Hi all I'm trying to Draw some things on various points around a circle.
(Making a dial control)


If I use the following code…
That gives me a circle.
But now i want to Paint things at various places around the circle

Say If it was a clock and i wanted to place 60 dots around it.

360 degrees divided by 60 places around the circumference

But what commands would i use to get those positions?

Any help appreciated

BruceSteers said

…360 degrees divided by 60 places around the circumference

But what commands would i use to get those positions?

A rotating vector can be generated using trigonometry, so I think you use the Cosine of the angle to find the x & y points to draw your dots/marks/mini-circles.

I'll try and generate an example when I have time later today, unless Charlie comes up with an oven-ready solution in the meantime.

OK, this simple code demonstrates positioning a circle marker in one quadrant of a larger circle.
It just uses a Form, DrawingArea and a Timer;


By changing line 19 to this, you get coverage of a second quadrant;


…and similar sign changes for the other 2 quadrants.

Obviously this is not the full solution to your problem, but I hope it sets you on the right path.

I'll try and generate an example when I have time later today, unless Charlie comes up with an oven-ready solution in the meantime.

That made the wife and me laugh this morning. In true cooking programming style, here is one I prepared earlier. Have a look at 'Analogue Clock' which is on the Gambas Farm. The maths was done by my friend Matt.

<IMG src="https://www.cogier.com/gambas/AN_CLOCK.png"> </IMG>

Not Matt Crick by any chance?
I have an old friend lives on your rock, Lucy Crick and her fella Mathew.


Thanks guys , i should be able to work stuff out from there

BruceSteers said

Not Matt Crick by any chance?
I have an old friend lives on your rock, Lucy Crick and her fella Mathew.

No not that Mathew, this one.

I have done a little more work on this. Does this help?
Run the code in a new graphical  program.

<IMG src="https://www.cogier.com/gambas/GoFaster.png"> </IMG>

cogier said

I have done a little more work on this. Does this help?
Run the code in a new graphical  program.

That's awesome m8 thank you
minimalistic so easier to get my head around

To be honest, as much as I really appreciated the previous help it did give me a headache so i resorted to using images and the image.Rotate command.

But with that example i think i could get on it with a hand drawn object

My objective was to make a cool slider like object that spins like a dial.

What i've made is something i call ImageSpinner.class

<VIDEO content="https://bws.org.uk/images/screenrecord-2022-01-06_20.00.42.mp4">[video size=300,300]

[/video]</VIDEO>

You can use custom images for the background and for the button.

it's wip at mo and needs a lot of work on the mouse controls

With the above code example i think i can possibly add a custom background making property to add the ticks like on the dial of your example

Nice one fella, cheers

Hi Bruce, I had a look at your example and wondered if you were aware of the Dial available in Gambas. You need gb.qt5.ext for this: -

<IMG src="https://www.cogier.com/gambas/Dial.png"> </IMG>

cogier said

Hi Bruce, I had a look at your example and wondered if you were aware of the Dial available in Gambas. You need gb.qt5.ext for this: -

<IMG src="https://www.cogier.com/gambas/Dial.png"> </IMG>

Haha , no i was not ,, that's exactly what i was aiming for.  but not qt dependant.

I'm hoping to make mine highly customisable.

currently it has 2 modes, spinner and switch ,
spinner for a dial that goes round and round
and switch for a positional switch