Flying Kite actionscript?

[Riaan26]

Hallo!

I am looking for an actionscript to make a kite fly randomly in the air.

Any help is appreciated.

Thanks so much!

[Nig 13]

This is the best I can do:

make a kite, convert it to a movieclip with the registration point set to center, give it an instance name of mc, and use this code on your Frame:

X = mc._x;
Y = mc._y

function randomPoints(){
    X = Math.random()*Stage.width;
    Y = Math.random()*Stage.height;
    r = (Math.random()*180)-90;
}

mc.onEnterFrame = function(){
    this._x += (X-this._x)/100;
    this._y += (Y-this._y)/100;
    this._rotation += (r-this._rotation)/50;
}

setInterval(randomPoints, 500);

not good, but better than the answer you got over at Actionscript.org :/

[Riaan26]

Thanks so much for the effort Nig, I'll give that a shot! Kudos for noticing my other post....

[Riaan26]

This is the best I can do:

make a kite, convert it to a movieclip with the registration point set to center, give it an instance name of mc, and use this code on your Frame:

X = mc._x;
Y = mc._y

function randomPoints(){
    X = Math.random()*Stage.width;
    Y = Math.random()*Stage.height;
    r = (Math.random()*180)-90;
}

mc.onEnterFrame = function(){
    this._x += (X-this._x)/100;
    this._y += (Y-this._y)/100;
    this._rotation += (r-this._rotation)/50;
}

setInterval(randomPoints, 500);

not good, but better than the answer you got over at Actionscript.org :/

a decent effort, thanks. I was looking for something with smoother movements, but I'll take this, thank you VERY MUCH!

[Nig 13]

I thought the movements were not smooth enough either, so I gave it another shot, using trigonometry randomly :

speed = 0.06; // the lower the slower
wind = 5; // the higher the slower

r = 2;
d = 5;

onEnterFrame = function(){
    r += speed;
    d += (Math.random())/wind;
    mc._x += Math.sin(r+(Math.random()*Math.cos(r/2)));
    mc._y += Math.sin(r+(Math.random()*Math.tan(r)));
    mc._rotation = (Math.cos(d)*90/Math.PI)/5;
}

Try adjusting the first two variables, if you want to change the speed and wind. This one is not perfect, but hopefully better than the last one

[Rob.Shelley]

Slightly different approach here:

import flash.display.BitmapData;

// set the bViewWind boolean true to see a larger presentation of the 
// perlin noise bitmapData
var bViewWind:Boolean = false;

var windBMD:BitmapData;
if (bViewWind){
    windBMD = new BitmapData(400, 300, false, 0x000000);
    this.createEmptyMovieClip("bmp1", this.getNextHighestDepth());
    bmp1.attachBitmap(windBMD, 1, auto, true);
}else{
    windBMD = new BitmapData(1, 1, false, 0x000000);
}
var seed:Number = Math.floor(Math.random() * 256);
var channels:Number = 1 | 2;
var offset:Array = [{x:0,y:0}];

this.createEmptyMovieClip("kite", this.getNextHighestDepth());
kite.beginFill(0xaa0000);
kite.moveTo(0,-20);
kite.lineTo(20,0);
kite.lineTo(0,40);
kite.lineTo(-20,0);
kite.endFill();
var windBluster:Number = getBluster();

var initX:Number = 50;
var initY:Number = 400;
var endX:Number = 400;
var endY:Number = 150;

this.onEnterFrame = function(){
    this.offset[0].x -= 2;
    this.offset[0].y += 1;
    this.windBMD.perlinNoise( 400, 300, 1, seed, false, true, channels, false, offset );
    
    var col:Number = windBMD.getPixel(0,0);
    var colvals:Object = col2rgb(col);
    this.kite._x = this.endX + (127 - colvals.r)/this.windBluster;
    this.kite._y = this.endY + (127 - colvals.g)/this.windBluster;
    
    this.drawLine((127 - colvals.g), (256 - colvals.r));
    
}

function getBluster():Number{
    var val:Number = 0;
    while(val == 0){
        val = Math.random()*5;
    }
    return Math.max(0.6,val);
}

function col2rgb(hex):Object{
    var red = hex>>16;
    var greenBlue = hex-(red<<16)
    var green = greenBlue>>8;
    // no need for blue in this instance
    //var blue = greenBlue - (green << 8);
    return({r:red, g:green});
}

function drawLine(swingX:Number, swingY:Number){
    this.clear();
    this.lineStyle(1, 0);
    this.moveTo(this.initX, this.initY);
    this.curveTo(this.kite._x+swingX, this.kite._y+swingY, this.kite._x, this.kite._y);
}

Makes use of perlin noise to create the displacement. Idea is to take the red value of the first pixel in the displacement map to change the _x value of the kite, the blue channel value alters the _y value.

Change bViewWind to true at the top and you'll see a bitmap being updated.

You can play with the values in the perlinNoise call (line 36) to see different effects.

Cheers,
Rob

[Riaan26]

Thanks to both of you!