How to to save the time of an event such as mousePressed?

Programming Questions

amanda_23

How to to save the time of an event such as mousePressed?

in Programming Questions • 1 year ago

I have a program that is dependent of millis() so it runs as soon as I run the program, now I want to add a feature where I would have an idle program with a white screen first and everything runs only when the mouse is clicked, basically I want a way to save and use the exact time the mouse is clicked or start millis() from the moment mouse is clicked to initiate the program

right now when I start the program, it has already started running at the background even before I click the mouse because my code depends on millis(which is always increasing regardless of mouseClicked)

plus once the program is running, how would I write a code that interrupts and restarts the program everytime I click the mouse?

boolean Start= false

void setup {

"whatever"

}

void draw {

if (Start){

" eg. if(millis() < 10) {

line(x,y,width,height)"

}

void mousePressed(){

Start = true;

}

Replies(5)

maleo

Re: How to to save the time of an event such as mousePressed?

1 year ago

actually your are pretty close in your code (except that it's not a valid program). but it also depends on what you want your program to do, apart from drawing a simple line.

is this what you are looking for:

boolean start = false;
void setup() {
background(255);
}
void draw() {
if (start){
line(0,0,width,height);
}
}
void mousePressed(){
start = true;
}

for restarting the program on click: you could add a reset() function, that sets the state of your program back and call that in mousePressed().

amanda_23

Re: Re: How to to save the time of an event such as mousePressed?

1 year ago

thanks but the code above is kind of a psedocode of what I have, not the exact one. Im looking for a way to "sort of" start millis() (and my program) once mouse is clicked, as I know it's not actually possible to to reset millis() using mouseclick

maleo

Re: How to to save the time of an event such as mousePressed?

1 year ago

you might be using mills() in a wrong way... but if you really want to stick with it you can set a variable on mouse click

int startTime = 0;
void mousePressed() {
startTime = millis();
}

and in the rest of the code instead of mills() use mills()-startTime which gives you the time since you last clicked.

maleo

Re: How to to save the time of an event such as mousePressed?

1 year ago

here is a barebones example to illustrate some of the techniques mentioned:

boolean start = false;
int size = 0;
int startTime;
void setup() {
reset();
}
void draw() {
background(255);
if (start) {
size++;
noFill();
ellipse(width/2, height/2, size, size);
int time = millis() - startTime; // time since last click
if (time > 2500) {
fill(0);
text("finished", 20, 50);
}
}
else {
fill(0);
text("Click to start", 0, 10);
}
}
void mousePressed() {
start = true;
startTime = millis();
reset();
}
void reset() {
size = 0;
}

amanda_23

Re: How to to save the time of an event such as mousePressed?

1 year ago

Thank you so much, that's exactly what I was trying to do :)

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