qt_demoe/third/qcustomplotdemo/main.cpp

#pragma execution_character_set("utf-8")

#include "frmmain.h"
#include <QApplication>
#include <QTextCodec>
#include <QFontDatabase>
#include <QTime>
#include <QDebug>

int main(int argc, char *argv[])
{
#if (QT_VERSION >= QT_VERSION_CHECK(5,0,0))
    QApplication::setAttribute(Qt::AA_Use96Dpi);
#endif
#if (QT_VERSION >= QT_VERSION_CHECK(5,14,0))
    QApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::Floor);
#endif

    QApplication a(argc, argv);
    QFont font;
#ifdef Q_OS_WASM
    QString fontFile = ":/font/DroidSansFallback.ttf";
    QString fontName = "Droid Sans Fallback";

    //判断图形字体是否存在,不存在则加入
    QFontDatabase fontDb;
    if (!fontDb.families().contains(fontName)) {
        int fontId = fontDb.addApplicationFont(fontFile);
        QStringList listName = fontDb.applicationFontFamilies(fontId);
        if (listName.count() == 0) {
            qDebug() << QString("load %1 error").arg(fontName);
        }
    }

    //再次判断是否包含字体名称防止加载失败
    if (fontDb.families().contains(fontName)) {
        font = QFont(fontName);
#if (QT_VERSION >= QT_VERSION_CHECK(4,8,0))
        font.setHintingPreference(QFont::PreferNoHinting);
#endif
    }
#else
    font.setFamily("Microsoft Yahei");
    font.setPixelSize(13);
#endif
    a.setFont(font);

#if (QT_VERSION < QT_VERSION_CHECK(5,0,0))
#if _MSC_VER
    QTextCodec *codec = QTextCodec::codecForName("gbk");
#else
    QTextCodec *codec = QTextCodec::codecForName("utf-8");
#endif
    QTextCodec::setCodecForLocale(codec);
    QTextCodec::setCodecForCStrings(codec);
    QTextCodec::setCodecForTr(codec);
#else
    QTextCodec *codec = QTextCodec::codecForName("utf-8");
    QTextCodec::setCodecForLocale(codec);
#endif

    //初始化随机数种子
    QTime t = QTime::currentTime();
    srand(t.msec() + t.second() * 1000);

    frmMain w;
    w.setWindowTitle("qcustomplot示例 (QQ: 517216493 WX: feiyangqingyun)");
    w.resize(1000, 650);
    w.show();

    return a.exec();
}