Matlab basic drawing-random snow scene drawing

The functions used by this program are all basic functions such as fill scatter plot in matlab, but the understanding of the code requires a certain degree of proficiency in the use of matrices. The snow scene drawn by this program will adjust itself within a certain range, and there will be problems every time it runs. The same surprise! !

Show results:

Complete code:

function snowCover
MainFig=figure('units','pixels','position',[300 80 500 500],...
    'Numbertitle','off','menubar','none','resize','off',...
    'name','snow covered landscape');
axes('parent',MainFig,'position',[0 0 1 1],...
    'XLim', [0 500],...
    'YLim', [0 500],...
    'NextPlot','add',...
    'layer','bottom',...
    'Visible','on',...
    'Color',[0 59 129]./255,...
    'XTick',[], ...
    'YTick',[]);
hold on

%画雪地====================================================================
layerBEPos=[150;140;100;90];
layerColor=[146 210 245;101 183 231;0 101 181;0 59 129];
excursion=15;
interval=10;
xSep=25;

layerPos=zeros(size(layerBEPos,1),length(xSep:xSep:500));
layerPos(:,1)=layerBEPos(:,1);

for i=1:size(layerBEPos,1)
    for j=xSep:xSep:500
        listPos=round(j./xSep+1);
        tempRandi=randi([-excursion,excursion]);
        yPos=tempRandi+layerPos(i,listPos-1);
        if i>1&&yPos>=layerPos(i-1,listPos)-5
            yPos=layerPos(i-1,listPos)-interval;
        end
        yPos(yPos<0)=0;
        layerPos(i,listPos)=yPos;
    end   
end

for i=1:size(layerBEPos,1)
    XData=0:xSep:500;
    YData=layerPos(i,:);
    Yq=interp1(XData,YData,0:1:500,'spline');
    Xq=[0,0:1:500,500];
    Yq=[0 Yq 0];
    fill(Xq,Yq,layerColor(i,:)./255,'EdgeColor','none')
end

%画星星====================================================================
XRandiS=randi([50 450],[1,15]);
YRandiS=randi([300 460],[1,15]);
scatter(XRandiS,YRandiS,10,'o','filled','CData',[252 241 0]./255)

XRandiB=randi([50 450],[1,15]);
YRandiB=randi([300 460],[1,15]);
scatter(XRandiB,YRandiB,18,'o','filled','CData',[252 241 0]./255)

%画雪花====================================================================
snowXpos=[randi([0,30],[1,6]),randi([470,500],[1,6]),randi([0,500],[1,12])];
snowYpos=[randi([220,470],[1,6]),randi([220,470],[1,6]),randi([470,500],[1,12])];
snowSize=randi([25,50],[1,24]);
snowAngle=2*pi*rand([1,24]);
snowWidth=1+0.6*rand([1,24]);

for i=1:24
    drawSnow(snowXpos(i),snowYpos(i),snowSize(i),snowAngle(i),snowWidth(i))
end
%画月亮====================================================================
moonPos=[320 300]+[randi([0 50]),randi([0 80])];
moonSize=randi([28 32]);

blankPos=randi([floor(0.3*moonSize) ceil(0.5*moonSize)],[1,2]);
drawMoon(moonPos(1),moonPos(2),moonSize,moonPos(1)-blankPos(1),moonPos(2)+blankPos(2))

%相关函数==================================================================
    function drawMoon(x,y,R,bx,by)
        t=0:pi/50:2*pi;
        X=x+cos(t).*R;
        Y=y+sin(t).*R;
        BX=bx+cos(t).*R;
        BY=by+sin(t).*R;
        fill(X,Y,[255 251 219]./255,'EdgeColor','none')
        fill(BX,BY,[0 59 129]./255,'EdgeColor','none')
    end


    function drawSnow(x,y,len,angle,width)
        for theta=0:pi/3:2*pi-pi/3
            xTail=cos(theta+angle)*len+x;
            yTail=sin(theta+angle)*len+y;
            plot([x,xTail],[y,yTail],'color',[0 134 207]./255,'lineWidth',width)
            for branchRatio=[0.4 0.55 0.7]
                BX=x+cos(theta+angle)*len*branchRatio;
                BY=y+sin(theta+angle)*len*branchRatio;
                LX=BX+cos(theta+angle+pi/3).*len.*0.4;
                LY=BY+sin(theta+angle+pi/3).*len.*0.4;
                RX=BX+cos(theta+angle-pi/3).*len.*0.4;
                RY=BY+sin(theta+angle-pi/3).*len.*0.4;
                plot([BX,LX],[BY,LY],'color',[0 134 207]./255,'lineWidth',width.*0.8)
                plot([BX,RX],[BY,RY],'color',[0 134 207]./255,'lineWidth',width.*0.8)
            end
        end
    end


end

Note:

• At present, it has not been studied how to generate the claw-shaped tree randomly. If there are ideas, the program may be improved.
• The uneven ground in the figure is generated by a series of randomly generated points through cubic spline interpolation.
• The moon in the picture is actually obtained by overlapping two circles of different colors, one of which has the same color as the background color.