From 78e51a8c6678b6e3dff3d619aa786669f531f4bc Mon Sep 17 00:00:00 2001 From: rsc Date: Fri, 14 Jan 2005 03:45:44 +0000 Subject: checkpoint --- man/man3/addpt.html | 174 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 174 insertions(+) create mode 100644 man/man3/addpt.html (limited to 'man/man3/addpt.html') diff --git a/man/man3/addpt.html b/man/man3/addpt.html new file mode 100644 index 00000000..1c327aaa --- /dev/null +++ b/man/man3/addpt.html @@ -0,0 +1,174 @@ + +addpt(3) - Plan 9 from User Space + + + + +
+
+
ADDPT(3)ADDPT(3) +
+
+

NAME
+ +
+ + addpt, subpt, mulpt, divpt, rectaddpt, rectsubpt, insetrect, canonrect, + eqpt, eqrect, ptinrect, rectinrect, rectXrect, rectclip, combinerect, + Dx, Dy, Pt, Rect, Rpt – arithmetic on points and rectangles
+ +
+

SYNOPSIS
+ +
+ + #include <u.h>
+ #include <libc.h>
+ #include <draw.h> +
+ + Point       addpt(Point p, Point q) +
+ + Point       subpt(Point p, Point q) +
+ + Point       mulpt(Point p, int a) +
+ + Point       divpt(Point p, int a) +
+ + Rectangle rectaddpt(Rectangle r, Point p) +
+ + Rectangle rectsubpt(Rectangle r, Point p) +
+ + Rectangle insetrect(Rectangle r, int n) +
+ + Rectangle canonrect(Rectangle r) +
+ + int         eqpt(Point p, Point q) +
+ + int         eqrect(Rectangle r, Rectangle s) +
+ + int         ptinrect(Point p, Rectangle r) +
+ + int         rectinrect(Rectangle r, Rectangle s) +
+ + int         rectXrect(Rectangle r, Rectangle s) +
+ + int         rectclip(Rectangle *rp, Rectangle b) +
+ + void        combinerect(Rectangle *rp, Rectangle b) +
+ + int         Dx(Rectangle r) +
+ + int         Dy(Rectangle r) +
+ + Point       Pt(int x, int y) +
+ + Rectangle Rect(int x0, int y0, int x1, int y1) +
+ + Rectangle Rpt(Point p, Point q)
+ +
+

DESCRIPTION
+ +
+ + The functions Pt, Rect and Rpt construct geometrical data types + from their components. +
+ + Addpt returns the Point sum of its arguments: Pt(p.x+q.x, p.y+q.y). + Subpt returns the Point difference of its arguments: Pt(p.x−q.x, + p.y−q.y). Mulpt returns the Point Pt(p.x*a, p.y*a). Divpt returns + the Point Pt(p.x/a, p.y/a). +
+ + Rectaddpt returns the Rectangle Rect(add(r.min, p), add(r.max, + p)); rectsubpt returns the Rectangle Rpt(sub(r.min, p), sub(r.max, + p)). +
+ + Insetrect returns the Rectangle Rect(r.min.x+n, r.min.y+n, r.max.x−n, + r.max.y−n). +
+ + Canonrect returns a rectangle with the same extent as r, canonicalized + so that min.x ≤ max.x, and min.y ≤ max.y. +
+ + Eqpt compares its argument Points and returns 0 if unequal, 1 + if equal. Eqrect does the same for its argument Rectangles. +
+ + Ptinrect returns 1 if p is a point within r, and 0 otherwise. + +
+ + Rectinrect returns 1 if all the pixels in r are also in s, and + 0 otherwise. +
+ + RectXrect returns 1 if r and s share any point, and 0 otherwise. + +
+ + Rectclip clips in place the Rectangle pointed to by rp so that + it is completely contained within b. The return value is 1 if + any part of *rp is within b. Otherwise, the return value is 0 + and *rp is unchanged. +
+ + Combinerect overwrites *rp with the smallest rectangle sufficient + to cover all the pixels of *rp and b. +
+ + The functions Dx and Dy give the width (Δx) and height (Δy) of + a Rectangle. They are implemented as macros.
+ +
+

SOURCE
+ +
+ + /usr/local/plan9/src/libdraw
+ +
+

SEE ALSO
+ +
+ + graphics(3)
+ +
+ +

 +
+
+ + +
+
+
+Space Glenda +
+
+ + -- cgit v1.2.3