Help needed please in code

Processing Coding Questions
1

Within setup and main. I am creating a pg graphics at x,y resolution, placing a value in centre. Then randomly choosing a point. If the point = centre then x,y found.

Wth am I doing wrong??

PGraphics pg;

float col=10;

int count=0;

int xsize=1500;
int ysize=500;
int tempx;
int tempy;
int temppixel;
float pixheight;

int pixel;

void setup(){
size(1500, 500);
noSmooth();
colorMode(RGB,255);
pg=createGraphics(xsize, ysize);
pg.noSmooth();
pg.beginDraw();
pg.background(0,0,0);
pg.loadPixels();
pg.fill(255);
pg.strokeCap(SQUARE);
frameRate(1);

int px=xsize/2;
int py=ysize/2;
pixel=(px+(py*xsize));
pg.pixels[pixel] = color(200,200,200);

positionchange();

}

void draw(){
pg.colorMode(RGB,255);
pg.beginDraw();
pg.updatePixels();
image(pg,0,0,1500,500);
}

void positionchange(){
tempx=int(random(1,xsize));
tempy=int(random(1,ysize));
temppixel=(tempx+(tempy*xsize));
pixheight=red(pg.pixels[temppixel]);

println(temppixel);

if (pixheight==0); {
positionchange();
}

}

2

you loop it too much. Find another way to do it.

3

How though?? It’s sooooo simple but can’t think how ???

4

But it has to be looped until the centre point is found

5

Code in other language:

position:

randomize

x=(int(rnd(xmax)))

y=(int(rnd(ymax)))

get pixel x,y color r2,g2,b2

if r2=0 then goto position

return

6

you need to add a way to find if the pixel has been checked yet.
image
What I am trying to signal in this image is that you go over the previously checked squares. In results in an infinite loop

7

Why is something so difficult so hard within Processing!! ??

Ok.
Using PG graphics.
Everything is black apart from middle point.

Go to a routine that randomly finds that point and re-iterates till it’s done.

Once done, display the point found (middle) on screen.