Question about a combination of keys being pressed

Programming Questions

canas007

Question about a combination of keys being pressed

in Programming Questions • 1 year ago

Hi. I'm fairly new to processing and I was wondering how to make a simple circle move diagonally. I can make it move up, down, right, and to the left, but not in a diagonal direction (ie. diagonally down and to the right).

I tried using an if statement and setting it to, for example, if (keyCode == DOWN && keyCode == RIGHT){ cX+=; cY+=2;}, but have had no success.

Can anyone tell me what I'm doing wrong? Thanks!

int page = 1;
float backgroundFill = 255;
int cX = 400;
int cY = 400;
void setup(){
size(800,800);
}
void draw(){
background(backgroundFill);
// if (page == 1){
// }
displayC();
moveC();
//displayE();
//moveE();
//areaSize();
}
void displayC(){
ellipse(cX,cY,10,10);
}
void moveC(){
if (key == CODED && keyPressed == true) {
if (keyCode == UP) {
cY-=2;
}
}
if (key == CODED && keyPressed == true) {
if (keyCode == DOWN) {
cY+=2;
}
}
if (key == CODED && keyPressed == true) {
if (keyCode == RIGHT) {
cX+=2;
}
}
if (key == CODED && keyPressed == true) {
if (keyCode == LEFT) {
cX-=2;
}
}
if (key == CODED && keyPressed == true) {
if (keyCode == DOWN && keyCode == RIGHT){
cX+=2;
cY+=2;
}
}
if (key == CODED && keyPressed == true){
if (keyCode == UP && keyCode == RIGHT){
cY-=2;
cX+=2;
}
}
if (key == CODED && keyPressed == true) {
if (keyCode == DOWN && keyCode == LEFT){
cX-=2;
cY+=2;
}
}
if (key == CODED && keyPressed == true) {
if (keyCode == UP && keyCode == LEFT){
cX-=2;
cY-=2;
}
}
}

Replies(2)

hellochar

Re: Question about a combination of keys being pressed

1 year ago

keyCode only keeps track of the most recent key that was pressed, so if you press UP and then LEFT keyCode will only be LEFT. In general variables can only have one value at a time. What you can do is keep an array or a set of keys that are currently being pressed, and then check those keys to activate movement.

PhiLho

Re: Question about a combination of keys being pressed

1 year ago

That's a FAQ, that I think it is answered in the Wiki, and several times in the forum. Hint: you have to use a boolean for each directional key.
Additional hint: you can make the test for key coded and pressed once for all the keys, and do test the kind of key inside.

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