rotate a bitmap about it's centre

[nimbusgb]

trying to rotate a bitmap of a compass card around its own centre.

Any pointers would be appreciated!

[nimbusgb]

might have sorted some of it but i need to calculate the centre of the plotted bitmap. If the gui display is resized then the centre of rotation moves and things go wrong.

I have attached a copy of my display but not sure if that encapsulates the bitmaps??

It should display this




Can I just add how blown away I am at this! What a cracking piece of software! The manuals could do with a bit of work, working out where to put things like the redraw of a bitmap is mostly trial and error but 2 days ago I had not heard of Flowstone and in one evening I produced a working compass display, got a feed from a com port going, filtered out a csv stream and can control my display from a piece of hardware.

Excellent! I'll certainly be spreading the word to some of the user groups I am in!

[Morph]

Looks good!

To optimize the redrawing a bit you can change the Redraw primitive to a Redraw Area to make the redraw area as small as possible. Also using a Float Changed can reduce triggers when triggers are sent without changing value.

compass_redraw_area.fsm

(32.4 KiB) Downloaded 1197 times

[fixstuff555]

Well done.

I have to say that's one of the best looking graphic bitmaps I've seen on these forums.

[horaceoz]

good work on the compass
used this with the phidgets 3/3/3 for spatial info for my Land Rover

does anyone know how to use the 3 axis compass readings to allow pitch and roll compensation?

[Embedded]

Depends what it is your controlling. But it will involve using the PID module to give nice progressive results.

[horaceoz]

At the mo I am using the yaw for compass heading for testing but I would like to use the compass data