sandy3d--Box.as

花街六少つ

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Copyright the original author or authors.
Licensed under the MOZILLA PUBLIC LICENSE, Version 1.1 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.mozilla.org/MPL/MPL-1.1.html
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# ***** END LICENSE BLOCK *****
*/
import sandy.core.data.Vertex;
import sandy.core.data.UVCoord;
import sandy.core.face.Face;
import sandy.core.face.TriFace3D;
import sandy.core.face.QuadFace3D;
import sandy.core.Object3D;
import sandy.primitive.Primitive3D;
/**
* Box
*
* <p>Box is a primitiv Object3D, to easy build a Cube/Box.</p>
* Box长方体是一个原始Object3D,很容易就能创建一个立方体/长方体
* @作者：  Thomas Pfeiffer - kiroukou
* @version  1.0
* @date   12.07.2006
**/
class sandy.primitive.Box extends Object3D implements Primitive3D
{
/**
* Constructor
*
* <p>This is the constructor to call when you nedd to create a Box primitiv.</p>
*  这是一个构造函数，当你创建一个Box几何体时调用
* <p>This method will create a complete object with vertex,
*    normales, texture coords and the faces.
*    So it allows to have a custom 3D object easily</p>
*此方法将会创建一个具有顶点，法线，贴图坐标和面的复杂对象。所以使你很容易的自定义一个3D对象。
* @param rad 一个数，代表长方体的宽a Number represent the wide of the Box
* @param h 一个数，代表长方体的高a Number represent the height of the Box
* @param lg 一个数，代表长方体的深度a Number represent the depth of the Box
* @param mode 字符串，代表产生面的2个可用的模式，"tri"是三角面，而"quad"对应4边面。String represent the two available modes to generates the faces.
* "tri" is necessary to have faces with 3 points, and "quad" for 4 points.
*/
public function Box ( rad : Number,h : Number, lg : Number, mode:String, quality:Number )
{
  super ();
  _h = (h === undefined) ? 6 : h ;
  _lg = (lg === undefined) ? 6 : lg ;
  _radius = (rad === undefined) ? 100 : rad ;
  _q = (undefined == quality || quality <= 0 || quality > 10) ?  1 : int(quality) ;
  _mode = ( undefined == mode || (mode != 'tri' && mode != 'quad') ) ? 'tri' : mode;
  generate ();
}

/**
* generate
*
* <p>Generate all is needed to construct the Object3D : </p>
* <ul>
*  <li>{@link Vertex}</li>
*  <li>{@link UVCoords}</li>
*  <li>{@link TriFace3D}</li>
* </ul>
* <p>It can construct dynamically the object, taking care of your preferences given in arguments. <br/>
*    Note in Sandy 0.1 all faces have only three points.
*    This will change in the future version,
*    and give to you the possibility to choose n points per faces</p>
*/
public function generate ( Void ) : Void
{
  // initialisation初始化
  aPoints = []; aNormals = []; _aFaces = [];  
  //we build points生成点（逆时针，由里到外)
  var h2 : Number = - _h / 2;
  var r2 : Number = _radius / 2;
  var l2 : Number = _lg / 2;
  var p0 : Vertex = new Vertex (-r2,-h2,l2);
  aPoints.push (p0);
  var p1 : Vertex = new Vertex (r2,-h2,l2);
  aPoints.push (p1);
  var p2 : Vertex = new Vertex (r2,h2,l2);
  aPoints.push (p2);
  var p3 : Vertex = new Vertex (-r2,h2,l2);
  aPoints.push (p3);
  var p4 : Vertex = new Vertex (-r2,-h2,-l2);
  aPoints.push (p4);
  var p5 : Vertex = new Vertex (r2,-h2,-l2);
  aPoints.push (p5);
  var p6 : Vertex = new Vertex (r2,h2,-l2);
  aPoints.push (p6);
  var p7 : Vertex = new Vertex (-r2,h2,-l2);
  aPoints.push (p7);
  // -- we setup texture coordinates设置贴图坐标
  var uv0:UVCoord = addUVCoordinate (0, 0);
  var uv1:UVCoord = addUVCoordinate (1, 0);
  var uv2:UVCoord = addUVCoordinate (0, 1);
  var uv3:UVCoord = addUVCoordinate (1, 1);
  // -- Faces creation生成面
  //Front Face前面
  __tesselate(p0, p1, p2, p3,
     uv0, uv1, uv3, uv2,
     _q - 1 );

  //Behind Face背面
  __tesselate(p4, p7, p6, p5,
     uv1, uv3, uv2, uv0,
     _q - 1 );
  //Top Face顶面
  __tesselate(p2, p6, p7, p3,
     uv1, uv3, uv2, uv0,
     _q - 1 );
  //Bottom Face底面
  __tesselate(p0, p4, p5, p1,
     uv2, uv3, uv1, uv0,
     _q - 1 );
  //Left Face左面
  __tesselate(p0, p3, p7, p4,
     uv1, uv3, uv2, uv0,
     _q - 1 );
  //Right Face右面
  __tesselate(p1, p5, p6, p2,
     uv0, uv1, uv3, uv2,
     _q - 1 );
}

private function __tesselate(  p0:Vertex, p1:Vertex, p2:Vertex, p3:Vertex,
         uv0:UVCoord, uv1:UVCoord, uv2:UVCoord, uv3:UVCoord,
         level:Number):Void
{
  var f:Face;
  if(level == 0 ) // End of recurssion递归结束
  {
   // -- We have the same normal for 2 faces, be careful to don't add extra normal我们让2个面具有相同法线，注意不要额外添加法线
   if( _mode == 'tri' )
   {
    //前面
    f = new TriFace3D( this, p0, p1, p3 );
    f.setUVCoordinates( uv0, uv1, uv3 );
    addFace( f );

    f = new TriFace3D( this, p2, p3, p1 );
    f.setUVCoordinates( uv2, uv3, uv1 );
    addFace( f );
   }
   else if( _mode == 'quad' )
   {
    //前面
    f = new QuadFace3D( this, p0, p1, p2, p3 );
    f.setUVCoordinates( uv0, uv1, uv2, uv3 );
    addFace( f );
   }
  }
  else
  {
   //milieu de p0, p1;
   var m01:Vertex = new Vertex( (p0.x+p1.x)/2, (p0.y+p1.y)/2, (p0.z+p1.z)/2 );
   // milieu de p1 p2
   var m12:Vertex = new Vertex( (p1.x+p2.x)/2, (p1.y+p2.y)/2, (p1.z+p2.z)/2 );
   // milieu de p2 p3
   var m23:Vertex = new Vertex( (p2.x+p3.x)/2, (p2.y+p3.y)/2, (p2.z+p3.z)/2 );
   // milieu de p3 p0
   var m30:Vertex = new Vertex( (p3.x+p0.x)/2, (p3.y+p0.y)/2, (p3.z+p0.z)/2 );
   // milieu tout court
   var center:Vertex = new Vertex( (p0.x+p1.x+p2.x+p3.x)/4, (p0.y+p1.y+p2.y+p3.y)/4, (p0.z+p1.z+p2.z+p3.z)/4 );
   aPoints.push ( m01, m12, m23, m30, center );


   //milieu de p0, p1;
   var uv01:UVCoord = addUVCoordinate ((uv0.u+uv1.u)/2, (uv0.v+uv1.v)/2);
   // milieu de p1 p2
   var uv12:UVCoord = addUVCoordinate ( (uv1.u+uv2.u)/2, (uv1.v+uv2.v)/2 );
   // milieu de p2 p3
   var uv23:UVCoord = addUVCoordinate ( (uv2.u+uv3.u)/2, (uv2.v+uv3.v)/2 );
   // milieu de p3 p0
   var uv30:UVCoord = addUVCoordinate ( (uv3.u+uv0.u)/2, (uv3.v+uv0.v)/2 );
   // milieu tout court
   var uvcenter:UVCoord = addUVCoordinate ( (uv0.u+uv1.u+uv2.u+uv3.u)/4, (uv0.v+uv1.v+uv2.v+uv3.v)/4);


   __tesselate(center, m30, p0, m01,
      uvcenter, uv30, uv0, uv01,
      level - 1 );
   __tesselate(center, m01, p1, m12,
      uvcenter, uv01, uv1, uv12,
      level - 1 );

   __tesselate(center, m12, p2, m23,
      uvcenter, uv12, uv2, uv23,
      level - 1 );

   __tesselate(center, m23, p3, m30,
      uvcenter, uv23, uv3, uv30,
      level - 1 );

  }
}

/**
* height of the Box长方体的高
*/
private var _h : Number;
/**
* depth of the Box长方体的深度
*/
private var _lg : Number;
/**
* wide of the Box长方体的宽
*/
private var _radius : Number ;

private var _q:Number;

/*
  * Mode with 3 or 4 points per face模式字串，表明每个面是3点面还是4边面
  */
  private var _mode : String;
}