setFixedAspectRatioMode

Preserve aspect ratio when resizing ROI object

setFixedAspectRatioMode is not recommended. With the new ROIs, set the value of the FixedAspectRatio property instead. For more information, see Compatibility Considerations.

Syntax

setFixedAspectRatioMode(h,TF)

Description

example

setFixedAspectRatioMode(h,TF) sets whether the aspect ratio of the ROI object is preserved during interactive resizing.

Examples

Fix Aspect Ratio of Ellipse

Create an ellipse ROI object. Specify a position constraint function using makeConstrainToRectFcn to keep the ellipse inside the boundary of the image.

imshow('coins.png')
h = imellipse(gca,[10 10 100 100]);
fcn = makeConstrainToRectFcn('imellipse',get(gca,'XLim'),get(gca,'YLim'));
setPositionConstraintFcn(h,fcn);

Try resizing and reshaping the ellipse.

Now, fix the aspect ratio of the ellipse.

setFixedAspectRatioMode(h,true);

Try resizing the ellipse. The aspect ratio of the ellipse does not change.

Input Arguments

collapse all

`h` — ROI object
`imellipse` | `imrect`

ROI object, specified as an imellipse or imrect object.

`TF` — Fix aspect ratio
`true` | `false`

Fix the aspect ratio when resizing ROI object, specified as true or false.

Data Types: logical

Compatibility Considerations

expand all

`setFixedAspectRatioMode` is not recommended

Not recommended starting in R2018b

Starting in R2018b, a new set of ROI objects replaces the existing set of ROI objects. The new objects provide more functional capabilities, such as face color transparency. The new classes also support events that you can use to respond to changes in your ROI such as moving or being clicked. Although there are no plans to remove the old ROI objects at this time, switch to the new ROIs to take advantage of the additional capabilities and flexibility. For more information on creating ROIs using the new ROI functions, see ROI Creation Overview.

To control whether an Ellipse or Rectangle ROI maintains the aspect ratio when being resized, use the FixedAspectRatio property of the ROI.

Update Code

Update all instances of setFixedAspectRatioMode method.

Discouraged Usage	Recommended Replacement
This example uses the `setFixedAspectRatioMode` method to preserve the aspect ratio of a rectangle when resizing. imshow('cameraman.tif') h = imrect(gca,[10 10 100 100]); setFixedAspectRatioMode(h,true);	Create a Rectangle ROI, using the new ROI objects, and replace use of the `setFixedAspectRatioMode` method with setting the value of the `FixedAspectRatio` property. To preserve the aspect ration when resizing, set the property to `true`. imshow('camerman.tif') h = drawrectangle(gca,'Position',[10 10 100 100]); h.FixedAspectRatio = true;

Documentation

setFixedAspectRatioMode

Syntax

Description

Examples

Fix Aspect Ratio of Ellipse

Input Arguments

`h` — ROI object
`imellipse` | `imrect`

`TF` — Fix aspect ratio
`true` | `false`

Compatibility Considerations

`setFixedAspectRatioMode` is not recommended

See Also

Image Processing Toolbox Documentation

Support

Documentation

setFixedAspectRatioMode

Syntax

Description

Examples

Fix Aspect Ratio of Ellipse

Input Arguments

h — ROI object imellipse | imrect

TF — Fix aspect ratio true | false

Compatibility Considerations

setFixedAspectRatioMode is not recommended

See Also

Image Processing Toolbox Documentation

Support

`h` — ROI object
`imellipse` | `imrect`

`TF` — Fix aspect ratio
`true` | `false`

`setFixedAspectRatioMode` is not recommended