MATLAB画小猪佩琪

好玩的Matlab（NCEPU）

已于 2022-06-06 09:42:30 修改

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分类专栏： matlab 文章标签： matlab 开发语言

于 2022-06-03 23:47:10 首次发布

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本文介绍了如何使用MATLAB结合自定义椭圆函数和阿基米德螺旋线绘制小猪佩奇的图像。通过精心设计的参数和曲线方程，实现了小猪的各个部位，如‘猪尾巴’、‘手脚’、‘身体’等特征。代码逐步展示每个部分的绘制过程，为读者提供了一个有趣的MATLAB图形艺术实践。

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程序分析

绘制小猪佩琪图像主要就是用许多椭圆、线条拼接而成的；为了方便绘制椭圆我自定义一个椭圆函数具体使用方法可以参考之前推文链接EllipseAndCircle函数

椭圆函数

function XY=EllipseAndCircle(varargin)
% author:2377389590@qq.com
% EllipseAndCircle(a,b,x,y,Angle,Rotate,LineColor,LineWidth,PlotType,FillColor,Alpha)
%                a、b ：为长短半径
%                x，y ：圆心坐标
%                Angle ：开始/结束角度
%                Rotate：旋转角度
%                LineColor：线条颜色
%                LineWidth:线宽
%                FillColor ：填充的颜色
%                Alpha：透明度
a=varargin{1};b=varargin{2};
x=varargin{3};y=varargin{4};
Angle=varargin{5};Rotate=varargin{6};
LineColor=varargin{7};
LineWidth=varargin{8};
theta=Angle(1):pi/100:Angle(2);
X=x+a*cos(theta); Y=y+b*sin(theta);
XY=[X;Y]'*[cos(Rotate),-sin(Rotate);sin(Rotate),cos(Rotate)];
if length(varargin)==8||strcmp(varargin{9},'plot' )
    plot(XY(:,1),XY(:,2),'-','color',LineColor,'linewidth',LineWidth);
    hold on; axis equal
elseif length(varargin)==11||strcmp(varargin{9},'fill' )
    try
        FillColor=varargin{10};
        Alpha=varargin{11};
        fill(XY(:,1),XY(:,2),FillColor,'LineWidth',LineWidth,'FaceAlpha',Alpha,'edgecolor',LineColor)
%         hold on; axis equal
    catch
        disp('参数输入错误1')
    end
else
    disp('参数输入错误2')
end
end

“猪尾巴”曲线

为了找到合适的符合“猪尾巴”卷曲的曲线方程，小编把落灰的高数书翻了一遍，最后发现使用阿基米德螺旋线变形方式可以达到类似的效果

$r=a\theta$

clc;clear;close all
theta = -5*pi:0.01*pi:5*pi;
r =0.2*theta;
x = r.*cos(theta);
y = -r.*sin(theta);
plot(x,y,'color','b','LineWidth',1.5)
ax=gca;
ax.TickDir='out';
ax.XMinorTick='on';
ax.YMinorTick='on';
ax.FontSize=14;
ax.LineWidth=1.5;
ax.Box='off';

完整代码

【环境：matlab21b 收藏=学会】

clc;clear;close all;
%======================================
%  Author：好玩的MATLAB
%  Email : 2377389590@qq.com
%  Date  :2022-5-31
%--------------------------------------
ax=gca;
ax.XLim=[-5 5];
ax.YLim=[0 10];
hold on;
% ================猪尾巴==========================
% 使用阿基米德螺旋线变形方式绘制
theta = -pi:0.01*pi:pi;
r =0.2*theta;
x = r.*cos(theta);
y = -r.*sin(theta);
plot(x-2.6871,y+2.7277,'color',[0.98 0.68 0.87],'LineWidth',3)
pause(0.5)
%=================== 左手============================
line([-3.2 -1.7],[3.5 4.3],'Color',[0.85 0.55 0.73],'LineStyle','-','LineWidth',5,'LineJoin','round')
line([-3.3 -2.7],[3.9 3.8],'Color',[0.85 0.55 0.73],'LineStyle','-','LineWidth',5,'LineJoin','round')
line([-3 -2.7],[3.2 3.8],'Color',[0.85 0.55 0.73],'LineStyle','-','LineWidth',5,'LineJoin','round')
pause(0.5)
% ===================右手=============================
line([2.4 1.1],[3.3 4.3],'Color',[0.85 0.55 0.73],'LineStyle','-','LineWidth',5,'LineJoin','round')
line([2 2],[3.53 3.1],'Color',[0.85 0.55 0.73],'LineStyle','-','LineWidth',5,'LineJoin','round')
line([2 2.4],[3.5 3.7],'Color',[0.85 0.55 0.73],'LineStyle','-','LineWidth',5,'LineJoin','round')
pause(0.5)
% ===================左腿===============================
line([-1.4448 -1.4686],[1.8487 0.9921],'Color',[0.85 0.55 0.73],'LineStyle','-','LineWidth',8,'LineJoin','round')
pause(0.5)
% ==================右腿==============================
line([0.4349 0.4349],[1.85 1.0159],'Color',[0.85 0.55 0.73],'LineStyle','-','LineWidth',8,'LineJoin','round')
pause(0.5)
% ==================左脚===============================
EllipseAndCircle(0.6,0.2,-1.1,1,[0,2*pi],0,[0 0 0],2,'fill',[0 0 0],1);
pause(0.5)
% ==================右脚==============================
EllipseAndCircle(0.6,0.2,0.8,1,[0,2*pi],0,[0 0 0],2,'fill',[0 0 0],1);
pause(0.5)
%===================身体==============================
EllipseAndCircle(2.35,5,-0.27,0.4,[0.3,2.861],0,[ 0.71 0.2 0.3],4,'fill',[1 0.35 0.37],1);
pause(0.5)
% ==================耳朵===============================
EllipseAndCircle(0.4,0.63,2.5,8,[0,2*pi],-0.4,[0.85 0.55 0.73],3,'fill',[0.98 0.68 0.87],1);
EllipseAndCircle(0.4,0.63,3.5,7,[0,2*pi],-0.7,[0.85 0.55 0.73],3,'fill',[0.98 0.68 0.87],1);
pause(0.5)
% =================头和嘴巴=========================
EllipseAndCircle(1.9,1.8,-0.27,6,[0,2*pi],0,[0.98 0.68 0.87],2,'fill',[0.98 0.68 0.87],1);
EllipseAndCircle(0.8,0.6,1.8,5.5,[pi,2*pi],-0.3,[ 0.7 0.4 0.58],4,'fill',[0.98 0.68 0.87],1);%嘴巴
EllipseAndCircle(1.3,2.4,-6.5,2.7,[0,2*pi],1.2,[0.98 0.68 0.87],2,'fill',[0.98 0.68 0.87],1);
pause(0.5)
% ==================鼻子=============================
EllipseAndCircle(0.52,0.8,4.58,6.5,[0,2*pi],-0.37,[0.85 0.55 0.73],3,'fill',[0.98 0.68 0.87],1);
EllipseAndCircle(0.1,0.1,1.67,7.67,[0,2*pi],0,[0.85 0.55 0.73],2,'fill',[0.85 0.55 0.73],1);
EllipseAndCircle(0.1,0.1,2.1,7.8,[0,2*pi],0,[0.85 0.55 0.73],2,'fill',[0.85 0.55 0.73],1);
% ==================眼睛=============================
EllipseAndCircle(0.33,0.33,0.22,7.8,[0,2*pi],0,[0.85 0.55 0.73],2,'fill',[1 1 1],1);
EllipseAndCircle(0.33,0.33,-0.6,7.4,[0,2*pi],0,[0.85 0.55 0.73],2,'fill',[1 1 1],1);
EllipseAndCircle(0.1,0.1,-0.5,7.4,[0,2*pi],0,[0 0 0],2,'fill',[0 0 0],1);
EllipseAndCircle(0.1,0.1,0.32,7.8,[0,2*pi],0,[0 0 0],2,'fill',[0 0 0],1);
pause(0.5)
% ==================腮红==============================
EllipseAndCircle(0.6,0.6,-1.4,6,[0,2*pi],0,[ 1 0.55 0.8],4,'fill',[1 0.55 0.8],1);

function XY=EllipseAndCircle(varargin)
% author:2377389590@qq.com
% EllipseAndCircle(a,b,x,y,Angle,Rotate,LineColor,LineWidth,PlotType,FillColor,Alpha)
%                a、b ：为长短半径
%                x，y ：圆心坐标
%                Angle ：开始/结束角度
%                Rotate：旋转角度
%                LineColor：线条颜色
%                LineWidth:线宽
%                FillColor ：填充的颜色
%                Alpha：透明度
a=varargin{1};b=varargin{2};
x=varargin{3};y=varargin{4};
Angle=varargin{5};Rotate=varargin{6};
LineColor=varargin{7};
LineWidth=varargin{8};
theta=Angle(1):pi/100:Angle(2);
X=x+a*cos(theta); Y=y+b*sin(theta);
XY=[X;Y]'*[cos(Rotate),-sin(Rotate);sin(Rotate),cos(Rotate)];
if length(varargin)==8||strcmp(varargin{9},'plot' )
    plot(XY(:,1),XY(:,2),'-','color',LineColor,'linewidth',LineWidth);
elseif length(varargin)==11||strcmp(varargin{9},'fill' )
    try
        FillColor=varargin{10};
        Alpha=varargin{11};
        fill(XY(:,1),XY(:,2),FillColor,'LineWidth',LineWidth,'FaceAlpha',Alpha,'edgecolor',LineColor)
    catch
        disp('参数输入错误1')
    end
else
    disp('参数输入错误2')
end
end