Variable based on instance of class (unsure of correct terminology)

tomrbland

Variable based on instance of class (unsure of correct terminology)

in Contributed Library Questions • 6 months ago

TL;DR - when I call a new class, labels are being overwritten because they have the same name. How can I give a label a name dependent on the class instance?

Hi,

I come from the world of microprocessors so the whole class thing is still something of a mystery to me!

I'm trying to create a program that will have a few windows displaying fairly similar data (received from a pic). At the moment I have this:

void setup(){
//set window dimensions
size(700,300);
controlP5=new ControlP5(this);
l1_data = new Data(50, 70);
l2_data = new Data(220, 70);
}
void draw(){
background(125);
l1_data.shapes();
l2_data.shapes();
}

Data is this:

class Data{
int X, Y = 0;
Textlabel name, l1, l2, l3, N;
Data(int tempX, int tempY){
X = tempX;
Y = tempY;
stroke(255);
fill(80);
rect(X,Y,100,Y+100);
name = controlP5.addTextlabel("name_label","Distro 1",X+2,Y+2);
l1 = controlP5.addTextlabel("l1_label","L1",X+2,Y+15);
l2 = controlP5.addTextlabel("l2_label","L2",X+2,Y+30);
l3 = controlP5.addTextlabel("l3_label","L3",X+1,Y+45);
N = controlP5.addTextlabel("N_label","N",X+2,Y+60);
}
void shapes (){
stroke(255);
fill(80);
rect(X,Y,100,Y+100);
}
}

My question is how to I get "N_label" to be "l1_data_N_label" and "l2_data_N_label"? This is required because each label is overwritten when the next new instance is called.

I hope that makes sense.

Thank you for your time.

Tom

Replies(3)

Chrisir

Re: Variable based on instance of class (unsure of correct terminology)

6 months ago

I never saw textlabels created in a class but should be ok.

You could give each object a single ID (based on a global var which you increment)

class Data{
int X, Y = 0;
Textlabel name, l1, l2, l3, N;
int ID;

l1_data = new Data(50, 70, globalInt );
globalInt++;
l2_data = new Data(220, 70, globalInt );
globalInt++;

and make the constructor accordingly

then the name of the textlabel would be str(ID) + "l1_label"

OK?

tomrbland

Re: Variable based on instance of class (unsure of correct terminology)

6 months ago

Ahh, got it. Thank you. I'll give it a go.

I'm creating them in a class because I'm going to have quite a lot of similar data.

Thank you

PhiLho

Re: Variable based on instance of class (unsure of correct terminology)

6 months ago

" I hope that makes sense."
Not at all, until, by reading the code, I realized you were talking about controlP5 labels... That's why I moved the topic from the Programming Questions section...

Top Reply