 }
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133
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134 function update_data() {
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135 /* Cancel any pending timeout (eg if the user pressed update) */
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136 if (timer != null)
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137 clearTimeout(timeout);
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138 jQuery.getJSON('iwws/getdata.json', got_data);
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139 /* Set to refresh in 10 minutes */
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140 timeout = setTimeout(update_data, 10 * 60 * 60);
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141 }
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142
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143 $(document).ready(function(){
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144 update_data();
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145
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146 $('body').bind('turn', function(event, info) {
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147 draw_graph();
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148 });
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149 });