A *position* is a point on the SVG canvas. A *place* is
a specific position associated with an object. Every *place* is a *position*,
but not every *position* is a *place*. This page is about *position*.

*expr***,***expr**place**place***+***expr***,***expr**place***-***expr***,***expr**place***+ (***expr***,***expr***)***place***- (***expr***,***expr***)****(***position***,***position***)****(***position***)***fraction***of the way between***position***and***position**fraction***way between***position***and***position**fraction***between***position***and***position**fraction***<***position***,***position***>***distance**which-way-from**position*

## Absolute versus Place-relative Positions

One form of a position is an (X,Y) coordinate pair. This works, but
its use is discouraged. It is better to use positions that are
either a *place* or are derived from one or more places.

## The "**(** *position* **,** *position* **)**" Form

A place of the form "(pos1,pos2)" where pos1 and pos2 are other positions means use the X coordinate from pos1 and the Y coordinate from pos2.

leftmargin = 1cm; P1: dot; text "P1" with .s at 2mm above P1 P2: dot at P1+(2cm,-2cm); text "P2" with .s at 2mm above P2 dot at (P1,P2); text "(P1,P2)" with .s at 2mm above last dot dot at (P2,P1); text "(P2,P1)" with .s at 2mm above last dot→ /pikchrshow

## "*fraction* **of the way between**" Forms

All of these syntactic forms of position are the same:

*fraction***of the way between***position***and***position**fraction***way between***position***and***position**fraction***between***position***and***position**fraction***<***position***,***position***>**

The last form is the most cryptic, but it is also the most compact and hence ends up being the most often used.

In all cases *fraction* is an expression that usually evaluates to between 0.0
and 1.0. The resulting position is that fraction along a line that
connects the first *position* to the second *position*.

The *fraction* can be less than 0.0 or greater than 1.0, in which case
the point is on the extended line that connects the two positions.

P1: dot; text "P1" with .s at 2mm above P1 P2: dot at P1+(4cm,1.5cm); text "P2" with .s at 2mm above P2 line thin color gray dotted from -.5<P1,P2> to 1.5<P1,P2> dot at 3/4<P1,P2>; text "3/4<P1,P2>" at (last dot,P1) arrow thin color gray from last text.n to 1mm south of last dot dot at -0.25 of the way between P1 and P2 text "-0.25 of the way between P1 and P2" at (last dot,P2) arrow thin color gray from last text.s to 1mm north of last dot→ /pikchrshow

## "*position* *which-way-from* *position*" Forms

It is very common to specify a position as an offset from some other position using this format. Some examples:

- 1cm below Obstacle.s
- 0.5*linewid left of C0.w
- dist(C2,C3) heading 30 from C2