c++ - 如何更改drawText上的字体大小？

Question

QString str = QString::number((double)i, 'd', 1);
painter->drawText(100 + i * 800/9 - 6, 910, 40, 40, 0, str );

我想将 fontSize 增加到 2x 显示什么？

Answer 1

您可以尝试这样的事情（尚未编译代码以查看它是否有效！）：

QFont font = painter->font() ;

/* twice the size than the current font size */
font.setPointSize(font.pointSize() * 2);

/* set the modified font to the painter */
painter->setFont(font);

/* draw text etc. */
painter.drawText(....);

Answer 2

弄清楚了：

QFont font;
font.setPixelSize(12);

for(int i = 0; i < 10; i++){
    painter->drawLine(100, 100 + i * 800/9, 900, 100 + i * 800/9);
    str = QString::number((double)9 - i, 'd', 1);
    painter->setFont(font);
    painter->drawText(75, 100 + i * 800/9 - 6, 40, 40, 1, str);
}

Answer 3

这是最简单的方法

painter.setFont(QFont("times",22)); //22 is a number which you have to change