如何更改drawText上的字體大小？

Question

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

我想將fontSize增加到2x顯示什麼？

Answer 1

想通了：

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 2

你可以嘗試這樣的事情（未編譯的代碼，看看它是否有效！）：

QFont font = painter->font() ; 

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

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

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

Answer 3

這是最簡單的方式

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