Mouse click callback trigger while drawroifreehand active

I am trying to trigger the mouse click callback on my axes/figure while the drawfreehand function is active. This is for a masking tool I have made in app designer and was hoping to have the software differentiate between a left click (add to mask) and a right click (remove region from mask). The ROI object that results from the drawfreehand is converted to a mask and via logical indexing of the alpha map data in the axes, I either assign the transparency value or a zero so that the region shows up as not masked.

Currently developing this tool in 2022a.

Below is a snippet showing the DrawROI function that I have working recursively so the user can continue to draw regions in the axes to update the masked region(s). The roi handle object is deleted at the start so that the axes dont get overloaded with roi objects.

My buttonDownFcn for the image object in axes is AdjustOn

function DrawROI(app)

% DRAWROI will create the masked region encapsulated by the

% drawn ROI. Values are set according to set mode

try

uiresume(app.UIFigure)

if ~isempty(app.SetMode) && isvalid(app.ax2) && app.EditMode == 3

app.ClearROI

% Only allows the user to draw a freehand while in the

% axes to prevent out of bounds drawing

app.roiH = drawfreehand(app.ax2, 'DrawingArea', [1 1 app.N, app.M]);

app.UpdateUndoStack

app.Points2Mask

app.DrawROI

end

catch ME

id = ME.identifier;

if ~strcmp(id, 'MATLAB:class:InvalidHandle')

throw(ME)

end

end

end

function AdjustOn(app, ~, event)

% ADJUSTON will enable the mask editing and make the initial

% mask edit when the click is first made

switch event.Button

% A left click will add to the mask and a right click will

% subtract from the click - allows for fast edits in place of needing extra buttons in GUI

case 1

app.SetMode = 1;

case 3

app.SetMode = -1;

end

uiresume(app.UIFigure)

% Gets the mask before an edit is done to allow user to undo

% changes

app.UpdateUndoStack

if app.EditMode == 1

% Touches up by changing a single region

app.ClickHeld = true;

app.TouchUpMask

elseif app.EditMode == 2

% Masks a single point

app.ClickHeld = true;

app.PaintPoint

elseif app.EditMode == 4

% Masks the region selected by the animated line

app.ClickHeld = true;

if ~isempty(app.CursorROI)

set(app.CursorROI, 'FaceAlpha', 1)

set(app.CursorROI, 'Color', app.cmask(2,:))

end

app.TurboPaint

elseif app.EditMode == 5

app.ClickHeld = true;

app.SeedGrow

end

end

Answer 1

[Sugandhi]

Hi,

I understand that you are trying to trigger the mouse click callback on my axes/figure while the 'drawfreehand' function is active.

To trigger the mouse, click callback on your axes/figure while the 'drawfreehand' function is active, use the 'WindowButtonDownFcn' property of the figure or axes. This property allows you to define a callback function that will be executed when a mouse button is pressed.

By setting the 'WindowButtonDownFcn' or 'ButtonDownFcn' property and defining the corresponding callback function, you can differentiate between left and right clicks while the 'drawfreehand' function is active and perform the desired actions accordingly.

For more understanding, kindly go through following links:

• WindowButtonDownFcn: https://www.mathworks.com/help/matlab/ref/matlab.ui.figureappd-properties.html