三维正方体(兼容ie,ff) [复制链接]

alenalen　楼主

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发表于 2008-2-16 22:04:13 |显示全部楼层

这是我在做的一个游戏的半成品,整理了一下发出来.
原理:
通过更新变换矩阵来记录转动(函数remx()).
利用矩阵计算出转动后的正方体顶点坐标,
把各个顶点的空间坐标按”近大远小”转换成平面坐标(函数p2d()),
用正方体各个面的法向量的z坐标判断该面是否可见,
用高为1px的div层模拟画出四边形(函数gra2htm()).
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鼠标拖曳的代码用别人的代码修改的.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>Cube</title>
<script type="text/javascript">
function gra2htm(clr,a,b,c,d){
  var result='';
  var maxx=Math.max(a[0],b[0],c[0],d[0]),minx=Math.min(a[0],b[0],c[0],d[0]);
  var maxy=Math.max(a[1],b[1],c[1],d[1]),miny=Math.min(a[1],b[1],c[1],d[1]);
  x=new Array(a[0],b[0],c[0],d[0],a[0],b[0],c[0],d[0],a[0],b[0]);
  y=new Array(a[1],b[1],c[1],d[1],a[1],b[1],c[1],d[1],a[1],b[1]);
  
  /*/begin
  for(var i=0;i<=3;i++){
    result+='<div style="position:absolute; overflow:hidden; left:'
    +x[i]+'px; top:'+y[i]+'px; width:2px; height:2px; background-color:#FFF"></div>';
  }
  //end*/
  
  if(maxx-minx>=maxy-miny){
    for(var i=3;i<=6;i++)
      if(y[i]==miny){
        var k=l=i;
        break;
      }
    if(y[k]==y[k-1]) k--;
    xa=(x[k-1]-x[k])/(y[k-1]-y[k]);
    if(y[l]==y[l+1]) l++;
    xb=(x[l+1]-x[l])/(y[l+1]-y[l]);
    pl=x[k];pw=x[l]-x[k];
    for(var i=miny+1;i<=maxy;i++){
      if(i>y[k-1]){
        k--;
        xa=(x[k-1]-x[k])/(y[k-1]-y[k]);
      }
      if(i>y[l+1]){
        l++;
        xb=(x[l+1]-x[l])/(y[l+1]-y[l]);
      }
      result+='<div style="overflow:hidden; top:'+i
        +'px; left:'+Math.round(pl+=xa)
        +'px; width:'+Math.round(pw+=xb-xa)
        +'px; height:1px; position:absolute; background-color:'+clr
        +';"></div>';
    }
  } else {
    for(var i=3;i<=6;i++)
      if(x[i]==minx){
        var k=l=i;
        break;
      }
    if(x[k]==x[k+1]) k++;
    ya=(y[k+1]-y[k])/(x[k+1]-x[k]);
    if(x[l]==x[l-1]) l--;
    yb=(y[l-1]-y[l])/(x[l-1]-x[l]);
    pt=y[k];ph=y[l]-y[k];
    for(var i=minx+1;i<=maxx;i++){
      if(i>x[k+1]){
        k++;
        ya=(y[k+1]-y[k])/(x[k+1]-x[k]);
      }
      if(i>x[l-1]){
        l--;
        yb=(y[l-1]-y[l])/(x[l-1]-x[l]);
      }
      result+='<div style="overflow:hidden; left:'+i
        +'px; top:'+Math.round(pt+=ya)
        +'px; height:'+Math.round(ph+=yb-ya)
        +'px; width:1px; position:absolute; background-color:'+clr
        +';"></div>';
    }
  }
  return result;
}

function remx(type,theta,omx){
  var sinA=Math.sin(theta),cosA=Math.cos(theta);
  var m=new Array();
  switch(type){
    case 'rx':
      m[0]=omx[0];m[1]=omx[1];m[2]=omx[2];
      m[3]=omx[3]*cosA-omx[6]*sinA;m[4]=omx[4]*cosA-omx[7]*sinA;m[5]=omx[5]*cosA-omx[8]*sinA;
      m[6]=omx[3]*sinA+omx[6]*cosA;m[7]=omx[4]*sinA+omx[7]*cosA;m[8]=omx[5]*sinA+omx[8]*cosA;
      break;
    case 'ry':
      m[0]=omx[0]*cosA-omx[6]*sinA;m[1]=omx[1]*cosA-omx[7]*sinA;m[2]=omx[2]*cosA-omx[8]*sinA;
      m[3]=omx[3];m[4]=omx[4];m[5]=omx[5];
      m[6]=omx[0]*sinA+omx[6]*cosA;m[7]=omx[1]*sinA+omx[7]*cosA;m[8]=omx[2]*sinA+omx[8]*cosA;
      break;
  }
  return m;
}

function p2d(x,y,z){
  var l=100,t=100;
  var result=new Array();
  result[0]=Math.round(l+x/(z*0.004+1.25));
  result[1]=Math.round(t+y/(z*0.004+1.25));
  return result;
}
</script>
<script type="text/javascript">
//const
  var pa=new Array();
  pa[1]=new Array(50,50,-50);
  pa[2]=new Array(50,50,50);
  pa[3]=new Array(50,-50,50);
  pa[4]=new Array(50,-50,-50);
  pa[5]=new Array(-50,50,-50);
  pa[6]=new Array(-50,50,50);
  pa[7]=new Array(-50,-50,50);
  pa[8]=new Array(-50,-50,-50);
  var idx=new Array();
  idx[0]=new Array(1,2,3,4);
  idx[1]=new Array(1,4,8,5);
  idx[2]=new Array(1,5,6,2);
  idx[3]=new Array(7,3,2,6);
  idx[4]=new Array(7,8,4,3);
  idx[5]=new Array(7,6,5,8);
  var clr=new Array('#03c','#c00','#fc0','#f60','#fff','#090');
//end

</script>
<script type="text/javascript">
var tmr=(new Date()).getTime();
function drag(obj,e){
  e=e?e:window.event;
  var setx=e.clientX,sety=e.clientY;
  
        if(document.addEventListener){ 
            document.addEventListener('mousemove', inFmove, true); 
            document.addEventListener('mouseup', inFup, true); 
        } else if(document.attachEvent){ 
            document.attachEvent('onmousemove', inFmove); 
            document.attachEvent('onmouseup', inFup); 
        } 
         
  function inFmove(e){
    tmr2=(new Date).getTime();
    if(tmr2-tmr<100) return false;
    tmr=tmr2;
    cc.roll('ry',(e.clientX-setx)/50);
    setx=e.clientX;
    cc.roll('rx',(e.clientY-sety)/50);
    sety=e.clientY;
    cc.paint();
    return false;
  }
  function inFup(){ 
            if(document.removeEventListener){ 
                document.removeEventListener('mousemove', inFmove, true); 
                document.removeEventListener('mouseup', inFup, true); 
            } else if(document.detachEvent){ 
                document.detachEvent('onmousemove', inFmove); 
                document.detachEvent('onmouseup', inFup); 
            } 
  } // shawl.qiu script 
}
</script>
</head>
<body>
<div id="t" style="width:200px;height:200px;background-color:#000000;" oncontextmenu="return false" onmousedown="drag(this,event)"></div>
<br />
<input type="button" onClick="clearInterval(tt)" value="Stop" />
<input type="button" onClick="clearInterval(tt);tt=setInterval('cc.roll(\'rx\',0.2);cc.paint();',100)" value="Down" />
<input type="button" onClick="clearInterval(tt);tt=setInterval('cc.roll(\'ry\',0.2);cc.paint();',100)" value="Right" />

</body>
</html>

提示：您可以先修改部分代码再运行

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