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/*
* From. . .
* MyImage.m -- How to rotate an NXImage
*
* This is a subclass of NXImage that supports rotation by overriding
* drawRepresentation:inRect:
*
* 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.
*
* Written by Henry Krempel -- NeXT Developer Support
*
* Wed Apr 10 17:39:50 1991
*/
#import "RotImage.h"
#import <appkit/NXImage.h>
#import <appkit/View.h>
#import <dpsclient/wraps.h>
#import <math.h>
#import "wraps.h"
@implementation RotImage
- initFromStream:(NXStream *)fishImageStream
{
[super initFromStream:fishImageStream];
[self getSize:&origSize];
rotSize.width=origSize.height;
rotSize.height=origSize.width;
currentSize=&origSize;
flipped=0;
return self;
}
- initFromFile:(const char *)fileName
{
[super initFromFile:fileName];
[self getSize:&origSize];
rotSize.width=origSize.height;
rotSize.height=origSize.width;
currentSize=&origSize;
flipped=0;
return self;
}
- initFromSection:(const char *)imageName
{
[super initFromSection:imageName];
[self getSize:&origSize];
rotSize.width=origSize.height;
rotSize.height=origSize.width;
currentSize=&origSize;
flipped=0;
return self;
}
/*
*
* drawRepresentation:inRect: override. Any changes to the PostScript
* transformation matrix can take effect here. Compositing normally ignores
* these changes, but we are doing the transformation before the offscreen
* NXImage is rendered, then compositing this into our visible window.
*
*/
- (BOOL)drawRepresentation:(NXImageRep *)imageRep inRect:(const NXRect *)rect
{
if (NXDrawingStatus == NX_DRAWING) { // Don't do this when printing
PSgsave();
NXSetColor (NX_COLORCLEAR);
NXRectFill (rect);
PSgrestore();
}
/*
* The wrap below translates and rotates to the appropriate starting point,
* based on the rotation state (0 1 2 3) and the angle
*/
PSW_transformToFit(rotation, rotation, origSize.width, origSize.height);
if (flippedHor) PSW_flipHor(origSize.width, origSize.height);
if (flippedVer) PSW_flipVer(origSize.width, origSize.height);
return [super drawRepresentation:imageRep inRect:rect];
}
/*
* Set the rotation of the image. This will be one of 4 values 0..3 for the
* four rotations we do here. We only support these four since the size of
* these rectangles is easy to calculate.
*
*/
- setRotation:(int)anInt
{
NXSize *size;
rotation = anInt;
size=&rotSize;
[self setSize:size];
[self recache];
currentSize=size;
return self;
}
- flip:(int)whichWay;
{
if (whichWay == HORIZONTAL) flippedHor = (flippedHor+1) % 2;
else flippedVer = (flippedVer+1) % 2;
[self recache];
return self;
}
@end
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.