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RotateAngle Property (ImageViewer)

Summary

Gets or sets the value of the rotation angle to use when displaying the image.

Syntax

Java

Objective-C

WinRT C#

public double RotateAngle {get; set;}

Public Property RotateAngle As Double

public double RotateAngle {get; set;}

@property (nonatomic, assign) double rotateAngle

public float getRotateAngle() 
public void setRotateAngle(float angle)

  
get_RotateAngle(); 
set_RotateAngle(value); 
Object.defineProperty('RotateAngle');

Property Value

The rotation angle for the image display, in degrees. The default value is 0.

Remarks

Changing the value of this property will fire the PropertyChanged and TransformChanged events.

This is a display value and the image data will not be changed, only the value of Transform matrix is changed.

Rotating an image is similar to rotating a rectangle, the values of "width" and "height" might change. When you rotate the image using the RotateAngle property. For example, if you have an image that is 100 by 200 pixels and you rotate it by 90 degrees clock wise, the new image size should be 200 by 100 pixels. Then the viewer will rotate the image around 0,0 and translate it to come up with a transformation that will show the image in this position. The new scroll area will be adjusted according to the image's new size (200, 100).

Example

WinRT C#

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Controls; 
 
public void RotateAngleExample() 
{ 
   // Rotate by 30 
   _viewer.RotateAngle = _viewer.RotateAngle + 15; 
   _infoLabel.Text = "Angle: " + _viewer.RotateAngle; 
}

Requirements

Target Platforms

Reference

ImageViewer Class

ImageViewer Members

Help Version 19.0.2017.10.28