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/*
* TiffDocView.m
*
* This file provides the code for the TiffDocView, which is the DocView of
* the ScrollView in the application's main window. The TiffDocView must
* communicate with the image it displays, and be able to redraw itself when
* the image is scrolled.
*
* You may freely copy, distribute, and reuse the code in this example.
* NeXT disclaims any warranty of any kind, expressed or implied, as to its
* fitness for any particular use.
*/
#import "TiffDocView.h"
#import <appkit/NXImage.h>
@implementation TiffDocView
- drawSelf:(const NXRect *)rects :(int)rectCount
{
/*
* "rects" is passed in to drawSelf::. It's a pointer to an array of
* NXRects that describe the area of the TiffDocView that needs to be
* drawn. In this case, we can use the very same NXRects to describe the
* area of the image that must be composited in to the TiffDocView,
* because:
*
* 1.) the NXImage and the TiffDocView are in the same coordinate system,
* and
*
* 2.) we want to render the rect at the same coordinates that it occupies
* in the source image.
*
* Since we're only expecting one rect to be modified by a scrolling
* operation, "rects" actually is a pointer to the one we want.
*
* The composite method requires pointers for its arguments, so we leave
* "rects" as a pointer and take the address of its origin coordinates.
*/
[docImage composite:NX_SOVER fromRect:rects toPoint: &rects->origin];
return self;
}
/* Read in image data from a file */
- readImageFile:(const char *)imageFile
{
NXSize imSize;
/* Remove old NXImage if there is one */
if (docImage != nil)
{
[docImage free];
}
/* Allocate, initialize, and load a new NXImage */
docImage = [[NXImage alloc] initFromFile: imageFile];
/* Find out how big the image is */
[docImage getSize: &imSize];
/* ...and size the TiffDocView to fit. */
[self sizeTo: imSize.width : imSize.height];
/* Invoke drawSelf:, as defined above */
[self display];
return self;
}
@end
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.