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 jeff22 |
Screen Size Question |
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Posts: 11 (2009-10-26 13:59:03) |
At the moment I'm reading up on Graphics and Display in the TIGCC Documentation
and have this question.
When programming in C, am I correct in
saying that, whatever object is displayed, it must be based on the screen pixel size of the calculator, in my case 160 x 100 for the TI89 Titanium.
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Kevin Kofler |
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Posts: 7032 (2009-10-26 19:45:38) Admin |
Yes, the graphics functions in the C API always take their coordinates in pixels.
That said, the TI-BASIC instructions are also available from C through the expression stack (the cmd_* functions). But they aren't straightforward to use from C, they take their parameters in expression stack format, you can't pass them a C integer or float directly. |
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jeff22 |
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Posts: 12 (2009-10-27 10:13:12) |
Thanks Kevin for your quick reply
Its as I thought, and I'm happy with using coordinates in pixels. I cant see the need to use TI-Basic instructions for this, as its easy to do the maths to adjust the scale an object to suit the screen pixel display. At the moment I'm still new to C programming, but at some point I will look into using TI-Basic instructions for other purposes. Jeff |
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Lionel Debroux |
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Posts: 3041 (2009-10-27 10:56:25) Former Admin |
FYI, the AMS graphics functions, especially drawing characters and strings, are slow.
If they're fast enough for your purposes, good. If they aren't fast enough, there are external libraries containing many more, and faster, graphics functions (but those take a bit of space in your program, more so than merely calling the built-in ones). |
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jeff22 |
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Posts: 13 (2009-10-27 16:40:41) |
Thanks Lionel
At the moment I'm still learning and just practicing using the tigcclib.h libraries and making my own libraries. I'm not sure about external libraries. I found this on the web - ticalc.org TI assembly libraries. I think this might be for when I'm a bit more advanced. Jeff |
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Lionel Debroux |
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Posts: 3042 (2009-10-28 21:35:01) Former Admin |
http://www.ticalc.org/pub/89/asm/libs/ is usually a good start - but it turns out that it's a bad
choice for both ExtGraph and Genlib, the two graphics libraries that are still maintained
ExtGraph isn't there, and Genlib is highly outdated. |
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Pixel |
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Posts: 39 (2009-10-29 05:19:38) |
Just as a curiosity: Why isn't ExtGraph on that page?
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Lionel Debroux |
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Posts: 3043 (2009-10-29 07:39:59) Former Admin |
Either because it's in another section (in such a case, it's certainly an outdated version anyway), or because neither Tom nor I ever uploaded it to
ticalc
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