Updating the screen only once a while

General Discussion Other

plamoni33

Updating the screen only once a while

in General Discussion • Other • 6 months ago

Hello,

I have a draw() loop that contains both some calculations and drawing. for efficiency reasons, I want to do the calculations continuously, but updating the screen only once a while. Is it possible?

Thanks.

Replies(4)

v.k.

Re: Updating the screen only once a while

6 months ago

Just put your drawing inside an if() and test for the moment to draw. like

int x;
void draw(){
x++;
// more and more calcs...
if(x%100 == 0)
ellipse(random(width), random(height), 10, 10);
}

pixelorch..

Re: Updating the screen only once a while

6 months ago

something like:

int start; // stores the begin value of timer
int myCalc; // stores my calculation
void setup() {
size(400, 400);
start = millis();
fill(255);
background(0);
}
void draw() {
calcSomething();
int timer = millis()-start;
// it draws every 2000 milliseconds
if (timer>2000) {
start = millis(); // reset the timer
drawSomething(); // call the drawSomething function
}
println(timer);
}
void calcSomething() {
myCalc+=1;
}
void drawSomething() {
background(0); // refresh the window
text(myCalc, width/2, height/2);
}

GoToLoop

Re: Updating the screen only once a while

6 months ago

Processing already has a variable which counts how many times draw() was called -> frameCount
Let's say you want a graphics update refresh every 10 frames; here's a sample scheme for it:

void draw() {

  // put your calculation code part below:

  //...

  // prematurely quits draw() 9x outta 10 frames:
  if (frameCount % 10 != 0)    return;

  // put your display code part below:

  //...
}

Also, you can control how fast draw() is called back by setting -> frameRate( FPS );

plamoni33

Re: Updating the screen only once a while

6 months ago

Thank you all!

Top Reply