Working with classes

Programming Questions

sarah234

in Programming Questions • 2 years ago

I am new in processing and I have written a code but it dont work. I followed a lot of tutorails but I dont know what is wrong with my code.

Can someone look at the code and tell me what I do wrong.

Here is the code:

// DECLARE

tekst1 mijntekst1;

void setup() {

size(600,600);

// INITIALTIE

tekst1 = new tekst1;

}

void draw() {

background(255);

// FUNCTIONALLITY

mijntekst1 runtekst1 ();

}

class tekst1 {

// GLOBAL

int x = 30;

PFont fontA;

// CONSTRUCTORS

tekst1 ();

// FUNCTIONS

void runtekst1() {

// Load de font. Tools > Create Font

fontA = loadFont("Arial-BoldMT-16.vlw");

// de font en de grootte van het lettertype

textFont(fontA, 16);

fill (0);

text("Just a example", x, 60);

text("This is a very long text. dkdkdk jfjsloe skdjf enz it goes on and on and on and the text blabla", x, 200, 540,400);

}

Replies(3)

anchnk

Re: Working with classes

2 years ago

Hi, you made several common mistakes when starting with OOP.

To instanciate your object, what you called INITIALTIE, the correct syntax is (asuming your constructor hasn't any parameters):

mijntekst1 = new tekst1();

Then, in draw to call the main method of your class just use :

mijntekst1.runtekst1();

Now in your class, you should load the font only once, that means move fontA = loadFont... in your constructor. That can be the same for everything you just need to set once at your object creation. So you can move textFont and fill too in the constructor.

Hope that helps to get you gettintg started.
And look again at the examples and tutorials, your code show that you missed some important concepts.
That's not getting easy as start but once figured out it's really easy.

veeableful

Re: Working with classes

2 years ago

Here, it should have no problem now. I added comments on the parts that caused errors. I merely made it runnable but do follow the advice above as well.

// DECLARE
tekst1 mijntekst1;
void setup() {
size(600, 600);
// INITIALTIE
mijntekst1 = new tekst1(); // Use the variable name, not the type. Also, don't forget the parenthesis
}
void draw() {
background(255);
// FUNCTIONALLITY
mijntekst1.runtekst1(); // Use a dot notation to access that object's method
}
class tekst1 {
// GLOBAL
int x = 30;
PFont fontA;
// CONSTRUCTORS
tekst1 () { // Add curly braces or just have no constructor at all if you aren't initializing anything
}
// FUNCTIONS
void runtekst1() {
// Load de font. Tools > Create Font
fontA = loadFont("Arial-BoldMT-16.vlw");
// de font en de grootte van het lettertype
textFont(fontA, 16);
fill (0);
text("Just a example", x, 60);
text("This is a very long text. dkdkdk jfjsloe skdjf enz it goes on and on and on and the text blabla", x, 200, 540, 400);
}
}

sarah234

Re: Working with classes

2 years ago

Thank you

it is fixed

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