NAME

Point - coordinate position

SYNOPSIS

include    "draw.m";
draw := load Draw Draw->PATH;
Point: adt
{


    x:    int;


    y:    int;


    add:  fn(p: self Point, q: Point):  Point;


    sub:  fn(p: self Point, q: Point):  Point;


    mul:  fn(p: self Point, i: int):    Point;


    div:  fn(p: self Point, i: int):    Point;


    eq:   fn(p: self Point, q: Point):  int;


    in:   fn(p: self Point, r: Rect):   int;
};

DESCRIPTION

The Point data type specifies a position in the integer grid.

x, y

The coordinate position. The coordinates increase to the right (x) and down (y).

p.add(q)

Returns the point (p.x+q.x, p.y+q.y).

p.sub(q)

Returns the point (p.x-q.x, p.y-q.y).

p.mul(i)

Returns the point (p.x*i, p.y*i).

p.div(i)

Returns the point (p.x/i, p.y/i).

p.eq(q)

Returns non-zero if the points' coordinates are equal and zero otherwise.

p.in(r)

Returns non-zero if point p lies within rectangle r and zero otherwise.

SEE ALSO

draw-intro (2), draw-rect (2)