Can I use keyPressed() and get the affects to stay

Programming Questions

nfeldbaum

Can I use keyPressed() and get the affects to stay

in Programming Questions • 1 year ago

Hi,

Is it possible to use keyPressed (and then key ==) and get what happens to stay on the screen? For example:

if (keyPressed)
    {
      if (key == 'o')
      {
        image(img4,x,mouseY);
        x--;
      }

Can I get the image to stay on the screen and to keep moving?

Replies(2)

benja

Re: Can I use keyPressed() and get the affects to stay

1 year ago

The variable "key" always holds the last key that has been pressed. Example:

void setup(){}

void draw(){
if(key == 'o')
background(255, 0, 0);
else
background(0, 0, 0);
}

If you want to use other keys as well, you would have to store use a variabel to store, that a certain key has already been pressed. Here is an example where 'o' toggles the background-color:

boolean oPressed;

void setup(){}

void draw(){
if(oPressed)
background(255, 0, 0);
else
background(0, 0, 0);
}

void keyPressed(){
if(key == 'o')
oPressed = !oPressed;
}

calsign

Re: Can I use keyPressed() and get the affects to stay

1 year ago

Ah! Mere seconds!

Try creating a global boolean, setting that to true, and then checking for that in draw():

boolean imageVisible; //The variable
void setup() {
size(400, 400);
//Load image and do other stuff
}
void draw() {
if(imageVisible) { //Check the variable
image(img4, x, mouseY);
x --;
}
}
void keyPressed() {
if(key == 'o') {
imageVisible = true;
}
}

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