CIPerspectiveTransformWithExtent Class
Definition
Important
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A filter that alters a portion of the total image based on a perspective transform.
public class CIPerspectiveTransformWithExtent : CoreImage.CIPerspectiveTransform, CoreImage.ICIPerspectiveTransformWithExtentProtocol, IDisposabletype CIPerspectiveTransformWithExtent = class
inherit CIPerspectiveTransform
interface ICIPerspectiveTransformWithExtentProtocol
interface INativeObject
interface IDisposable
interface ICIFilterProtocol
interface ICIFourCoordinateGeometryFilterProtocol- Inheritance
- Implements
Remarks
The following example shows this filter in use
// Create the CIImage from a file
CIImage heron = CIImage.FromCGImage (UIImage.FromFile ("heron.jpg").CGImage);
var extent = heron.Extent;
// Create a CIPerspectiveTransformWithExtent filter with the input image
var perspective_transform_with_extent = new CIPerspectiveTransformWithExtent () {
Image = heron,
BottomLeft = new CIVector (extent.Left + 70, extent.Top + 20),
BottomRight = new CIVector (extent.Right - 70, extent.Top - 20),
TopLeft = new CIVector (extent.Left - 70, extent.Bottom - 20),
TopRight = new CIVector (extent.Right + 70, extent.Bottom + 20),
Extent = new CIVector (new float [] {extent.X + 100, extent.Y + 100, extent.Width - 100, extent.Height - 100})
};
// Get the altered image from the filter
var output = perspective_transform_with_extent.OutputImage;
// To render the results, we need to create a context, and then
// use one of the context rendering APIs, in this case, we render the
// result into a CoreGraphics image, which is merely a useful representation
//
var context = CIContext.FromOptions (null);
var cgimage = context.CreateCGImage (output, output.Extent);
// The above cgimage can be added to a screen view, for example, this
// would add it to a UIImageView on the screen:
myImageView.Image = UIImage.FromImage (cgimage);
With the following image input:
Produces the following output:
"canon" © 2012 cuatrok77 hernandez, used under a Creative Commons Attribution-ShareAlike license: https://creativecommons.org/licenses/by-sa/3.0/
Constructors
| Name | Description |
|---|---|
| CIPerspectiveTransformWithExtent() |
Creates a new CIPerspectiveTransformWithExtent with default values. |
| CIPerspectiveTransformWithExtent(NativeHandle) |
A constructor used when creating managed representations of unmanaged objects. Called by the runtime. |
| CIPerspectiveTransformWithExtent(NSCoder) |
A constructor that initializes the object from the data stored in the unarchiver object. |
| CIPerspectiveTransformWithExtent(NSObjectFlag) |
Constructor to call on derived classes to skip initialization and merely allocate the object. |
Properties
| Name | Description |
|---|---|
| AccessibilityAttributedUserInputLabels | (Inherited from NSObject) |
| AccessibilityRespondsToUserInteraction | (Inherited from NSObject) |
| AccessibilityTextualContext | (Inherited from NSObject) |
| AccessibilityUserInputLabels | (Inherited from NSObject) |
| Attributes |
Configurable attributes of the filter. (Inherited from CIFilter) |
| Class | (Inherited from NSObject) |
| ClassHandle |
The Objective-C class handle for this class. (Inherited from CIFilter) |
| DebugDescription | (Inherited from NSObject) |
| Description | (Inherited from NSObject) |
| ExposedBindings | (Inherited from NSObject) |
| Handle |
Handle (pointer) to the unmanaged object representation. (Inherited from NSObject) |
| InputBottomLeft | |
| InputBottomRight | |
| InputExtent |
Gets or sets the region in the source image to transform into the target image. |
| InputImage |
Gets or sets an image to filter. |
| InputKeys |
Gets an array that contains the names of the input keys for the filter. (Inherited from CIFilter) |
| InputTopLeft | |
| InputTopRight | |
| IsDirectBinding | (Inherited from NSObject) |
| IsProxy | (Inherited from NSObject) |
| Item[NSString] |
Gets the value that is identified by |
| Name |
Gets the filter name. (Inherited from CIFilter) |
| OutputImage | |
| OutputKeys |
Gets an array that contains the names of the output keys for the filter. (Inherited from CIFilter) |
| OutputTransform | (Inherited from CIPerspectiveTransform) |
| RetainCount | (Inherited from NSObject) |
| Self | (Inherited from NSObject) |
| Superclass | (Inherited from NSObject) |
| SuperHandle |
Handle used to represent the methods in the base class for this NSObject. (Inherited from NSObject) |
| Zone | (Inherited from NSObject) |