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cosineh.amosSourceCode
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AMOS Source Code
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1993-01-08
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1KB
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70 lines
Rem Cosine Surface
Screen Open 1,640,256,8,Hires
Wind Open 1,10,10,80,25
PCOL=5
Cls 0
Rem Upper & Lower Limits for Hidden Line Routine
Dim YTOPLINE(640),YBASELINE(640)
For I=1 To 639 : YTOPLINE(I)=255 : Next I
Rem Center Lines for X & Y Axis
XAXIS=320 : YAXIS=127
RHO#=30 : D#=750
THETA#=5.7 : S1#=Sin(THETA#) : C1#=Cos(THETA#)
PHI#=1.1 : S2#=Sin(PHI#) : C2#=Cos(PHI#)
Def Fn Z#(X#)=0.2*Exp(Sin(X#*Y#))
Rem point generating loop
For X#=8 To -12 Step -0.2
FL=0
For Y#=-12 To 12 Step 0.1
Z#= Fn Z#(X#)
Gosub PLTER
Next Y#
Next X#
End
PLTER:
XE#=(-X#*S1#+Y#*C1#)
YE#=(-X#*C1#*C2#-Y#*S1#*C2#+Z#*S2#)
ZE#=(-X#*S2#*C1#-Y#*S2#*S1#-Z#*C2#+RHO#)
SX=Int(D#*(XE#/ZE#)+XAXIS)
SY=Int(-D#*(YE#/ZE#)+YAXIS)
If FL=0
FL=1
Goto DROPOUT
End If
DX=OLDX-SX
If DX=0 Then DX=1
SL=(OLDY-SY)/DX
YP=OLDY
For XP=Int(OLDX)+1 To SX
FG=1
YP=YP+SL
If(XP<0) or(XP>630) Then FG=0 : Goto LOP
If(YP<0) or(YP>250) Then FG=0
If YP<=YTOPLINE(XP)
YTOPLINE(XP)=YP
If FG<>0
Plot XP,YP
End If
If YP=>YBASELINE(XP)
YBASELINE(XP)=YP
If FG=0
Goto LOP
End If
Plot XP,YP
Goto LOP
Else
Goto LOP
End If
End If
If YP>=YBASELINE(XP)
YBASELINE(XP)=YP
If FG=0
Goto LOP
End If
Plot XP,YP
Goto LOP
End If
LOP:
Next XP
DROPOUT:
OLDX=SX : OLDY=SY : Return