Matrix Orbital Corp

Hi' everyone,

I'm working on a EVE project based on Arduino using the Rudolph lib (hello, me again :)).

As this is a dataloger for motorcycle, I would like to print a RPM bargraph.

I think about differents methods :
- Prepare a dozen tiny pictures (rectangles) and print some of them to show the RPM value
- Directly draw these rectangles with VERTEX2F command
- Draw a polygone form (empty) and fill it more or less (filling it from left to right).

Here is the first example I find to show you what I expect (not exactly, but that's the idea) :


Does someone have any recommandations about this ?
Best or other solutions, pros/cons.

I often find it most efficient to directly write pixels into an image in RAM_G and display it as an image. You can draw anything you like and update it dynamically.

Hmm, the "best" method would be something that is doable with the available resources while beeing pleasant enough to look at. :-)
Bridgetech has a fancy example code somewhere that has a round graph that is using a few tricks like scissors.

Or you could use a rectangle, that is just two points and one coordinate that is changing.
Combined with changing the color for the whole thing and putting a picture over it with alpha channel it could look a little fancy
while beeing highly efficent and mostly functional.

Functional, efficent, that is my cup of tea, fancy not so much.
Not because I do not apreciate fancy, it's more that I do not apreciate what I can do in regards of graphics design. :-)

Thanks to both of you.

It has to be a little bit fancy even if I'm clearly not the best with design, drawing or anything else close to that job :D

The rectangles thing looks pretty easy and with thin rectangles like 1 or 2 pixels width I should be able to get a smooth shape.
Writing pixels into an image ... why not ... I'll need to RTFM because I'm a EVE's beginner :)

I'll post pictures as soon as I get something nice (or not)

I ran across this

Very nice !
That's what I'm trying to do :)

Tell us a little bit more about that, what method did you use ?

I didn't, I just found it, I would recommend reaching out to the author.

Oups I didn't pay attention.
He made available his example here : http://www.mediafire.com/file/x7im4ir7q ... X.rar/file

He uses rectangles method.