三维正方体(兼容ie/ff浏览器)

时间：2010-02-05 11:30:56 来源：评论：加载中... 点击：加载中...

三维正方体(兼容ie/ff) 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...

三维正方体(兼容ie/ff)

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()).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=utf-8" /><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]);/*/beginfor(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">//constvar 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');//endfunction cube(id){if(!document.getElementById(id)) return false;this.id=document.getElementById(id);this.angle=new Array();this.angle2=new Array();for(i=1;i<=8;i++) this.angle[i]=new Array(3);// alert('success');}cube.prototype={matrix:new Array(1,0,0,0,1,0,0,0,1),paint:function(){var result='';for(i=1;i<=8;i++){this.angle[i][0]=this.matrix[0]*pa[i][0]+this.matrix[1]*pa[i][1]+this.matrix[2]*pa[i][2];this.angle[i][1]=this.matrix[3]*pa[i][0]+this.matrix[4]*pa[i][1]+this.matrix[5]*pa[i][2];this.angle[i][2]=this.matrix[6]*pa[i][0]+this.matrix[7]*pa[i][1]+this.matrix[8]*pa[i][2];this.angle2[i]=p2d(this.angle[i][0],this.angle[i][1],this.angle[i][2]);}for(i=0;i<6;i++){if((this.angle2[idx[i][2]][0]-this.angle2[idx[i][1]][0])*(this.angle2[idx[i][0]][1]-this.angle2[idx[i][1]][1])-(this.angle2[idx[i][2]][1]-this.angle2[idx[i][1]][1])*(this.angle2[idx[i][0]][0]-this.angle2[idx[i][1]][0])<0){result+=gra2htm(clr[i],this.angle2[idx[i][3]],this.angle2[idx[i][2]],this.angle2[idx[i][1]],this.angle2[idx[i][0]]);}}// document.getElementById('aa').value=result;this.id.innerHTML=result;},roll:function(type,theta){this.matrix=remx(type,theta,this.matrix);// this.paint();}}</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" /><script type="text/javascript">var tt,cc=new cube('t');cc.roll('ry',1);cc.paint();</script></body></html>

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三维正方体(兼容ie/ff浏览器) - javascript -

三维正方体(兼容ie/ff浏览器)