Qt常用例程

读文件:

QFile dictionaryFile(":/dictionary/words.txt");
     dictionaryFile.open(QIODevice::ReadOnly);
     QTextStream inputStream(&dictionaryFile);

     int x = 5;
     int y = 5;

     while (!inputStream.atEnd()) {
         QString word;
         inputStream >> word;
         if (!word.isEmpty()) {
             DragLabel *wordLabel = new DragLabel(word, this);
             wordLabel->move(x, y);
             wordLabel->show();
             x += wordLabel->width() + 2;
             if (x >= 195) {
                 x = 5;
                 y += wordLabel->height() + 2;
             }
         }
     }


绝对值:qAbs 最大值qMax
QTime time = QTime::currentTime();

painter.translate(width() / 2, height() / 2);

painter.save();
painter.rotate(30.0 * ((time.hour() + time.minute() / 60.0))); //clockwise
painter.drawConvexPolygon(hourHand, 3);
painter.restore();


定义图形

static const QPoint hourHand[3] = {
         QPoint(7, 8),
         QPoint(-7, 8),
         QPoint(0, -40)
     };

 

QString("Column %1").arg(section);