搞个气氛用MATLAB画一棵精致的圣诞树

2023-10-24 04:53| 来源: 网络整理| 查看: 265

2021-12-19 出续集啦！！在本文的基础上，实现Matlab制作圣诞树和圣诞快乐歌！欢迎试用！

接着奏乐接着舞 Matlab制作圣诞树和圣诞快乐歌_liu08_13的博客-CSDN博客

0.前言

马上圣诞节了，今天推一篇用MATLAB画圣诞树的，效果如下图所示：

1.准备工作

因为这次用的是MATLAB，不像PYTHON一样需要装一些依赖库，要实现本文的效果，只需安装MATLAB即可。

2.动起手来 2.1 画树

要画圣诞树，首先...画棵树，然后再想办法来点缀它。

close all;clear;clc % setup snow=450; % number of snow flakes [0 .. 5000] % draw tree h=0:0.2:25; %vertical grid [X,Y,Z] = cylinder(tree(h)); %produce a tree formed cylinder Z=Z*25; %scale to the right heigth %Add some diffusion to the surface of the tree to make it look more real treeDiffusion=rand(126,21)-0.5;%some horizontal diffusion data %add diffusion to the grid points for cnt1=1:21 for cnt2=16:126%starting above the trunk %get the angle to always diffuse in direction of the radius angle=atan(Y(cnt2,cnt1)/X(cnt2,cnt1)); %split the diffusion in the two coordinates, depending on the angle X(cnt2,cnt1)=X(cnt2,cnt1)+cos(angle)*treeDiffusion(cnt2,cnt1); Y(cnt2,cnt1)=Y(cnt2,cnt1)+sin(angle)*treeDiffusion(cnt2,cnt1); %some Vertical diffusion for each point Z(cnt2,cnt1)=Z(cnt2,cnt1)+(rand-0.5)*0.5; end end %draw the tree h0 = figure('Units','inches'); pos = h0.Position; pos(1) = 1; pos(2) = 1; pos(3) = 7; pos(4) = 7; h0.Position = pos; surfl(X,Y,Z,'light')

2.2 服道化

下一步，给树打个光，填个色，角度调整一下来点三维效果，把坐标系显示去掉，然后一棵绿油油的树就出现了。

%Use as nice green color map (darker at the bottom, lighter at the top) r=(0.0430:(0.2061/50):0.2491)';%red component g=(0.2969:(0.4012/50):0.6981)';%green component b=(0.0625:(0.2696/50):0.3321)';%blue component map=[r,g,b];%join in a map for cnt=1:6 %change the lower part to brown for the trunk map(cnt,:)=[77,63,5]/265; end colormap(map)%set the map view([-37.5,4])%Change the view to see a little more of the Actual 3D tree lighting phong %some nice lighting shading interp %remove grid and smoothen the surface color axis equal %takes care of display in the right proportion axis([-10 10 -10 10 0 30]) %give some more axis space (for the snow later) axis off %but don't show axis hold on %to draw the rest title('Merry Christmas','color','w',... 'fontsize',25,... 'fontweight','Bold')

接下来，把图像底色调一下，用一个五彩斑斓的黑加点星空蓝当背景（此处在某甲方选手不断提出色彩需求后最终确定的颜色，致谢！）

然后再摆几个小礼物盒子在树下，这过节气氛杠杠的。

set(gcf,'color',[22 32 51]./255) % Presents %Draw some presents around the tree (each with random color) drawPresent(2,-4,0,3,3,2); drawPresent(-4,3,0,2,3,1.5); drawPresent(5,3,0,4,3,3); drawPresent(-14,-5,0,6,3,1); drawPresent(-9,-10,0,2,2,2); drawPresent(0,4,0,4,3,3); drawPresent(-6,-13,0,3,3,3); 2.3 雪花飘飘

最后，关键部分，撒点雪花，再画点彩灯到图上，调整三维图像的角度，来点动画效果，结束战斗！

% Snow %create some random 3D coordinates for the snow (amount as in setup above) snowX=(rand(snow-100,1)*25-12.5); snowY=(rand(snow-100,1)*25-12.5); snowZ=(rand(snow-100,1)*27); color0 = jet(length(snowX)); %Note:Some flakes will end up IN the tree but just can't be seen then for ii = 1:length(snowX) plot3(snowX(ii),snowY(ii),snowZ(ii),'*','color',color0(ii, :),'markersize',randi(15))%plot coordinates as white snow flakes % plot3(snowX(ii),snowY(ii),snowZ(ii),'*','color',color0(ii, :))%plot coordinates as white snow flakes end h=plot3(snowX,snowY,snowZ,'w*'); im = {}; for ii = 1:180 if mod(ii,3) == 0 h.Visible = 'off'; snowX=(rand(snow,1)*25-12.5); snowY=(rand(snow,1)*25-12.5); snowZ=(rand(snow,1)*27); h=plot3(snowX,snowY,snowZ,'w*'); % pause(0.25) else view([ii,4]) % pause(0.1) end if ii > 85 frame = getframe(gcf); im{ii} = frame2im(frame); end end hold off%Done 2.4 输出gif文件

此处有知识点！敲黑板！！如何清除cell数组中的空元素。

im(cellfun(@isempty,im))=[]; file2write = 'chris.gif'; for ii = 1:length(im) [A, map] = rgb2ind( im{ii}, 256); if ii == 1 imwrite(A, map, file2write, 'gif','LoopCount',Inf,'DelayTime', 0.12); else imwrite(A, map, file2write, 'gif','WriteMode','append','DelayTime', 0.12); end end 3.结论

大功告成。

用MATLAB实现一个Bling Bling的圣诞树，祝大家玩得开心。

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搞个气氛 用MATLAB画一棵精致的圣诞树

搞个气氛用MATLAB画一棵精致的圣诞树