Artificial Horizon like in Mission Planer

[BrMisha]

Hi!
I need to make Artificial Horizon like in Mission Planer http://ardupilot.org/planner/docs/mission-planner-ground-control-station.html .
I have found some examples (Qwt and FlightInstruments) but there are oval widgets and I need rectangle.
May be somebody knows where I can get an example?
Thanks))

[Pl45m4]

@brmisha

Hi,
build your own :)

The Misson Planner Horizon Widget is nothing else than a rotating rectangle inside a bounding box (if you ignore the fancy stuff and some scales)

Have a look here: https://forum.qt.io/topic/105507/setrotation-does-not-react-so-settransformationoriginpoint/2

https://doc.qt.io/qt-5/qgraphicsitem.html

[Pablo J. Rogina]

@brmisha said in Artificial Horizon like in Mission Planer:

there are oval widgets and I need rectangle.

Just put such widgets on top of a rectangle, and you're done with such requirement...

[Kent-Dorfman]

This type of widget design should be a formal Qt training exercise because it exposes the student to some fundamental concepts of custom paint events and using the QPainter, while creating something that many programmers will eventually want to see anyways.

[BrMisha]

@pl45m4 I need pitch too)))
I have a good experiences with Qt, but with console apps, whithout witgets.
Ok, I will try to build my own)))

[BrMisha]

In paintEvent

const int	width = size().width();
	const int	height = size().height();
	const int	halfwidth = width/2;
	const int	halfheight = height/2;
	const qreal	every5deg = -height / 60;
	const qreal	pitchoffset = -pitch * every5deg;

	qreal pitch = -13.7;
	qreal roll = -10.1;

	QPainter painter(this);
	painter.save();

	painter.translate(width/2, height/2);
	painter.rotate(-roll);

	qreal offset = 0.5 + pitchoffset / height / 2;
	if (offset < 0) offset = 0;
	else if (offset > 1) offset = 1;

	QLinearGradient linearGrad(0, -height, 0, height);
	linearGrad.setColorAt(0, Qt::cyan);
	linearGrad.setColorAt(offset > 0 ? offset-0.001 : offset, Qt::cyan);
	linearGrad.setColorAt(offset < 1 ? offset+0.001 : offset, QRgb(0x9bb824));
	linearGrad.setColorAt(1, QRgb(0x414f07));
	QRect	rect(-width, -height, halfwidth * 4, halfheight * 4);
	painter.fillRect(rect, QBrush(linearGrad));

	// just point at center
	painter.setBrush(Qt::red);
	painter.drawEllipse(0, 0, 20, 20);

	painter.restore();

It works)))

[Pablo J. Rogina]

@brmisha said in Artificial Horizon like in Mission Planer:

It works)))

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