hello guys,

started with a german book called “generative gestaltung” and I stucked with a thing in the code.
Unfortunately it isn't mentioned in the book. Its a very small thing, but i don't get it:
http://www.openprocessing.org/sketch/61018
How works this randomSeed thing? I don‘t understand :/

Thanks!

new questions below.


boolean animationIsRunning = true;

color black = color(#000000);
int size = 1000; // width, height
int grid = 10; // number of grids
int s = 0; // standard index of rect-color

color[] cc = new color [3];
color[] colorsave = new color[500];

int[] coorX = new int[grid];  // coordinates of possible random fields
int[] coorY = new int[grid];  // coordinates of possible random fields

Lottery myLottery = new Lottery();


void setup () {

  cc[0] = #FF0000;
  cc[1] = #00FF00;
  cc[2] = #0000FF;
  
  

  size (size, size);
  background (black);
  frameRate(40);
  myLottery.drawGrids(15);

  for (int i = 0; i * (size/grid) < size; i++) {
    coorX[i] = i *  (size/grid);
    coorY[i] = i *  (size/grid);
  }
}

void draw () {

  int rando1 = int (random(coorX.length)); // rando = random number from array coor
  int rando2 = int (random(coorY.length));
  
      noStroke(); 
      tint(0, 0, 255);
      fill(cc[s], 10); 
      rect(coorX[rando1], coorY[rando2], size/grid, size/grid);
      
  if (keyPressed) {  

    if (key == '0') {  
      background(black);
    }

    if (key == 'r') {
    s = 0;  
    }

    if (key == 'g') { 
    s = 1;   
    }

    if (key == 'b') {
    s = 2;    
    }
    
   else {
    s=0;
   } 
  }
} // end draw


void mouseReleased() {

  animationIsRunning = !animationIsRunning;

  if (animationIsRunning) {
    loop();
  } 
  else
  {
    noLoop();
  }
}


class Lottery {

  void drawGrids(int transparency) {

    for (int i = 1; i * (size/grid) < size; i++) {

      if (i * (size/grid) < size) {

        int x = i *  (size/grid);
        int y = i *  (size/grid);

        // stroke(#FFFFFF, transparency);     
        line (x, 0, x, size);
        line (0, y, size, y);
      } // if-condition
    } // for-loop
  } // drawGrids
  
  

} // end lottery

hi,
I need your help again, I don't get the behaviour of arrays here.

1. int[] xpos = new int[70];
   int[] ypos = new int[70];
    
   void setup(){
     size(500, 200);
     smooth();
     noStroke();
   }
    
   void draw(){
     background (255);
    
   
     for (int i=0; i< xpos.length - 1; i++) {
       xpos[i] = xpos[i + 1];
       ypos[i] = ypos[i + 1];
     }
      
     xpos[xpos.length - 1] = mouseX;
     ypos[xpos.length - 1] = mouseY;
    
   
     for (int i=0; i < xpos.length; i++) {
       fill (0, 0, 0, 25);
       ellipse (xpos[i], ypos[i], i / 0.75, i / 0.75);
     }
   }

I don't understand how the xpos and ypos-thing works.

1.   for (int i=0; i< xpos.length - 1; i = i + 1) {
       xpos[i] = xpos[i + 1];
       ypos[i] = ypos[i + 1];
     }
   
    xpos[xpos.length - 1] = mouseX;
     ypos[xpos.length - 1] = mouseY;

 
For my understanding this code effects:

xpos[0] = 1
xpos[1] = 2  
xpos[2] = 3  
xpos[3] = 4  

[…]

xpos[29] = mouseX;


I cant comprehend why all my bubbles are following my mouse?
For me xpos[0-28] are static values and just the last value (29) is able
to follow my mouse.

Please help me, i struggle with this for hours. -,-

—

I'm also very thankful for correcting my english sentences, it's very appreciated!

hi,
i'm trying that my ellipses are losing their transparency every turn (what's the correct term for it?),
but i dont get my while-loop working.

1. void setup() {
     colorMode(HSB, 255);
     size(400, 400);
     background(0);
     smooth();
     frameRate(60);
    
    
   }
   
   void draw() {
   
   color rc = round (random (255)); // random color
   float rx = random (width); // random x-position of ellipse
   float ry = random (height); // random y-position of ellipse
   float d = random (10,120); // width/height of ellipse
   
   int t = 100; // transparency of ellipse
   
   while (t >= 0) {
    kreis(rc, rx, ry, d, t);
   t = t - 5;
   }
   
   }
   void kreis (color rc, float rx, float ry, float d, int t) {
     noStroke();
     fill(rc, rc, rc, t);
     ellipse(rx, ry, d, d);
     noFill();
     stroke(rc, rc, rc, t);
     ellipse(rx, ry, 4+d, 4+d);
   }
   

What‘s wrong? Thank you!

Hi!
I need your help.

I created this code:

1.     void setup() { 
           size(400, 400); 
           smooth();         
       } 
    
       void draw() { 
           background(255);
        
         float mX = mouseX;
         float mY = mouseY; 
        
         fill (#F7C502);
         rect (0, 0, mX, mY);
   
            for (int y = 0; y < mouseY; y = y + 5) { 
               line(0, y, width, y); 
       }  
             for (int x = 0; x < mouseX; x = x + 5) { 
               line(x, 0, x, height); 
       }  
   
   }
   

I have the plan that my rect (filled with #F7C502) fits in my mouseX/Y-grid.
So i have to tell my rect that it should only work if mouseX or mouseY is divisible by 5.
If the coordinate – for example 23 – isnt divisible by 5, the rect should go back to 20.
Can you tell me how to code this or is there a better way to get to my aim?
Thx!

hi,
i need your help, i dont understand why this won't work.
I tried to have random-colored circles in a row, but my code
won't work with my variables r and r1.

1. float r;
   float r1;
   
   void setup() {
   float r = random(255);
   float r1 = random(50, 100);
   }
   
   void draw() {
   int i = 0;
   
   while (i <= width) {
     fill(0, r, r1, 50);
     ellipse(i, height/2, 70, 70);
     i = i + 40;
   }

If I edit fill(0, r, r1, 50);
to
  fill(0, random(255), random(50, 100), 50);

I get exactly what i want (with the exception that my ellipses are drawn new every frame). I don't understand
why my ellipses are black-colored if if use my variables r and r1.

Can you help me to understand this?
For my understanding r and r1 are set once random but this isn't the case.

Thanks!

1. float x;
   float y;
   int s = 10;
   
   void setup() {
     size(400, 400);
     background(255, 245, 245);
     smooth();
     noStroke();
   
     x = width/2;
     y = height/2;
   }
   
   void draw() {
     fill(200, 0, 0, 10);
     x = x + random(-5, 5);
     y = y + random(-5, 5);
    
     x = constrain(x, 0, width);
     y = constrain(y, 0, height);
    
     ellipse(x, y, s, s);
   }
   
   
   

 
Hi guys,
i need your help. I'm a newbie and im learning processing for a week. I solved
many understanding problems with the time by my own but here is a tutorial-code I don't get.

Why does this code start with:

1. float x; float y; int s = 10;

??

I have no clue why I can't put this part with …

1.  x = width/2;
2.  y = height/2;

… in the void draw() block?


Thanks for your help!