> Ian, Thanks for the response. I actually just started programming a little over a year ago. So I have some experience, but I have never done anything with graphics before and FLTK was recommended to me to start out with. I saw both of your responses. I appreciate it very much. I am not sure if I can use that because I am programming with c++ on Ubuntu. Would it be the same for the most part? I will have to look thoroughly through what you wrote and the code you provided now. Thanks again for your response, you have given me plenty to learn from.
-Sam > 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
