/*

 Copyright (C) 2017 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 This file demonstrates how to subclass -[PDFAnnotation drawWithBox:inContext]

         in order to render our own custom drawing for the MyStampAnnotation subclass

         of PDFAnnotation.

*/ 

// =====================================================================================================================

//  MyStampAnnotation.m

// =====================================================================================================================

#import "MyStampAnnotation.h"

@implementation MyStampAnnotation : PDFAnnotation

// =================================================================================================== MyStampAnnotation

// --------------------------------------------------------------------------------------------------------- drawWithBox

- (void) drawWithBox: (PDFDisplayBox) box

{

    NSImage     *stampImage;

    // Sanity check.

    if( (box < kPDFDisplayBoxMediaBox) || (box > kPDFDisplayBoxArtBox) )

        return;

    // Save.

    [NSGraphicsContext saveGraphicsState];

    // Tranform.

    [self transformContextForBox: box];

    [[NSBezierPath bezierPathWithRect: [self bounds]] setClip];

    // Draw image.

    stampImage = [NSImage imageNamed: @"MyStamp"];

    [[stampImage bestRepresentationForDevice: NULL] drawInRect: [self bounds]];

    // Restore.

    [NSGraphicsContext restoreGraphicsState];

}

// ---------------------------------------------------------------------------------------------- transformContextForBox

- (void) transformContextForBox: (PDFDisplayBox) box

{

    NSAffineTransform   *transform;

    NSRect              boxRect;

    NSInteger           rotation;

    if ([self page] == NULL)

        return;

    // Get the page bounds for box.

    boxRect = [[self page] boundsForBox: box];

    // Identity.

    transform = [NSAffineTransform transform];

    // Handle rotation.

    rotation = [[self page] rotation];

    switch (rotation)

    {

        case 90:

        [transform rotateByDegrees: -90];

        [transform translateXBy: -boxRect.size.width yBy: 0.0];

        break;

        case 180:

        [transform rotateByDegrees: 180];

        [transform translateXBy: -boxRect.size.height yBy: -boxRect.size.width];

        break;

        case 270:

        [transform rotateByDegrees: 90];

        [transform translateXBy: 0.0 yBy: -boxRect.size.height];

        break;

    }

    // Handle origin.

    [transform translateXBy: -boxRect.origin.x yBy: -boxRect.origin.y];

    // Concatenate.

    [transform concat];

}

@end