2012-02-14, 04:23 AM
Code:
Function distance (x1 as Integer, y1 as Integer, x2 as Integer, y2 as Integer) as Integer
Dim x as Integer
x=Abs(x1-x2)
Dim y as Integer
y=Abs(y1-y2)
Return x+y
End Function
Dim bresx(0 to 300) as UByte
Dim bresy(0 to 300) as UByte
Function line(X1 as Integer,Y1 as Integer,X2 as Integer,Y2 as Integer) as Integer
'Draws a line of individual pixels from X1,Y1 to X2,Y2 at any angle
Dim dist as Integer
dist=distance(X1,Y1,X2,Y2)
dim bresiter as Integer
For bresiter=0 To dist
bresx(bresiter)=0
bresy(bresiter)=0
Next
Dim steep as Byte
steep=Abs(Y2-Y1) > Abs(X2-X1)
PRINT AT 1,1 ; PAPER 1 ; INK 0 ; "steep "+STR(steep)
If steep =1 Then
Dim Temp as Integer
steep=X1
X1=Y1
Y1=Temp
Temp=X2
X2=Y2
Y2=Temp
End If
Dim DeltaX as Integer
DeltaX=Abs(X2-X1)
Dim DeltaY as Integer
DeltaY=Abs(Y2-Y1)
Dim IError as Integer
IError=0
Dim DeltaError as Integer
DeltaError=DeltaY
Dim x as Integer
x=X1 'Start at X1,Y1
Dim y as Integer
y=Y1
Dim XStep as Integer
Dim YStep as Integer
If X1<X2 Then
XStep=1
Else
XStep=-1
end if
If Y1<Y2 Then
YStep=1
Else
YStep=-1 'Direction
end if
'If Steep Then Plot(Y,X) Else Plot(X,Y) 'Draw
Dim iter as Integer=1
While x<>X2
'Print x+" <x "+X2+"<x2"
'Print "xstep "+XStep
'x=truncate(x,1)
x=x+XStep 'Move in X
'Print x+" <x after adding xstep "+X2+"<x2"
IError=IError+DeltaError 'Add to counter
If (IError Shl 1)>DeltaX then 'Would it overflow?
y=y+YStep 'Move in Y
IError=IError-DeltaX 'Overflow/wrap the counter
End if
' x=truncate(x,1)
' y=truncate(y,1)
' Print x+" <x after truncating xstep "+X2+"<x2"
If steep then
bresx(iter)=y
' Print bresx[iter]+"<bresx iter>"+iter
bresy(iter)=x
' Print bresy[iter]+"<bresy iter>"+iter
Else
bresx(iter)=x
' Print bresx[iter]+"<bresx iter>"+iter
bresy(iter)=y
' Print bresy[iter]+"<bresy iter>"+iter
End If
iter=iter+1
If iter>dist then
Print "bresenham over distance "+dist
Return dist
End If
' If Steep Then Plot(Y,X) Else Plot(X,Y) 'Draw
Wend
Return dist
End Function
line(0,0,10,5)
for x=0 to 6
Plot bresx(x),bresy(x)
nextWhen I try to compile it says cant convert to string on line 16 but there are no strings being referred to on that line
EDIT- the problem was on line 107 so the compiler was confused