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Index › Programming Questions & Help › Syntax Questions › draw()ing for beginners
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draw()ing for beginners (Read 2042 times)
fry
Re: draw()ing for beginners
Reply #15 - Oct 19th, 2005, 12:43am  
from the look of this code, my guess is that you're holding down the 's' key, which will cause keyPressed() to be called several times, the same way a key repeats if you hold it down in an application.

which would cause it to save several images in sequence, slowing things down significantly.
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mtahti
Re: draw()ing for beginners
Reply #16 - Oct 19th, 2005, 8:32am  
Nope, I did not (and I am absolutely certain of that).
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mtahti
Re: draw()ing for beginners
Reply #17 - Oct 19th, 2005, 10:13pm  
I modified the example program C a bit to prove my point:

Code:
// Example D: No keyboard input but things get r-e-eally sluggish anyway

color[] cols = new color[3];
int a = 0, b = 0, f = 0, t = 0;

void setup() {
  size(100, 100);
  cols[0] = color(255, 0, 0);
  cols[1] = color(0, 255, 0);
  cols[2] = color(0, 0, 255);
  t = millis();
}

void draw() {
  f++;
  a = (a + 1) % 2;
  b = (b + 1) % 3;
  stroke(cols[b]);
  for ( int y = a; y < 100; y += 2) {
    line(0, y, 99, y);
  }
  if ( f % 100 == 0 ) {
    float frate = 100000.0 / (millis() - t);
    println("Framerate = " + frate + " fps. Saving frame " + f + " ...");
    saveFrame();
    t = millis();
  }
}


I get the following output:

Code:
Framerate = 296.7359 fps. Saving frame 100 ...
Framerate = 4.9050865 fps. Saving frame 200 ...
Framerate = 5.0190725 fps. Saving frame 300 ...
Framerate = 4.920049 fps. Saving frame 400 ...


That's whopping 98% decrease in performance after the first call to saveFrame().
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JohnG
Re: draw()ing for beginners
Reply #18 - Oct 20th, 2005, 12:06pm  
I've just tried this on 0093, and I don't get any decrease in framerate. (Oh and your printed framerate is 10 times higher than reality, try printing the built-in variable 'framerate')


Code:
Framerate = 492.61084 fps. Saving frame 100 ...
Framerate = 492.61084 fps. Saving frame 200 ...
Framerate = 492.61084 fps. Saving frame 300 ...
Framerate = 531.9149 fps. Saving frame 400 ...
Framerate = 531.9149 fps. Saving frame 500 ...
Framerate = 492.61084 fps. Saving frame 600 ...
Framerate = 492.61084 fps. Saving frame 700 ...
Framerate = 492.61084 fps. Saving frame 800 ...
Framerate = 492.61084 fps. Saving frame 900 ...
Framerate = 531.9149 fps. Saving frame 1000 ...
Framerate = 531.9149 fps. Saving frame 1100 ...
Framerate = 531.9149 fps. Saving frame 1200 ...
Framerate = 492.61084 fps. Saving frame 1300 ...
Framerate = 492.61084 fps. Saving frame 1400 ...
Framerate = 492.61084 fps. Saving frame 1500 ...
Framerate = 531.9149 fps. Saving frame 1600 ...
Framerate = 531.9149 fps. Saving frame 1700 ...
Framerate = 492.61084 fps. Saving frame 1800 ...
Framerate = 492.61084 fps. Saving frame 1900 ...
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mtahti
Re: draw()ing for beginners
Reply #19 - Oct 20th, 2005, 12:14pm  
Quote:
(Oh and your printed framerate is 10 times higher than reality, try printing the built-in variable 'framerate')


I'm an optimist, can't help it Wink
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