On 29 Aug 2009, at 17:48, Sam wrote: > Hi I am new to FLTK and to programming in general.
How new to programming? If *very* new, then the ideas I'm about to pitch might be too abstract to make sense to you - in which case, sorry! > I am working on a robot that is using two Laser range finders. Sounds cool... > I have constructed it in a way that they give me a 2 dimensional > array filled with distance values. I want to have this > continuously upgrading 2-d array made into a color image. The > cells of the matrix are distance values from the scanners, in a > Cartesian plane. The pixel colors would be a threshold value of > the distance values. So for example distances from 0 to 100cm > would show up as an increasing intensity of the color blue, > distances from 50 to 150cm would show up as an increasing intensity > of the color green, and distances from 100 to 200cm would show up > as increasing intensity of the color red. So it is basically like > a video feed from the two laser scanners. OK, first I'd decide how many distinct ranges I thought I could resolve, and then generate an array that would be a lookup table that would be indexed by range. So, if we thought we could resolve to 1cm accuracy over the 0 - 200cm range, the table would have 200 entries. Each entry would be filled in with the appropriate colour value as RGB (say, or possible indexed...) I'd then derive the display from something simple, like a box, and attach an Fl_RGB_Image or similar to that, and create another array to use for the 2-D image. How big would this be? I guess not very, as the azimuth resolution of your sensor maybe isn't hat great? Lets guess it's 512x512. This array becomes the image data for the Image widget, and each time you scan your sensor you update that array (mapping ranges to colours then placing the colours in the image array) and call redraw on the image widget. Bingo, job done. Well, OK, might be a little harder than that in practice... This HowTo might give you some ideas to get started with though: http://www.fltk.org/articles.php?L468 -- Ian _______________________________________________ fltk mailing list [email protected] http://lists.easysw.com/mailman/listinfo/fltk
