如何更改QGraphicsTextItem的颜色

Question

i have a scene with a multiple (QGraphicsTextItem)s, and i need to have control over their colors , so how to change a color of a QGraphicsTextItem ? is it possible anyway? i've been trying for 3 days until now . please help

thanks in advance

Answer 1

I think you can change the text color by calling the method:

void QGraphicsTextItem::setDefaultTextColor ( const QColor & col );

You have an example here .

Or looking for Diagram Scene Example in your Qt Assistant.

Answer 2

setDefaultTextColor(col) "Sets the color for unformatted text to col." The documentation is not clear about what "unformatted text" means. I think it means: "all portions of the contents of the item that have not been styled."

The contents is a QTextDocument.

You style a part of a document using a QTextCursor. You can't style the QTextDocument per se, only a part that is selected by a QTextCursor (but you can select the whole document.)

You can style a QTextCursor using method mergeCharFormat(QTextCharFormat)

The QTextCharFormat has methods:

• foreground().setColor(QColor)
• setForeground(QBrush)
• setTextOutline(QPen)

Foreground is a QBrush that paints several things including "text" (but better said: the fill of characters?)

One nuance is that certain newly constructed QBrush have (default to) QBrushStyle.NoBrush, which is transparent, even if you setColor().