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vector-field-balls.js
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vector-field-balls.js
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///////////////////////////////////////////////////////////////////////////
/*
class BinaryTree {
constructor(value) {
this.data = value;
this.left = null;
this.right = null;
}
insert(value) {
if (this.data) {
//adding to the left if the value is less than the data of parent node
if (value < this.data) {
if (this.left) {
this.left.insert(value)
} else {
this.left = new BinaryTree(value)
}
}
//adding to the right node if the value is more than the data of parent node
else if (value > this.data) {
if (this.right) {
this.right.insert(value)
} else {
this.right = new BinaryTree(value)
}
} else {
this.data = value
}
}
}
}
a = new BinaryTree(100)
a.insert(20)
a.insert(121)
a.insert(35)
a.insert(10)
*/
//////////////////////////////////////////////////////////////////////////
elem = document.getElementById("container");
setCanvas(elem);
w = WIDTH;
h = HEIGHT;
n=200;
poss=[]
function makepoints(){
for(ix=0;ix<n;ix++){
pos={
x:random(0,w),
y:random(0,h),
vx:0,
vy:0,
past:[],
lt:1,
};
poss.push(pos);
};
};
makepoints();
t=0;
v1=-4*PI;
v2=4*PI;
function draw() {
clearCanvas();
/*
for(i=0;i<w;i+=40){
for(j=0;j<h;j+=40){
x=mapRange(pos.x,0,w,v1,v2);
y=mapRange(pos.y,0,h,v1,v2);
g=sin(y) //vertical component
f=cos(x); //horizonatl componenet
th= atan(f/g);
x1=i+5*cos(th);
y1=j+5*sin(th);
points=[[i,j],[x1,y1]];
for(k=0;k<12;k++){
y=mapRange(y1,0,h,v1,v2)
x=mapRange(x1,0,w,v1,v2)
g=sin(y) //vertical component
f=cos(x); //horizonatl componenet
th= atan(f/g);
x2=x1+5*cos(th);
y2=y1+5*sin(th);
points.push([x2,y2])
x1=x2;
y1=y2;
}
ic=mapRange(th,0,2*PI,280,330);
ic=`hsla(${ic},100%,50%,0.5)`;
new polygon(points,'none',0,ic,1,false);
}
}
*/
for(i=0;i<n;i++){
pos=poss[i]
xp=mapRange(pos.x,0,w,v1,v2);
yp=mapRange(pos.y,0,h,v1,v2);
g=yp; //horizontal component
f=-yp-(4.9)*sin(xp); //vertical component
th= atan(f/g);
//console.log(th)
ic=mapRange(cos(th),-1,1,230,300);
ic=`hsla(${ic},100%,50%,${pos.lt})`;
new point(pos.x,pos.y,ic,2);
pos.x+=g;
pos.y+=f;
pos.past.push([pos.x,pos.y]);
if(pos.past.length>80){
pos.past.shift();
}
new polygon(pos.past,'none',0,ic,1,false);
}
if(t>poss[0].lt){
poss=[];
makepoints();
t=0;
}
t+=0.01;
requestAnimationFrame(draw);
}
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
draw();