Graph grid and axes not drawn when not cleared previously

[crteensy]

I just compiled the graph demo for playing with it and noticed that the plots are drawn correctly, but the grids and axes are invisible. This can be fixed by calling gwinClear(gh) before doing any further init, but that's not documented and it's also missing in the demo code. So the correct init code should be

	gwinClear(gh); // <------ add this, line 80
	gwinGraphSetOrigin(gh, gwinGetWidth(gh)/2, gwinGetHeight(gh)/2);
	gwinGraphSetStyle(gh, &GraphStyle1);
	gwinGraphDrawAxis(gh);

instead of

	gwinGraphSetOrigin(gh, gwinGetWidth(gh)/2, gwinGetHeight(gh)/2);
	gwinGraphSetStyle(gh, &GraphStyle1);
	gwinGraphDrawAxis(gh);

Edit: The documentation says "The graph is not automatically cleared. You must do that first by calling gwinClear()." but to me that doesn't indicate that the axes and grid won't be drawn when the graph is not cleared.

[inmarket]

Not sure why the axis and grid are not being displayed without the clear first - they used to. This is a very old demo however and has not been checked in a long time so I will debug to see what is happening when I get a moment.

Theoretically as the screen is already clear it shouldn't be necessary to clear it again. I suspect some of the widget flags are no longer being initialised correctly.

Glad you found a work around in the mean time.

[MobileWill]

Not to bring a thread from the dead but this solved my problem of the graph not showing. I was just testing the axis without plotting and for a split second I could see them. I put the graph in an container but didn't help till I did the clear first.

[Joel Bodenmann]

Thank you, we will have a look at the demo and fix whatever needs to be fixed :ugeek:

~ Tectu

[inmarket]

This has now been fixed in the repository.

The problem was that the window manager was delaying the initial clear (from when the graph widget was set visible) and when this clear happened it was overwriting the axis.