function interrupt draw

Core Library Questions

helene4mod

in Core Library Questions • 8 months ago

I have create an application which read a video and where the speed can be modified by event "keyPressed".

This works well but when I press several times the key, the method draw seems stop and my movie in pause until the event endding.

How to solve this problem of interrupt ? How I can reduce the time of the interrupt fonction ?

This is my sketch :

import processing.video.*;
Movie mov;
float speed;
void setup() {
size(480, 390);
frameRate(50);
mov = new Movie(this, "myvideo.mov");
mov.play();
speed=0.5;
}
void draw() {
background(255);
fill(255);
mov.speed(speed);
image(mov, 90, 90, 390, 390);
fill(0);
text( "speed : " + speed, 10, 30);
if((mov.duration())-(mov.time())<0.1 && speed>0){
println("fin video "+mov.time()+"mov.duration : "+(mov.duration()));
mov.jump(0);
}
if(speed<0 && (mov.time()-0)<0.1){
println("fin video "+mov.time());
mov.speed(abs(speed));
mov.jump(mov.duration());
}
}
// Called every time a new frame is available to read
void movieEvent(Movie m) {
m.read();
}
void keyPressed() {
if (key == CODED) {
if (keyCode == LEFT) {
speed = speed -0.1;
} else if (keyCode == RIGHT) {
speed = speed+0.1;
}
}
}

Replies(1)

GoToLoop

Re: function interrupt draw

8 months ago

You haven't coded a way to check & restrict minimum & maximum values for variable speed.
So a user of your app has free rein to bug it in a matter of key presses!

Here's your function keyPressed() w/ additional check for speed:

final static float minSpd = .1, maxSpd = 10;
final static float incSpd = .1;

void keyPressed() {

  if (keyCode == LEFT)         speed -= incSpd;
  else if (keyCode == RIGHT)   speed += incSpd;

  if (speed < minSpd)          speed = minSpd;
  else if (speed > maxSpd)     speed = maxSpd;
}

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