Problem with class

Programming Questions

alex_pr

in Programming Questions • 5 months ago

I am new to Processing and I can't find the reason why my code cannot enter the class....

Here's the whole code:

float x = 159, y = 158, d1 = 30, d2 = 30;
boolean enter;
int i2=0, j2=0;
void setup() {
size(700, 700);
background(255, 255, 255);
polygon(12, 350, 350, 300);
polygon(12, 350, 350, 260);
fill(252, 175, 8);
ellipse(x, y, d1, d2);
}
void polygon(int n, float cx, float cy, float r)
{
println("polygon");
float angle = 360/n;
beginShape();
if (r == 300) {
fill(208);
}
else fill(255, 255, 255);
for (int i = 0; i < n; i++)
{
vertex(cx + r * cos(radians(angle * i)),
cy + r * sin(radians(angle * i)));
}
endShape(CLOSE);
}
class Sphere
{
float x;
float y;
int d1;
int d2;
Sphere(float x, float y, int d1, int d2) {
x = 159;
y = 158;
d1 = 30;
d2 = 30;
}
void draw() {
println("draw");
fill(252, 175, 8);
ellipse(159, 158, 30, 30);
move();
display();
}
void move () {
println("move");
if (mousePressed) {
for (int i = i2; i < 12; i++) {
delay(300);
i2 = i;
x = 350 + 280 * cos(radians(30 * i));
y = 350 + 280 * sin(radians(30 * i));
for (int j = j2; j < sqrt(pow(x,2)+pow(y,2)); j++) {
j2 = j;
x = x+1.5;
y = y+1;
}
}
}
}
void display() {
println("display");
fill(252, 175, 8);
ellipse(x, y, d1, d2);
}
}

As you can see I have put a println after each void so that I can know which void it actually goes to. The problem is that the program does not write draw or move or display.

Any help is appreciated !!!

Replies(4)

pauline303

Re: Problem with class

5 months ago

several problems:
You don't instantiate Sphere. draw method is in the Sphere class, and it shouldn't be

float x = 159, y = 158, d1 = 30, d2 = 30;
boolean enter;
int i2=0, j2=0;
Sphere tak;
void setup() {
size(700, 700);
background(255, 255, 255);
polygon(12, 350, 350, 300);
polygon(12, 350, 350, 260);
fill(252, 175, 8);
ellipse(x, y, d1, d2);
tak = new Sphere( 120, 90, 2, 2);
}

void draw() {
println("draw");
fill(252, 175, 8);
ellipse(159, 158, 30, 30);
tak.move();
tak.display();
}
void polygon(int n, float cx, float cy, float r)
{
println("polygon");

float angle = 360/n;

beginShape();

if (r == 300) {
    fill(208);
}
else fill(255, 255, 255);

for (int i = 0; i < n; i++)
{
    vertex(cx + r * cos(radians(angle * i)),
    cy + r * sin(radians(angle * i)));
}
endShape(CLOSE);
}

class Sphere
{
float x;
float y;
int d1;
int d2;

Sphere(float x, float y, int d1, int d2) {
    x = 159;
    y = 158;
    d1 = 30;
    d2 = 30;
}

void move () {
    println("move");
    if (mousePressed) {
      for (int i = i2; i < 12; i++) {
        delay(300);
        i2 = i;
        x = 350 + 280 * cos(radians(30 * i));
        y = 350 + 280 * sin(radians(30 * i));
        for (int j = j2; j < sqrt(pow(x,2)+pow(y,2)); j++) {
          j2 = j;
          x = x+1.5;
          y = y+1;
        }
      }
    }
}

void display() {
    println("display");
    fill(252, 175, 8);
    ellipse(x, y, d1, d2);
}
}

PhiLho

Re: Problem with class

5 months ago

Also, the call to delay() is useless.
See I display images in sequence but I see only the last one. Why?

alex_pr

Re: Problem with class

5 months ago

Thank you both for your replies, they really helped and worked fine !!!

But now I have another problem : inside the class, the move and display voids won't draw anything......

Any ideas ???

float i=0, j=0, x2, y2;
Sphere tak;
void setup() {
size(700, 700);
background(255, 255, 255);
polygon(12, 350, 350, 300);
polygon(12, 350, 350, 260);
tak = new Sphere( 159, 158, 30, 30);
}
void draw() {
println("draw");
tak.move();
tak.display();
}
void polygon(int n, float cx, float cy, float r)
{
float angle = 360/n;
beginShape();
if (r == 300) {
fill(208);
}
else fill(255, 255, 255);
for (int i = 0; i < n; i++)
{
vertex(cx + r * cos(radians(angle * i)),
cy + r * sin(radians(angle * i)));
}
endShape(CLOSE);
}
class Sphere
{
float x;
float y;
int d1;
int d2;
Sphere (float x, float y, int d1, int d2) {
x = 159;
y = 158;
d1 = 30;
d2 = 30;
}
void move () {
if (j+10 >= sqrt(pow(x, 2)+pow(y, 2))) {
j = 0;
}
if (j+10 < sqrt(pow(x, 2)+pow(y, 2))) {
j++;
}
if (i+1 == 13) {
i = 0;
}
if (i+1 < 13) {
i++;
}
x = 350 + 280 * cos(radians(30 * i));
y = 350 + 280 * sin(radians(30 * i));
println("move");
x = x + 10.5;
x2 = x;
y = y + 1;
y2 = y;
}
void display() {
println("display");
fill(252, 175, 8);
ellipse(x2, y2, d1, d2);
print(x2);
print(" ");
println(y2);
}
}

PhiLho

I made some little changes, some are cosmetic, others are important.
Among the important ones: most Processing sketches redraw the whole scene one each frame.
So I moved the background() call and the polygon drawing inside draw().
Also, in the constructor of the Sphere, you were assigning values to the parameters of the constructor, not to the fields (the former hide the latter!) so the fields remained at zero.

float i, j, x2, y2;
Sphere tak;
void setup() {
size(700, 700);
tak = new Sphere(159, 158, 30, 30);
}
void draw() {
println("draw");
background(255);
polygon(12, 350, 350, 300);
polygon(12, 350, 350, 260);
tak.move();
tak.display();
}
void polygon(int n, float cx, float cy, float r)
{
float angle = 360/n;
beginShape();
if (r == 300) {
fill(208);
}
else fill(255, 255, 255);
for (int i = 0; i < n; i++)
{
vertex(cx + r * cos(radians(angle * i)),
cy + r * sin(radians(angle * i)));
}
endShape(CLOSE);
}
class Sphere
{
float x;
float y;
int d1;
int d2;
Sphere(float x, float y, int d1, int d2) {
this.x = x;
this.y = y;
this.d1 = d1;
this.d2 = d2;
}
void move () {
if (j+10 >= sqrt(pow(x, 2)+pow(y, 2))) {
j = 0;
}
if (j+10 < sqrt(pow(x, 2)+pow(y, 2))) {
j++;
}
if (i+1 == 13) {
i = 0;
}
if (i+1 < 13) {
i++;
}
x = 350 + 280 * cos(radians(30 * i));
y = 350 + 280 * sin(radians(30 * i));
println("move");
x += 10.5;
x2 = x;
y++;
y2 = y;
}
void display() {
println("display");
fill(252, 175, 8);
ellipse(x2, y2, d1, d2);
print(x2 + " " + y2);
}
}

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