Angle Calculation Help

[ACagliano]

I had an old program that I made in TI-Basic. I have wanted to convert it into z80 for a while. It was a Lewis Structures drawing program. It several shortcomings: (1) it could not handle drawing off-screen, and (2) It could only handle formulas with one central atom, and the others around it. (NH4, for instance).

I want to redo this. In z80. So, I'm asking the following questions:

1. How do I calculate angle degrees in z80? When drawing Lewis Structures, spare electrons must be accounted for by leaving one space. For instance, in a water molecule, you know that it is a bent molecule. Because of the electrons left unbonded on the hydrogen, the oxygen molecules are pushed to the opposite side, at 90 degree angles to each other. Understand what I'm asking? Or maybe someone who knows more about this can explain better?

2. How do I make the program able to scroll to the left or right of the display in order to show offscreen parts? Would the DCS GUI features be best for this?


Any help I could get would be great. I'd be willing to co-author the project with someone who knows how draw Lewis Structures , who could handle the technicalities of calculating and drawing.
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-ACagliano

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[KermMartian]

What do you mean by calculating angle degrees, exactly? Turning radians into degrees? Turning degrees into X and Y? If you mean the latter, I have some fixed-point trigonometric routines from Obliterate that I could contribute to the project. For the second question, I definitely think the DCS GUI would be the best. Just construct the whole thing in an offscreen buffer, then use a scrollbar with callbacks to select which part is shown at a time.
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[seana11]

[ACagliano]

[souvik1997]

If you have the coordinate for the central atom, you would use the unit circle to find points around it with an angle. Once you have routines for sine and cosine, it shouldn't be too hard.
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deviantArt

[KermMartian]

[ACagliano]

Thanks Kerm. To be honest, the only angles I really need to be able to draw are multiples of 360/8 (I think), since a valence orbital can only hold a maximum of eight electrons.

Now, for any of you chemistry people here, how do you determine which atoms form the central atoms of the molecule or chain and which go around the central atoms?


Oh, I need help with one routine. I need to parse a sector of memory from Label "ElementDataTable" forward. I need to look for a one or two byte search string. But the issue is this... take C and Co for example. If I search C, the element database lists it as "C_", where _ is a blank space. I can't have it return every element starting with C. 0x5.
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-ACagliano

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Legend of Zelda. "Ganon's Rage"
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[christop]

[ACagliano]

I no longer need help with the above...I can handle it. But, i do need to ask... DCS_GUI-wise. To render the molecule on the screen and have it scrollable, what GUI functions would I use? I know the horiz and vert scrollbars, but what sprite function would I use?

Edit: Wait, I can't even do that, because the molecule is rendered on the basis of the molecule data. The molecule data has this format:

byte 0 [Atomic number]
byte 1 [# of lone pairs]
byte 2 [charge]
byte 3 [flags xx112234]
byte 4 [bonded id 1]
byte 5 [bonded id 2]
byte 6 [bonded id 3]
byte 7 [bonded id 4]
byte 8 [bonded id 5]
byte 9 [bonded id 6]
byte 10 [display x]
byte 11 [display y]

Where bytes 10 and 11 control the position of that atom on the large buffer. And bytes 4-9 are pointers to the structures of the atoms bonded to that atom.
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-ACagliano

Current Projects

Legend of Zelda. "Ganon's Rage"
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[KermMartian]

Would you mind helping me understand where the question is in all that? I see you asked about a sprite routine, but then you seem to have gone on to detail the structure of your database.
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[ACagliano]

[KermMartian]

[arriopolis]

[ACagliano]

[arriopolis]

The nice thing about molecules is that they have multiple structural formulas for one moleculair formula. Those different molecules are called "isomeres" (at least they do in the Netherlands). For example, if you have "butaan", C4H10, that comes in:

[KermMartian]

(We call that "Butane" ). And indeed, the chemical formula doesn't tell you much about the structure of a particular molecule, unfortunately.
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