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6.112 Point
- Defined in namespace Smalltalk
- Category: Language-Data types
- Beginning of a Point class for simple display manipulation. Has not been
exhaustively tested but appears to work for the basic primitives and for
the needs of the Rectangle class.
6.112.1 Point class: instance creation
- new
- Create a new point with both coordinates set to 0
- x: xInteger y: yInteger
- Create a new point with the given coordinates
6.112.2 Point: accessing
- x
- Answer the x coordinate
- x: aNumber
- Set the x coordinate to aNumber
- x: anXNumber y: aYNumber
- Set the x and y coordinate to anXNumber and aYNumber, respectively
- y
- Answer the y coordinate
- y: aNumber
- Set the y coordinate to aNumber
6.112.3 Point: arithmetic
- * scale
- Multiply the receiver by scale, which can be a Number or a Point
- + delta
- Sum the receiver and delta, which can be a Number or a Point
- - delta
- Subtract delta, which can be a Number or a Point, from the receiver
- / scale
- Divide the receiver by scale, which can be a Number or a Point, with no loss of precision
- // scale
- Divide the receiver by scale, which can be a Number or a Point, with truncation towards -infinity
- abs
- Answer a new point whose coordinates are the absolute values of the receiver's
6.112.4 Point: comparing
- < aPoint
- Answer whether the receiver is higher and to the left of aPoint
- <= aPoint
- Answer whether aPoint is equal to the receiver, or the receiver is higher and to the left of aPoint
- = aPoint
- Answer whether the receiver is equal to aPoint
- > aPoint
- Answer whether the receiver is lower and to the right of aPoint
- >= aPoint
- Answer whether aPoint is equal to the receiver, or the receiver is lower and to the right of aPoint
- max: aPoint
- Answer self if it is lower and to the right of aPoint, aPoint otherwise
- min: aPoint
- Answer self if it is higher and to the left of aPoint, aPoint otherwise
6.112.5 Point: converting
- asPoint
- Answer the receiver.
- asRectangle
- Answer an empty rectangle whose origin is self
- corner: aPoint
- Answer a Rectangle whose origin is the receiver and whose corner is aPoint
- extent: aPoint
- Answer a Rectangle whose origin is the receiver and whose extent is aPoint
- hash
- Answer an hash value for the receiver
6.112.6 Point: point functions
- arcTan
- Answer the angle (measured counterclockwise) between the receiver and a ray starting in (0, 0) and moving towards (1, 0) - i.e. 3 o'clock
- dist: aPoint
- Answer the distance between the receiver and aPoint
- dotProduct: aPoint
- Answer the dot product between the receiver and aPoint
- grid: aPoint
- Answer a new point whose coordinates are rounded towards the nearest multiple of aPoint
- normal
- Rotate the Point 90degrees clockwise and get the unit vector
- transpose
- Answer a new point whose coordinates are the receiver's coordinates exchanged (x becomes y, y becomes x)
- truncatedGrid: aPoint
- Answer a new point whose coordinates are rounded towards -infinity, to a multiple of grid (which must be a Point)
6.112.7 Point: printing
- printOn: aStream
- Print a representation for the receiver on aStream
6.112.8 Point: storing
- storeOn: aStream
- Print Smalltalk code compiling to the receiver on aStream
6.112.9 Point: truncation and round off
- rounded
- Answer a new point whose coordinates are rounded to the nearest integer
- truncateTo: grid
- Answer a new point whose coordinates are rounded towards -infinity, to a multiple of grid (which must be a Number)
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