QWT Plot应用例程

#include <qstringlist.h> #include <qfile.h> #include <qtextstream.h> #include "cpustat.h" CpuStat::CpuStat() { lookUp( procValues ); } QTime CpuStat::upTime() const { QTime t( 0, 0, 0 ); for ( int i = 0; i < NValues; i++ ) t = t.addSecs( int( procValues[i] / 100 ) ); return t; } void CpuStat::statistic( double &user, double &system ) { double values[NValues]; lookUp( values ); //userdata曲线值 double userDelta = values[User] + values[Nice] - procValues[User] - procValues[Nice]; //systemData曲线值 double systemDelta = values[System] - procValues[System]; //总计值 double totalDelta = 0; for ( int i = 0; i < NValues; i++ ) totalDelta += values[i] - procValues[i]; user = userDelta / totalDelta * 100.0; system = systemDelta / totalDelta * 100.0; for ( int j = 0; j < NValues; j++ ) procValues[j] = values[j]; } void CpuStat::lookUp( double values[NValues] ) const { QFile file( "/proc/stat" ); //若是不能打开linux的进程监控文件，自定义模拟数据 if ( !file.open( QIODevice::ReadOnly ) ) { static double dummyValues[][NValues] = { { 103726, 0, 23484, 819556 }, { 103783, 0, 23489, 819604 }, { 103798, 0, 23490, 819688 }, { 103820, 0, 23490, 819766 }, { 103840, 0, 23493, 819843 }, { 103875, 0, 23499, 819902 }, { 103917, 0, 23504, 819955 }, { 103950, 0, 23508, 820018 }, { 103987, 0, 23510, 820079 }, { 104020, 0, 23513, 820143 }, { 104058, 0, 23514, 820204 }, { 104099, 0, 23520, 820257 }, { 104121, 0, 23525, 820330 }, { 104159, 0, 23530, 820387 }, { 104176, 0, 23534, 820466 }, { 104215, 0, 23538, 820523 }, { 104245, 0, 23541, 820590 }, { 104267, 0, 23545, 820664 }, { 104311, 0, 23555, 820710 }, { 104355, 0, 23565, 820756 }, { 104367, 0, 23567, 820842 }, { 104383, 0, 23572, 820921 }, { 104396, 0, 23577, 821003 }, { 104413, 0, 23579, 821084 }, { 104446, 0, 23588, 821142 }, { 104521, 0, 23594, 821161 }, { 104611, 0, 23604, 821161 }, { 104708, 0, 23607, 821161 }, { 104804, 0, 23611, 821161 }, { 104895, 0, 23620, 821161 }, { 104993, 0, 23622, 821161 }, { 105089, 0, 23626, 821161 }, { 105185, 0, 23630, 821161 }, { 105281, 0, 23634, 821161 }, { 105379, 0, 23636, 821161 }, { 105472, 0, 23643, 821161 }, { 105569, 0, 23646, 821161 }, { 105666, 0, 23649, 821161 }, { 105763, 0, 23652, 821161 }, { 105828, 0, 23661, 821187 }, { 105904, 0, 23666, 821206 }, { 105999, 0, 23671, 821206 }, { 106094, 0, 23676, 821206 }, { 106184, 0, 23686, 821206 }, { 106273, 0, 23692, 821211 }, { 106306, 0, 23700, 821270 }, { 106341, 0, 23703, 821332 }, { 106392, 0, 23709, 821375 }, { 106423, 0, 23715, 821438 }, { 106472, 0, 23721, 821483 }, { 106531, 0, 23727, 821517 }, { 106562, 0, 23732, 821582 }, { 106597, 0, 23736, 821643 }, { 106633, 0, 23737, 821706 }, { 106666, 0, 23742, 821768 }, { 106697, 0, 23744, 821835 }, { 106730, 0, 23748, 821898 }, { 106765, 0, 23751, 821960 }, { 106799, 0, 23754, 822023 }, { 106831, 0, 23758, 822087 }, { 106862, 0, 23761, 822153 }, { 106899, 0, 23763, 822214 }, { 106932, 0, 23766, 822278 }, { 106965, 0, 23768, 822343 }, { 107009, 0, 23771, 822396 }, { 107040, 0, 23775, 822461 }, { 107092, 0, 23780, 822504 }, { 107143, 0, 23787, 822546 }, { 107200, 0, 23795, 822581 }, { 107250, 0, 23803, 822623 }, { 107277, 0, 23810, 822689 }, { 107286, 0, 23810, 822780 }, { 107313, 0, 23817, 822846 }, { 107325, 0, 23818, 822933 }, { 107332, 0, 23818, 823026 }, { 107344, 0, 23821, 823111 }, { 107357, 0, 23821, 823198 }, { 107368, 0, 23823, 823284 }, { 107375, 0, 23824, 823377 }, { 107386, 0, 23825, 823465 }, { 107396, 0, 23826, 823554 }, { 107422, 0, 23830, 823624 }, { 107434, 0, 23831, 823711 }, { 107456, 0, 23835, 823785 }, { 107468, 0, 23838, 823870 }, { 107487, 0, 23840, 823949 }, { 107515, 0, 23843, 824018 }, { 107528, 0, 23846, 824102 }, { 107535, 0, 23851, 824190 }, { 107548, 0, 23853, 824275 }, { 107562, 0, 23857, 824357 }, { 107656, 0, 23863, 824357 }, { 107751, 0, 23868, 824357 }, { 107849, 0, 23870, 824357 }, { 107944, 0, 23875, 824357 }, { 108043, 0, 23876, 824357 }, { 108137, 0, 23882, 824357 }, { 108230, 0, 23889, 824357 }, { 108317, 0, 23902, 824357 }, { 108412, 0, 23907, 824357 }, { 108511, 0, 23908, 824357 }, { 108608, 0, 23911, 824357 }, { 108704, 0, 23915, 824357 }, { 108801, 0, 23918, 824357 }, { 108891, 0, 23928, 824357 }, { 108987, 0, 23932, 824357 }, { 109072, 0, 23943, 824361 }, { 109079, 0, 23943, 824454 }, { 109086, 0, 23944, 824546 }, { 109098, 0, 23950, 824628 }, { 109108, 0, 23955, 824713 }, { 109115, 0, 23957, 824804 }, { 109122, 0, 23958, 824896 }, { 109132, 0, 23959, 824985 }, { 109142, 0, 23961, 825073 }, { 109146, 0, 23962, 825168 }, { 109153, 0, 23964, 825259 }, { 109162, 0, 23966, 825348 }, { 109168, 0, 23969, 825439 }, { 109176, 0, 23971, 825529 }, { 109185, 0, 23974, 825617 }, { 109193, 0, 23977, 825706 }, { 109198, 0, 23978, 825800 }, { 109206, 0, 23978, 825892 }, { 109212, 0, 23981, 825983 }, { 109219, 0, 23981, 826076 }, { 109225, 0, 23981, 826170 }, { 109232, 0, 23984, 826260 }, { 109242, 0, 23984, 826350 }, { 109255, 0, 23986, 826435 }, { 109268, 0, 23987, 826521 }, { 109283, 0, 23990, 826603 }, { 109288, 0, 23991, 826697 }, { 109295, 0, 23993, 826788 }, { 109308, 0, 23994, 826874 }, { 109322, 0, 24009, 826945 }, { 109328, 0, 24011, 827037 }, { 109338, 0, 24012, 827126 }, { 109347, 0, 24012, 827217 }, { 109354, 0, 24017, 827305 }, { 109367, 0, 24017, 827392 }, { 109371, 0, 24019, 827486 }, }; static int counter = 0; //将dummyValues初始化为values一维数组 for ( int i = 0; i < NValues; i++ ) values[i] = dummyValues[counter][i]; counter = ( counter + 1 ) % ( sizeof( dummyValues ) / sizeof( dummyValues[0] ) ); } else//打开linux系统真实数据 { QTextStream textStream( &file ); do { QString line = textStream.readLine(); line = line.trimmed(); if ( line.startsWith( "cpu " ) ) { const QStringList valueList = line.split( " ", QString::SkipEmptyParts ); if ( valueList.count() >= 5 ) { for ( int i = 0; i < NValues; i++ ) values[i] = valueList[i+1].toDouble(); } break; } } while( !textStream.atEnd() ); } }