花式基于matlab画圣诞树.zip

function christmas % Anselm Ivanovas, [email protected] %Basically just a nice plot for some christmas fun. %3D Plot of a hhristmas tree with some presents and snow %% setup snow=800; % 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 surfl(X,Y,Z,'light') %% View and format %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('HAPPY HOLIDAYS')%self explaining %% 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); %% Snow %create some random 3D coordinates for the snow (amount as in setup above) snowX=(rand(snow,1)*25-12.5); snowY=(rand(snow,1)*25-12.5); snowZ=(rand(snow,1)*27); %Note:Some flakes will end up IN the tree but just can't be seen then plot3(snowX,snowY,snowZ,'w*')%plot coordinates as white snow flakes hold off%Done end % of function %% ============= private functions function r=tree(h)%Gives a profile for the tree for cnt=1:length(h) if(h(cnt)==0)%no Width at the bottom. Ensures a "closed" trunk r(cnt)=0; end %smaller radius for the trunk if (h(cnt)>0 && h(cnt)<=3) r(cnt)=1.5; end %reduce radius gradually from 8 to 0. Note: will only work with a trunk heigth %of 3 and a whole tree heigth of 25. Scale the height of the tree in %the "draw tree" section, since the cylinder command will return a 1 %unit high cylinder anyway if(h(cnt)>3) r(cnt)=8-(h(cnt)-3)*0.3636; end end end % of function %Draws a present with the given coordinate + size in a random color %Note:Given coordinates apply to the lower front + left corner of the %present (the one closest to the viewer) as seen in the plot function drawPresent(dx,dy,dz,scalex,scaley,scalez) %the standard present coordinates presentX=[0.5 0.5 0.5 0.5 0.5; 0 1 1 0 0; 0 1 1 0 0; 0 1 1 0 0; 0.5 0.5 0.5 0.5 0.5]; presentY=[0.5 0.5 0.5 0.5 0.5; 0 0 1 1 0; 0 0 1 1 0; 0 0 1 1 0; 0.5 0.5 0.5 0.5 0.5]; presentZ=[0 0 0 0 0; 0 0 0 0 0; 0.5 0.5 0.5 0.5 0.5; 1 1 1 1 1; 1 1 1 1 1]; %draw some presents with random colors %scale present and move it to the right place and get the plot handle myHandle=surf((presentX*scalex+dx),(presentY*scaley+dy), (presentZ*scalez+dz)); %some random color map randColorMap(:,:,1)=repmat(rand,[5,5]);%r component randColorMap(:,:,2)=repmat(rand,[5,5]);%g component randColorMap(:,:,3)=repmat(rand,[5,5]);%b component %Assign colormap just to the plot handle object of the present, so the tree %does not change color set(myHandle,'CData',randColorMap) shading interp %Nice shding + without grid end % of function