Graphics Review

1. Trace each of the following programs.

a)

for x: 20 .. maxx by 20

drawline(x,0,maxx,maxy,7)

end for

b)

for num: 20 .. maxx by 20

drawline(num,0,0,maxy-num,7)

end for

c)

for y: 20 .. maxx by 20

drawline(y,100,y,300,7)

end for

d)

var x,y:int:=0

var vx,vy:int := 55

loop

x := x + vx

exit when x > maxx

y := y + vy

drawfilloval(x,y,20,20,2)

vy := vy -10

end loop

2. Generate programs to produce each of the following outputs.