problem writing my first class

Programming Questions

mioclonic

problem writing my first class

in Programming Questions • 1 years ago

Dear all,

I'm having a problem writing my first class, I'm new to processing and I can't understand what I'm doing wrong.

This is what I want to do with my object

import processing.pdf.*;
PShape jup01;
float bx;
float by;
float bs = 50;
boolean bover = false;
boolean locked = false;
boolean attivo = false;
boolean record;
float bdifx = 0.0;
float bdify = 0.0;
float a = 0.0;
float s = 0.0;
int value = 0;
void setup() {
size(800, 500);
bx = 20;
by = 20;
smooth();
jup01 = loadShape("jup01.svg");
println(mouseX);
}
void draw(){
background(255);
if(record) {
beginRaw(PDF, "jupiter.pdf");
}
if (mouseX > bx && mouseX < bx+bs &&
mouseY > by && mouseY < by+bs) {
bover = true;
}
else {
bover = false;
}
//shape(jup01,bx,by,bs,bs);
scala();
stampa();
if(record) {
endRaw();
record = false;
}
}
void mousePressed() {
if(bover) {
locked = true;
} else {
locked = false;
}
bdifx = mouseX-bx;
bdify = mouseY-by;
}
void mouseDragged() {
if(locked) {
bx = mouseX-bdifx;
by = mouseY-bdify;
}
}
void mouseReleased() {
locked = false;
}
void keyPressed() {
if (key == CODED) {
if (keyCode == CONTROL) {
attivo = true;
}
} else {
attivo = false;
}
}
void keyReleased() {
if (value == 0) {
attivo = false;
} else {
value = 0;
}
}
void scala(){
if(attivo&locked) {
float zoom = mouseX-bx;
if(zoom > 50){
bs=zoom;
}
else {
bs=50;
}
shape(jup01,bx,by,bs,bs);
}
else {
shape(jup01,bx,by,bs,bs);
}
}
void stampa(){
if(keyPressed) {
if (key == 'P' || key == 'p') {
record = true;
} }}

And this is what I've done since now.. I can create the objects but they are not doing what I want.

icona icona1;
icona icona2;
void setup() {
size(800, 500);
smooth();
icona1 = new icona (loadShape("jup01.svg"),10.,10.,50.);
icona2 = new icona (loadShape("jup02.svg"),10.,50.,50.);
}
void draw(){
background(255);
icona1.display();
icona2.display();
}
class icona {
PShape jup_icona;
float bx;
float by;
float bs = 50;
boolean bover = false;
boolean locked = false;
boolean attivo = false;
boolean record;
float bdifx = 0.0;
float bdify = 0.0;
float a = 0.0;
float s = 0.0;
float value;
char nome;
icona(PShape tempnome,float tempbx, float tempby, float tempbs){
jup_icona=tempnome;
bx=tempbx;
by=tempby;
bs=tempbs;
}
void display(){
if (mouseX > bx && mouseX < bx+bs &&
mouseY > by && mouseY < by+bs) {
bover = true;
}
else {
bover = false;
}
if(attivo&locked) {
float zoom = mouseX-bx;
if(zoom > 50){
bs=zoom;
}
else {
bs=50;
}
shape(jup_icona,bx,by,bs,bs);
}
else {
shape(jup_icona,bx,by,bs,bs);
}
}
void mousePressed() {
if(bover) {
locked = true;
} else {
locked = false;
}
bdifx = mouseX-bx;
bdify = mouseY-by;
}
void mouseDragged() {
if(locked) {
bx = mouseX-bdifx;
by = mouseY-bdify;
}
}
boolean mouseReleased() {
return locked = false;
}
void keyPressed() {
if (key == CODED) {
if (keyCode == CONTROL) {
attivo = true;
}
} else {
attivo = false;
}
}
void keyReleased() {
if (value == 0) {
attivo = false;
} else {
value = 0;
}
}
}

Any suggestion?

Thank you very much!

Replies(2)

amnon.owed

Re: problem writing my first class

1 years ago

Check out: http://processing.org/learning/objects/

PhiLho

Re: problem writing my first class

1 years ago

You know, it is hard to answer: because the code is long and not well indented, it is hard to analyze visually. Because it uses not provided files (SVG), it is hard to test (we don't know the size of the SVG). And you don't tell what doesn't work.
Well, today I have some time, so I replaced the SVG files with one I have, showing a chess piece. And I reformatted with Ctrl+T.

I can see the problem: the pieces no longer move when dragged.
And I can see one cause: you moved the functions called by Processing, like mouseDragged, inside the class. But there, Processing cannot see them, so it won't call them.
One solution is to keep them outside of the class, and make them to call the methods inside the class of each object. (An alternative is to register the methods, but that's a bit less documented.)
Eg.:
void mousePressed() {
for (icona icon : iconaArray) {
icon.mousePressed();
}
}
supposing you have an array of icona objects, named iconaArray. Can also be an ArrayList, if the number of icona objects can vary.

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