Re: How do I pattern an image in a view w/o "scrolling"?

FROM : Michael Watson
DATE : Fri Jul 28 02:28:39 2006

I screwed up one of the rects in the second block of code. It should be:

//--------------------------------------------
// draw image data into a new NSImage, tiling a 10px-wide image
horizontally

NSRect imageTileRect = NSMakeRect(0, 0, 1, [yourOtherImageData
size].height);
NSSize aSize = NSMakeSize(128, 128);
NSRect newImageRect = NSMakeRect(0, 0, aSize.width, aSize.height);
NSImage *newImage = [[NSImage alloc] initWithSize:aSize];

[newImage lockFocus];
[yourOtherImageData drawInRect:newImageRect fromRect:imageTileRect
operation:NSCompositeSourceAtop fraction:1.0];
[newImage unlockFocus];

//--------------------------------------------

The newImage is 128x128, and the tile image that gets repeated is 
10x128. I must've sneezed and gotten confused as to what I was doing.



On 27 Jul, 2006, at 20:18, Michael Watson wrote:
>
> On 27 Jul, 2006, at 19:40, Michael Watson wrote:
>

>> The answer to this is a bit lateral:
>>
>> Let's say we have some image data in memory that is 128x128. We 
>> want to draw it into an NSImage that is 128x128. We can do 
>> something like this:
>>
>> //--------------------------------------------
>> // draw image data into a new NSImage, without any tiling
>>
>> NSSize aSize = NSMakeSize(128, 128);
>> NSRect newImageRect = NSMakeRect(0, 0, aSize.width, aSize.height)
>> NSImage *newImage = [[NSImage alloc] initWithSize:aSize];
>>
>> [newImage lockFocus];
>> [yourOtherImageData drawInRect:newImageRect fromRect:newImageRect 
>> operation:NSCompositeSourceAtop fraction:1.0];
>> [newImage unlockFocus];
>>
>> //--------------------------------------------
>>
>> Let's say, though, that we have a 10x128 image that we want to 
>> tile into a 128x128 square. If we're using NSImage, we can do this 
>> with NSImage to accomplish that:
>>
>> //--------------------------------------------
>> // draw image data into a new NSImage, tiling a 10px-wide image 
>> horizontally
>>
>> NSRect imageTileRect = NSMakeRect(0, 0, 1, [yourOtherImageData 
>> size].height)
>> NSSize aSize = NSMakeSize(10, 128);
>> NSRect newImageRect = NSMakeRect(0, 0, aSize.width, aSize.height)
>> NSImage *newImage = [[NSImage alloc] initWithSize:aSize];
>>
>> [newImage lockFocus];
>> [yourOtherImageData drawInRect:newImageRect fromRect:imageTileRect 
>> operation:NSCompositeSourceAtop fraction:1.0];
>> [newImage unlockFocus];
>>
>> //--------------------------------------------
>>
>>
>> What happens is that you're telling newImage to fill its entire 
>> rect with an image smaller than the newImageRect dimensions, so 
>> NSImage automatically tiles the drawn image.
>>
>>
>> Note: Untested code, written in e-mail, may contain typos or other 
>> errors. But you get the idea.
>>
>> --
>> Michael Watson
>>
>> On 27 Jul, 2006, at 18:16, Alan Smith wrote:
>>

>>> It would help if I knew how to "tile" an NSImage. In your 
>>> explanation
>>> it seems that I just make an NSImage with a 1px wide image and 
>>> I'm all
>>> set. Well, I need the image to repeated over and over again in one
>>> direction, creating a "bar." I can't figure out how to do this with
>>> NSImage.
>>>
>>> Thanks for being so patient, Alan
>>>
>>>
>>> --
>>> // Quotes from yours truly -------------------------
>>> "You don't forget, you just don't remember."
>>> "Maturity resides in the mind."
>>> "Silence is the Universe's greatest gift."
>>> "Don't waste your life doing things others have already done."
>>> _______________________________________________
>>> Do not post admin requests to the list. They will be ignored.
>>> Cocoa-dev mailing list      (<email_removed>)
>>> Help/Unsubscribe/Update your Subscription:
>>> http://lists.apple.com/mailman/options/cocoa-dev/mikey-san%
>>> 40bungie.org
>>>
>>> This email sent to <email_removed>

>>

>