Hide and show image after x seconds

Core Library Questions

dekostar

Hide and show image after x seconds

in Core Library Questions • 1 year ago

Hello,

I want to let Processing show an image after x seconds. And I want to hide another image simultaneously.

I don't know really how the seconds() and millis() works, so thats a problem.

I made this little script:

void draw() {
float m = millis();
delay(3000);
fill(m % 50 + 1000);
rect(0, 0, 640, 480);
}

A rectaingle appears after a few seconds, but I can't put it in another project because of the delay.
So is there a better way to do this?

Thank you?

Replies(3)

jbum

Re: Hide and show image after x seconds

1 year ago

1) Don't ever use delay(). It's pretty much always a bad idea. Remember that draw() is supposed to be called many times per second. Instead, modify your code so that when it is called X seconds in the future, it does the right thing. You can do this with millis().

2) millis() starts at zero (when your sketch starts running) and then starts counting up. After one second, it has a value of 1000. After two seconds it has a value of 2000, and so on.

3) Here's some sample code that does one thing for 5 seconds and then something else afterwards. This is the basic type of framework you need.

void draw()

{

if (millis() < 5*1000) {

background(0);

}

else {

background(1);

}

4) seconds() is not as good for this, because it doesn't start at zero.

Chrisir

Re: Hide and show image after x seconds

1 year ago

Hello,

delay is not recommended.

instead:

final int HowLongIsItWaiting1 = 900;
final int HowLongIsItWaiting2 = 700;
float m ; // sores millis()
char state='A'; // A or B
void setup () {
size (700, 700);
background (111);
noStroke();
state='A';
m = millis();
} // func
void draw() {
if (state=='B') {
if (millis()-m>HowLongIsItWaiting1) {
//fill(m % 50 + 1000);
fill(200, 222, 0);
rect(220, 220, 640, 480);
fill(111);
rect(110, 110, 50, 50);
m = millis();
state='A';
} // if
} // if
else if (state=='A') {
if (millis()-m>HowLongIsItWaiting2) {
//fill(m % 50 + 1000);
fill(111);
rect(220, 220, 640, 480);
fill(200, 222, 0);
rect(110, 110, 50, 50);
m = millis();
state='B';
} // if
} // if
} // func

dekostar

Re: Hide and show image after x seconds

1 year ago

Thank you!! It helped me a lot!

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