hi, just to notice, I used to use [GEMglBegin] -> [GEMglVertex2d] -> [GEMglVertex2d] -> [GEMglEnd] structure to draw line directly on screen the first GEMglVertex2d is the starting point, the second the end point in conjunction with [gemlist] you can draw line with an arbitrary number of segments which is -- but it's only my point of view -- more convinient than using multiple rectangles (and it's also more efficient because there is no extra point) the line width is set with the [GEMglLineWidth] object... a good example for that is the pix_opencv_countours-help.pd patch which is in pix_opencv (but i know it's not really easy to find it nor to build it but we are currently working to improve that)
best a -- do it yourself http://antoine.villeret.free.fr http://drii.ensad.fr -- Google lit ce mail... si vous refusez cela, utilisez l'adresse antoine.villeret [at] free.fr pour me contacter 2012/12/18 Alexandros Drymonitis <adr...@gmail.com>: > Thanks Cyrille, this is what I wanted. > > > On Tue, Dec 18, 2012 at 2:25 PM, Cyrille Henry <c...@chnry.net> wrote: >> >> hello, >> >> ok, i can see why it's complicated to use rectangle in this situation. >> But i did not see the problem of the curve object. >> >> >> in order to "give this line an angle", i think it's best to use the rotate >> object than the shear. >> >> computation are not that hard with rectangle if you do it right : >> gemhead >> translateXYZ <- give random position >> rotateXYZ <- give Z rotation >> scaleXYZ 0 1 1 <- change X scale to grow >> translate 0.5 0 0 <- to move the primitive so that it's not center >> rectangle 0.5 0.1 <- 0.1 is line width >> >> starting point is given by the initial translate. >> ending point is just : starting point + cos(angle)*line length for X >> coordinate, >> replace cos with sin for Y position (be aware that Gem is in deg, while pd >> is in rad) >> >> >> >> but if you prefer having random initial position and random final >> position, then a [curve 2] object can be more helpful. >> >> see both solution in attachment. >> >> >> cheers >> Cyrille >> >> >> >> >> Le 18/12/2012 12:46, Alexandros Drymonitis a écrit : >>> >>> Hi all, >>> >>> I've been trying to render a line in Gem, so I'm wondering if it's best >>> to use [curve] (which is actually a curve as it indicates), or [rectangle] >>> with a very small x value, so that it looks like a line. >>> My problem is that I want to give this line an angle, so I've been using >>> [shearXY] for now. I also want to make the line grow from nothing to the >>> full desired length, but with [rectangle] it will grow from the middle, so >>> in order to make it grow from the starting point to the ending point, you >>> have to give [rectangle] a continuous x,y offset. >>> This way it's really hard to determine the starting and ending point of >>> the line. So, If for example the x,y coordinates of the starting and ending >>> point are random, then the angle and length will also be random and you'll >>> have to manipulate three different objects simultaneously ([rectangle], >>> [translate] and [shearXY]), and I'm not sure if I can find the formula for >>> all these calculations. >>> Is there an easier technique for this? >>> >>> >>> _______________________________________________ >>> Pd-list@iem.at mailing list >>> UNSUBSCRIBE and account-management -> >>> http://lists.puredata.info/listinfo/pd-list >>> > > > _______________________________________________ > Pd-list@iem.at mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > _______________________________________________ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list