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- Press and hold on the area you want to zoom in on.
- Swipe up and down to zoom in and out at your current center point
- Swipe left and right to increase and decrease the resolution.
(At close-up zooms, iterations can take an incredibly long time to produce a "good" image)
- Press the menu button and "Save to SD card" to save the generated image for use as a wallpaper or to send through email or text message SMS.
The "Mandelbrot Set" is defined by the equation:
Zn+1 = Zn^2 + c
The "c" in this equation can be a normal decimal number, or it can be an "imaginary number". Imaginary numbers are numbers that attempt to define the square root of a negative number. No number multiplied by itself will result in a negative number, so mathematicians have explained this phenomenon with the math symbol "i" which is defined as the square root of negative one. The "Mandelbrot Set" lies on a plane where the left to right x values are the real number components of "c" and the up-down y values are the imaginary number i components of "c".
The equation above is the type where the result of the equation is fed back into itself in what is called recursion or a recursive function. Initially a point is chosen within this real-imaginary plane and the equation is repeatedly applied until it can be determined that that starting point "escapes" or is part of the set.
The rainbow colors of this app are achieved by assigning a slightly different color to each point depending upon how many iterations it takes to determine that that point escapes the "Mandelbrot Set".
For a better description of "Mandelbrot Sets" and fractals, please visit these wikipedia entries:
* Added zoom-in and zoom-out using swipe up/down.
* Added the ability to start by using a smaller image until you are able to find a good place where you want to see the Mandelbrot in its full glory.