MATLAB高级图形处理.doc

第七章 高级图形处理一、 改变视角及消隐例7.1.1clear;z=peaks(50);surf(z);k=input(input view(1-4 or otherwise):);switch kcase 1 view(1,0,0);%视点为1,0,0 case 2 view(2);%默认的二维视角 case 3 view(-37,60); %方位角-37度，仰角60度 case 4 view(3);%默认的三维视角（37.5，30）end例7.1.2clear;z=peaks(50);mesh(z);pausehidden off%关闭消隐pausehidden on%打开消隐二、 曲面的裁减例7.2.1%利用“非数”NaN，对图形进行镂空处理P=peaks(30);%高斯分布矩阵函数P(18:20,9:15)=NaN;%镂空surfc(P);%画曲面及等高线图三、 图象显示技术例7.3.1clear;x=imread(flowers.bmp);%读入图形文件flowers.bmp，放入变量X中imagesc(x);%显示图象imwrite(x,aaa.bmp);%将内容存入文件aaa.bmp四、 句柄图形1.创建句柄底层函数figure创建图形窗口对象axes创建轴对象line创建线对象surface创曲面对象text创文本对象2.图形对象句柄的获得与删除gcf返回当前图形窗口的句柄gca返回当前轴的句柄gco获得当前对象的句柄delete删除对象3.图形对象属性的设置和使用set设置句柄图形对象属性get返回当前句柄图形对象属性4当前图形与坐标的清除clf 清除当前图形cla清除当前坐标轴例7.4.1Hf_fig1=figure(1);set(Hf_fig1,color,blue,NumberTitle,off,Name,Ex1);%-x=0:pi/50:2*pi;y=sin(x);Hf_sin=plot(x,y);set(Hf_sin,color,0.75 0 1,linewidth,3);y=cos(x);hold on;Hf_cos=plot(x,y);set(Hf_cos,color,0 1 0,linewidth,1);pausedelete(gca)例7.4.2clear;clf reset;days=Su;Mo;Tu;We;Th;Fr;Sa;temp=12.1 22.2 19.4 23.3 23.9 21.1 20.0;Hf_fig=figure(1);Hf_axes=axes(Ylim,16 26,Xtick,1:7,Xticklabel,days)Hf_line=line(1:7,temp)set(gcf,color,0 1 0);grid on;五、动画1.彗星轨迹函数例7.5.1t=0:0.001:4*pi;y=sin(t);p=0.1comet(t,y,p);例7.5.2t=-1:0.001:1*pi;y=tan(sin(t)-sin(tan(t);comet(y);例7.5.3clear;t=0:0.05:10*pi;p=0.05;for i=1:3x=t; y=sin(t); z=cos(t)+y;comet3(t,y,z,p);end例7.5.4clear;t=0:0.001:4*pi;x=t; y=sin(t);z=cos(t)+y;comet3(x,y,z);2.影片动画例7.5.5clear;n=12;t=0:2/n*pi:4*pi;x=0:1/n*pi:4*pi;nj=length(x);for i=1:n for j=1:nj y(j)=sin(x(j)-t(i); end plot(x,y); axis(0,4*pi,-1.5,1.5); m(i)=getframe;%第I帧画面象素存于矩阵M中endmovie(m,20);%矩阵M中存储的画面连续播放20次3.实时动画例7.5.6clear;clf;x0=2*pi;y0=4;H_axes1=axes(xlim,0,7,ylim,0,7);%axis(0,4,0,4);%擦除方式属性设为异或（xor）方式Hx_line1=line(0,x0,0,y0,color,blue,. erasemode,xor);Hx_head=line(x0,y0,color,red,linestyle,.,.erasemode,xor,markersize,80);for i=1:10 for th=0:pi/500:x0 x=th; y=4*abs(sin(x); set(Hx_line1,xdata,0,x,ydata,0,y); set(Hx_head,xdata,x,ydata,y); drawnow end for th=0:pi/500:x0 x=x0