How to put a pixel on window?
I want to draw a RGB pixel on a window.
but.. I dont find an API like a putPixel on C lib.
Could you let me know how to put a RGB pixel on a window?
thanks a lot
@hjpark Hi, and welcome to the Qt forum! Simply derive from QWidget and override its paintEvent method. You can then draw whatever you want inside there.
@Wieland Thanks a lot for your help.. I succeeded to draw a point with this code but I have to draw a point whenever getting some datas from a USB device. but, I don't know how to raise paintEvent manually when I want.
It seems to be called when the widget showed but I don't know how to call paintEvent when I get a data from USB devie. pls help me again . thanks a lot.
void Widget::paintEvent(QPaintEvent *event)
QPainter painter; painter.begin(this); painter.setPen(Qcloor(10,10,10); painter.drawPoint(10,10); painter.end();
Once you received new data and want the widget to be painted again just call this function on it:
[slot] void QWidget::update(), see also: QWidget Class.