Under certain circumstances, you might want to generate a TIFF file instead of a PDF file. TIFF files can be displayed on Macs running Mac OS 9 and can be transferred to numerous applications on Windows- or Unix-based systems.
We’ll use the NSImage class to convert the PDF generated in the previous section into a TIFF representation. Then we’ll ask the NSImage instance to write its image, in TIFF format, to a second stream. This second stream will then be saved to the file that the user specifies.
Insert the following TIFFForView:
method declaration into Controller.h
:
- (NSData *)TIFFForView:(NSView *)aView;
Insert the following TIFFForView:
method into
Controller.m
:
- (NSData *)TIFFForView:(NSView *)aView { NSImage *image = [[NSImage alloc] initWithData:[self PDFForView:aView]]; [image autorelease]; return [image TIFFRepresentation]; }
Now that we have our TIFFForView: method to save in TIFF format, how should we invoke it? One way would be to create a second menu item — for example, “Save Graph as TIFF”. But a better (and more common) interface technique is to provide the user with file-format choices in the Save sheet. The way to do this is with an accessory view.
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