.TH "point" 3 "Oct 12, 2003"
.SH Point
.PP
.B
Inherits from:

Object
.SH Class Description
.PP
.B
Point
instances are implemented as pairs of two C integers\&.   This is partly because of compatibility with the corresponding ICpak101 class, and partly because it (as opposed to some floating point arithmetic) gives portable results for equality testing\&.
.SH Method types
.PP 
.B
Creation
.RS 3
.br
* new
.br
* x:y:
.RE
.PP 
.B
Instance Variables
.RS 3
.br
* x:y:
.br
* x:
.br
* y:
.br
* x
.br
* y
.RE
.PP 
.B
Comparing
.RS 3
.br
* hash
.br
* isEqual:
.br
* isBelow:
.br
* isAbove:
.br
* isLeft:
.br
* isRight:
.RE
.PP 
.B
Point Arithmetic
.RS 3
.br
* moveBy:
.br
* moveBy::
.br
* moveTo:
.br
* plus:
.br
* translateBy:
.RE
.PP 
.B
Printing
.RS 3
.br
* printOn:
.br
* fileOutOn:
.br
* fileInFrom:
.RE
.SH Methods
.PP 
new
.RS 1
+
.B
new
.RE
.PP
Returns the point (0,0)\&.
.PP 
x:y:
.RS 1
+
.B
x
:(int)
.I
x
.B
y
:(int)
.I
y
.RE
.PP
Returns the point (x,y)\&.
.PP 
x:y:
.RS 1
-
.B
x
:(int)
.I
x
.B
y
:(int)
.I
y
.RE
.PP
Resets the coordinates of an existing point to (x,y)\&.
.PP 
x:
.RS 1
-
.B
x
:(int)
.I
x
.RE
.PP
Resets the 
.I
xLoc
coordinate\&.  Returns the receiver\&.
.PP 
y:
.RS 1
-
.B
y
:(int)
.I
y
.RE
.PP
Resets the 
.I
yLoc
coordinate\&.  Returns the receiver\&.
.PP 
x
.RS 1
- (
int
)
.B
x
.RE
.PP
Returns 
.I
xLoc
as 
.I
int
value\&.
.PP 
y
.RS 1
- (
int
)
.B
y
.RE
.PP
Returns 
.I
yLoc
as 
.I
int
value\&.
.PP 
hash
.RS 1
- (
unsigned
)
.B
hash
.RE
.PP
Returns a hash value based on the values of 
.I
xLoc
and 
.I
yLoc
\&.
.PP 
isEqual:
.RS 1
- (
BOOL
)
.B
isEqual
:
.I
aPoint
.RE
.PP
Returns YES if both arguments are instances of 
.B
Point
(or of a subclass of Point) and if they have the same coordinates\&.
.PP 
isBelow:
.RS 1
- (
BOOL
)
.B
isBelow
:
.I
aPoint
.RE
.PP
Returns YES if the receiver\&'s 
.I
y
coordinate is greater than the 
.I
y
coordinate of 
.I
aPoint
\&.
.PP 
isAbove:
.RS 1
- (
BOOL
)
.B
isAbove
:
.I
aPoint
.RE
.PP
Returns YES if the receiver\&'s 
.I
y
coordinate is less than the 
.I
y
coordinate of 
.I
aPoint
\&.
.PP 
isLeft:
.RS 1
- (
BOOL
)
.B
isLeft
:
.I
aPoint
.RE
.PP
Returns YES if the receiver\&'s 
.I
x
coordinate is less than the 
.I
x
coordinate of 
.I
aPoint
\&.
.PP 
isRight:
.RS 1
- (
BOOL
)
.B
isRight
:
.I
aPoint
.RE
.PP
Returns YES if the receiver\&'s 
.I
x
coordinate is greater than the 
.I
x
coordinate of 
.I
aPoint
\&.
.PP 
moveBy:
.RS 1
-
.B
moveBy
:
.I
aPoint
.RE
.PP
Adds coordinates of 
.I
aPoint
to the receiver\&.  Unlike 
.B
plus:
, this method does not return a new object\&.
.PP 
moveBy::
.RS 1
-
.B
moveBy
:(int)
.I
x
:(int)
.I
y
.RE
.PP
Adds 
.I
x
and 
.I
y
coordinates of 
.I
aPoint
to the receiver\&.  Unlike 
.B
plus:
, this method does not return a new object\&.
.PP 
moveTo:
.RS 1
-
.B
moveTo
:
.I
aPoint
.RE
.PP
Copies the coordinates of 
.I
aPoint
into the receiver\&.  Typically used for translation\&.
.PP 
plus:
.RS 1
-
.B
plus
:
.I
aPoint
.RE
.PP
This method is like 
.B
moveBy:
but it returns a 
.B
new
point instance\&.
.PP 
translateBy:
.RS 1
-
.B
translateBy
:
.I
aPoint
.RE
.PP
This method is like 
.B
moveBy:
but it returns a 
.B
new
point instance\&.
.PP 
printOn:
.RS 1
-
.B
printOn
:(IOD)
.I
aFile
.RE
.PP
Prints 
.I
x
and 
.I
y
coordinates inside parenthesis\&.
.PP 
fileOutOn:
.RS 1
-
.B
fileOutOn
:
.I
aFiler
.RE
.PP
Writes the point on 
.I
aFiler
\&.  Returns the receiver\&.
.PP 
fileInFrom:
.RS 1
-
.B
fileInFrom
:
.I
aFiler
.RE
.PP
Reads the point from 
.I
aFiler
\&.  Returns the receiver\&.