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Topic: help with spray (Read 1432 times) |
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Eilsoe
 
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help with spray
« on: Mar 9th, 2005, 12:29am » |
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hey all!
I'm fairly new to p5 (startet 2 days ago)...
I've been trying to create a spray system using points and arrays, but the points are created in an instant on load through the array... looks kinda weird that a spray system has to initiate properly through several "squirts" 
is there a way to initiate each particle at run, so it actually starts as a spray?
example: www.avalon-rev.dk/p5/spray/
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| « Last Edit: Mar 9th, 2005, 12:40am by Eilsoe » |
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Kirupaforum moderator...
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st33d
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Re: help with spray
« Reply #1 on: Mar 9th, 2005, 2:24am » |
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I thought of creating the objects on the fly until the threshold had been reached but since the lastX and lastY seem to initialise to zero all the time I had to move their initialisation to the constructor. But it's a slow increasing spray, hope this was what you meant.
Code:
int max = 1000;
int filler = 1;
Dot[] myDot = new Dot[max];
void setup(){
stroke(255);
background(0);
size(500, 500);
framerate(60);
noSmooth();
myDot[0] = new Dot(150,250,random(15,20));
myDot[1] = new Dot(150,250,random(15,20));
}
void clearscr(){
for(int a=0;a<width;a++){
for(int b=0;b<height;b++){
set(a,b,0);
}
}
}
int a=0;
void loop(){
clearscr();
if (filler<max-1){
filler++;
myDot[filler] = new Dot(150,250,random(15,20));
}
for(int a=0;a<filler;a++){
myDot[a].move();
myDot[a].draw();
}
}
class Dot{
float xpos, ypos, drop, vx;
float lastX,lastY;//moved
Dot(float xposV, float yposV, float leftV){
xpos = xposV;
ypos = yposV;
lastX = xpos;//moved
lastY = ypos;//moved
drop = random(-1,-10);
vx = leftV;
}
void draw(){
line(xpos,ypos, lastX, lastY);
lastX = xpos;
lastY = ypos;
}
void move(){
drop += 0.1;
ypos += drop;
vx *= 0.99;
xpos += vx;
if(xpos>width){
xpos = width;
vx *= 0.1;
vx = -vx;
drop *= 0.2;
}
if(ypos>height){
ypos = 250;
xpos = 150;
lastX = 150;
lastY = 250;
drop = random(-1,-10);
vx = random(15,20);
}
}
}
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I could murder a pint.
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Eilsoe
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Re: help with spray
« Reply #2 on: Mar 9th, 2005, 12:32pm » |
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great man, thanks, just what I wanted 
odd question: you start off by creating 2 instances on setup, why is that? I tried removing one, and it froze during playback... (?)
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Kirupaforum moderator...
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st33d
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Re: help with spray
« Reply #3 on: Mar 9th, 2005, 12:45pm » |
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int filler = 0;
I should have set filler to start at zero but I just plonked another object making line in there. Sometimes I practically just throw code at the computer and hope it works, or just repaste whole chunks of code when I could be writing a function instead. Sorry about that.
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I could murder a pint.
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Eilsoe
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Re: help with spray
« Reply #4 on: Mar 9th, 2005, 12:54pm » |
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oh ok, don't worry about, I have a habit of throwing code at it too
optimization comes second, functionality first.
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Kirupaforum moderator...
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