Introduction

In this article, we are going to understand the concept of Modifying the curve using HTML 5. In this, we can change the curve while it is displaying on the browser.
Here we will use some JavaScript and some styles along with the HTML code. Just go through the steps to see how to create this application.
Let's see how the modify-curve application can be created. To do so go through the following steps.
Step 1 : Open a HTML editor or Visual Studio.
sd.gif
Open File menu ->select new ->Choose Website then.
0000.jpg
This is where we will create an HTML5 application.
md1.gif
Step 2: In this section, we will create the style for the media and create the .css on the media screen. Put the given script in the Head section of the HTML or in between the <head>--</head>.
Here two CSS files are used for design purposes; one is for the section div, named d1.css and the other d2.css for the whole body of the web page.
d1.css scripting
  1. body {
  2. background: #FFFF99;
  3. color: #fff;
  4. font: 300 100.1% "Helvetica Neue" , Helvetica, "Arial Unicode MS" , Arial, sans-serif;
  5. }
  6. #holder {
  7. height: 442px;
  8. left: 42%;
  9. margin: -240px 0 0 -320px;
  10. position: absolute;
  11. top: 57%;
  12. width: 842px;
  13. font-size: x-large;
  14. background-color: #008000;
  15. }
  16. #duplicate {
  17. bottom: 0;
  18. font: 300 .7em "Helvetica Neue", Helvetica,;
  19. position: absolute;
  20. right: 1em;
  21. text-align: right;
  22. }
  23. #duplicate d {
  24. color: #fff;
  25. }
  26. d2.css scripting.body {
  27. background: #fff;
  28. color: #000;
  29. font: 100.1% "Comic Sans MS", Lucida, Verdana, sans-serif;
  30. }
  31. #holder {
  32. height: 480px;
  33. left: 50%;
  34. margin: 0 0 0 -320px;
  35. position: absolute;
  36. top: 0;
  37. width: 640px;
  38. }
  39. #duplicate {
  40. bottom: 0;
  41. font-size: .7em;
  42. position: absolute;
  43. right: 1em;
  44. text-align: right;
  45. }
Step 3: In this part, we need to work on some JavaScript over here. For understanding the full working of JavaScript download the attached .rar file and run the modifycurve application.
The whole JavaScript looks like as follow.
  1. window.onload = function() {
  2. var dragger = function() {
  3. this.ox = this.type == "rect" ? this.attr("x") : this.attr("cx");
  4. this.oy = this.type == "rect" ? this.attr("y") : this.attr("cy");
  5. this.animate({
  6. "fill-opacity": .2
  7. }, 500);
  8. },
  9. move = function(dx, dy) {
  10. var att = this.type == "rect" ? {
  11. x: this.ox + dx,
  12. y: this.oy + dy
  13. } : {
  14. cx: this.ox + dx,
  15. cy: this.oy + dy
  16. };
  17. this.attr(att);
  18. for (var i = connections.length; i--;) {
  19. r.connection(connections[i]);
  20. }
  21. },
  22. up = function() {
  23. this.animate({
  24. "fill-opacity": 0
  25. }, 500);
  26. },
  27. r = Color("holder", 640, 480),
  28. connections = [],
  29. shapes = [r.ellipse(190, 100, 30, 20),
  30. r.rect(290, 80, 60, 40, 10),
  31. r.rect(290, 180, 60, 40, 2),
  32. r.ellipse(450, 100, 20, 20)
  33. ];
  34. for (var i = 0, ii = shapes.length; i < ii; i++) {
  35. var color = Color.getColor();
  36. shapes[i].attr({
  37. fill: color,
  38. stroke: color,
  39. "fill-opacity": 0,
  40. "stroke-width": 2,
  41. cursor: "move"
  42. });
  43. shapes[i].drag(move, dragger, up);
  44. }
  45. connections.push(r.connection(shapes[0], shapes[1], "#fff"));
  46. connections.push(r.connection(shapes[1], shapes[2], "#fff", "#fff|5"));
  47. connections.push(r.connection(shapes[1], shapes[3], "#000", "#fff"));
  48. };
Step 4: In this section, we are going to become familiar with the body part of HTML scripting. Replace this script from the body section of the roundaboutpointer.aspx page.
Here we pass a #holder in the div id that is defined in the d1.css file.
  1. <body>
  2. <p>
  3. Modifying The Curve
  4. </p>
  5. <hr>
  6. <div id="holder"></div>
  7. </body>
Step 5: The Complete code for Playground application.
  1. <%@ Page Language="C#" AutoEventWireup="true" CodeFile="modifyingcurve.aspx.cs" Inherits="_Default" %>
  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  3. <html
  4. xmlns="http://www.w3.org/1999/xhtml">
  5. <head runat="server">
  6. <link rel="stylesheet" href="d1.css" type="text/css" media="screen">
  7. <link rel="stylesheet" href="d2.css" type="text/css" media="print">
  8. <script src="dee.js" type="text/javascript" charset="utf-8"></script>
  9. <script src="dee1.js" type="text/javascript" charset="utf-8"></script>
  10. <style type="text/css" media="screen">
  11. #holder
  12. {
  13. -moz-border-radius: 10px;
  14. -webkit-border-radius: 10px;
  15. border: solid 1px #333;
  16. }
  17. p
  18. {
  19. text-align: center;
  20. }
  21. </style>
  22. </head>
  23. <body>
  24. <p>
  25. Modifying The Curve
  26. </p>
  27. <hr>
  28. <div id="holder"></div>
  29. </body>
  30. </html>
Step 6 : Output Press F5
Note: For the accurate output of HTML5 applications, you must have the Google Chrome browser on your PC. You can change the position by dragging the pointer to any rectangular boxes, ellipse, and circle as shown in the figure.
md2.gif
After Changing the curve the figure looks as given.
md3.gif
Here are some useful resources
Change the Curve Position Using HTML 5
How to Draw the Bézier curve in Windows Phone 7
Using Powershell create, modify and delete search scope display group in SharePoint 2010
Selecting and Modifying elements using JQuery
Drawing Bezier Curves in WPF