How to paint to pixmap ?
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Hi
It seems ok. ( as far as i can read python)
You create pixmap with some size. Assign the painter to it via its
ctor.This surely paints
int GetBarHeight(int MAX) { return rand() % (MAX - 5) + 5; } void MainWindow::on_pushButton_released() { int h = ui->label->height(); int w = ui->label->width(); QPixmap pix(w, h); QPainter paint(&pix); pix.fill( Qt::white ); paint.setPen(QColor(0, 0, 0, 255)); int y = 0; int x = 0; int bw = 10; // bar width for (int barcount = 0; barcount < 12; ++barcount) { paint.setBrush(QColor(255 - x, 34 + x, 255, 255)); paint.drawRect(x, h - GetBarHeight(h), bw, h ); x += bw + 4; } paint.end(); ui->label->setPixmap(pix); }
The crashing part is ODD. i though python was pretty safe int that reagrds.
In any case, you seem to assign it to a label ?
self.l.setPixmap(m)
Is the l valid ?
I assume you can have dangling pointers too in pyt. -
@mrjj Thanks for example & checking it! I created label in constructor, will try ur code next, thanks!
@Dariusz
Ok it was not dangling pointer then. :)
I tried for fun making invalid pixmap but i could make it crash.
Maximum effect was nothing shown.
So i have a feeling the crash might have been a bit unrelated to the pixmap.But if this code also crashes, we might found some binding bug :)
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@Dariusz
Ok it was not dangling pointer then. :)
I tried for fun making invalid pixmap but i could make it crash.
Maximum effect was nothing shown.
So i have a feeling the crash might have been a bit unrelated to the pixmap.But if this code also crashes, we might found some binding bug :)
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@mrjj Running this code causes crash:
def draw(self, iconMode): m = QPixmap(500,500) ...Can't initialize QPixmap() with size.
If you could reproduce the crash, then we could post it to bug report :- )
Hi
is
m = QPixmap(500,500)like (c++)
QPixmap m(500,500);or
QPixmap *m = new QPixmap (500,500);Does it also crash there if you make new project and does nothing but
m = QPixmap(500,500)If you can make a small example that crash, its ok to open bug report.
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Hi
is
m = QPixmap(500,500)like (c++)
QPixmap m(500,500);or
QPixmap *m = new QPixmap (500,500);Does it also crash there if you make new project and does nothing but
m = QPixmap(500,500)If you can make a small example that crash, its ok to open bug report.
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@mrjj I did some tests. I looks like it crashes when I do this p= QPainter(m), so passing it as source to QPainter o.O
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Hi,
Add
p.end()when you're done painting. So in your code, before you callsetPixmap.Interested in AI ? www.idiap.ch
Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct -
I don't know how the binding manages that but when testing the code, I got the following message:
QPaintDevice: Cannot destroy paint device that is being paintedInterested in AI ? www.idiap.ch
Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct -
I don't know how the binding manages that but when testing the code, I got the following message:
QPaintDevice: Cannot destroy paint device that is being painted
