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const int A = 500; /* length of a side of the monitor window */const float = 500; /* length of a side of the cli!!ing rectangle */const float " = 00; /* length of a side of the s$uare the !rogram draws */

%oid m&init'%oid() gl"lear"olor'0.+ 0.+ 0.+ 0.0(; /* gra& ,ac-ground */

glatriode'GL1234"6738(; /* 7n 9orld coordinates: */ glLoad7dentit&'(; /* !osition the cli!!ing rectangle */ glu3rtho' /+ /+ /+ /(;/* at /+ its right edge at /+ its ,ottom */ glatriode'GL3L?79(; /* edge at / and its to! edge at / */

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%oid dis!la&' %oid ()

gl"lear'GL"3L32BB276(; /* clear the window */

glatriode'GL3L?79(; /* 6he following coordinates are e!ressed */

glLoad7dentit&'(; /* in terms of 9orld coordinates */

glegin'GL13LCG38( ; /* draw a filled !ol&gon */ gl"olorDf ' E.0+ 0.D+ 0.(; /* draw in light red */ gl?ertef' "/+ "/ (; /* '+&( */ gl?ertef' "/+ "/ (; /* '+&( */ gl?ertef' "/+ "/ (; /* '+&( */ gl?ertef' "/+ "/ (; /* '+&( */ glnd'(;

glBlush'(; /* send all commands */@

%oid main'int argc+ char** arg%(

) glut7nit'Fargc+arg%(; glut7nit9indowiHe' A+ A (; /* A A !iel screen window */

glut7nitis!la&ode' GL62G I GL678GL(; glut"reate9indow'& 2ectangle(; /* window title */ glutis!la&Bunc'dis!la&(; /* tell 3!enGL main loo! what */ m&init'(; /* set attri,utes */

glutainLoo!'(; /* !ass control to the main loo! */@

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