波

めちゃめちゃ重くてすいません。

by linktale 28 May 2012

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nami wave メモ
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/**
 * Copyright linktale ( http://wonderfl.net/user/linktale )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/sXLD
 */

// http://linktale.net/

package { 

import flash.display.DisplayObjectContainer;
import flash.display.Sprite;
import flash.events.Event;

[SWF(backgroundColor="0xffffff", frameRate="24")] 

public class Nami extends Sprite {
    //parent stage
    private var _parent_stage_w:int;
    private var _parent_stage_h:int;
    //main
    private var _nami_color:uint //なみの色
    private var _nami_h:int; //波の縦幅
    private var _cell_y:Number; //波のY位置
    private var _cell_cnt:int; //波の数
    private var _cell_list:Array = new Array(); //波セルのリスト 
    private var _mouse_area:Number = 20.0;
    //nami
    private var _period:Number = 2.0; //周期T
    private var _a_min:Number = 0.0; //振幅の最小値（まるめ）
    private var _f:Number = 20.0; //振幅数
    private var _t:int = 1; //波時間
    private var _nami_spring:Number = 0.1; //ばね
    private var _nami_friction:Number = 0.8; //跳ね
    //nami patter
    private var _motion_y:Number = 0.0;
    private var _motion_vy:Number = 0.0;
    //count
    private var _enter_nami_cnt:int = 0; //Nami EnterFrame回数
    private var _motion_cnt:int = 0; //自動波用カウント
    
    //const
    private const CELL_W:int = 1;
    private const AROUND_NAMI_A:Number = 0.3;
    private const AROUND_NAMI_Y:Number = 0.2;
    
    public function Nami() {    
        var p_h:int = 250;
        var p_color:uint = 0x000000;

        //クラス変数にセット
        _parent_stage_w = 500; 
        _parent_stage_h = 500;
        _nami_color = p_color; 
        _nami_h = p_h;
        _cell_cnt = _parent_stage_w / CELL_W;
        _cell_y = _parent_stage_h - p_h;
        
        init();
    }
    
    private function init():void {
        setCell();
        addEventListener( Event.ENTER_FRAME, onEnterFrameNami );
        addChild( this );
    }
    
    //セルをセット
    private function setCell():void {
        var i:uint;
        var cell:Cell;
        
        for (i = 0; i < _cell_cnt; i++ ) {
            cell = new Cell( CELL_W, _nami_h * 2.5, _nami_color );
            cell.x = i * CELL_W;
            cell.y = _cell_y;
            
            addChild(cell);
            _cell_list.push(cell);
        }
    }
    
    //NamiのEnterFrame
    private function onEnterFrameNami(e:Event):void {
        namiMove(); //描画
        setMotion();
        _enter_nami_cnt++;
    }
    
    //波を動かす処理
    private function namiMove():void {
        var i:uint, y:Number;
        
        for (i = 0; i < _cell_cnt; i++ ) {
            if (!(_cell_list[i].y == _cell_y && _cell_list[i]._a == 0)) {
                if ( Math.abs(_cell_list[i]._a) <= AROUND_NAMI_A && Math.abs(_cell_list[i].y) <= _cell_y + AROUND_NAMI_Y) {
                    //丸め処理
                    _cell_list[i].y = _cell_y;
                    _cell_list[i]._a = 0;
                }else {
                    //定常波の方程式
                    y = _cell_list[i]._a * Math.sin( _t / _period - i * CELL_W / _f );
                    y += _cell_y;                        
                    _cell_list[i].y = y; //描画
                }
                
                //加速度をばねる
                springA(_cell_list[i]); //振幅を変化
            }
            //マウスチェック
            checkWave( i, mouseX, mouseY, 3.0 );
        }
        _t++; //波時間を進める
    }
    
    //波の振幅をばねで計算
    private function springA( p_cell:Cell ):void {
        var dx:Number = _a_min - p_cell._a;
        var ax:Number = dx * _nami_spring;
        p_cell._vx += ax;
        p_cell._vx *= _nami_friction;
        p_cell._a += p_cell._vx;
    }
    
    //マウスチェック
    private function checkWave(p_i:int, p_target_x:Number, p_target_y:Number, nami_rate:Number ):void {
        var dx:Number = _cell_list[p_i].x - p_target_x;
        var dy:Number = _cell_list[p_i].y - p_target_y;
        var dist:Number = Math.sqrt( dx * dx + dy * dy );
        
        if (dist < _mouse_area) {
            addWave(p_i, nami_rate);
        }
    }
    
    //波追加
    private function addWave(target:int,up_rate:Number):void {
        wavePattern1(target,up_rate);
    }

    //波パターン
    private function wavePattern1(p_i:int, up_rate:Number):void {
        var i:uint, y:Number;
        var start_i:int = p_i - 100; if (start_i < 0) { start_i = 0; }
        var end_i:int =  p_i + 100; if (end_i > _cell_cnt) { end_i = _cell_cnt; }
        var dist:Number;
        
        for (i = start_i; i < end_i; i++) {
            dist = Math.abs((p_i - i)); if (dist == 0) { dist = 1.0; }
            y = 1 / dist * up_rate;
            _cell_list[i]._a += y;
        }
    }
    
    //自動波セット
    private function setMotion():void {
        var i:uint, dx:Number;
        var target_x:Number = _motion_cnt * CELL_W * 25; //波をチェックする時のX対象
        
        if(target_x < _cell_cnt){
            for (i = 0; i < _cell_cnt; i++ ) {
                //波のチェックYを計算
                dx = _cell_y - _motion_y;
                _motion_vy += dx;
                _motion_y += _motion_vy;
                
                //チェックする
                checkWave(i, target_x, _motion_y, 5.5);
            }
            
        }
        
        if (_motion_cnt > 100) {
            _motion_cnt = 0;
        }
        
        _motion_cnt++;
    }
}

} 

import flash.display.Sprite;

class Cell extends Sprite {
    public var _w:int = 0;
    public var _h:int = 0;
    public var _color:int = 0;
    public var _a:Number = 0.0; //振幅
    public var _vx:Number = 0.0; //速度
    
    public function Cell( p_w:Number = 1, p_h:Number = 1, p_color:uint = 0xffffff ) {
        _w = p_w;
        _h = p_h;
        _color = p_color;
        
        graphics.beginFill(_color); 
        graphics.drawRect(0, 0, _w, _h);  
    }        
}