[Csnd] CsoundQt examples 3: use native widgets as gui for score generation
| Date | 2012-01-12 14:25 |
| From | Tarmo Johannes |
| Subject | [Csnd] CsoundQt examples 3: use native widgets as gui for score generation |
| Attachments | pluck.csd simple-score-generation2.py |
| Hello Let's go back to the example that generates a score that plays an instrument for given amount of times with given parameters In the first example I showd a very simple one-line inputDialog widget where user could enter the count of the scorelines to be generated. It would be logical to be able to set comfortably also other parameters - timespan, maximum amount of the rise and decay amount of the envelope (and so on, if one wishes). The easiest GUI could be done actually with the native widgets of CsoundQt itself. For this example I inserted two spinboxes for channels "count" (number of events) and "span" (the time during the events should start) and two sliders for the percentage of rise and decay. The csd (pluck.csd) with the widgets is attached to the e-mail. It is possible to read the value of the widgets even if Csound does not run at the moment. You can scroll and slide the widgets and read the values with method q.setChannelValue(channel,index = -1) You can read (or also write) values of the widgets of any open document. If you want to keep your script in another tab open and then run your csd (or put the script to your scripts folder and run it from the menu), it is handy to use method index=q.getDocument(NameOfDocument) to get the index of the playing csd and later use that value to point to the right document. So the script could look like: ---------------- #!/usr/bin/env python from random import random,randint index=q.getDocument("pluck.csd") count=q.getChannelValue("count",index) span=q.getChannelValue("span",index) maxrise=q.getChannelValue("rise",index) maxdecay=1-q.getChannelValue("decay",index) # so it looks more like a tail of the envelope- slider position 75% -> maxdecay=25% print span, count, maxrise,maxdecay score="" for i in range(0,int(count)): begin =random()*span dur = random()*5+0.5 amp = randint(-30,-10) freq = randint(50,800) rise = random()*maxrise decay = random()*maxdecay line = "i 1 %.4f %.4f %d %d %.4f %.4f\n" % (begin, dur, amp,freq,rise,decay) score+=line q.setSco(score,index) q.play(index) ----------- greetings, tarmo |