Accepting input from the same key twice

Programming Questions

.feda

Accepting input from the same key twice

in Programming Questions • 2 years ago

I need to move a rectangle by pressing a key, but i need it to happen twice using the same key.

So i say use something like:

void keyPressed(){

if (key == ' '){

rect(pos_x, pos_y--, rect_width, rect_height);

}

How can i call this more than once using the same key?

Replies(6)

PhiLho

Re: Accepting input from the same key twice

2 years ago

The code is called each time the key is pressed. So I don't see what is the problem, exactly.

.feda

Re: Accepting input from the same key twice

2 years ago

OK i see I can accept from the same key more than once. What I really meant was how can I get an event to happen twice if it uses the same variables.

void keyPressed(){

if (key == ' '){

rect(pos_x, pos_y--, rect_width, rect_height);

}

Here I'm using the space key to move a rect up the screen, but what I want to happen is to move another rect the same way when I press space again. Do I have to use seperate values to do this (ie. pos_x for the first rect, pos_x2 for the second) or is there an easier way?

PhiLho

Re: Accepting input from the same key twice

2 years ago

Yes, you have to have separate values, if their positions are independent. If the number of rect grows, you can use an array.

acwood91

Re: Accepting input from the same key twice

1 year ago

I am having this same issue myself what I'd like to do is have it so once the 'm' key is pressed = something happens, once the 'm' key is pressed a second time = something else happens

monkstone

Re: Re: Accepting input from the same key twice

1 year ago

If you want to something really fancy such as ordered state transitions it might be worth looking at building a state machine see example http://www.javacodegeeks.com/2011/07/java-secret-using-enum-to-build-state.html . Unfortunately it is not very processing ide friendly (you will need to create the enums in *.java files instead of *.pde files).

quarks

Re: Accepting input from the same key twice

1 year ago

Have another variable keep track of the number of times the 'm' key is pressed and use that variable to determine what happens e.g.

int m_count = 0;
void keyPressed(){
if (key == 'm '){
m_count++;
if(m_count == 1){
rect(pos_x, pos_y--, rect_width, rect_height);
}
else if(m_count == 2){
// do something different
}
else { // for all values > 2
// do something else
}
}
}

Changing the basic logic will enable you to flip between actions or repeat a series of actions for the same key.

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