Integrate Zoom function in Drawing app (javascript/processingjs)

Hello again, I have read the brief and I will be able to implement the zoom in an efficient way. I will also clean a bit the code if you want (replace most hard-coded values with constants or variables that you can change easily, eg: if you change the default canvas size you won't have to replace the 555px value in multiple places). Thank you!

Hi, I (Myself a senior PHP, ASP.NET programmer using C# and VB) have a team having experience of more than 10 years in developing web and mobile applications. I have a team of expert programmers who write robust and bug-free codes at the very first instance. After seeing our quality of work and the cooperation offered to you even after the work has been delivered to you, you’ll come to us again and again to avail our services. I read through the job details extremely carefully and I am absolutely sure that I can do the project very well. I can achieve the results that you are asking for within your timeframe and budget. I am confident I can exceed your expectations and I would love to work on your project. Thanks, Priyanka