[Gui] Plot "area" not corresponding to an image

I am developing an interface to visualize 3D images. In this way, the user can select the "slice" (sagittal, coronal or transverse) and progress in volume in changing slice's "index".

I used a slider to change slice's index and also used the callback WindowScrollWheelFcn. For this second process, I used the CurrentPoint on my image plot handle to test if mouse is over the image.... and the problem is here ! ...

Take exemple with a data's dimension as 256x256x180. When I plot the 2D slice's image, using imagesc, with a no-square dimension like 256x180, the image is correctly plotted, BUT, it wiil appear my plot "area" as dimension 180x256. This difference between image area and plot area is detected using the WindowScrollWheelFcn and priting the mouse position.

This problem makes that a part of image is not considered inside the image, but a part next to the image it's like inside the image (detected by WindowScrollWheelFcn).

Here some pieces of code:

        %%extract 2D image form 3D volume

        function update_image(self)            
            self.image = [];            
            if (isempty(self.data) || self.index <= 0)
                return;
            end            
            [w, h, d] = size(self.data);            
            switch self.slice
                case 1
                    idx = min(self.index, w);
                    self.image = flipud(squeeze(self.data(idx , : , :))');
                case 2
                    idx = min(self.index, h);
                    self.image = flipud(squeeze(self.data(: , idx , :))');
                case 3
                    idx = min(self.index, d);
                    self.image = squeeze(self.data(: , : , idx));
            end       
        end

        %%update plot with image 2D

        function update_viewer(self)                                    
            if (isempty(self.image))
                return; 
            end
            axes(self.gui_axes);            
            old_w = 0; 
            old_h = 0;
            if (~isempty(self.image_h))
                [old_w, old_h] = size(get(self.image_h, 'CData'));
            end
            [new_w, new_h] = size(self.image);            
            if (old_w ~= new_w || old_h ~= new_h)
                self.image_h = imagesc(self.image, self.clims);
                colormap gray;
                axis off;
                axis image;
                title(self.gui_title);
            else
                set(self.image_h, 'CData', self.image);
            end      
        end

And to get the mouse position :

        function [position] = getMousePosition(self)
            p = get(self.gui_axes, 'CurrentPoint');
            position = p(1, 1:2);
        end

Thanks advence for your help

[Adam]

This sounds like it is just a confusion between (x,y) and (row,column) representations. CurrentPoint is returned as (x,y) which is (column,row) in terms of a plotted image.

Answer 1

[SpongePatoche]

hhhmmm .. it seems that it was as "simple" like that.

So I change :

        function [position] = getMousePosition(self)
            p = get(self.gui_axes, 'CurrentPoint');
            position = p(1, 2:-1:1);
        end

Thanks Adam for your help !

I continue somes tests, I'll be back if seems error persits.