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Topic: Langtons ant and setPixel() problems... (Read 498 times) |
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gkoshra
 
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Langtons ant and setPixel() problems...
« on: Feb 20th, 2003, 3:03pm » |
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Hi, i'm pretty new to programming, most of the stuff i've done is fairly basic actionscripting, but i'm pretty keen to learn proce55ing as it seems like it's going to solve a lot of the issues I have with flash.
So, I thought i'd start simple and make a program to show this -> http://mathworld.wolfram.com/LangtonsAnt.html
It's a really simple concept, so I bashed together this code (which is horrible and inelegant I know, but I thought I could refine it into functions etc once it works)....
int antx = 200;
int anty = 200;
int direction = 0;
int wb = 0;
void setup()
{
size(400, 400);
framerate(10);
background(#FFFFFF);
}
void loop()
{
// color col = color(wb,wb,wb);
// setPixel(antx,anty,col);
if(getPixel(antx,anty)==(-1)){
//do stuff because it's a white pixel
direction--;
if(direction<0)
direction=3;
wb=0;
}
if(getPixel(antx,anty)!=(-1)){
//do stuff because it's a black pixel
direction++;
if(direction>3)
direction=0;
wb=255;
}
if((direction)==0)
anty--;
if((direction)==1)
antx++;
if((direction)==2)
anty++;
if((direction)==3)
antx--;
color col = color(wb,wb,wb);
point(antx,anty);
}
I've scouted about this forum and the reference docs to try and figure out what i'm doing wrong, and have come to the conclusion I need to have all the pixels in an array, is this right? If so, how do I make it work?
Thanks.
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gkoshra
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Re: Langtons ant and setPixel() problems...
« Reply #1 on: Feb 20th, 2003, 3:35pm » |
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I've just spotted a mistake, the last line is supposed to read...
setPixel(antx,anty,col);
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REAS
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Re: Langtons ant and setPixel() problems...
« Reply #2 on: Feb 20th, 2003, 4:49pm » |
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// color col = color(wb,wb,wb);
// setPixel(antx,anty, col);
you can also use:
stroke(wb);
point(antx, anty);
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gkoshra
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Re: Langtons ant and setPixel() problems...
« Reply #3 on: Feb 20th, 2003, 5:56pm » |
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Cheers for the info. I think that the problem lies with the rest of my program rather than just setting the pixels now, as even when I use point() to plot my colour, nothing still happens apart from a blob going round and round in circles.
*** thinks for a while ***
I think i've finally clicked that the reason I only have one blob at a time on screen is that I don't ever put the positions of the other blobs into an array to keep them there, is this correct?
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gkoshra
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Re: Langtons ant and setPixel() problems...
« Reply #4 on: Feb 21st, 2003, 3:09pm » |
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Me again, I finally figured out the problem (with the help of a programmer friend!) was that I was moving before I set the pixel I had left, so here's the new revised (and pretty much completely changed) code...
int antx = 100;
int anty = 100;
int direction = 0;
boolean wb = false;
boolean[][] mp = new boolean[200][200];
boolean wbset = false;
void setup()
{
size(200, 200);
background(#FFFFFF);
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++){
mp[x][y] = false;
}
}
void checkAnt (int x, int y, int col){
if(col==-1){
direction--;
if(direction<0)
direction=3;
wb=true;
}
if(col!=-1){
direction++;
if(direction>3)
direction=0;
wb=false;
}
mySetPixel(antx,anty,wb);
if((direction)==0)
anty--;
if((direction)==1)
antx++;
if((direction)==2)
anty++;
if((direction)==3)
antx--;
}
void refresh() {
for (int x = 0; x < width; x++)
for (int y = 0; y < height; y++)
setPixel(x, y, mp[x][y] ? color(0,0,0) : color(255,255,255));
}
void mySetPixel(int x, int y, boolean set)
{
mp[x][y] = set;
setPixel(x, y, set ? color(0,0,0) : color(255,255,255));
}
boolean myGetPixel(int x, int y)
{
return mp[x][y];
}
void loop()
{
refresh();
checkAnt(antx,anty,getPixel(antx,anty));
}
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gkoshra
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I know it seems like i'm talking to myself but....
« Reply #5 on: Feb 24th, 2003, 9:54am » |
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I realised that if you use noBackground(); then the screen doesn't get cleared every frame and I don't need to put all the pixels into an array and redraw it every frame! Anyway, it's not very exciting, but I did some nicer things which i'll post somewhere else.
int antx = 100;
int anty = 100;
int direction = 0;
boolean wb = false;
void setup()
{
size(200, 200);
noBackground();
}
void checkAnt (int x, int y, int col){
if(antx>199){
antx=0;
}
if(antx<0){
antx=199;
}
if(anty>199){
anty=0;
}
if(anty<0){
anty=199;
}
if(col==-1){
direction--;
if(direction<0)
direction=3;
wb=true;
}
if(col!=-1){
direction++;
if(direction>3)
direction=0;
wb=false;
}
mySetPixel(antx,anty,wb);
if((direction)==0)
anty--;
if((direction)==1)
antx++;
if((direction)==2)
anty++;
if((direction)==3)
antx--;
}
void mySetPixel(int x, int y, boolean set)
{
setPixel(x, y, set ? color(0,0,0) : color(255,255,255));
}
void loop()
{
checkAnt(antx,anty,getPixel(antx,anty));
}
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