Question

I’m working on an RTS style webapp in processingJS, meaning that there is a little minimap that represents a larger map, which the user can only see a small part of at any given moment. I just added the ability to use arrow keys to navigate the map, i.e.:

    void keyPressed(){
    if(key == CODED){
        switch(keyCode){
            case(UP): //go up
            case(DOWN): //go down , etc

However, I’d like to be able to let a user move diagonally by pressing a combination of two arrow keys. Right now, it seems like this is impossible to do, seeing as how “keyCode” can only seem to hold one value at a time.

Does anybody know any workarounds to this issue?

Best,
Sami

Answer 1

As @Xenethyl pointed to in his link in the comments, one way to get around this is by keeping tracks of when a key is pressed and then watching for when the key is released. It is safe to assume that a key is held down in the period of time in between those two events.