Rotating Box

[DrChip]

REM 3d rotating box
REM
REM iPhone 6 plus / 8.2 b5
pi=3.1415
graphics
DIM c(361), s(361)
DIM x(9), y(9), Z(9), x2(9), y2(9), Z2(9), x3(9), y3(9)

FOR i = 1 TO 360
c(i) = COS(i * PI/ 180)
s(i) = SIN(i * PI/ 180)
NEXT i
FOR i = 1 TO 8
READ x(i)
READ y(i)
READ Z(i)
NEXT i

phi = 1
theta = 1
xcenter = Screen_Width()/2
ycenter = Screen_Height()/2
zcenter = 256


main:
refresh off
graphics clear 0,0,0
GOSUB drawbox
refresh on
GOTO main

drawbox:

FOR i = 1 TO 8
x2(i) = -x(i) * s(theta) + y(i) * c(theta)
y2(i) = -x(i) * c(theta) * s(phi) - y(i) * s(theta) * s(phi) - Z(i) * c(phi) + p
Z2(i) = -x(i) * c(theta) * c(phi) - y(i) * s(theta) * c(phi) + Z(i) * s(phi)

x3(i) = 256 * (x2(i) / (Z2(i) + zcenter)) + xcenter
y3(i) = 256 * (y2(i) / (Z2(i) + zcenter)) + ycenter

fill CIRCLE x3(i), y3(i) size 10
NEXT i

draw line x3(1), y3(1) to x3(3), y3(3)
draw LINE x3(1), y3(1) to x3(4), y3(4)
draw line x3(1), y3(1) to x3(5), y3(5)

draw line x3(2), y3(2) to x3(3), y3(3)
draw line x3(2), y3(2) to x3(4), y3(4)
draw line x3(2), y3(2) to x3(6), y3(6)

draw line x3(7), y3(7) to x3(6), y3(6)
draw line x3(7), y3(7) to x3(3), y3(3)
draw line x3(7), y3(7) to x3(5), y3(5)

draw line x3(8), y3(8) to x3(5), y3(5)
draw line x3(8), y3(8) to x3(4), y3(4)
draw line x3(8), y3(8) to x3(6), y3(6)

phi = phi + 1
theta = theta + 1
IF phi > 360 THEN
phi = phi - 360
END IF
IF theta > 360 THEN
theta = theta - 360
END IF

'pause .1

RETURN
'GOTO loop

DATA 50,50,-50
DATA -50,-50,-50
DATA -50,50,-50
DATA 50,-50,-50

DATA 50,50,50
DATA -50,-50,50
DATA -50,50,50
DATA 50,-50,50