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I never had anything to do with either project, but having used d3.js and similar frameworks I will take a stab at this.D3 is a pretty radical departure from the data visualisation frameworks of the past. Unlike Protovis, Raphaël or Processing, it does not come with a representation layer. This means there is no concept of circles, bars, lines fills and so on in d3 and it has no code to render them. Instead, it relies on the presence of a DOM to manipulate and lets the browser deal with the rendering.This is a pretty big deal, because it allows for much more freedom in representation, as you are not restricted to whatever representations your library supports. Even better: if browsers add new features, you can use them straight away. D3 is actually "lighter" than Protovis, but more powerful.To get back to your question: why stop development of Protovis and start d3.js: it's a logical way forward. D3 is what happened when Protovis shed the burden of having a hefty representation layer (half of the Protovis API is made up of Areas, Bars, Dots, Panels and Wedges) and moved on. A lot of the good stuff from Protovis actually lives on in d3. D3 inherited a lot of its core functionality from Protovis: a declarative syntax, chaining, layouts, geo projections, force calculation and so on. Just compare the API of Protovis [1] to that of D3 [2].If d3 is so much better, than why did Protovis ever exist in the first place? What happened that caused Protovis to be abandoned in favor of d3? My guess would be SVG and CSS3. Protovis was released in 2009 (so most of it was probably written before that time) and browsers have come a long way since then. In 2009, browser support for SVG was scarce [3]. SVG is amazingly powerful. It can do much more than would be humanly possible to add to Protovis. CSS3 adds native animated transitions to browsers that performs much better than custom transitions implemented in JavaScript. In 2009, D3 would have been all but useless. In 2012, the limited representation layer of Protovis is a drag on innovation.To hear some of this straight from the horse's mouth, you should read the section "Transformation, not Representation" of the d3.js introduction [4] and "d3.js For Protovis Users" [5][1] http://mbostock.github.com/protovis/jsdoc[2] https://github.com/mbostock/d3/wiki/API-Reference[3] http://caniuse.com/#search=svg[4] http://d3js.org/#transformation[5] http://mbostock.github.com/d3/tutorial/protovis.html

SVG | Scalable Vector Graphics —SVG is a 2D Graphics Framework that can be embedded in HTML5 Documents to create and display high-quality graphics and images on the web-page.SVG stands for Scalable Vector GraphicsWith SVG you can create following Graphics on the web-page:In This Tutorial, I will cover the whole concept of “ SVG in HTML5 “ in Five parts:[ A ] - Basics of SVG (Definitions, Features, Term, etc)[ B ] - SVG Render Box ( Where graphics are rendered )[ C ] - SVG Coordinates ( Heart of SVG Graphics)[ D ] - Create different SVG Graphics with different shape tags in HTML5[ E ] - Common Styling Properties for any SVG GraphicContent Index :|[ A ] - Basics of SVGGeneral Features of SVG (beginner)Technical Features of SVG (advanced)Pros and Cons of creating Graphics with SVGEmbedding of SVG Tag under HTML5[ B ] - SVG Render BoxMeaning of SVG Render BoxDefine a Render box on your webpageCustomize the Render Box with CSS[ C ] - SVG CoordinatesWhat are “ X & Y Coordinates “What is “ SVG X &Y Coordinates Graph”Features of SVG X & Y Coordinates[ D ] - Create different SVG Graphics with different shape tags in HTML5Create RECTANGLE <rect … />Create CIRCLE <circle … />Create ELLIPSE <ellipse …/>Create POLYGON <polygon …/>Create a LINE <line … />Create POLYLINE <polyline … />Add an IMAGE file <image … />[ E ] - Common Styling Properties for any SVG GraphicUse Style AttributeAdd Colors to graphicAdd borders to GraphicSo, without any further adieu let’s get started . . .[ A ] - Basics of SVG( 1 ) - General Features of SVG (beginner)SVG stands for Scalable Vector Graphics.Scalable Vector Graphics help in creation of 2D computer graphics by the positioning of 2D coordinate points i.e. X & Y coordinate points.With Scalable Vector Graphics or SVG, you can create graphics and images for web-pages.SVG is the best alternative to JPEG, PNG or GIF Images.|( 2 ) - Technical Features of SVG (advanced)Every element and attribute in SVG can be easily animated.SVG graphic has the ability to get searched, indexed, scripted and compressed.SVG is an open-source file standard.Graphics created with SVG are saved in the “ .svg “ format.SVG is an XML tag.SVG can be directly embedded in HTML Scripts, with the help of the SVG tag.<svg> . . . </svg>Even SVG Tag is embedded in HTML Documents but it still created in XML format, So, All tags within SVG Tag must be properly closed and all minimal to minimal annotations are properly audited and corrected because XML is a language which annotations and tags are case sensitive, so if not properly operated then may create unnecessary errors.|( 3 ) - Pros and Cons of creating Graphics with SVGPros :It can be edited with any Text Editor.It can be printed on any Quality and Resolution.It never gets faded or dismantled when Zoomed-in or Resized.It has a small file size, easily get downloaded and rendered by Browser.Cons :Creating Graphics with SVG is really a time taking process. For fast pace working, you can instead use images edited in image editors.More complex SVG graphics will reduce the loading speed of the website. (more complex graphic means having so many shape tags and SVG tags under single HTML document, with complex coordinate variations)Note:SVG is a W3C recommendation, as announcements made in 2001, 2003 and 2011.( 4 ) - Embedding of SVG Tag under HTML5We can simply embed SVG Tag in HTML by defining it under the body tag:<html> <head> </head> <body>  <svg> . . . </svg>  </body> </html> A HTML Document can have multiple SVG Tag embedded inside it.<html> <head> </head> <body>  <svg> . . . </svg> <svg> . . . </svg> <svg> . . . </svg> <svg> . . . </svg> <svg> . . . </svg>  </body> </html> [ B ] - SVG Render Box( 1 ) - Meaning of SVG Render BoxTo create an SVG Graphic, we first need to define an SVG Render Box under HTML5 Documents.SVG Render Box creates a Rectangular Restrictive Area, where your SVG Graphics will be rendered.SVG Graphics are rendered and visible under the specified Render Box only.That means . . .SVG Graphics will get cropped:If we give them a position outside the Render BoxOr if we give them a size bigger than Render Box|In the conclusion of the above statement, I can say that:Defining a render box will create a restrictive rectangular surrounding that restricts shape/ graphic not to render outside the render box.|( 2 ) - Define a Render box on your webpageDefining a Render Box for our webpage is actually the process of embedding of SVG Tag under HTML5.So, to define a Render Box we need to define the SVG tag<svg> . . . </svg> This will create a standard Rectangular Render Box with a ratio of 1:2.You can also define custom sizes of the Render box by defining its height and width with the help of height & width attributes.<svg height="200px" width="200px">   . . .   </svg> |( 3 ) - Customize the Render Box with CSSYou can fully customize the Render Box with the help of Cascading Style Sheets i.e. CSS.Here are some customisations that you can make with CSS :By default, the Render box has transparent background,Change Background colorTo change background color of SVG Render Box, use Style attribute under SVG Tag.<svg height="100px" width="200px" style="background-color: grey;">  ...  </svg> Test your Code >>Add a Border to Render BoxWe can also define Border styling for SVG Render Area, with the help of CSS Style attribute under SVG Tag.<svg height="100px" width="200px"  style="border:5px solid black; background-color: grey;">  ...  </svg> Test your Code >>[ C ] - SVG X & Y Coordinates( 1 ) - What are “ X & Y Coordinates “It is very necessary to learn SVG X & Y Coordinates because Coordinates are the heart of SVG Graphics and if you don’t know how to measure the coordinates then you can never create SVG Graphics.Creating graphics on SVG is all about measuring, controlling and defining its coordinates.now let’s get straight to the technical terms …X & Y Coordinates are the numerical address of Dots that are drawn on an X-Axis & Y-Axis Graph.The address of Dots is measured by getting their position on the X-Axis Scale and Y-Axis Scale.To measure the position of Dot, numerical values are assigned to the X & Y axis scale, on the graph.In the following figure/graph, X & Y Coordinates of Point are 5 & 6.( 2 ) - What is “ SVG X & Y Coordinates Graph “Coordinates for SVG graphic purposes can be calculated on SVG X & Y Coordinates Graph only.FIG.1 is a normal coordinate graph.FIG.2 is an SVG X & Y Coordinates Graph.Height is calculated on Y-Axis, and Width is calculated on X-Axis.( 3 ) - Features of SVG X & Y CoordinatesYou can create amazing and complex graphics if you have successfully learned how to measure SVG X & Y Coordinates.SVG X & Y Coordinates are used to define height, width, and position of actual Graphics drawn on the Render Box.X & Y coordinates are often called X & Y Coords.Note :The calculation of coordinates for different SVG Graphics is bit different because every Shape has its own specifications and modifications.So, I’ve explained each coordinate pattern separately with each SVG graphic.[ D ] - Create different SVG Graphics with different shape tags in HTML5To create SVG graphic you first need to define a render box always :<svg height="200px" width="400px" style="background-color:grey">  </svg> I am giving a grey color to render box so that we can see it’s rendering limits. But the color is not so necessary and we can remove it later when our work is done.( 1 ) - Create Rectangle GraphicTo create a rectangle graphic define <rect /> tag under SVG tag :<svg height="200px" width="400px" style="background-color:grey">   <rect   />   </svg> Now define the height and width of the rectangle graphic to give it some visibility :NOTE:It is necessary to define the size of SVG Graphic because in SVG a Graphic with no size defined will not be visible under the Render Box because an SVG graphic has a default size of zero. The default size of zero is used by SVG when no size measurements are defined.You can define height and width with the help of height and width attribute :width="100px"height="200px"<svg height="200px" width="400px" style="background-color:grey">   <rect    height="100px" width="200px"  />   </svg> Test The Codes > > >By default, the rectangle graphic is positioned to the top left corner of the render box, because its default position value is zero.Change the position of Rectangle Graphic :You can change the position of a rectangle by changing the location of its positioning center.Note :The top left corner of the rectangle is taken as the positioning center.To change the location of the positioning center you need to define the coordinates of the positioning center with the help of SVG X & Y coordinate.You need to define such coordinates points under the <rect /> tag with the help of X and Y attribute :x="20px"y="30px"here . . .x=”20″ specifies that how many coordinates, the edge of rectangle will be far from Y axis,and y=”30″ specifies that how many coordinates the edge of rectangle will be far with X axis. (see following example)<svg height="200px" width="400px" style="background-color:grey"> <rect   height="100px" width="200px"   x="20px" y="30px"  />   </svg> Test These Codes > > >Now lets give some stylings to our rectangle to make it more beutifulGive some colors to SVG Rectangle Graphic<svg height="200px" width="400px" style="background-color:grey">  <rect    height="100px" width="200px"   x="20px" y="30px"    style="fill: yellow;"  />   </svg> Test These Codes > > >Give Borders to SVG Rectangle Graphic<svg height="200px" width="400px" style="background-color:grey">   <rect    height="100px" width="200px"   x="20px" y="30px"   style="fill: yellow; stroke-width: 5; stroke : black;"  />   </svg> Test These Codes >>>Make Curved borders with rx and ry attributes :rx="20px"ry="20px"<svg height="200px" width="400px" style="background-color:grey">   <rect   height="100px" width="200px"   x="20px" y="30px"   rx="20px" ry="20px"    style="fill: yellow; stroke-width: 5; stroke : black;" />   </svg> Test These Codes >>>You can also add multiple rectangles in the same render boxYou can render multiple rectangles in the same render box by just adding multiple rect tags under the SVG tag.Always remember :Any shape tag that is added before any other shape tag gets superimposed to that any other shape tag, for example, if circle tag added before rect tag then circle tag will be superimposed on the rect tag.If you do not define different positions for different shape tags then they will get superimposed on each other.<svg height="200px" width="400px" style="background-color:grey">   <rect   Width="190px" height="90px"   X="20px" Y="30px"   rX="10px" rY="10px"    style="fill: yellow; stroke-width: 5; stroke : black;" />   <rect   width="150px" height="70px"   X="230px" Y="30px"   rX="15px" rY="15px"    style="fill: skyblue;" />   <rect   width="100px" height="50px"   X="20px" Y="130px"   style="fill: pink; stroke-width: 2; stroke : red;" />  </svg> Test These Codes >>>( 2 ) - Create Circle GraphicTo create a circle graphic you must define <circle /> tag under SVG tag :<svg height="200px" width="400px" style="background-color:grey">   <circle  />   </svg> Now define the Size of this circle graphic by defining its radius with the help of “ r “ attribute and give some styling also :<svg height="200px" width="400px" style="background-color:grey">   <circle    r="40px"    style="fill : skyblue; stroke : red; stroke-width : 5;"   />   </svg> Test These Codes >>>In the above result, you can see that only the quarter part of the circle is visible so to make it fully visible you need to change its position.To change the position of circle graphic you need to change the position of its positioning center.The center point of the circle is taken as its positioning center.To change the position of the positioning center you need to define its coordinates with the help of cx and cy attribute under the <circle /> tag.cx & cy stands for center x and center ycx defines how many coordinates the circle is far from the y-axis.cy defines how many coordinates the circle is far from the x-axis.<svg height="200px" width="400px" style="background-color:grey">   <circle    r="40px"   cx="155px" cy="85"    style="fill : skyblue; stroke : red; stroke-width : 5;"   />   </svg> Test These Codes >>>( 3 ) - Create EllipseEllipse is an Oval shaped circle.To create an Ellipse graphic you must define <ellipse /> tag under SVG tag :<svg height="200px" width="400px" style="background-color:grey">   <ellipse  />   </svg> Now you can define the size of the ellipse by defining its horizontal and vertical radius with the help of rx and ry attribute and define some style properties also.rx defines the horizontal radius for the ellipse, andry defines the vertical radius for the ellipse.<svg height="200px" width="400px" style="background-color:grey">   <ellipse   rx="150px" ry="75px"   style="fill : skyblue; stroke : red; stroke-width : 5;"  />   </svg> Test These Codes >>>In the above result, you can see that only the quarter part of the ellipse is visible so to make it fully visible you need to change its position.Positioning rules of an ellipse is same as positioning rules of circle:<svg height="200px" width="400px" style="background-color:grey">   <ellipse   rx="100px" ry="55px"   cx="150px" cy="100px"   style="fill : skyblue; stroke : red; stroke-width : 5;"  />   </svg> Test These Codes >>>( 4 ) - Create PolygonPolygon is a freestyle figure where you can create a figure of any shape with as many as sides you want.To create a Polygon graphic you must define <polygon /> tag under SVG tag :<svg height="200px" width="400px" style="background-color:grey">   <polygon   />  </svg> Creating polygon in SVG is very easy,you just need to define the position of Dots in the Area of the Render Box with the help of SVG X&Y coordinates and then SVG will automatically join these Dots to create a figure.NOTE:To create a polygon, you need to define at least three Dots,SVG needs three Dots to create a polygon,Because a polygon has minimum of three sides,So, Two Dots will only create One Line, and Three Dots will create Three Lines or you can say three sides.Following is the method to define the position of dots in the area of the Render Box :Every Dot has its own X & Y coordinate address.So, to define the position of dots, we just need to define their X & Y coordinate address.Dots can also be said as Points.In the following figure, the coordinate values/ address of point(x, y) is (5, 4).And by following the above formula we can create multiple points:here,point(x1, y1) has (3 ,2 ) andpoint(x2, y2) has ( 6,5 ) andpoint(x3, y3) has (2,6 ) coordinate values.SVG will join these coordinate in order of numerical priority,under which, SVG will first join X1 and Y1 with X2 and Y2, and then join X2 and Y2 with X3 and Y3, and then join X3 and Y3 with Xn and Yn, and so on. And when no more Coordinates Points are defined then it will join back Xn and Yn with X1 and Y1 to create a closed figure.These coordinate points can be defined under <polygon /> tag with the help of Points attribute, in the following format :Points =" x1,y1 x2,y2 x3,y3 xn,yn " Points =" 3,2 6,5 2,6 " |<svg height="200px" width="400px" style="background-color: grey">   <polygon   Points =" 150,10 200,160 130,180 "     style="fill: yellow; stroke-width: 5; stroke : black;" />   </svg> Test These Codes >>>Another example of polygon created with svg:<svg height="200px" width="400px" style="background-color: skyblue;" >  <circle    r="100" cy="100" cx="200"    style="fill:white; stroke:purple; stroke-width:2" />      <polygon     points=" 200,0 278,40 288,145 200,200 109,140 120,40"    style="fill:lime; stroke:purple; stroke-width:2" />     <circle    r="80" cy="100" cx="200"   style="fill:white; stroke:purple; stroke-width:2" />      <polygon     points=" 200,20 258,45 268,139 200,180 131,140 143,45"    style="fill:lime; stroke:purple; stroke-width:2" />   </svg> Test These Codes >>>( 5 ) - Create LineTo create a Line you must define <line /> tag under SVG tag :<svg height="200px" width="400px" style="background-color:grey">   <line   />  </svg>> To create a Line in SVG, you just need to define Two coordinate points.When you define these two points, SVG will automatically join them to create a Line.NOTE:- You cannot define more than or less than two points.These Two points can be said as Starting Point and End Point.Starting coordinate point can be defined by x1 and y1 attributes under <line /> tagx1="20" y1="50" End coordinate point can be defined by x2 and y2 attributes under <line /> tagx2="200" y2="100"  See the following example :<svg height="200px" width="400px" style="background-color:yellow;">   <line    x1="20" y1="50" x2="200" y2="100"     style="stroke:black;stroke-width:2"   />  </svg> Test These Codes >>>( 6 ) - Create PolyLineTo create a Polyline you must define <Polyline /> tag under SVG tag :<svg height="200px" width="400px" style="background-color:yellow">   <polyline   />  </svg> All the rules of creating Polygon can be applied in the creation of Polyline.But the difference is only that,In Polygon, SVG will join all of its points with each other to create a closed poly figure.But in the case of Polyline, SVG will join its points to create a polyline (e.g. zig-zag line) and not create a closed figure.So, SVG will join these coordinate points in order of numerical priority,under which, SVG will first join X1 and Y1 with X2 and Y2, and then join X2 and Y2 with X3 and Y3, and then join X3 and Y3 with Xn and Yn, and so on. But It will never join back Xn and Yn with X1 and Y1.NOTE:Don’t forget to Specify fill property as “none” otherwise it will create a hard fill under the area of curved lines.style=" fill : none "<svg height="200px" width="400px" style="background-color:yellow;">    <polyline   points="0, 0 100, 40 200, 150"  style="fill:none;stroke:black;stroke-width:2;"   />  </svg> Test These Codes >>>Or instead defining fill=“none” you can define a color,<svg height="200px" width="400px" style="background-color:yellow;">    <polyline   points="0, 0 100, 40 200, 150"  style="fill:red;stroke:black;stroke-width:2;"   />  </svg> Test These Codes >>>We can create more complex polylines by just specifying more coordinate points.<svg height="200px" width="400px" style="background-color:yellow;">    <polyline   points="20,20 40,25 60,40 80,120 120,140 200,180"  style="fill:none;stroke:black;stroke-width:2;"   />  </svg> Test These Codes >>>Create Zig-Zag line:<svg height="200px" width="400px" style="background-color:yellow;">   <polyline   points="0,80 50,40 100,80 150,40 200,80 250,40 300,80 350,40   400,80"  style="fill:none;stroke:black;stroke-width:2;"   /> </svg> Test These Codes >>>( 7 ) - Add Image Files in SVG (Add Images in SVG)You can add Jpg, Png and other Images in SVG Render Box.To Add an image file you must define <image /> tag under SVG tag :<svg height="200px" width="400px" style="background-color:yellow">   <image   />  </svg> You can add an image in SVG Href attribute.Href attribute is used to catch the image file location.The size of the Image can be defined with the help of the Height and Width attribute.Changing the position of an Image is the same as changing the position of a rectangle graphic in SVG.<svg height="250px" width="400px" style="background-color:yellow;">  <image  href="pic_trulli.jpg"  height="130px" width="260px" x="10px" y="10px"  />   </svg> Test These Codes >>>[ E ] - Common Styling Properties for any SVG GraphicThe following Styling properties can be commonly used with any SVG Graphic.Use the Style attribute under the shape tag to give it the styling properties<shape style=" " /> Add colors to GraphicYou can give colors to graphics with the help of “ fill “ property under style attribute:style=”fill : colorname;”<shape style="fill : red;" /> You can even control the transparency of the color with the help of “ fill-opacity “ property:style=“fill-opacity : 0.3;”<shape style="fill : red; fill-opacity : 0.3;" /> Opacity value range from 1.0 - 0.0 like 0.3, 0.4, etc.Add borders to graphicYou can give borders to graphics with the help of stroke property under style attribute.stroke : colorname; //defines color of border (mandatory)stroke-width : 5; //defines strength of border (mandatory)stroke-opacity : 0.5; //control transparency of border (optional)here is the combined formula :style=”stroke : blue; stroke-width : 5; stroke-opacity : 0.7;”<shape style="stroke : blue; stroke-width : 5; stroke-opacity : 0.7;" /> I would love to hear your problems in the comment section,LEAVE UPVOTE,Hit the Follow Button,

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