c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe<div class="intro">

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe <p>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe <img src="{{componentAssets}}/img/graphics.png" alt="Screenshot of the Graphics" style="border: 1px solid #bfbfbf; float:right; height:150px; margin: 0 0 8px 8px; width:275px;">

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe The Graphics module provides a JavaScript API for creating shapes in a variety of formats across all A-grade browsers. Based on device and browser capabilities, Graphics leverages SVG, HTML Canvas and VML to render its graphical elements.

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe </p>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe <p>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe The Graphics module features a `Graphic` class that allows you to easily create and manage shapes. Currently, a `Graphic` instance can be used to create predifined shapes and free-form polygons with fill and stroke properties.

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe </p>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe</div>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe{{>getting-started}}

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe<h2 id="using">Using the Graphics module</h2>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe<p>The `Graphic` class acts a factory and container for shapes. You need at least one `Graphic` instance to create shapes for your application.</p>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe<h3 id="instantiating">Instantiating A Graphic instance</h3>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe<p>All you need to instantiate a Graphic instance is an HTML element in which to render. Alternatively, you can attach your instance to the body of your page.</p>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe<h4>CSS</h4>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe```

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe#mygraphiccontainer {

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe width: 600px;

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe height: 400px;

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe}

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe```

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe<h4>HTML</h4>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe```

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe<div id="mygraphiccontainer"></div>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe```

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe<h4>JavaScript</h4>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe```

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe// Instantiate a graphic instance

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowevar mygraphic = new Y.Graphic({

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe render: "#mygraphiccontainer"

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe});

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe```

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe <p>By default, `Graphic` will size to its parent container. The API also provides the option of explicitly setting its `width` and `height` attributes. Additionally, the Graphic class provides an `autoSize` attribute. When set to true, the Graphic instance will expand to fit its contents.

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe<h3>Creating shapes</h3>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe<p>Shapes are created using the `addShape` method. The `addShape` method takes a config parameter that defines the shape and its properties. When creating a shape, the shape is determined by the `type`

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Loweattribute. The `Graphics` module includes four pre-defined shapes. They can be created by passing a `String` reference.</p>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe<table>

c10c16dec587a0662068f6e2991c29ed3a9db943Richard Lowe <tr>

<th>key</th>

<th>shape</th>

</tr>

<tr>

<td>circle</td>

<td>Y.Circle</td>

</tr>

<tr>

<td>ellipse</td>

<td>Y.Ellipse</td>

</tr>

<tr>.

<td>rect</td>

<td>Y.Rect</td>

</tr>

<tr>

<td>path</td>

<td>Y.Path</td>

</tr>

</table>

<p>Alternatively, you can create your own custom class and pass it directly through the `type` attribute.</p>

<p>The below code would create a 300x200 rectangle with a blue fill and a red border.</p>

```

var mygraphic = new Y.Graphic({render:"#mygraphiccontainer"}),

myrect = mygraphic.addShape({

type: "rect",

width: 300,

height: 200,

fill: {

color: "#0000ff"

},

stroke: {

weight: 2,

color: "#ff0000"

},

x: 50,

y: 100

});

```

<p>This code would create an instance of a custom shape that you have created.</p>

```

var mygraphic = new Y.Graphic({render:"#mygraphiccontainer"}),

myrect = mygraphic.addShape({

type: Y.MyCustomShape,

width: 300,

height: 200,

fill: {

color: "#0000ff"

},

stroke: {

weight: 2,

color: "#ff0000"

},

x: 50,

y: 100

});

```

<h3 id="aboutgraphic">Working with the Graphic Class</h3>

<p>The `Graphics` module uses different technologies based on browser capabilities. The `Graphics` module normalizes these different technologies with a consistent API. Ideally, you should not

have to interact directly with the underlying technologies or their corresponding HTML elements. Both the `Graphic` and `Shape` classes provide APIs for sizing, positioning and customization.</p>

<h4 id="graphicattributes">Graphic Attributes</h4>

<p>The `Graphic` class exposes the following attributes.</p>

<table>

<tr>

<th>Attribute</th>

<th>Type</th>

<th>Description</th>

</tr>

<tr>

<td>`id`</td>

<td>`String`</td>

<td>Unique identifier for the `Graphic` instance. If not explicity set, one will be generated.</td></tr>

<tr>

<td>`shapes`</td>

<td>`Object`</td>

<td>Key value pairs containing all shape instances contained in the `Graphic` instance.</td>

</tr>

<tr>

<td>`contentBounds`</td>

<td>`Object`</td>

<td>Object containing size and coordinate data for the content of a Graphic in relation to the coordinate space of the `Graphic` instance. The following values are included: `top`, `right`, `bottom`, `left`, `width` and `height`.</td>

</tr>

<tr>

<td>`node`</td>

<td>`HTMLElement`</td>

<td>Outermost HTMLElement of the `Graphic` instance. (read-only)</td>

</tr>

<tr>

<td>`width`</td>

<td>`Number`</td>

<td>The width of the `Graphic` instance.</td>

</tr>

<tr>

<td>`height`</td>

<td>`Number`</td>

<td>The height of the `Graphic` instance.</td>

</tr>

<tr>

<td>`autoSize`</td>

<td>`boolean`</td>

<td>Determines how the size of instance is calculated. If true, the width and height are determined by the size of the contents. If false, the width and height values are either explicitly set or determined by the size of the parent node's dimensions. The default value is false.</td>

</tr>

<tr>

<td>`resizeDown`</td>

<td>`boolean`</td>

<td>The `contentBounds` will resize to greater values but not to smaller values. (for performance) When resizing the `contentBounds` down is desirable, set the resizeDown value to true. The default value is false.</td>

</tr>

<tr>

<td>`x`</td>

<td>`Number`</td>

<td>Indicates the x-coordinate for the instance.</td>

</tr>

<tr>

<td>`y`</td>

<td>`Number`</td>

<td>Indicates the y-coordinate for the instance.</td>

</tr>

<tr>

<td>`autoDraw`</td>

<td>`boolean`</td>

<td>Indicates whether or not the instance will automatically redraw after a change is made to a shape. When performing multiple operations, such adding many shapes, `autoDraw` can be set to false. Calling `_redraw` will force a redraw when `autoDraw` is `false`.</td>

</tr>

<tr>

<td>`visible`</td>

<td>`boolean`</td>

<td>Toggles visibility for a `Graphic` instance.</td>

</tr>

</table>

<h4 id="graphicmethods">Graphic Methods</h4>

<p>The `Graphic` class also has the following public methods.</p>

<table>

<tr>

<th>`Method`</th>

<th>Description</th>

</tr>

<tr>

<td>getXY</td>

<td>Returns an array containing the current position of the graphic instance in page coordinates.</td>

</tr>

<tr>

<td>addShape</td>

<td>Generates and returns a shape instance by type.</td>

</tr>

<tr>

<td>removeShape</td>

<td>Removes a shape instance from from the graphic instance.</td>

</tr>

<tr>

<td>removeAllShapes</td>

<td>Removes all shape instances</td>

</tr>

<tr>

<td>destroy</td>

<td>Destroys the graphic instance and all its children.</td>

</tr>

<tr>

<td>getShapeById</td>

<td>Returns a shape instance based on an id.</td>

</tr>

<tr>

<td>batch</td>

<td>Allows for creating multiple shapes in order to batch appending and redraw operations.</td>

</tr>

</table>

<h3 id="aboutshapes">Working with Shapes</h3>

<h4 id="shapeattributes">Shape Attributes</h4>

<p>Each shape shares a common set of attributes. Attributes shared across all shapes are listed below:</p>

<table>

<tr>

<th>Attribute</th>

<th>Type</th>

<th>Description</th>

</tr>

<tr>

<td>`id`</td>

<td>`String`</td>

<td>Unique identifier for the `Shape` instance. If not explicity set, one will be generated.</td></tr>

</tr>

<tr>

<td>`node`</td>

<td>`HTMLElement`</td>

<td>HTMLElement of the `Shape` instance. (read-only)</td>

</tr>

<tr>

<td>`x`</td>

<td>`Number`</td>

<td>The x-coordinate of the shape.</td>

</tr>

<tr>

<td>`y`</td>

<td>`Number`</td>

<td>The y-coordinate of the shape.</td>

</tr>

<tr>

<td>`width`</td>

<td>`Number`</td>

<td>The width of the `Shape` instance.</td>

</tr>

<tr>

<td>`height`</td>

<td>`Number`</td>

<td>The height of the `Shape` instance.</td>

</tr>

<tr>

<td>`visible`</td>

<td>`boolean`</td>

<td>Toggles visibility for a `Shape` instance.</td>

</tr>

<tr>

<td>`fill`</td>

<td>`Object`</td>

<td>

Contains information about the fill of the shape.

</td>

</tr>

<tr>

<td>stroke</td>

<td>`Object`</td>

<td>

Contains information about the stroke of the shape.

</td>

</tr>

<tr>

<td>`transformOrigin`</td>

<td>`Array`</td>

<td>The x and y values for the transformOrigin of a transform.</td>

</tr>

<tr>

<td>`transform`</td>

<td>`String`</td>

<td>A string containing, in order, transform operations applied to the shape instance. The `transform` string can contain the following values:

<dl>

<dt>rotate</dt><dd>Rotates the shape clockwise around it transformOrigin.</dd>

<dt>translate</dt><dd>Specifies a 2d translation.</dd>

<dt>skew</dt><dd>Skews the shape around the x-axis and y-axis.</dd>

<dt>scale</dt><dd>Specifies a 2d scaling operation.</dd>

<dt>translateX</dt><dd>Translates the shape along the x-axis.</dd>

<dt>translateY</dt><dd>Translates the shape along the y-axis.</dd>

<dt>skewX</dt><dd>Skews the shape around the x-axis.</dd>

<dt>skewY</dt><dd>Skews the shape around the y-axis.</dd>

</dl>

Applying transforms through the transform attribute will reset the transform matrix and apply a new transform. The shape class also contains corresponding methods for each transform

that will apply the transform to the current matrix. The below code illustrates how you might use the `transform` attribute to instantiate a recangle with a rotation of 45 degrees.

```

var myRect = new Y.Rect({

type:"rect",

width: 50,

height: 40,

transform: "rotate(45)"

};

```

The code below would apply `translate` and `rotate` to an existing shape.</p>

```

myRect.set("transform", "translate(40, 50) rotate(45)");

```

</td>

</tr>

</table>

<h4 id="shapemethods">Shape Methods</h4>

<p>Shapes can also be manipulated by the following methods:</p>

<table>

<tr>

<th>Method</th>

<th>Description</th>

</tr>

<tr>

<td>`addClass`</td>

<td>Adds a class to the underlying HTMLElement.</td>

</tr>

<tr>

<td>`removeClass`</td>

<td>Removes a class to the underlying HTMLElement.</td>

</tr>

<tr>

<td>`getXY`</td>

<td>Gets the current position of the shape in page coordinates. Returns an array, `[x, y,]`, with the coordinates.</td>

</tr>

<tr>

<td>`setXY`</td>

<td>Sets the current position of the shape in page coordinates. Accepts an array, `[x, y]`, with the coordinates.</td>

</tr>

<tr>

<td>`get`</td>

<td>Returns the value of a given attribute.</td>

</tr>

<tr>

<td>`set`</td>

<td>Sets the value of an attribute.</td>

</tr>

<tr>

<td>`rotate`</td>

<td>Rotates the shape clockwise around it `transformOrigin`.</td>

</tr>

<tr>

<td>`translate`</td>

<td>Specifies a 2d translation.</td>

</tr>

<tr>

<td>`translateX`</td>

<td>Translates the shape along the x-axis.</td>

</tr>

<tr>

<td>`translateY`</td>

<td>Translates the shape along the y-axis.</td>

</tr>

<tr>

<td>`skew`</td>

<td>Skews the shape around the x-axis and y-axis.</td>

</tr>

<tr>

<td>`skewX`</td>

<td>Skews the shape around the x-axis.</td>

</tr>

<tr>

<td>`skewY`</td>

<td>Skews the shape around the y-axis.</td>

</tr>

<tr>

<td>`scale`</td>

<td>Specifies a 2d scaling operation.</td>

</tr>

</table>

<h4 id="drawingmethods">Drawing Methods</h4>

<p>Unlike the other included shapes, the `Path` class is not pre-defined. Setting the size, fill and/or stroke of a pre-defined shape will render the shape. This is not true with the `Path`. To render

a `Path` instance, its drawing methods need to be leveraged. These drawing methods can also be leveraged when creating custom shapes. Available drawing methods include:

<dl>

<dt>moveTo</dt><dd>Moves to a coordinate point without drawing a line.</dd>

<dt>lineTo</dt><dd>Draws a line segment from the current point to the specified point.</dd>

<dt>curveTo</dt><dd>Draws a curve based on a start point, end point and two control points.</dd>

<dt>quadraticCurveTo</dt><dd>Draws a quadratic curve based on a start point, end point and two control points.</dd>

<dt>end</dt><dd>Ends a drawing operation. The path or custom shape will draw after end is called.</dd>

<dt>clear</dt><dd>Clears all contents of a path or custom shape.</dd>

</dl>

</p>

<h4 id="strokesandfills">Strokes and Fills</h4>

<p>All `Shape` instances contain `stroke` and `fill` attributes. They are used to define the colors for a `Shape`.</p>

<h5 id="definingstrokes">Defining a Stroke</h5>

<p>The `stroke` attribute has four properties.</p>

<dl>

<dt>color</dt><dd>The color of the stroke.</dd>

<dt>weight</dt><dd>Number that indicates the width of the stroke.</dd>

<dt>opacity</dt><dd>Number between 0 and 1 that indicates the opacity of the stroke. The default value is 1.</dd>

<dt>dashstyle</dt>Indicates whether to draw a dashed stroke. When set to "none", a solid stroke is drawn. When set to an array, the first index indicates the

length of the dash. The second index indicates the length of gap.

</dl>

<p>The code below would set a 2 pixel solid red stroke on `myshape`.</p>

```

myshape.set("stroke", {

color: "#ff0000",

weight: 2

});

```

<p>The `dashstyle` property can be used to create a dashed stroke on a shape.</p>

```

myshape.set("stroke", {

color: "#ff0000",

weight: 2,

dashstyle: [3, 2]

});

```

<h5 id="definingfills">Defining a Fill</h5>

<p>The `fill` attribute has the following properties.</p>

<dl>

<dt>color</dt><dd>The color of the fill.</dd>

<dt>opacity</dt><dd>Number between 0 and 1 that indicates the opacity of the fill. The default value is 1.</dd>

<dt>type</dt><dd>Type of fill.

<dl>

<dt>solid</dt><dd>Solid single color fill. (default)</dd>

<dt>linear</dt><dd>Linear gradient fill.</dd>

<dt>radial</dt><dd>Radial gradient fill.</dd>

</dl>

</dd>

</dl>

<p>If a `linear` or `radial` is specified as the fill type. The following additional property is used:

<dl>

<dt>stops</dt><dd>An array of objects containing the following properties:

<dl>

<dt>color</dt><dd>The color of the stop.</dd>

<dt>opacity</dt><dd>Number between 0 and 1 that indicates the opacity of the stop. The default value is 1. Note: No effect for IE <= 8</dd>

<dt>offset</dt><dd>Number between 0 and 1 indicating where the color stop is positioned.</dd>

</dl>

</dd>

<p>Linear gradients also have the following property:</p>

<dt>rotation</dt><dd>Linear gradients flow left to right by default. The rotation property allows you to change the flow by rotation. (e.g. A rotation of 180 would make the gradient pain from right to left.)</dd>

<p>Radial gradients have the following additional properties:</p>

<dt>cx</dt><dd>The x-coordinate of the center of the gradient circle.</dd>

<dt>cy</dt><dd>The y-coordinate of the center of the gradient circle.</dd>

<dt>r</dt><dd>Radius of the gradient circle.</dd>

<dt>fx</dt><dd>Focal point x-coordinate of the gradient.</dd>

<dt>fy</dt><dd>Focal point y-coordinate of the gradient.</dd>

</dl>

<h2 id="issues">Known Issues</h2>

<ul class="spaced">

<li>

<p>Gradients need more need more normalization accross technologies.</p>

</li>

<li>

<p>Transforms can display inconsistencies between IE < 8 and other browsers.</p>

</li>

<li>

<p>Path element currently lacks the ability to have interactivity in Android.</p>

</li>

</ul>