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Screen coordinate translation

 
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Storm



Joined: 11 Apr 2006
Posts: 742

PostPosted: Wed Feb 13, 2008 10:29 pm    Post subject: Screen coordinate translation

Taads aatrais jautaajums , vnk kaads varbuut ir saskaaries kaadreiz - vajag paartulkot koordinaatas no sekojosaam:

0,0 1,0

0,1 1,1

uz nepierastaaku formaatu -



edit : laikam jau sanaak viena rotaacija un tad lineaara interpolaacija?
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bubu
Indago Uzvarētājs
Indago Uzvarētājs


Joined: 23 Mar 2004
Posts: 3223
Location: Riga

PostPosted: Wed Feb 13, 2008 10:42 pm    Post subject:

Kas gan tur ir nepierastāks? Pat pamatskolā tādu koordināšu sistemu māca ;)

Anyway - ja tavā rakstītajā pirmais skaitlis ir x, un otrais ir y koordināte, tad man sanāk šitā:
x_new = 2 * x_old - 1
y_new = -2 * y_old - 1

Nezinu gan tikai ko tu tur gribi rotēt..

(vai tad šis neiederas Matemātikas foruma sadaļā?)
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Storm



Joined: 11 Apr 2006
Posts: 742

PostPosted: Wed Feb 13, 2008 10:50 pm    Post subject:

par sadalju jaa, tiesaam.

bet iisti nesanaak, piemeeram visprimitiivaakais

[0,0]
x = 2 * 0 - 1 = -1
y = -2 * 0 - 1 = -1

taatad sanaak [0,0] -> [-1, -1] bet buutu jaasanaak [-1, 1]...
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bubu
Indago Uzvarētājs
Indago Uzvarētājs


Joined: 23 Mar 2004
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Location: Riga

PostPosted: Wed Feb 13, 2008 10:55 pm    Post subject:

Ups, rakstot nokļūdījos zīmē :)
y_new = -2 * y_old + 1
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Storm



Joined: 11 Apr 2006
Posts: 742

PostPosted: Wed Feb 13, 2008 10:57 pm    Post subject:

Vienkaarsi skaisti! Paldies! Smile
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