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HTML5 SVG (Scalable Vector Graphics )

Outlines

SVG stands for Scalable Vector Graphics SVG is used to define vector-based graphics for

the Web SVG defines the graphics in XML format SVG graphics do NOT lose any quality if they

are zoomed or resized Every element and every attribute in SVG files

can be animated SVG is a W3C recommendation

What is SVG?

Advantages of using SVG over other image formats (like JPEG and GIF) are: SVG images can be created and edited with any text editor SVG images can be searched, indexed, scripted, and

compressed SVG images are scalable SVG images can be printed with high quality at any

resolution SVG images are zoom able (and the image can be zoomed

without degradation)

SVG Advantages

In HTML5, you can embed SVG elements directly into your HTML page:<svg width="300" height="200"><polygon points="100,10 40,180 190,60 10,60 160,180"  style="fill:lime;stroke:purple;stroke-width:5;fill-rule:evenodd;" /></svg>

Embed SVG Directly Into HTML Pages

SVG has some predefined shape elements that can be used by developers:

Rectangle <rect> Circle <circle> Ellipse <ellipse> Line <line> Polyline <polyline> Polygon <polygon> Path <path>

SVG Shapes

The <rect> element is used to create a rectangle and variations of a rectangle shape:

<svg width="400" height="110"> <rect width="300" height="100" style="fill:rgb(0,255,256);stroke-width:3;

stroke:rgb(0,0,0)"> Sorry, your browser does not support inline

SVG. </svg>

SVG Rectangle - <rect>

The width and height attributes of the <rect> element define the height and the width of the rectangle

The style attribute is used to define CSS properties for the rectangle

The CSS fill property defines the fill color of the rectangle

The CSS stroke-width property defines the width of the border of the rectangle

The CSS stroke property defines the color of the border of the rectangle

Code explanation:

<svg width="400" height="180"><rect x="50" y="20" width="150" height="150" style="fill:blue;stroke:pink; stroke-width:5;fill-opacity:0.2;stroke-opacity:0.9">Sorry, your browser does not support inline SVG. </svg>

SVG Ractangle <rect> Example 2

<svg width="400" height="180"> <rect x="50" y="20" width="150" height="150" style="fill:blue;stroke:pink;stroke-width:5;

opacity:0.5"> Sorry, your browser does not support inline SVG. </svg>

The CSS opacity property defines the opacity value for the whole element (legal range: 0 to 1)

SVG Ractangle <rect> Example 3

The <circle> element is used to create a circle:

<svg height="100" width="100"><circle cx="50" cy="50" r="40" stroke="black" stroke-width="3" fill="blue" />Sorry, your browser does not support inline SVG. </svg>

SVG <circle>

Code explanation: The cx and cy attributes define the x and y

coordinates of the center of the circle. If cx and cy are omitted, the circle's center is set to (0,0)

The r attribute defines the radius of the circle

SVG <circle>

The <ellipse> element is used to create an ellipse.

An ellipse is closely related to a circle. The difference is that an ellipse has an x and a y radius that differs from each other, while a circle has equal x and y radius:

SVG Ellipse - <ellipse>

<svg height="140" width="500">  <ellipse cx="200" cy="80" rx="100" ry="50"  style="fill:yellow;stroke:purple;

stroke-width:2" /></svg>

The cx attribute defines the x coordinate of the center of the ellipse

The cy attribute defines the y coordinate of the center of the ellipse

The rx attribute defines the horizontal radius The ry attribute defines the vertical radius

SVG Ellipse - <ellipse>

<svg height="150" width="500"><ellipse cx="240" cy="100" rx="220" ry="30" style="fill:purple" /><ellipse cx="220" cy="70" rx="190" ry="20" style="fill:lime" /><ellipse cx="210" cy="45" rx="170" ry="15" style="fill:yellow" /> Sorry, your browser does not support inline SVG. </svg>

SVG Ellipse - <ellipse>

SVG Ellipse - <ellipse>

SVG <line> The <line> element is used to create a line:

<svg height="210" width="500"> <line x1="0" y1="0" x2="200" y2="200" style="stroke:rgb(255,0,0);stroke-width:2" /> Sorry, your browser does not support inline SVG.</svg>

The x1 attribute defines the start of the line on the x-axis

The y1 attribute defines the start of the line on the y-axis

The x2 attribute defines the end of the line on the x-axis

The y2 attribute defines the end of the line on the y-axis

Code explanation:

Polygon comes from Greek. "Poly" means "many" and "gon" means "angle".

The <polygon> element is used to create a graphic that contains at least three sides.

Polygons are made of straight lines, and the shape is "closed" (all the lines connect up).

SVG <polygon>

<svg height="210" width="500"> <polygon points="200,10 250,190 160,210" style="fill:lime;stroke:purple;stroke-width:1" /> Sorry, your browser does not support inline SVG.</svg>

SVG <polygon>

<svg height="250" width="500">  <polygon points="220,10 300,210 170,250 123,234" style="fill:lime; stroke:purple;stroke-width:1" /></svg>

SVG <polygon> Example 2

<svg height="250" width="500">  <polygon points="220,10 300,210 170,250 123,234" style="fill:lime; stroke:purple;stroke-width:1" /></svg>

SVG <polygon> Example 3

Change the fill-rule property to "evenodd":

<svg height="210" width="500">  <polygon points="100,10 40,180 190,60 10,60 160,180“   style="fill:lime; stroke:purple;stroke-width:5;fill-rule:evenodd;" /></svg>

SVG <polygon> Example 4

The <polyline> element is used to create any shape that consists of only straight lines:

<svg height="200" width="500">  <polyline points="20,20 40,25 60,40 80,120 120,140 200,180“ style="fill:none;stroke:black; stroke-width:3" /></svg>

SVG <polyline>

<svg height="180" width="500">  <polyline points="0,40 40,40 40,80 80,80 80,120 120,120 120,160“   style="fill:white;

stroke:red;stroke-width:4" /></svg>

SVG <polyline> Example 2

What is difference between SVG and Canvas?

Assignment

http://www.w3schools.com/svg/default.asp

References