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svg animated arrow pointer and tooltip

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# Yarrow
[![Build Status](https://travis-ci.org/krispo/yarrow.svg?branch=master)](https://travis-ci.org/krispo/yarrow)
[![NPM Version](http://img.shields.io/npm/v/yarrow.svg?style=flat)](https://www.npmjs.org/package/yarrow)

SVG animated arrow pointer and tooltip.

Demos:

1. [Web page](http://krispo.github.io/yarrow/).
2. [Plnkr](http://plnkr.co/edit/jUGsAw?p=preview).

## Install

npm install yarrow

and include it in html `head` section:

```js
// for es6
import {Yarrow} from 'yarrow';
var yarrow = new Yarrow();

// or in older versions use require:
// var Yarrow = require('yarrow');
// var yarrow = new Yarrow.Yarrow();

// add new arrow
var arrow = yarrow.arrow({
  x1: 0,                // source x coordinate
  y1: 0,                // source y coordinate
  x2: 100,              // target x coordinate
  y2: 100,              // target y coordinate
  text: "I'm arrow!"    // arrow label    
});

// render arrow on the page
arrow.render();

// dispose arrow with duration=1000 after delay=500
arrow.dispose(1000, 500);
```

the same with chaining notation:

```js
yarrow.arrow({...}).render().dispose(1000, 500);
```

## API Reference

### Yarrow
Yarrow is a container of `arrows`.

<a name="yarrow_arrow" href="#yarrow_arrow">#</a> yarrow.arrow(opts)

Create new arrow with specified options. Returns created arrow.

<a name="yarrow_arrows" href="#yarrow_arrows">#</a> yarrow.arrows([opts])

Create multiple arrows with specified options at a time. If *opts* are not specified, returns the current array of *arrow*.

<a name="yarrow_renderAll" href="#yarrow_renderAll">#</a> yarrow.renderAll()

Render all arrows at a time.

<a name="yarrow_disposeAll" href="#yarrow_disposeAll">#</a> yarrow.disposeAll(duration, delay)

Dispose all arrows with specified *duration*, and after specified *delay* time. Arrows are removed completely.

### Arrow
Single arrow instance. Available options are listed below.

<a name="arrow_render" href="#arrow_render">#</a> arrow.render()

Render the current arrow.

<a name="arrow_dispose" href="#arrow_dispose">#</a> arrow.dispose(duration, delay)

Dispose the current arrow with specified *duration*, and after specified *delay* time. The arrow is removed completely.

#### Options behaviour

Options can be initialized using the following methods:
 
1. *yarrow*.arrow(*opts*)
2. *yarrow*.arrows(*[opts]*)
3. *arrow*.options(*opts*)

Under initialization, a set of options

x1, y1, x2, y2, d, d1, d2, textReverseDirection, textStartOffset 
    
can be define as `function`

```js
function(opts, utils) {
  // opts   - the current options, after initialization
  // utils  - svg-path-utils
  return 'some_value'; 
}
```

that takes 2 parameters: the current options *opts*, and [svg-path-utils](https://github.com/krispo/svg-path-utils) utilities. 
It can help us to manipulate dynamic `arrow` behaviour. For example, it is useful when we don't know the coordinates of the source or target elements.

Let's show how it works. Define options

```js
var opts = {

source: '#source_id', // define source element via id

target: document.getElementById('target_id'), // or define target element via document element

x1: function(_, u) {
    // _ - this options object has already had explicit values for `source` and `target`
    return _.source.left + _.source.width / 2;
  },

y1: function(_, u) {     
    return _.source.top + _.source.height / 2;
  },

x2: function(_, u) {   
    return _.target.left + _.target.width / 2;
  },

y2: function(_, u) {     
    return _.target.top + _.target.height / 2;
  },

d: function(_, u) {
    // _ - this options object has already had explicit values for x1, y1, x2, y2;
    // _.w and _.h are calculated based on x1, y1, x2, y2
    return u.join(u.M(0, 0), u.Q(_.w, 0, _.w, _.h));
  }
};

yarrow.arrow(opts).render();
```
The resulting arrow will start from the middle of the `source` element, and then will go to the middle of the `target` element, 
and will draw a quadratic Bézier curve.

#### Arrow options

All options have `get/set` behaviour, except the options with `READONLY` property. 
 
<a name="_options" href="#_options">#</a> .options(opts)

Specifies the arrow options. If *opts* is not defined, returns the current options.

<a name="_x1" href="#_x1">#</a> .x1()

Source x coordinate

<a name="_y1" href="#_y1">#</a> .y1()

Source y coordinate

<a name="_x2" href="#_x2">#</a> .x2()

Target x coordinate

<a name="_y2" href="#_y2">#</a> .y2()

Target y coordinate

<a name="_dx" href="#_dx">#</a> .dx()

`READONLY` property, equals (x2 - x1)

<a name="_dy" href="#_dy">#</a> .dy()

`READONLY` property, equals (y2 - y1)

<a name="_w" href="#_w">#</a> .w()

`READONLY` property, equals |x2 - x1|

<a name="_h" href="#_h">#</a> .h()

`READONLY` property, equals |y2 - y1|

<a name="_source" href="#_source">#</a> .source()

Selector or node element for source point. Eg, `source: '#source_id'`. After initialization it's converted into object with props: `element`, `top`, `left`, `width`, `height`.

```js
arrow.options({
  ...,
  source: "#source_id",
  ...
});

arrow.options(); 
/* returns:
{
 ...,
 source: {
 element: < html element >,
 top: 10,
 left: 20,
 width: 100,
 height: 200
 }, 
 ...
}
*/
```

<a name="_target" href="#_target">#</a> .target()

Selector or node element for target point. Eg, `target: '#target_id'`. After initialization it's converted into object with props: `element`, `top`, `left`, `width`, `height`.

```js
arrow.options({
  ...,
  target: "#target_id",
  ...
});

arrow.options(); 
/* returns:
{
 ...,
 target: {
 element: < html element >,
 top: 10,
 left: 20,
 width: 100,
 height: 200
 }, 
 ...
}
*/
```
 
<a name="_duration" href="#_duration">#</a> .duration()

Render duration for the arrow curve

<a name="_delay" href="#_delay">#</a> .delay()

Delay before start rendering for the arrow curve

<a name="_d" href="#_d">#</a> .d()

Path for the arrow curve (by default it's a simple line) 
 
<a name="_duration1" href="#_duration1">#</a> .duration1()

Render duration for the first tip

<a name="_delay1" href="#_delay1">#</a> .delay1()

Delay before start rendering for the first tip

<a name="_d1" href="#_d1">#</a> .d1()

Path for the first tip (by default it's a simple line) 
 
<a name="_duration2" href="#_duration2">#</a> .duration2()

Render duration for the second tip

<a name="_delay2" href="#_delay2">#</a> .delay2()

Delay before start rendering for the second tip

<a name="_d2" href="#_d2">#</a> .d2()

Path for the second tip (by default it's a simple line) 
 
<a name="_arrowStyles" href="#_arrowStyles">#</a> .arrowStyles()

Specify styles for arrow

<a name="_textStyles" href="#_textStyles">#</a> .textStyles()

Specify styles for text
 
<a name="_text" href="#_text">#</a> .text()

Label text for arrow

<a name="_textReverseDirection" href="#_textReverseDirection">#</a> .textReverseDirection()

Direct arrow text in a `end -> start` way (default direction is `start -> end`)

<a name="_textStartOffset" href="#_textStartOffset">#</a> .textStartOffset()

Text offset from the `start` of the path (or from the `end` of the path if used `textReverseDirection`)

<a name="_textDx" href="#_textDx">#</a> .textDx()

Horizontal text offset

<a name="_textDy" href="#_textDy">#</a> .textDy()

Vertical text offset

<a name="_margin" href="#_margin">#</a> .margin()

An outer margin for drawing rectangle. Eg, suppose `(x1,y1)=(100,100)`, `(x2,y2)=(200,200)`. 
If `margin = { top: 0, right: 0, bottom: 0, left: 0 }`, the drawing rectangle will be `(100,100),(200,200)`. 
If `margin = { top: 50, right: 20, bottom: 10, left: 30 }`, the drawing rectangle will be `(70,50),(220,210)`.

## Licence
MIT

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