QLineSeries OpenGL issue
Unsolved
General and Desktop
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Hello Everybody,
I've been playing around with QtCharts. Thought I would convert one of my application which uses qwt to QtCharts. Unfortunatelly I'm running into some issues.
I'm not able to generate a line chart with large X values when setUseOpenGL is enabled.
Here is a code which doesn't render anything.
QLineSeries *series = new QLineSeries(); series->append(1490215139925, 0.841470985); series->append(1490215157925, 0.14987721); series->append(1490215158925, 0.912945251); series->append(1490215159925, 0.836655639); series->append(1490215160925, -0.008851309); series->setUseOpenGL(true); chart = new QChart(); chart->setTitle( ui->titleEdit->text() ); QFont tFont = chart->titleFont(); tFont.setPointSizeF( 15 ); tFont.setBold( true ); chart->setTitleFont( tFont ); axisX = new QValueAxis; axisX->setRange( (qreal)1490215139925, (qreal)1490215163925 ); axisX->setTickCount(10); axisX->setLabelFormat("%l"); axisX->setTitleText("unixTime"); axisY = new QValueAxis; axisY->setRange(-1, 1); axisY->setTitleText("Level"); chart->setAxisX(dateAxisX); chart->setAxisY(axisY); chart->addSeries(series); series->attachAxis(axisX); series->attachAxis(axisY);
As I mentioned before change setUseOpenGL to false
series->setUseOpenGL(false);
And all works fine.
Couple other things I tried or noticed:
- If x values are in 32 bit range it seems to work fine in opengl mode
- Tried changing QValueAxis to QDateTimeAxis still doesn't work in opengl mode
Any ideas is it a bug? Is there a workaround? Is this a limitation of OpenGL not able to take in large numbers?
I'm using Qt 5.8 with MinGW 5.3.0 32bit
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Hi,
I'd go check the bug report system to see if there's something related.