雷とか放電とか。
perlinNoiseで雷とか放電とか。
* ボタン押下中はスロー風味になります。
/**
* Copyright hogemaruo ( http://wonderfl.net/user/hogemaruo )
* MIT License ( http://www.opensource.org/licenses/mit-license.php )
* Downloaded from: http://wonderfl.net/c/miZT
*/
/**
* perlinNoiseで雷とか放電とか。
* ボタン押下中はスロー風味になります。
*/
package
{
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.filters.GlowFilter;
import flash.filters.DropShadowFilter;
import flash.display.Graphics;
public class Thunder extends Sprite
{
public function Thunder()
{
const NOISE_BIT:int = 7;
const NOISE_RANGE:int = 1 << NOISE_BIT;
const NOISE_MASK:int = NOISE_RANGE-1;
var bmp:Bitmap = new Bitmap( new BitmapData(NOISE_RANGE, NOISE_RANGE));
bmp.bitmapData.perlinNoise(NOISE_RANGE, NOISE_RANGE, 8, Math.floor(Math.random() * 0xffff), true, true, 4 );
normalize( bmp.bitmapData );
var spr:Sprite = new Sprite();
addChild( spr );
var f0:Array = [new GlowFilter(0xffffff, 0.5, 16, 16, 1, 1),new GlowFilter(0xffff00, 1, 8, 8, 1, 1),new DropShadowFilter(0, 90, 0xcc3300, 1, 64, 64,5,3)];
var f1:Array = [new GlowFilter(0xffffff, 0.5, 16, 16, 1, 1),new GlowFilter(0x00ffff, 1, 8, 8, 1, 1),new DropShadowFilter(0, 90, 0x0033CC, 1, 64, 64,5,3)];
var ry:int = 0;
var rx:int = 0;
var baseX:int = stage.stageWidth / 2;
var baseY:int = 0;
var vx:Number = 0;
var vy:Number = 1;
var len:Number = 256;
var ptn:int = 0;
spr.filters = f0;
graphics.beginFill(0x000000);
graphics.drawRect(0,0,stage.stageWidth,stage.stageHeight);
graphics.endFill();
stage.addEventListener( MouseEvent.MOUSE_DOWN, function( e:MouseEvent):void {
ptn = 1;
spr.filters = f1;
});
stage.addEventListener( MouseEvent.MOUSE_UP, function( e:MouseEvent):void {
ptn = 0;
spr.filters = f0;
});
stage.addEventListener( MouseEvent.MOUSE_MOVE, function( e:MouseEvent):void {
var _dx:Number = mouseX - baseX;
var _dy:Number = mouseY - baseY;
var _len:Number = Math.sqrt(_dx * _dx + _dy * _dy);
if ( _len != 0 ) {
len = _len;
vx = _dx / len;
vy = _dy / len;
}
});
stage.addEventListener(Event.ENTER_FRAME, function(e:Event):void {
if ( ptn == 0){
rx += Math.floor(Math.random() * 4);
ry = Math.floor(Math.random() * NOISE_RANGE);
}else {
rx++;
ry+=2;
}
rx &= NOISE_MASK;
ry &= NOISE_MASK;
var colBase:int = bmp.bitmapData.getPixel(rx, ry) & 0xff;
spr.graphics.clear();
spr.graphics.lineStyle(Math.floor(Math.random() * 4) + 1, 0xffffff);
var _x:Number = baseX;
var _y:Number = baseY;
spr.graphics.moveTo(_x, _y);
for ( var i:int = 1; i < NOISE_RANGE; i++ ) {
var c:int = ( bmp.bitmapData.getPixel((rx+i) & NOISE_MASK, ry) & 0xff ) -colBase;
spr.graphics.lineTo(_x+c*vy, _y +c*-vx);
_x += vx * len / NOISE_RANGE;
_y += vy * len / NOISE_RANGE;
}
});
}
private function normalize( data:BitmapData, range:int = 255 ):void {
var min:int = 255;
var max:int = 0;
for ( var i:int = 0; i < data.height; i++ ) {
for ( var j:int = 0; j < data.width; j++ ) {
var col:int = data.getPixel(j, i);
if ( col < min ) min = col;
if ( col > max ) max = col;
}
}
if( max == 0 )return;
for ( i = 0; i < data.height; i++ ) {
for ( j = 0; j < data.width; j++ ) {
col = ( data.getPixel(j, i) & 0xff ) - min;
col = col * range / max;
data.setPixel( j, i, col );
}
}
}
}
}