📄 matlab 三维绘图的基本操作.htm
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class="tr"> </TR> </TBODY></TABLE> <DIV id="printBody"> <TABLE width="100%" align="center" cellspacing="0" cellpadding="0" style="word-break:break-all;table-layout:fixed;text-align:left"> <TBODY><TR> <TD class="ml"> <TD class="mm" valign="top"><BR> <DIV align="center"> <H1 class="aTitle">Matlab 三维绘图的基本操作</H1> </DIV> <TABLE width="99%" align="center"> <TBODY><TR> <TD width="120">[日期： <SPAN id="TimeLabel">2005-04-19</SPAN> ]</TD> <TD height="25" align="center">来源： <SPAN id="SourceLabel"></SPAN> 作者： <SPAN id="AuthorLabel">未知</SPAN></TD> <TD width="100" align="right">[字体：<A href="javascript:ContentSize(16)">大</A> <A href="javascript:ContentSize(14)">中</A> <A href="javascript:ContentSize(12)">小</A>] </TD> </TR> </TBODY></TABLE> <TABLE width="99%" cellpadding="0" cellspacing="0" style="clear:both"> <TBODY><TR> <TD height="25" align="right"> 【 <A href="http://www.iforchina.com/mail.aspx?ID=4468" target="_blank">推荐本教程</A> 】 【 <A href="javascript:doPrint()">打印此教程</A> 】 <SPAN class="STYLE1">【<STRONG>我要投稿</STRONG>】</SPAN> </TD> </TR> </TBODY></TABLE> <DIV id="BodyLabel" class="content" style="display:block;padding:0px 10px">7.3 三维绘图的基本操作<BR>7.3.1 三维线图指令plot3<BR><BR>【 * 例 7.3.1 -1 】 简单例题。<BR><A name="INPUT_469"><STRONG>t=(0:0.02:2)*pi;x=sin(t);y=cos(t);z=cos(2*t); <BR></STRONG></A>plot3(x,y,z,'b-',x,y,z,'bd'),view([-82,58]),box on,legend(' 链 ',' 宝石 ') <P align="center"><A name="OUTPUT_469"><IMG src="./Matlab 三维绘图的基本操作_files/050419080871271.gif"></A></P><P align="center">图 7.3.1 -1 宝石项链</P><P><BR>7.3.2 三维网线图和曲面图<BR>7.3.2.2 网线图、曲面图基本指令格式<BR><BR>【 * 例 7.3.2 .2-1 】用曲面图表现<A href="http://www.iforchina.com/search.aspx?Where=title&cid=0&Keyword=%BA%AF%CA%FD&x=24&y=8" title="所有函数有关教程">函数</A> <IMG src="./Matlab 三维绘图的基本操作_files/050419080871272.gif">。<BR><A name="INPUT_470">clf,x=-4:4;y=x;[X,Y]=meshgrid(x,y); % </A>生成 x-y 坐标“格点”矩阵<BR>Z=X.^2+Y.^2; % 计算格点上的<A href="http://www.iforchina.com/search.aspx?Where=title&cid=0&Keyword=%BA%AF%CA%FD&x=24&y=8" title="所有函数有关教程">函数</A>值<BR>surf(X,Y,Z);hold on,colormap(hot)<BR>stem3(X,Y,Z,'bo') % 用来表现在格点上计算<A href="http://www.iforchina.com/search.aspx?Where=title&cid=0&Keyword=%BA%AF%CA%FD&x=24&y=8" title="所有函数有关教程">函数</A>值 </P><P align="center"><A name="OUTPUT_470"><IMG src="./Matlab 三维绘图的基本操作_files/050419080871276.gif"><BR></A>图 7.3.2 .2-1 曲面图和格点 </P><P><BR>7.3.3 透视、镂空和裁切<BR>7.3.3.1 图形的透视<BR><BR>【 * 例 7.3.3 .1-1 】透视演示<BR><A name="INPUT_474">[X0,Y0,Z0]=sphere(30); % </A>产生单位球面的三维坐标<BR>X=2*X0;Y=2*Y0;Z=2*Z0; % 产生半径为 2 的球面的三维坐标<BR>clf,surf(X0,Y0,Z0); % 画单位球面<BR>shading interp % 采用插补明暗处理<BR>hold on,mesh(X,Y,Z),colormap(hot),hold off % 采用 hot 色图<BR>hidden off % 产生透视效果<BR>axis equal,axis off % 不显示坐标轴 </P><P align="center"><IMG src="./Matlab 三维绘图的基本操作_files/050419080871273.gif"><BR>图 7.3.3 .1-1 剔透玲珑球 </P><P><BR>7.3.3.2 图形的镂空<BR><BR>【 * 例 7.3.3 .2-1 】演示：如何利用“非数” NaN ，对图形进行剪切处理。<BR><A name="INPUT_451">clf; <BR></A>t=linspace(0,2*pi,100); r=1-exp(-t/2).*cos(4*t); % 旋转母线<BR>[X,Y,Z]=cylinder(r,60); % 产生旋转柱面数据<BR>ii=find(X<0&Y<0); % 确定 x-y 平面第四象限上的数据下标<BR>Z(ii)=NaN; % 剪切<BR>surf(X,Y,Z);colormap(spring),shading interp<BR>light('position',[-3,-1,3],'style','local') % 设置光源<BR>material([0.5,0.4,0.3,10,0.3]) % 设置表面反射 </P><P align="center"><A name="OUTPUT_451"><IMG src="./Matlab 三维绘图的基本操作_files/050419080871274.gif"><BR></A>图 7.3.3 .2-1 剪切四分之一后的图形 </P><P>【 * 例 7.3.3 .2-2 】演示：如何利用“非数” NaN ，对图形进行镂空处理。<BR><A name="INPUT_475">P=peaks(30);P(18:20,9:15)=NaN; % </A>镂空<BR>surfc(P);colormap(summer)<BR>light('position',[50,-10,5]),lighting flat<BR>material([0.9,0.9,0.6,15,0.4]) </P><P align="center"><A name="OUTPUT_475"><IMG src="./Matlab 三维绘图的基本操作_files/050419080871277.gif"><BR></A>图 7.3.3 .2-2 镂方孔的曲面</P><P><BR>7.3.3.3 裁切 <BR><BR>【 * 例 7.3.3 .3-1 】表现切面<BR><A name="INPUT_476">clf,x=[-8:0.2:8];y=x;[X,Y]=meshgrid(x,y);ZZ=X.^2-Y.^2; <BR></A>ii=find(abs(X)>6|abs(Y)>6); % 确定超出 [-6,6] 范围的格点下标<BR>ZZ(ii)=zeros(size(ii)); % 强制为 0<BR>surf(X,Y,ZZ), <STRONG>shading interp; colormap(copper)<BR></STRONG><STRONG>light('position',[0,-15,1]);lighting phong<BR></STRONG><STRONG>material([0.8,0.8,0.5,10,0.5]) </STRONG></P><P align="center"><IMG src="./Matlab 三维绘图的基本操作_files/050419080871275.gif"><BR>图 7.3.3 .3-1 经裁切处理后的图形</P></DIV> <BR> <BR> <TABLE width="99%" cellpadding="0" cellspacing="0" style="clear:both"> <TBODY><TR> <TD align="right"><TABLE> <TBODY><TR> <TD> 阅读：<SPAN id="news_hits">1812</SPAN> 次<BR> 录入： <SPAN id="MemberNameLabel"><A href="http://www.iforchina.com/memberProfile.aspx?id=2" target="_blank">破天飞龙</A></SPAN> <BR> <BR> </TD> </TR> </TBODY></TABLE></TD> </TR> </TBODY></TABLE> <TABLE width="99%" align="center" style="clear:both"> <TBODY><TR> <TD> 上一篇： <A href="http://www.iforchina.com/show.aspx?id=4467&cid=170">Matlab 特殊图形和高维可视化</A> <BR> 下一篇： <A href="http://www.iforchina.com/show.aspx?id=4469&cid=170">Matlab 二维曲线绘图的基本操作</A> </TD> </TR>⌨️ 快捷键说明
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