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>> SPIKA 1: Hebu sasa kuandika mpango
ambayo inahusisha dirisha, a

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mduara, na mshale wangu.

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Hasa, hebu instantiate nyeusi
mzunguko juu ya screen, na kisha

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hebu mafunzo kwa kufuata mshale wangu.

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Basi, ikiwa mimi hoja ya panya wangu, chini, kushoto
au kulia, mzunguko ifuatavyo pamoja.

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>> Hebu kwanza ni pamoja na gevents.h, ili
tuna upatikanaji wa matukio ya graphical.

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Hebu ijayo pamoja gobjects,
hivyo kwamba tuna upatikanaji wa

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vitu kama duru -

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au kwa usahihi zaidi, ovals,
kama tutaweza kuona.

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Na basi ni pamoja na gwindow.h,
hivyo kwamba tuna kupata

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kwa dirisha graphical.

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Next, hebu kutangaza kuu
katika njia ya kawaida.

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Int kuu ni batili.

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Hebu sasa instantiate, au kuunda,
dirisha na GWindow.

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Na tutaweza wito dirisha kutofautiana.

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Anapata newGWindow.

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Na mimi itabidi kiasi fulani kiholela kufanya
dirisha 320 pixels na 240 saizi.

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>> Sasa tunahitaji instantiate
kwamba mduara.

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Naam, zinageuka kuwa mzunguko
ni kesi maalum ya mviringo.

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Ni hivyo tu hutokea kwamba upana na
urefu wa mzunguko ni sawa.

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Basi hebu instantiate
mviringo kama ifuatavyo.

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GOval.

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Tutaweza kuiita mzunguko, ingawa.

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Na kwamba kwenda kupata newGOval.

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Na tunakwenda bayana kwamba ni
itaanza katika juu upande wa kushoto

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kona, ambaye kuratibu
0 comma 0 ni.

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Na upana ya hii dunia
ni kwenda kuwa 50 kwa 50 -

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kwa maneno mengine, mduara.

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>> Sasa tuna dirisha,
tuna mduara.

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Lakini sisi bado aliongeza kuwa
mzunguko wa dirisha.

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Hivyo sisi haja ya kufanya hivyo waziwazi.

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Kuongeza dirisha, mduara.

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Na hivyo kuongeza mwisho
kwa zamani.

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>> Sasa hebu kufanya kitu milele.

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Hebu kukaa katika usio kitanzi,
kusikiliza kwa matukio ya panya.

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Hasa si Clicks, lakini
harakati ya panya.

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Na kukabiliana na harakati za wale
na kusonga mduara.

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Hapa sisi kwenda.

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Wakati kweli.

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Hebu angalia kwa ajili ya tukio na
GEvent, na kuiita tukio hilo.

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Anapata getNextEvent.

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Na hebu hasa kujaribu kupata
tukio panya wa aina fulani.

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Hebu ijayo kuhakikisha kwamba tukio gani
si sawa null, hivyo kwamba kuna

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kweli kitu kwa kujibu.

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>> Na hebu kuangalia ijayo kama getEventType,
kupita katika tukio hilo, ni sawa na MOUSE_MOVED,

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ambayo ni mara kwa mara maalum, alitangaza katika
Stanford Portable Library, kwamba

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kunaashiria kwamba panya
amekwisha wamekuwa wakiongozwa.

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>> Basi hebu kuendelea na
kufanya yafuatayo.

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Kutangaza mara mbili.

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Na mimi itabidi kuiita x.

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Hasa kuhifadhi katika kuwa kurudi
thamani ya getX wa tukio hilo.

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Kwa maneno mengine, mimi kupata
x-kuratibu ya ambapo

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panya wakiongozwa na.

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Lakini tu kufanya line mzunguko up
hasa atop mshale wangu, napenda sasa

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Ondoa mbali upana wa
mzunguko yenyewe kugawanywa na 2.

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Kwa maneno mengine, hebu Ondoa
mbali radius wake.

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>> Hebu kufanya kitu sawa sasa kwa y.

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Y anapata kupata y kuratibu
ya tukio hilo -

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kwamba ni, panya wakiongozwa -

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minus getWidth ya mduara.

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Na wakati huu tutaweza kufanya full
mduara, si radius.

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Hatimaye, hebu kuweka eneo la
mzunguko wa kuwa mpya x comma y.

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Hebu sasa kuokoa, kukusanya,
na kuendesha mpango huu.

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>> Kufanya mshale.

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. / Mshale.

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Kuna mzunguko katika
juu mkono wa kushoto kona.

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Sasa, hebu hoja ya panya yangu juu ya kwamba
dirisha na kuona kama latches mzunguko

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kwenye hilo kama ilivyotarajiwa.

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Na hakika ni gani.

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Taarifa kwamba hasa, mzunguko
ni saa sana juu ya mshale wangu,

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kikamilifu katikati, kwa sababu ya math
hatukuwa kuwashirikisha mduara wake na

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radius wake.

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