Question

Edited Post

These are the new functions that I have created using your template to help me out.
What is happening is though the code works fine, the ‘check for cursor’ boxes are not over top of the axes. In fact they are very far off. I used disp(axPos) once with set(hAx, ‘Units’,’pixels’), and once with it commented out. It displayed:

1.

 169.0000   71.0000  126.0000   51.0000
 94.0000  122.0000  126.0000   51.0000
 19.0000   71.0000  126.0000   51.0000
 94.0000   20.0000  126.0000   51.0000

Which is the GUIDE co ordinates of the axis but not the co ordinates that are being displayed for ‘Currentpoint’

2.

33.6000    5.3846   25.2000    3.9231
18.6000    9.3077   25.2000    3.9231
3.6000    5.3846   25.2000    3.9231
18.6000    1.4615   25.2000    3.9231

I do not know where these come from but are closer to where they need to be but are ~60 pixels to the left.

Here is the code:

function HVACSM_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 HVACSM (see VARARGIN)

% Choose default command line output for HVACSM
handles.output = hObject;
NUM = 4;

imgOff1 = imread('cond.png');
imgOn1 = imread('condH.png');

imgOff2 = imread('comp.png');
imgOn2 = imread('compH.png');

imgOff3 = imread('evap.png');
imgOn3 = imread('evapH.png');

imgOff4 = imread('exp.png');
imgOn4 = imread('expH.png');

imgOff = cell(1,NUM);
imgOff{1} = imgOff1;
imgOff{2} = imgOff2;
imgOff{3} = imgOff3;
imgOff{4} = imgOff4;

imgOn = cell(1,NUM);
imgOn{1} = imgOn1;
imgOn{2} = imgOn2;
imgOn{3} = imgOn3;
imgOn{4} = imgOn4;

%# setup axes
hAx = zeros(1,NUM);
hImg = zeros(1,NUM);
hAx = [handles.axes1 handles.axes2 handles.axes3 handles.axes4];
hImg(1) = imagesc(imgOff{1}, 'Parent',hAx(1));
hImg(2) = imagesc(imgOff{2}, 'Parent',hAx(2));
hImg(3) = imagesc(imgOff{3}, 'Parent',hAx(3));
hImg(4) = imagesc(imgOff{4}, 'Parent',hAx(4));
set(hAx, 'XTick',[], 'YTick',[],'Box', 'on')

%# get corner-points of each axis
set(hAx, 'Units','pixels')
axPos = cell2mat( get(hAx,'Position') );
disp(axPos)
p = zeros(5,2,NUM);
for k=1:NUM
    p(:,:,k) = bsxfun(@plus, axPos(k,1:2), ...
        [0 0; axPos(k,3) 0; axPos(k,3:4); 0 axPos(k,4); 0 0]);
end
handles.p = p;
handles.hAx = hAx;
handles.hImg = hImg;
handles.imgOff = imgOff;
handles.imgOn = imgOn;
% Update handles structure
guidata(hObject, handles);



function figure1_WindowButtonMotionFcn(hObject, eventdata, handles)
% hObject    handle to figure1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

pos = get(hObject,'CurrentPoint');%CurrentPoint
posx = pos(1); posy = pos(2);

%Display to check to see if the position is working
posx = num2str(posx);
posy = num2str(posy);

set(handles.Xpos,'String',posx);
set(handles.Ypos,'String',posy);

p = handles.p;
hImg = handles.hImg;
hAx = handles.hAx;
imgOff = handles.imgOff;
imgOn = handles.imgOn;


%# for each axis, determine if we are inside it
    for i=1:numel(hImg)
        if inpolygon(pos(1),pos(2), p(:,1,i),p(:,2,i))
            set(hImg(i), 'CData',imgOn{i})
            set(hAx(i), 'LineWidth',3, 'XColor','r', 'YColor','r')
        else
            set(hImg(i), 'CData',imgOff{i})
            set(hAx(i), 'LineWidth',1, 'XColor','k', 'YColor','k')
        end
    end

These are the hitboxes is with the original code “set(hAx, ‘Units’,’pixels’)”

Note* the others are way off the screen to the top right, or would be.

These are the hitboxes with the altered code “set(hAx, ‘Units’,’characters’)”

Note* This is the exact same thing that happens when the code is commented out.

Tested Aug 2
.

.

.

.

Addendum Original Post

I am getting this error after running my GUI [Fatal Error] :-1:-1: Premature end of file.

It happens during this block of code:

function figure1_WindowButtonMotionFcn(hObject, eventdata, handles)

% hObject handle to figure1 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

pos = get(hObject,'CurrentPoint');

%CurrentPoint

posx = pos(1); posy = pos(2);

%Display to check to see if the position is working

posx = num2str(posx); posy = num2str(posy);

 set(handles.Xpos,'String',posx); set(handles.Ypos,'String',posy);

%If mouse over then update the immage

if ((115 < pos(1)) && (pos(1) < 125) && (7 < pos(2)) && (pos(2) < 11))
axes(handles.axes1);
imshow('condH.png')  
else 
 axes(handles.axes1);
imshow('cond.png')

 end

 if ((90 < pos(1)) && (pos(1) < 100) && (7 < pos(2)) && (pos(2) < 11))
 axes(handles.axes2);
 imshow('compH.png')  
 else
axes(handles.axes2);
 imshow('comp.png')  
 end

if ((80 < pos(1)) && (pos(1) < 90) && (7 < pos(2)) && (pos(2) < 11))
axes(handles.axes3);
imshow('evapH.png')  
else
 axes(handles.axes3);
 imshow('evap.png')  
 end

if ((90 < pos(1)) && (pos(1) < 100) && (2 < pos(2)) && (pos(2) < 5))
axes(handles.axes4);
imshow('expH.png')  
else
 axes(handles.axes4);
 imshow('exp.png')  
end

Normally the GUI runs fine until I trigger one of the if statements by mousing over the predetermined box. Then the GUI stops responding and will not open again until Matlab is restarted.

Answer 1

It is difficult to tell why MATLAB is crashing without seeing your entire code. For this reason, I wrote the short example below. It illustrates how I would to write a GUI that simulates the rollover effect using the WindowButtonMotionFcn callback:

function testRolloverGUI()
    %# prepare rollover image
    imgOff = imread('coins.png');
    imgOn = imcomplement(imgOff);

    %# setup figure
    hFig = figure('Resize','off', 'MenuBar','none', 'Color','w');
    set(hFig, 'WindowButtonMotionFcn',@figWindowButtonMotionFcn);
    hTxt = uicontrol('Style','text', 'String','(0,0)');

    %# setup axes
    NUM = 4;
    hAx = zeros(1,NUM);
    hImg = zeros(1,NUM);
    for k=1:NUM
        hAx(k) = subplot(2,2,k);
        hImg(k) = imagesc(imgOff, 'Parent',hAx(k));
    end
    colormap(gray)
    set(hAx, 'XTick',[], 'YTick',[], 'Box','on')

    %# get corner-points of each axis
    set(hAx, 'Units','pixels')
    axPos = cell2mat( get(hAx,'Position') );
    p = zeros(5,2,NUM);
    for k=1:NUM
        p(:,:,k) = bsxfun(@plus, axPos(k,1:2), ...
            [0 0; axPos(k,3) 0; axPos(k,3:4); 0 axPos(k,4); 0 0]);
    end

    %# callback function
    function figWindowButtonMotionFcn(hObj,ev)
        %# get mouse current position
        pos = get(hObj, 'CurrentPoint');
        set(hTxt, 'String',sprintf('(%g,%g)',pos))

        %# for each axis, determine if we are inside it
        for i=1:numel(hImg)
            if inpolygon(pos(1),pos(2), p(:,1,i),p(:,2,i))
                set(hImg(i), 'CData',imgOn)
                set(hAx(i), 'LineWidth',3, 'XColor','r', 'YColor','r')
            else
                set(hImg(i), 'CData',imgOff)
                set(hAx(i), 'LineWidth',1, 'XColor','k', 'YColor','k')
            end
        end
    end
end

---

EDIT#2

In response to your comments, I recreated the example in GUIDE. Here are the main parts:

%# --- Executes just before rollover is made visible.
function rollover_OpeningFcn(hObject, eventdata, handles, varargin)

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

    %# allocate
    NUM = 4;
    imgOff = cell(1,NUM);
    imgOn = cell(1,NUM);
    hImg = zeros(1,NUM);

    %# read images
    imgOff{1} = imread('coins.png');
    imgOn{1} = imcomplement(imread('coins.png'));
    imgOff{2} = imread('coins.png');
    imgOn{2} = imcomplement(imread('coins.png'));
    imgOff{3} = imread('coins.png');
    imgOn{3} = imcomplement(imread('coins.png'));
    imgOff{4} = imread('coins.png');
    imgOn{4} = imcomplement(imread('coins.png'));

    %# setup axes
    hAx = [handles.axes1 handles.axes2 handles.axes3 handles.axes4];
    for i=1:NUM
        hImg(i) = imagesc(imgOff{i}, 'Parent',hAx(i));
    end
    colormap(hObject, 'gray')
    set(hAx, 'XTick',[], 'YTick',[], 'Box','on')

    %# make sure axes units match that of the figure
    set(hAx, 'Units',get(hObject, 'Units'))

    %# check axes parent container (figure or panel)
    hAxParents = cell2mat( get(hAx,'Parent') );
    idx = ismember(get(hAxParents,'Type'), 'uipanel');
    ppos = cell2mat( get(hAxParents(idx), 'Position') );

    %# adjust position relative to parent container
    axPos = cell2mat( get(hAx,'Position') );
    axPos(idx,1:2) = axPos(idx,1:2) + ppos(:,1:2);

    %# compute corner-points of each axis
    p = zeros(5,2,NUM);
    for k=1:NUM
        p(:,:,k) = bsxfun(@plus, axPos(k,1:2), ...
            [0 0; axPos(k,3) 0; axPos(k,3:4); 0 axPos(k,4); 0 0]);
    end

    %# store in handles structure
    handles.p = p;
    handles.hAx = hAx;
    handles.hImg = hImg;
    handles.imgOff = imgOff;
    handles.imgOn = imgOn;

    %# Update handles structure
    guidata(hObject, handles);


%# --- Executes on mouse motion over figure - except title and menu.
function figure1_WindowButtonMotionFcn(hObject, eventdata, handles)

    %# CurrentPoint
    pos = get(hObject,'CurrentPoint');
    set(handles.text1,'String',sprintf('(%g,%g)',pos));

    %# for each axis, determine if we are inside it
    for i=1:numel(handles.hImg)
        if inpolygon(pos(1),pos(2), handles.p(:,1,i),handles.p(:,2,i))
            set(handles.hImg(i), 'CData',handles.imgOn{i})
            set(handles.hAx(i), 'LineWidth',3, 'XColor','r', 'YColor','r')
        else
            set(handles.hImg(i), 'CData',handles.imgOff{i})
            set(handles.hAx(i), 'LineWidth',1, 'XColor','k', 'YColor','k')
        end
    end

The GUI has basically the same components as before, except that the axes are contained inside a uipanel (similar to the screenshot of your GUI):

A few things to note:

• Since our goal is to compare the figure’s CurrentPoint to the axes position, it is important that they have the same Units as that of the figure, thus: set(hAx, 'Units',get(hObject, 'Units'))

• According to the documentation, an axis Position property is relative to its parent container, and because the four axes are inside a panel, we need to adjust their positions accordingly: axPos(idx,1:2) = axPos(idx,1:2) + ppos(:,1:2);