polygoncutter.m

自己编写的 matlab gui 可以实现任意多边形定点参数输入 然后使用Sutherland_Hodgeman等算法进行多边形被矩形截取的演示程序

function varargout = Polygoncutter(varargin)
% POLYGONCUTTER M-file for Polygoncutter.fig
%      POLYGONCUTTER, by itself, creates a new POLYGONCUTTER or raises the existing
%      singleton*.
%
%      H = POLYGONCUTTER returns the handle to a new POLYGONCUTTER or the handle to
%      the existing singleton*.
%
%      POLYGONCUTTER('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in POLYGONCUTTER.M with the given input arguments.
%
%      POLYGONCUTTER('Property','Value',...) creates a new POLYGONCUTTER or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before Polygoncutter_OpeningFunction gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to Polygoncutter_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help Polygoncutter

% Last Modified by GUIDE v2.5 09-Nov-2007 21:07:00

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @Polygoncutter_OpeningFcn, ...
                   'gui_OutputFcn',  @Polygoncutter_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT


% --- Executes just before Polygoncutter is made visible.
function Polygoncutter_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to Polygoncutter (see VARARGIN)
zonepoint=str2num(get(handles.zonepointedit,'string'));
x=zonepoint(1);
y=zonepoint(2);
p=str2num(get(handles.polypointedit,'string'));
pp=[p;p(1,:)];
plot(pp(:,1),pp(:,2),'b');hold on;
plot([0 0 x x 0],[0 y y 0 0],'r');hold on;
grid on;


% Choose default command line output for Polygoncutter
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

% UIWAIT makes Polygoncutter wait for user response (see UIRESUME)
% uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = Polygoncutter_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;



function zonepointedit_Callback(hObject, eventdata, handles)
% hObject    handle to zonepointedit (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of zonepointedit as text
%        str2double(get(hObject,'String')) returns contents of zonepointedit as a double


% --- Executes during object creation, after setting all properties.
function zonepointedit_CreateFcn(hObject, eventdata, handles)
% hObject    handle to zonepointedit (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end



function polypointedit_Callback(hObject, eventdata, handles)
% hObject    handle to polypointedit (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of polypointedit as text
%        str2double(get(hObject,'String')) returns contents of polypointedit as a double


% --- Executes during object creation, after setting all properties.
function polypointedit_CreateFcn(hObject, eventdata, handles)
% hObject    handle to polypointedit (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end


% --- Executes on button press in exe.
function exe_Callback(hObject, eventdata, handles)
% hObject    handle to exe (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
format short;
h=findobj('color','b');
delete(h);
h=findobj('color','g');
delete(h);
h=findobj('color','k');
delete(h);

zonepoint=str2num(get(handles.zonepointedit,'string'));
x=zonepoint(1);
y=zonepoint(2);
p=str2num(get(handles.polypointedit,'string'));
[row,len]=size(p);
p=reshape(p,(row*len/2),2);
pp=[p;p(1,:)];
plot(pp(:,1),pp(:,2),'b');hold on;
plot([0 0 x x 0],[0 y y 0 0],'r');hold on;
grid on;

error=0.0001;
[n,dim]=size(p);

j=1;
i=str2num(get(handles.edgechange,'string'));
for k=1:n+1
    bit2and=2^(i-1);
    temp(k)=getzonecode(zonepoint,pp(k,:));  %get the all the point's code grouped by 1st line
    code(k)=bitand(temp(k),bit2and);
end
    
for k=1:n
    judge1=bitand(code(k),code(k+1));
    if judge1~=0     %this line is totally unvisible,record no points
    else
        if code(k)==0&&code(k+1)==0   %this line is totally visible,keep the terminal point
        output(j,:)=pp(k+1,:);
        j=j+1;
        
        elseif code(k)==0&&code(k+1)~=0   %this line has only p1 in area while p2 outside
        sectpoint=intersectp(pp(k,:),pp(k+1,:),zonepoint,error,bit2and,0);
        output(j,:)=sectpoint;
        j=j+1;
            
        else %this line has only p2 in area while p1 outside
        sectpoint=intersectp(pp(k,:),pp(k+1,:),zonepoint,error,bit2and,1);
        output(j,:)=sectpoint;
        j=j+1;
        output(j,:)=pp(k+1,:);
        j=j+1;
        end
    end
end
output=[output;output(1,:)];
[row,len]=size(output);
polypoint=reshape(output,1,row*len);
polystr=num2str(polypoint);
set(handles.polypointedit,'string',polystr);
plot(output(:,1),output(:,2),'k *');hold on;
plot(output(:,1),output(:,2),'g -.');hold on;
axis auto;
i=i+1;
set(handles.edgechange,'string',i);
if i==5
    set(handles.exe,'enable','off');
    h=findobj('color','b');
    delete(h);
end

% --- Executes on button press in credit.
function credit_Callback(hObject, eventdata, handles)
% hObject    handle to credit (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
set(handles.zonepointedit,'string','10 10');
set(handles.polypointedit,'string','5 15;15 10;5 -5;-2 5');
delete(get(handles.axes,'children'));
set(handles.exe,'enable','on');
set(handles.edgechange,'string','1');




function edgechange_Callback(hObject, eventdata, handles)
% hObject    handle to edgechange (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edgechange as text
%        str2double(get(hObject,'String')) returns contents of edgechange as a double


% --- Executes during object creation, after setting all properties.
function edgechange_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edgechange (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end





function saver_Callback(hObject, eventdata, handles)
% hObject    handle to saver (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of saver as text
%        str2double(get(hObject,'String')) returns contents of saver as a double


% --- Executes during object creation, after setting all properties.
function saver_CreateFcn(hObject, eventdata, handles)
% hObject    handle to saver (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end