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Author Topic: Post your Nspire routines here!  (Read 105124 times)

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Offline DJ Omnimaga

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Re: Post your Nspire routines here!
« Reply #45 on: June 21, 2010, 02:37:26 am »
no problem, there are over 6 hours between the posts anyway :P
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Offline fb39ca4

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Re: Post your Nspire routines here!
« Reply #46 on: June 21, 2010, 08:10:55 pm »
It's working now. At first, I thought the bounds would be (1,240) and (1,320), similar to TI-BASIC, but they really start at 0.
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Offline bwang

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Re: Post your Nspire routines here!
« Reply #47 on: June 22, 2010, 04:21:30 pm »
Doesn't BASIC's pixel-On follow those conventions too?
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Offline fb39ca4

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Re: Post your Nspire routines here!
« Reply #48 on: July 05, 2010, 05:54:44 pm »
What is the usage of char* scrbuf in the graphics functions?
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Offline bwang

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Re: Post your Nspire routines here!
« Reply #49 on: July 05, 2010, 06:18:40 pm »
It's a double-buffer, allocated with malloc() in the calling program. It allows for flicker-free animation.
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Offline fb39ca4

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Re: Post your Nspire routines here!
« Reply #50 on: July 06, 2010, 11:58:19 am »
How do you write code using the buffer?
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Offline bwang

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Re: Post your Nspire routines here!
« Reply #51 on: July 06, 2010, 05:02:39 pm »
Like so:
Code: [Select]
char* scrbuf = (char*) malloc(SCREEN_BYTES_SIZE);
line(scrbuf, x1, x2, y1, y2);
refresh(scrbuf);
« Last Edit: July 06, 2010, 05:03:03 pm by bwang »
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Offline fb39ca4

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Re: Post your Nspire routines here!
« Reply #52 on: July 06, 2010, 06:07:29 pm »
BUt what value do I use for scrbuf? Also, is there a way to draw a line directly to the screen?
« Last Edit: July 06, 2010, 06:08:07 pm by fb39ca4 »
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Offline calc84maniac

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Re: Post your Nspire routines here!
« Reply #53 on: July 06, 2010, 06:17:07 pm »
Quote from: fb39ca4 on July 06, 2010, 06:07:29 pm
BUt what value do I use for scrbuf? Also, is there a way to draw a line directly to the screen?
scrbuf isn't a value, it's a pointer. It is defined by the malloc statement. And to draw directly to the screen, you would use (char*)0xA4000100 instead of scrbuf as an argument to the line routine. This buffer might actually be defined somewhere already, but I'm not familiar with the Nspire include files.
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Offline bwang

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Re: Post your Nspire routines here!
« Reply #54 on: July 06, 2010, 07:36:39 pm »
There's really no reason to draw directly to the screen. Drawing to a buffer is faster and more versatile.
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Offline DJ Omnimaga

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Re: Post your Nspire routines here!
« Reply #55 on: July 06, 2010, 08:28:26 pm »
What Bwang said. Plus you won't get flickering when stuff moves around (and needs to be erased to do so). I don't know how Nspire ASM/C compares to 83+ Axe, but on 83+ Axe, inverting the entire screen bit by bit takes about 20-30 seconds for 6144 pixels if you draw directly to the LCD. When storing to the buffer then only updating the screen once everything is done, it took about half a second.
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Offline calc84maniac

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Re: Post your Nspire routines here!
« Reply #56 on: July 06, 2010, 08:59:59 pm »
Quote from: DJ Omnimaga on July 06, 2010, 08:28:26 pm
What Bwang said. Plus you won't get flickering when stuff moves around (and needs to be erased to do so). I don't know how Nspire ASM/C compares to 83+ Axe, but on 83+ Axe, inverting the entire screen bit by bit takes about 20-30 seconds for 6144 pixels if you draw directly to the LCD. When storing to the buffer then only updating the screen once everything is done, it took about half a second.
Well, on Nspire there won't be any speed difference when drawing to the LCD because it is memory-mapped like the TI-85 model and up. There might be some flickering though, if the screen updates while you are drawing your graphics.
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Offline DJ Omnimaga

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Re: Post your Nspire routines here!
« Reply #57 on: July 06, 2010, 09:16:15 pm »
Really? I thought that despite the screen being memory-mapped, there could still be a slight difference? I guess it makes sense that there isn't a speed change if it's really tied directly to the buffer, though.
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Offline bwang

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Re: Post your Nspire routines here!
« Reply #58 on: July 06, 2010, 09:53:48 pm »
"Some flickering" is an understatement. Without double-buffering, animations flicker so much that they are nearly unusable.
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Offline calc84maniac

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Re: Post your Nspire routines here!
« Reply #59 on: July 06, 2010, 09:59:38 pm »
Well, my emulators actually draw directly to the screen buffer.
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