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add(2) [plan9 man page]

ADD(2)								System Calls Manual							    ADD(2)

add, sub, mul, div, raddp, rsubp, rmul, rdiv, rshift, inset, rcanon, eqpt, eqrect, ptinrect, rectinrect, rectXrect, rectclip, Dx, Dy, Pt, Rect, Rpt - arithmetic on points and rectangles SYNOPSIS
#include <u.h> #include <libc.h> #include <libg.h> Point add(Point p, Point q) Point sub(Point p, Point q) Point mul(Point p, int a) Point div(Point p, int a) Rectangle raddp(Rectangle r, Point p) Rectangle rsubp(Rectangle r, Point p) Rectangle rmul(Rectangle r, int a) Rectangle rdiv(Rectangle r, int a) Rectangle rshift(Rectangle r, int a) Rectangle inset(Rectangle r, int n) Rectangle rcanon(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) 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. These are implemented as macros. Add returns the Point sum of its arguments: Pt(p.x+q.x, p.y+q.y). Sub returns the Point difference of its arguments: Pt(p.x-q.x, p.y-q.y). Mul returns the Point Pt(p.x*a, p.y*a). Div returns the Point Pt(p.x/a, p.y/a). Raddp returns the Rectangle Rect(add(r.min, p), add(r.max, p)); rsubp returns the Rectangle Rpt(sub(r.min, p), sub(r.max, p)). Rmul returns the Rectangle Rpt(mul(r.min,a), mul(r.max,a)); Rdiv returns the Rectangle Rpt(div(r.min,a), div(r.max,a)). Rshift returns the rectangle r with all coordinates either left-shifted or right-shifted by a, depending on whether a is positive or nega- tive, respectively. Inset returns the Rectangle Rect(r.min.x+n, r.min.y+n, r.max.x-n, r.max.y-n). Rcanon 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. The functions Dx and Dy give the width (x) and height (y) of a Rectangle. They are implemented as macros. SOURCE
/sys/src/libg SEE ALSO
graphics(2) ADD(2)

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allocrdsrec - allocates memory for a rectangle ORIGIN
This software belongs to the ALLIANCE CAD SYSTEM developed by the ASIM team at LIP6 laboratory of Universite Pierre et Marie CURIE, in Paris, France. Web : E-mail : SYNOPSYS
#include"rdsnnn.h" rdsrec_list *allocrdsrec( Size ) unsigned int Size; PARAMETER
Size Size of the added structure to the rdsrec_list structure. DESCRIPTION
Allocates a memory block for rdsrec_list structure and an added structure defined by the user. Fields contained in the two structures are set to NULL for pointers and 0L for numbers. NOTE: Allocation by heap ( see rdsalloc function ). RETURN VALUE
The pointer to the rectangle structure allocated. ERRORS
"Rds202: rdsalloc error, can't continue !" it's impossible to allocate the memory size desired. EXAMPLE
# include "mutnnn.h" # include "rdsnnn.h" # include "rtlnnn.h" /* Name and fields of UserStruct are defined by the user */ typedef struct UserStruct { char *STRING; void *USER1; } UserStruct; # define POINTER_STRING(R) (((UserStruct *)((char *)(R)+sizeof(rdsrec_list)))->STRING ) # define POINTER_USER1(R) (((UserStruct *)((char *)(R)+sizeof(rdsrec_list)))->USER1 ) main() { rdsfig_list *Figure; rdsrec_list *Rectangle; mbkenv(); rdsenv(); loadrdsparam(); Rectangle = allocrdsrec ( sizeof ( UserStruct ) ); Rectangle->X = 20; Rectangle->Y = 20; Rectangle->DX = 48; Rectangle->DY = 8; POINTER_STRING (Rectangle) = (char *) malloc (strlen ("Alu1")+1); strcpy(POINTER_STRING(Rectangle),"Alu1"); POINTER_USER1 (Rectangle) = (void *) Figure; ... } SEE ALSO
librds, freerdsrec, rdsalloc, rdsfree BUG REPORT
This tool is under development at the ASIM department of the LIP6 laboratory. We need your feedback to improve documentation and tools. ASIM
/LIP6 October 1, 1997 ALLOCRDSREC(3)
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