Comments on: 2D Function Plotter

By: Wojtek Skulski

Wojtek Skulski — Thu, 10 Feb 2011 01:39:36 +0000

Hi, it would be great if you could add IE support using excanvas. Yes, I know I should be switching to Chrome. But meanwhile please add excanvas, which according to the reviews should be adequate for simple plots. Thank you — Wojtek

By: Samuel Huang

Samuel Huang — Mon, 17 May 2010 17:13:11 +0000

Nice tool! Please note that

would allow the user to execute plot with the ENTER key (instead of refreshing screen). Also, for security, I think a “white list” of allowed Math.* functions and the variable “x” then then current “black list” implementation.

By: operaguy

operaguy — Wed, 12 May 2010 19:18:44 +0000

works in Opera

By: Ed Mackey

Ed Mackey — Mon, 03 May 2010 00:34:18 +0000

Hi Thomas, sure that sounds great! Can you post some screenshots someplace?

By: Thomas

Thomas — Sun, 28 Mar 2010 09:25:00 +0000

I used your code to implement a webOS app for my palm pre. I would like to publish it as a free app in the official app catolg. It goes without saying that I will refer to you and your blog. I hope you agree.

By: Ed Mackey

Ed Mackey — Thu, 28 Jan 2010 03:08:24 +0000

Shaun, the variable x, which appears unused, is actually the main “x” that’s used by the formulas being evaluated. In other words “x” is being used by the Eval() call in that plot() function (for most formulas). The other ones, xPos and yPos, are the corresponding canvas pixel locations, and their relationship to x and y are determined by the zoom and stretch levels.

By: Shaun

Shaun — Tue, 26 Jan 2010 16:59:32 +0000

Looking through the source code it looks as though var x is defined in the plot() method and then isnt actually used. how is the scaling being applied to xPos?

Great app though.