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Author Topic: Mag  (Read 1686 times)
Description: Why initial value of mag is 6.66666667e-01 ?
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Adam Majewski
Fractal Lover
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Posts: 221


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Mag
« on: January 09, 2015, 05:25:17 PM »

Hi

First question :

In  Image Calculation Parameters there is :

 CENTER-MAG=[Xctr/Yctr/Mag[/Xmagfactor/Rotation/Skew]]

where mag in case of type=mandel has initial value :

 mag = 6.66666667e-01

?

Why ? Why not 1 ( no zoom ) ?


Second question :
Can you find the source code where center-mag and corners are computed  :
*   after zoom
* after reading par file

?


TIA

Adam
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Ryan D
Alien
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Posts: 36


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« Reply #1 on: January 11, 2015, 10:58:04 PM »

First question :

In  Image Calculation Parameters there is :

 CENTER-MAG=[Xctr/Yctr/Mag[/Xmagfactor/Rotation/Skew]]

where mag in case of type=mandel has initial value :

 mag = 6.66666667e-01

?

Why ? Why not 1 ( no zoom ) ?

If the magnification is set to 1, the range on the Y axis is +1 to -1 - this is zoomed in too much and cuts off some of the top & bottom bulbs on the Mandelbrot set.  With magnification set to .666666667, the range on the Y axis is +1.5 to -1.5, which gives a view of the complete Mandelbrot set.

Second question :
Can you find the source code where center-mag and corners are computed  :
*   after zoom
* after reading par file

?

After the fractal has been drawn, press the letter "z" - this brings up a screen showing the parameter values and the fractal formula.  Then press F6 - this brings up the centre of the screen and the magnification amount.  Then press F7 - this converts the center-mag numbers to the corners of the screen.  Pressing F7 again takes you back to the center-mag values.

Ryan
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Adam Majewski
Fractal Lover
**
Posts: 221


WWW
« Reply #2 on: January 13, 2015, 05:26:50 PM »

Thx for the answer.
See wikibooks ( you are wellcome to edit )
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