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Thank You Readers!

I just want to express my sincere thanks to readers of my blog who have left comments on my posts. Most of the comments have been very encouraging. I really appreciate them.

Many of my posts are the results of experiments I do outside my work. I love my job at Adobe and I totally enjoy the work I do there. However I cannot publicly talk about most of the work until the product is released e.g. I have been working on a very interesting idea since the last one month, but cannot talk about it now. So many of my posts may not be related to the work I do at Adobe. Fortunately Adobe, and specifically my group, has always encouraged learning and experimenting with new technologies.

Again, thanks for your encouraging feedback.

-Ram Kulkarni

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JavaScript Graphics Libraries

Last year I was evaluating options for JavaScript graphics libraries for ColdFusion Builder ORM extension. The extension lets you select tables from a datasource and displays it in a browser window. You can them configure relationships, table fields, data types etc and generate CFC code. Here is the screen shot of that extension.

I evaluated SVG and Canvas for graphics/drawing in this extension. However Canvas was not supported in Internet Explorer at that time. SVG was supported on all desktop browsers, but Android browser at that time did support SVG (Android version was 2.2 then) . Since this application was meant to be used on desktop, I decided to go with SVG. Fortunately I came across a very good SVG JavaScript library, RaphaelJS, which made drawing and manipulating shapes in the web page a lot easier. I used JQuery + RaphaelJS together in my application. I used these two libraries for my another extension to monitor CF server memory.
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Challenges in implementing ColdFusion Builder

ColdFusion 10 and ColdFusion Builder 2.0.1 released this week, on 14th May. My article on What’s new in ColdFusion Builder 2.0.1 is published on the Adobe Developer Connection. I have been working on ColdFusion Builder for close to 3.5 years now and the release of updater this week has put me in a mood to reflect on challenges we have faced so far.
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OOP in JavaScript: Class in various Avatars

I have done more JavaScript programming in the last couple of months than I have ever done before, and I have started liking it. I had used JavaScript before, but only for simple use cases like form field validations, alerts or taking simple input. Recently I have been looking at ways to do Object Oriented Programming (OOP) using JavaScript, and what struck me initially odd about it was different forms a function can take and different ways in which you can use them.

Functions can be treated as Class in JavaScript. They can have member variables and methods. I have seen many different ways in which this can be coded
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A Simple HTML5 Game



My son is having summer vacation and he wanted to learn animation and create games. He had learnt Flash and ActionScript a couple of years back. So he started developing a game in Flash. However he ran into few issues and sought my help. Since I don’t know Flash, I could not help him much. But I suggested that if he develops his game in HTML5, I could help him. So while teaching him HTML5 and animation, I ended up creating a very simple game, which I want to share here.
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Using PhoneGap Media APIs

Last week I blogged about a problem I was facing when recording audio on iOS, using PhoneGap Media APIs. I was seeing following error in the debug console –

ERROR: Method ‘create:withDict:’ not defined in Plugin ‘Media’

and audio was not recorded.

I logged a bug for this in the PhoneGap’s bug tracker, and it turned out that it was not really a bug in PhoneGap. The PhoneGap team responded quickly (thanks Filip and Shazron) and guided me to the solution.
The solution is in fact documented on the PhoneGap API Reference site, but it is easy to miss.This is what I learnt –

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My Experiment with iOS Development

Last week I decided to experiment with iOS development. When I had started out learning Android development, it was not very difficult. Android programs are written in Java, which I have been using for many years and IDE used for Android development is Eclipse, which I have been using for many years now. All I had to get familiar was Android APIs.

However iOS development is very different for me. Applications are written in Objective-C, IDE is Xcode and they have to be developed on Mac platform using Cocoa framework. I have no experience with Objective-C, Xcode and Cocoa framework and have used Mac very little, only when I had to debug ColdFusion Builder issues specific to Mac. So I was not expecting smooth sailing; and I was not disappointed.
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Improving Animation Performance in HTML5 Canvas – Part II

In this post I had described how I was able to improve performance of animation in HTML5 Canvas by using a backup Canvas. The trick was to draw static part of the main Canvas on the backup Canvas and whenever any object moves (during animation), draw the content of backup Canvas on to the main Canvas first and then draw moving objects. I had optimised this by copying only a part from the backup Canvas that was exposed by the moving object. This gave me much better animation performance than redrawing scene every time.

Though the animation was better, I was still not happy with the performance. It worked fine on small devices like phones, but animation was still not very smooth on tablets. So I started looking for ways to improve it further.
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File Chooser Dialog for PhoneGap Applications

I needed a file chooser dialog box for an application I am working on. Android APIs do not have File Chooser dialog, and I had created my own native Android File Chooser dialog for my application Annotated Call Log. However I did not want to use that for my current application, because it needs to run on iOS too.

A quick search on the Web for PhoneGap based file chooser dialog did not give me what I was looking for, so I decided to create one using PhoneGap file APIs, JQuery and JQuery Mobile. You can find the source code here. The page won’t display much in the browser. Use ‘View Source’ of your browser to see the source code.
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Improving Animation Performance in HTML5 Canvas

I have been working on an application that performs some animation in HTML5 Canvas. The animation involves drawing of stokes,images and moving images. Initially I took the easiest path for coding animation, which is clearing canvas every time and drawing new positions of objects. When tested this application on my laptop, in Chrome, everything worked fine and performance was satisfactory.

However when I ran the same application on my Xoom tablet, animation was extremely slow. Obviously clearing canvas and redrawing everything again and again was not a good idea. I did know that this approach was bad for animation, but since it worked fine on my laptop, I did not bother to change it initially. However I was surprised by how bad it performed on Android. I saw many complaints about performance of Canvas on Android in many forum posts and blogs. Apparently, as per many posts, performance of Canvas is much better on iOS than Android, but I can’t confirm this.
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