MATLAB製作GUI(6)—GUI中圖像座標獲取①(ginput)

前幾天在用MATLAB寫GUI軟件的過程中遇到了一些問題,在這裏分享一下,今天先講一下第一個問題就是GUI中圖像座標的獲取,今天先介紹第一個方法:ginput函數實現座標的獲取。

其實ginput函數就是獲取鼠標或者光標的圖像輸入,可以獲取圖像上的座標位置以及按鍵屬性,具體使用方法見MATLAB公司的幫助文檔,裏面介紹很詳細:

下面是GIF圖GUI的實現代碼:

function varargout = Getposition(varargin)
% GETPOSITION MATLAB code for Getposition.fig
%      GETPOSITION, by itself, creates a new GETPOSITION or raises the existing
%      singleton*.
%
%      H = GETPOSITION returns the handle to a new GETPOSITION or the handle to
%      the existing singleton*.
%
%      GETPOSITION('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in GETPOSITION.M with the given input arguments.
%
%      GETPOSITION('Property','Value',...) creates a new GETPOSITION or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before Getposition_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to Getposition_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 Getposition

% Last Modified by GUIDE v2.5 08-Apr-2019 13:13:02

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @Getposition_OpeningFcn, ...
                   'gui_OutputFcn',  @Getposition_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 Getposition is made visible.
function Getposition_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 Getposition (see VARARGIN)

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

% Update handles structure
guidata(hObject, handles);

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


% --- Outputs from this function are returned to the command line.
function varargout = Getposition_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;


% --- Executes on button press in pushbutton1.
function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
[pathname filename] = uigetfile({'*.jpg';'*.*'});
if isequal(filename,0)
    warning off
    imshow('trees.tif')
else
    str = [pathname,filename];
    pic = imread(str);
    imshow(pic)
end
axes(handles.axes1)
while(1)
    [x,y] = ginput();
    set(handles.edit1,'string',x);
    set(handles.edit2,'string',y);
end

function edit1_Callback(hObject, eventdata, handles)
% hObject    handle to edit1 (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 edit1 as text
%        str2double(get(hObject,'String')) returns contents of edit1 as a double


% --- Executes during object creation, after setting all properties.
function edit1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit1 (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 edit2_Callback(hObject, eventdata, handles)
% hObject    handle to edit2 (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 edit2 as text
%        str2double(get(hObject,'String')) returns contents of edit2 as a double


% --- Executes during object creation, after setting all properties.
function edit2_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit2 (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

該方法雖然實現簡單,但是存在問題:

①十字光標於整個figure界面顯示,不美觀;

②可以獲取圖像顯示區域以外的座標,不符合使用要求;

③使用死循環進行不斷獲取座標,而死循環具有一定的風險性;

因此,後面將介紹其他方法獲取GUI圖像上的座標信息,大家可以根據使用情況選擇獲取方法~

 

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