Apr 23, 2009 Here again with the first test of a Fx class.
The class can render lightnings with these specs:
- different shapes and aspect
- variable edge-smoothness to keep the extremities sticked to the origin
- runtime children generation (every trunk can generate children)
Perhaps not that useful but could be nice to implement in some game or demo.
Code soon.
13 Comments 
Apr 21, 2009 Just some hypno-fun with drawing APIs:
p.s.: this zoom back infinitely (more and more drawing API usage) so do not leave it run wildly or your cpu will burn 
Code:
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var w:Number=stage.stageWidth;
var h:Number=stage.stageHeight;
var steps:uint=5;
var stepAngle:Number=720/steps;
var div:Number=2;
var inita:Number=0;
var acc:Number=0;
function render(event:Event):void {
acc+=1;
div+=.02;
inita+=.2;
this.graphics.clear();
this.graphics.beginFill(0);
this.graphics.moveTo(w/2, h/2);
var r:Number=1;
var a:Number;
var arad:Number;
var i:int=0;
while (r<1000) {
if (div!=0) r+=r/div;
a=inita;
for (i=0; i
Apr 13, 2009 Hi there, back from an awesome week in Playa del Carmen Mexico… the most incredible vacation ever had. I’ll not post about this holiday (is or isn’t this a technical blog?). So in this last day before going back to work, I am here to post my 25lines contest and my four twittercoding entries.
Sadly 25lines.com is dying just after a couple of editions, I really enjoy this kind of stuff, but unfortunately after the first (december ’08) edition entries count started to diminish. I am the one who contributed in this premature departure as I entered only the first contest and then was to busy to work to contributing again.
However this was what I came with:
/**
* 25-Line ActionScript Contest Entry
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*
25 lines Voxel Landscape Engine by Pierluigi Pesenti
info@oaxoa.com
http://blog.oaxoa.com/
*/
// 3 free lines! Alter the parameters of the following lines or remove them.
// Do not substitute other code for the three lines in this section
[SWF(width=512, height=400, backgroundColor=0x7ddafd, frameRate=31)]
stage.align = StageAlign.TOP_LEFT;
stage.scaleMode = StageScaleMode.NO_SCALE;
// 25 lines begins here!
var paletteMap:Array=[13209,13465,13722,14235,14492,14749,15262,15519,16032,16288,16545,17058,17315,17572,18085,18342,18855,19111,19368,19881,20138,20395,20908,21165,21678,21934,22191,22704,22961,23218,23731,23988,24501,24757,25014,25527,25784,26041,26554,26811,27324,27580,27837,28350,28607,28864,29377,29634,30147,30403,30660,31173,31430,31687,32200,32457,32970,33226,33483,33996,34253,34510,35023,35280,35793,36049,36306,36819,37076,37333,37846,38103,38616,38872,39129,39642,39899,40156,40669,40926,106975,3322853,6604267,9820402,13101816,16383487,16119793,15856100,15658199,15394506,15196605,14671798,14212528,13753258,13293987,12834973,12375703,11916433,11457162,10997892,10538878,10014072,9554801,9095531,8636261,8177247,7717976,7258706,6799436,6340165,5881151,5356345,4897075,4437804,3978534,3519520,3060250,2600979,2141709,1682439,1223425,1223169,1288706,1353987,1419524,1484804,1550341,1615878,1681159,1746695,1811976,1877513,1943050,2008330,2073867,2139148,2204685,2269965,2335502,2401039,2466320,2531856,2597137,2662674,2728211,2793491,2859028,2924309,2989846,3055126,3120663,3120664,3185945,3251481,3316762,3382299,3447836,3513116,3578653,3643934,3709471,3774751,3840288,3905825,3971106,4036642,4101923,4167460,4232997,4298277,4363814,4429095,4494632,4559912,4625449,4690986,4756267,4821803,4887084,4952621,5018158,5214768,5411635,5608501,5805112,6001979,6198845,6460992,6657858,6854725,7051592,7248202,7445069,7641935,7904082,8100949,8297815,8494426,8691292,8888159,9150562,9347172,9544039,9740905,9937516,10134383,10331249,10593396,10790262,10987129,11183996,11380606,11577473,11774339,12036486,12233353,12430219,12626830,12823696,13020563,13282966,13349274,13415583,13481892,13613736,13680045,13746354,13812663,13944763,14011072,14077381,14143690,14275534,14341843,14408152,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253,14540253];
var offs:Array=[new Point(0,0),new Point(0,0),new Point(0,0),new Point(0,0)];
var bdHeight:BitmapData=new BitmapData(256*2,256,false);
var bdColor:BitmapData=new BitmapData(256*2,256,false);
var bdNoise:BitmapData=new BitmapData(256*2,256,false);
var bdOutput:BitmapData=new BitmapData(256, 256, false);
addChild(new Bitmap(bdOutput));
Bitmap(getChildAt(0)).scaleX=Bitmap(getChildAt(0)).scaleY=2;
addEventListener(Event.ENTER_FRAME, function(event:Event):void {
offs[0].x=offs[1].x=offs[2].x=offs[3].x=offs[0].x-(256-mouseX)/20;
offs[0].y=offs[1].y=offs[2].y=offs[3].y=offs[0].y+(200-mouseY)/20;
bdHeight.perlinNoise(150, 150, 3, 5, false, true, 7, true, offs);
bdColor.copyPixels(bdHeight, bdHeight.rect, new Point(0,0),bdHeight);
bdHeight.threshold(bdHeight, bdHeight.rect, new Point(0,0), "<", 0xff555555, 0xff555555);
bdNoise.perlinNoise(5, 5, 1, 5, false, true, 7, true, offs);
bdColor.paletteMap(bdColor, bdColor.rect, new Point(), paletteMap, [], []);
bdColor.draw(bdNoise, null, new ColorTransform(1,1,1,.2), BlendMode.OVERLAY);
bdOutput.fillRect(bdOutput.rect, 0x7ddafd);
for (var i:int=0; i<256; i++) {
for (var j:int=0; j<256*2; j++) {
for (var k:int=0; k<3; k++) {
if (bdOutput.getPixel(256/2+(j-256)*(120/(120+i)),50+((-bdHeight.getPixel(j,i)/(0xffffff/125)+200)*(120/(120+i)))+k)==0x7ddafd) {
bdOutput.setPixel(256/2+(j-256)*(120/(120+i)),50+(((-bdHeight.getPixel(j,i)/(0xffffff/125)+200)*(120/(120+i)))+k), bdColor.getPixel(j, i));
} else {
break;
}
}
}
}
});
// 25 lines ends here!
Which renders like this:
Yeah, yeah, know what u thinking: "He repacked the same old stuff of previous "voxels landscape" posts in 25 lines and submit to the contest! Booo".
You're right, but compacting that code in 25 lines was not that easy, and most of all this has dinamically generated map and not bitmap based like the voxels landscape post... lakes are rendered flat on the surface but still has depth gradients, there's a noise filter on the surface to mimic lesser hue variations and the loss of speed compared to the "unpacked" version is visible but not drastical.
See the winners, runners-up and mentions here.
After preparing four tweetcoding entries (140 chars only) going back to 25 lines of code would feel like absolute freedom. 140 chars is less than a sms, and as3 is quite verbose for some things. Thankfully the other 140 chars of (common) gimmick code made this contest possible.
g=graphics;
mt=g.moveTo;
lt=g.lineTo;
ls=g.lineStyle;
m=Math;
r=m.random;
s=m.sin;
i=0;
o={};
function f(e){
// paste your 140 chars here
}
addEventListener("enterFrame",f);
Mouse interactive, move mouse left/right to change the shape.
Big part of the code used to cycle colors, if you wait some minutes you will see cycling all the rgb colors. Some shape displays really fun colors pattern.
a=mouseX;x=y=200;i+=.01;g.clear();for(c=600;c--;) {g.beginFill(c*i);d=m.sqrt(m.abs(s(i)*600-c))*8;g.drawCircle(s(1.6-c*a)*d,s(c*a)*d,c/50);}
Mouse interactive, move mouse left/right to change the shape.
Sacrified the color cycling and implemented a simple 3d spinning. All the color fill is black, with a single beginFill to display the NAND effect very trendy in this contest because very cheap.
This got a notable mention... 
thank you guys. However the first version with color cycling has been more challenging for me and is still my favorite.
a=mouseX/999;x=y=200;i+=.01;g.clear();g.beginFill(0);for(c=500;c--;) {d=m.sqrt(m.abs(s(i)*500-c))*8;g.drawCircle(s(i-c*a)*d,s(c*a)*d,c/50);}
Not interactive. Just look at it if you like.
Not much to say here, just a credit to the movie "Tenacious D and the Pick of Destiny" for the title and inspiration.
i+=4;if(i<220) {m=addChild(new Sprite);m.rotationX=i*2;k=m.graphics;k.lineStyle(1);k.drawCircle(0,i,i/2);x=y=i;}rotationY+=2;rotationX+=.9
Not interactive.
Ok, ok, the sequence sucks (multiples of 8 are displayed). Wanted to have a Fibonacci one but too much code needed for the sequence to leave some spare char for the spiral. Number are interval created and the place to form a 3D spiral which is sine spinning slowly.
Totally lame here cause numbers are continuosly created and never removed, so after a minute or so, better you close the window before looking at your CPU freezing
if(i%8==0) {t=addChild(new TextField);t.text=i;t.x=s(i/30)*i/4;t.y=s(1.6-i/30)*i/4;t.z=i/2;}rotationY=s(i++/99)*150;x=y=200
Don't forget to leave a comment if you find this code and examples someway useful.
Ciaooooooooo
Dec 25, 2008 Nothing much to say here… I wanted to create some christmas themed swf and so I started to experiment with the fascinating (but kinda boring) Koch snowflake curve, and found it much more interesting setting some variable parameters to play with. (only octaves are fixed to five… you don’t really need more).
(Do not forget to play with parameters! (Flash Player 10 required))
I will not post the code now cause really needs a clean up, but if someone is interested just drop a comment and I will try to publish it in the next few days.
oh, almost forgot… Merry Christmas, happy holydays, good 2009 and bla bla.
UPDATED: After some requests I uploaded the source file (it’s a CS4 .fla)… one year later 
.
Nov 3, 2008 Ok, here we are… once again speaking about perlinNoise.
PerlinNoise is a super-cool function… nothing to object, it gives you the ability to render a smooth random varying surface on a bitmapdata.
You can use it for random behaviours, for mountains generation, for lots lots of stuff resembling the inner and deep variations hidden in nature… but lets say it: it’s kinda boring to look at.
Tired to have always the same old plain smooth boring perlinNoise? Try this simple variation.
The main concept is EXTREMELY simple and is a trick I inherited from photoshop “Render clouds / Render difference clouds” filters.
The logic is this:
Look at the simple code:
