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Index › Programming Questions & Help › Syntax Questions › new object, new variables
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new object, new variables? (Read 278 times)
berend
new object, new variables?
Jun 23rd, 2008, 1:14pm  
Hello,

i'm trying to make an ellipse, and after a while, there will be another ellipse. A sort of radar.
But my question is:
how can i create a new object with the same, but new variables. So that each object has it's own size.

Code:

cirkel c1 = new cirkel(0,0);
int i = 0;

void setup(){
  size(600,600);
  noFill();
  smooth();
  strokeWeight(2);
}

void draw(){
  background(255);
  c1.update();
}

class cirkel{
  float xpos,ypos;
  cirkel(float x, float y){
    xpos = x;
    ypos = y;
  }
  void update(){
    xpos = xpos + 1;
    ypos = ypos + 1;
    ellipse(mouseX,mouseY,xpos,ypos);
    if(xpos>=200){
	i = i + 1;
	cirkel i = new cirkel(0,0);
    }
  }
}


thanks
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PhiLho 
Re: new object, new variables?
Reply #1 - Jun 23rd, 2008, 2:03pm  
The redefinition of i (first integer, then object) is messy, at least... Plus the new object will die as soon as it is created.

I am not too sure of what you try to do. Concentric circles?
If so, create an array of cirkel objects:

Code:
int i = 0;
int MAX_C = 10; // Adjust
cirkel[] cl = new cirkel[MAX_C];

void draw() {
  if ((i == 0 || cl[i - 1].getWidth() > 200) && i < MAX_C) {
    cl[i++] = new cirkel(0, 0);
  }
  for (int k = 0; k < i; k++) {
    cl[k].update();
  }
}

class cirkel() {
[...]
void getWidth() {
  return xpos;
}
}

and drop the test and object creation in update().
I prefer to keep the control on the collection of classes outside of the class itself (or make a class for the collection).

Not tested...
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