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Re: Drawing a single pixel

on Sat, 26 May 2001 21:05:23 -0700, Dennis C. De Mars at
email@hidden wrote:

> I could post the source code if anybody's interested as a simple
> example of how to generate an arbitrary bitmap image and display it
> using NSBitmapImageRep.
>
> - Dennis D.

Yes, please post the code! Seems like a lot of overhead just to draw a
pixel, though.

I have a neural network I'm working on and will need to plot error points as
a network learns. Obviously, I'll want any screen draws to be as quick as
possible, but I'd also like them real-time. IOW, I don't want to have to
wait until the whole map is drawn (off screen) to look at it.

Any more hints?

Rock on!
Scott

------
"...there's no such thing as a plain name..."
http://www.domainjane.com



------BEGIN ORIGINAL POST------
>> On Saturday, May 26, 2001, at 08:06 PM, email@hidden wrote:
>>
>>> I wrote a mset fractal program a while back for Mac OS <9 in C. And I would
>>> like to write one in cocoa. Well, I was just wondering how to draw a single
>>> pixel. I guess I could use NSBezier and just make a rect that is 1 pixel
>>> large but I was wondering if there was a way to just do a single pixel.
>>>
>>>
>> You could create a NSImage with a NSBitmapImageRep (you can get at the bitmap
>> data from BitmapImageRep) set the pixel you want then composite this back
>> into
>> your View when appropriate.
>>
> Yes, he needs to use NSBitmapImageRep. However, I believe the reason he
> wants to be able to change a single pixel is because he wants to build a
> fractal picture up pixel by pixel and then display it. In that case, he
> should just set all of the pixels in NSBitmapImageRep's bitmap to the proper
> values and then display that.
>
> I actually have a toy Cocoa program that does exactly this (generate an
> image of the Mandelbrot set and display it). I simply use NSImageView in a
> window. I create an NSBitmapImageRep, set the NSImage's representation to
> this, and write directly into the bitmap. It's very simple to do. I could
> post the source code if anybody's interested as a simple example of how to
> generate an arbitrary bitmap image and display it using NSBitmapImageRep.
>
> - Dennis D.
------END ORIGINAL POST------



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