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Topic: More Brownian Stuff (Read 994 times) |
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gkoshra
 
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More Brownian Stuff
« on: Jun 3rd, 2003, 11:00am » |
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Hello,
I've been trying figuring out classes, and I like them. So I re-made an old program using them. You can see it here -> http://gomako.co.uk/p5/brownies/
I added a bit so that you could clear areas of the screen for the 'brownies' to re-conquer. I thought it'd be relatively simple, but if you try and draw for a while, it starts doing all kinds of crazy stuff, then crahses with an 'ArrayIndexOutOfBounds Exception: -1'
It highlights boofs[i].draw(); when it crashes.
Here's the code...
Code:
// Mucking about with classes and brownies
int w = 600; // width
int h = 400; // height
int numBoofs = 2000; // how many boofs - or brownies, whatever
Boof[] boofs = new Boof[numBoofs]; // sets up array
void setup() {
size(w, h);
noBackground();
ellipseMode(CENTER_RADIUS);
myRefresh();
// creates the objects
for(int i=0; i<numBoofs; i++) {
boofs[i] = new Boof();
}
}
void loop() {
for(int i=0; i<numBoofs; i++) {
boofs[i].update();
boofs[i].draw();
}
}
/////////////////////////////////////////
/////////////////////////////////////////
class Boof
{
int r = int(random(153,174));
int g = int(random(134,176));
int b = int(random(51,85));
int xpos = int(random(width));
int ypos = int(random(height));
void update()
{
stroke(r,g,b);
xpos+=(int)random(-2,2);
ypos+=(int)random(-2,2);
if(ypos<0 || ypos>h)
ypos = int(random(height));
if(xpos<0 || xpos>w)
xpos = int(random(width));
}
void draw()
{
point(xpos,ypos);
}
}
void myRefresh(){
fill(230, 230, 200);
rect(0,0,w,h);
noFill();
}
void mouseDragged(){
fill(230, 230, 200);
noStroke();
ellipse(mouseX,mouseY,20,20);
noFill();
}
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Any ideas? I can't see what's going on. Is it something to do with me turning stroke/fill on and off al the time?
Cheers,
Ben.
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