random lines

der er utallige metoder, de fleste rimeligt simple
kig her og find et par stykker du kan lære noget af ;)
http://www.flashkit.com/movies/

Læg det her i frame 1 - så får du linier der bevæger sig med forskellig fart og placering!

n = 0; //name
cds = 10; //change direction speed
maxs = 10; //max speed
ss = 400; //screen size
nl = 10; //number of lines
function makeline(n){
    this.createEmptyMovieClip(n, n);
    this[n].f = Math.round( Math.random()*0xFFFFFF );
    this[n].x1 = random(400); this[n].y1 = random(400); this[n].r1 = random(360); this[n].s1 = random(maxs);
    this[n].x2 = random(400); this[n].y2 = random(400); this[n].r2 = random(360); this[n].s2 = random(maxs);
    this[n].onEnterFrame = function(){
        this.c++;
        if (this.c>=cds) {
            this.c = random(cds);
            this.r1 += random(3)-1;
            this.r2 += random(3)-1;
            temp = random(3)-1; if(this.s1+temp>1 and this.s1+temp<=maxs) this.s1 += temp;
            temp = random(3)-1; if(this.s2+temp>1 and this.s2+temp<=maxs) this.s2 += temp;
        }
        this.x1 = findxy(this, this.x1, 1);
        this.y1 = findxy(this, this.y1, 1);
        this.x2 = findxy(this, this.x2, 2);
        this.y2 = findxy(this, this.y2, 2);
        drawline(this, this.f, this.x1,this.y1,this.x2,this.y2);
    }
}
function drawline(mc, f, x1, y1, x2, y2){
    mc.clear();
    mc.lineStyle(1, f, 100);
    mc.moveTo(x1,y1);
    mc.lineTo(x2,y2);
}
function findxy(mc, xy, t){
    temp = Math.cos(Math.PI/180 * mc["r"+t])*mc["s"+t];
    if(xy+temp>0 and xy+temp<ss){
        xy += temp;
    } else {
        mc["r"+t] -= 180;
        temp = Math.cos(Math.PI/180 * mc["r"+t])*mc["s"+t];
        xy += temp;
    }
    return xy;
}
for(i=0;i<nl;i++) makeline(i);

Hmm der var lige lidt fejl på nogle x og y værdier, så her er der en der virker korrekt:

n = 0; //name
cds = 10; // change direction speed
mins = 3; //min speed 0-9 (men altid mindre end maxs)
maxs = 10; //max speed 2-10
ss = 400; //screen size
nl = 10; //number of lines
function makeline(n){
    this.createEmptyMovieClip(n, n);
    this[n].f = Math.round( Math.random()*0xFFFFFF );
    this[n].x1 = random(400); this[n].y1 = random(400); this[n].r1 = random(360); this[n].s1 = mins + random(maxs-mins);
    this[n].x2 = random(400); this[n].y2 = random(400); this[n].r2 = random(360); this[n].s2 = mins + random(maxs-mins);
    this[n].onEnterFrame = function(){
        this.c++;
        if (this.c>=cds) {
            this.c = random(cds);
            this.r1 += random(3)-1; if(this.r1<0) this.r1 += 360; if(this.r1>360) this.r1 -= 360;
            this.r2 += random(3)-1; if(this.r2<0) this.r2 += 360; if(this.r2>360) this.r2 -= 360;
            temp = random(3)-1; if(this.s1+temp>mins and this.s1+temp<=maxs) this.s1 += temp;
            temp = random(3)-1; if(this.s2+temp>mins and this.s2+temp<=maxs) this.s2 += temp;
        }
        this.x1 = findx(this, this.x1, 1);
        this.y1 = findy(this, this.y1, 1);
        this.x2 = findx(this, this.x2, 2);
        this.y2 = findy(this, this.y2, 2);
        drawline(this, this.f, this.x1,this.y1,this.x2,this.y2);
    }
}
function drawline(mc, f, x1, y1, x2, y2){
    mc.clear();
    mc.lineStyle(1, f, 100);
    mc.moveTo(x1,y1);
    mc.lineTo(x2,y2);
}
function findx(mc, x, t){
    temp = Math.cos(Math.PI/180 * mc["r"+t])*mc["s"+t];
    if(x+temp<=0 or x+temp>=ss) mc["r"+t] = 180 - mc["r"+t];
    x += Math.cos(Math.PI/180 * mc["r"+t])*mc["s"+t];
    return x;
}
function findy(mc, y, t){
    temp = Math.sin(Math.PI/180 * mc["r"+t])*mc["s"+t];
    if(y+temp<=0 or y+temp>=ss) mc["r"+t] = -mc["r"+t];
    y += Math.sin(Math.PI/180 * mc["r"+t])*mc["s"+t];
    return y;
}
for(i=0;i<nl;i++) makeline(i);

Og nu også med farveskift :-D:

n = 0; //name
cds = 10; // change direction speed
mins = 3; //min speed 0-9 (men altid mindre end maxs)
maxs = 10; //max speed 2-10
fs = 5; //fade speed low=fast high=slow
ss = 400; //screen size
nl = 10; //number of lines
function makeline(n){
    this.createEmptyMovieClip(n, n);
    this[n].f1 = Math.round( Math.random()*0xFFFFFF );
    this[n].f2 = this[n].f1;
    this[n].x1 = random(400); this[n].y1 = random(400); this[n].r1 = random(360); this[n].s1 = mins + random(maxs-mins);
    this[n].x2 = random(400); this[n].y2 = random(400); this[n].r2 = random(360); this[n].s2 = mins + random(maxs-mins);
    this[n].onEnterFrame = function(){
        this.c++;
        if (this.c>=cds) {
            this.c = random(cds);
            this.f2 = Math.round( Math.random()*0xFFFFFF );
            this.r1 += random(3)-1; if(this.r1<0) this.r1 += 360; if(this.r1>360) this.r1 -= 360;
            this.r2 += random(3)-1; if(this.r2<0) this.r2 += 360; if(this.r2>360) this.r2 -= 360;
            temp = random(3)-1; if(this.s1+temp>mins and this.s1+temp<=maxs) this.s1 += temp;
            temp = random(3)-1; if(this.s2+temp>mins and this.s2+temp<=maxs) this.s2 += temp;
        }
        this.f1 = colorfade(this.f1,this.f2);
        this.x1 = findx(this, this.x1, 1);
        this.y1 = findy(this, this.y1, 1);
        this.x2 = findx(this, this.x2, 2);
        this.y2 = findy(this, this.y2, 2);
        drawline(this, this.f1, this.x1,this.y1,this.x2,this.y2);
    }
}
function drawline(mc, f, x1, y1, x2, y2){
    mc.clear();
    mc.lineStyle(2, f, 100);
    mc.moveTo(x1,y1);
    mc.lineTo(x2,y2);
}
function findx(mc, x, t){
    temp = Math.cos(Math.PI/180 * mc["r"+t])*mc["s"+t];
    if(x+temp<=0 or x+temp>=ss) mc["r"+t] = 180 - mc["r"+t];
    x += Math.cos(Math.PI/180 * mc["r"+t])*mc["s"+t];
    return x;
}
function findy(mc, y, t){
    temp = Math.sin(Math.PI/180 * mc["r"+t])*mc["s"+t];
    if(y+temp<=0 or y+temp>=ss) mc["r"+t] = -mc["r"+t];
    y += Math.sin(Math.PI/180 * mc["r"+t])*mc["s"+t];
    return y;
}
function colorfade(f1,f2){
    r = ((f1 & 0xFF0000) >> 16) - Math.round(( ((f1 & 0xFF0000) >> 16) - ((f2 & 0xFF0000) >> 16) )/fs);
    g = ((f1 & 0xFF00) >> 8) - Math.round(( ((f1 & 0xFF00) >> 8) - ((f2 & 0xFF00) >> 8) )/fs);
    b = (f1 & 0xFF) - Math.round( ( (f1 & 0xFF) - (f2 & 0xFF) )/fs);
    return r << 16 | g << 8 | b;
}
for(i=0;i<nl;i++) makeline(i);