Change array variable with ControlP5

Contributed Library Questions

jimmij

Change array variable with ControlP5

in Contributed Library Questions • 2 years ago

Hello world!

i have lots of array variables boxsize[1], boxsize[2], boxsize[3] etc.

and I want to change these vars with controP5 slider.

I tried something like this

for (int i=0;i<n;i++) {
controlP5.addSlider("boxsize["+i+"]",1,20);
}

but it's not working. Any suggestions?

Replies(2)

calsign

Re: Change array variable with ControlP5

2 years ago

Don't know too much about controlP5, but if you need to send a String to the addSlider, what you have will not work. Try:
controlP5.addSlider(boxsize[i], 1, 20);
Which will make the String equal to boxSize[i].
(You may have to cast or convert to a String using (String) to cast or String(toChange) to convert)
To say something like "Boxsize: <boxSize[i]>" you need to have:
"Boxsize: " + boxSize[i]
for the String.

andreas.s..

Re: Change array variable with ControlP5

2 years ago

hi, controlP5 can only detect non-array variables inside your sketch. therefore a little workaround is required using ids, see example below:

import controlP5.*;
float[] boxsize;
ControlP5 controlP5;
void setup() {
size(400, 400);
controlP5 = new ControlP5(this);
boxsize = new float[] {
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
};
for (int i=0;i<boxsize.length;i++) {
Slider s = controlP5.addSlider("boxsize"+i, 1, 20);
s.setValue(boxsize[i]);
s.setId(i);
}
}
void draw() {
background(0);
fill(255, 100);
for (int i=0;i<boxsize.length;i++) {
rect(10 +i*20, height, 19, -boxsize[i]*10);
}
}
void controlEvent(ControlEvent theEvent) {
if (theEvent.isController()) {
// check if theEvent is coming from a boxsize controller
if (theEvent.controller().name().startsWith("boxsize")) {
// get the id of the controller and map the value
// to an element inside the boxsize array.
int id = theEvent.controller().id();
if (id>=0 && id<boxsize.length) {
boxsize[id] = theEvent.value();
}
}
}
}

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