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-.TH ADD 9.3
-.CT 2 math
-.SH NAME
-add, sub, mul, div, eqpt, eqrect, inset, muldiv, ptinrect, raddp, rsubp, rectXrect, rectclip \- arithmetic on points and rectangles
-.SH SYNOPSIS
-.B #include <jerq.h>
-.PP
-.B Point add(p, q)
-.B Point p, q;
-.PP
-.B Point sub(p, q)
-.B  Point p, q;
-.PP
-.B Point mul(p, a)
-.B  Point p; int a;
-.PP
-.B Point div(p, a)
-.B  Point p; int a;
-.PP
-.B int eqpt(p, q)
-.B  Point p, q;
-.PP
-.B int eqrect(r, s)
-.B  Rectangle r, s;
-.PP
-.B Rectangle inset(r, n)
-.B  Rectangle r; int n;
-.PP
-.B int muldiv(a, b, c)
-.B  int a, b, c;
-.PP
-.B int ptinrect(p, r)
-.B  Point p; Rectangle r;
-.PP
-.B Rectangle raddp(r, p)
-.B  Rectangle r; Point p;
-.PP
-.B Rectangle rsubp(r, p)
-.B  Rectangle r; Point p;
-.PP
-.B int rectXrect(r, s)
-.B  Rectangle r, s;
-.PP
-.B int rectclip(rp, s)
-.B Rectangle *rp, s;
-.SH DESCRIPTION
-.I Add
-returns the Point
-sum of its arguments:
-.BI Pt( p .x+ q .x,
-.IB p .y+ q .y).
-.I Sub
-returns the Point
-difference of its arguments:
-.BI Pt( p .x- q .x,
-.IB p .y- q .y).
-.I Mul
-returns the Point
-.BI Pt( p .x* a ,
-.IB p .y* a ).
-.I Div
-returns the Point
-.BI Pt( p .x/ a ,
-.IB p .y/ a ).
-.PP
-.I Eqpt
-and
-.I eqrect
-compare their arguments and return
-0 if unequal,
-1 if equal.
-.PP
-.I Inset
-returns the Rectangle
-.BI Rect( r .origin.x+ n ,
-.IB r .origin.y+ n ,
-.IB r .corner.x- n ,
-.IB r .corner.y- n ) .
-The following code creates a clear rectangle
-.B r
-with a 2-pixel wide border inside
-.BR r :
-.IP
-.EX
-rectf(&display, r, F_OR);
-rectf(&display, inset(r, 2), F_CLR);
-.EE
-.PP
-.I Muldiv
-is a macro that returns the 16-bit result
-.BI ( a * b )/  c\fR,
-with
-.BI ( a * b  )
-calculated to 32 bits, so
-no precision is lost.
-.PP
-.I Ptinrect
-returns 1 if
-.I p
-is a point within
-.IR r ,
-and 0 otherwise.
-.PP
-.I Raddp
-returns the Rectangle
-.BI Rect(add( r .origin,
-.IB p ),
-.BI add( r .corner,
-.IB p ))\fR;
-.I rsubp
-returns the Rectangle
-.BI Rect(sub( r .origin,
-.IB p ),
-.BI sub( r .corner,
-.IB p ))\fR.
-.PP
-.I RectXrect
-returns 1 if
-.I r
-and
-.I s
-share any point; 0 otherwise.
-.PP
-.I Rectclip
-clips in place
-the Rectangle pointed to by
-.I rp
-so that it is completely contained within
-.IR s .
-The return value is 1 if any part of
-.RI * rp
-is within
-.IR s .
-Otherwise, the return value is 0 and
-.RI * rp
-is unchanged.
-.SH SEE ALSO
-.IR types (9.5)