Fractals Image: AutoSize Image Canvas Size to Fit Image
lazarus / 39-Graphics

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Boleeman · 2023-07-01 11:56

Hi All.

I have been playing around with a LSystem Fractal Image program and
wondered if anyone could possibly help in explaining how to add an
AutoSize Image Canvas Size to Fit Image  feature.

When I change the recursion level of a given fractal it's rendered
image gets bigger and is not shown completely on the Timage. Is there
a way of setting the image size automatically by pre-calculating the
range of X and Y pixel values?

Attached is a screenshot.
After compiling, click Pentaplexity in the listbox to render it. then
change iterations to 5 in the memo and click Draw.
When iterations = 4 is changed to iterations = 5  the picture becomes
too big for the image control

Thanx in advance.

I thought of using a BgraBmp image with a viewport to scroll, but not
sure really how to do it?

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Boleeman · 2023-07-02 06:26

Actually had an idea for autosizing.

Use a buffer and create 2 dynamic arrays that store the X and Y
coordinates of the points that are calculated by the fractal rules.
Then find the maximum X and Y values

Set the image size to just a bit bigger than that size.

Lastly write the fractal image to canvas.

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Boleeman · 2023-07-21 15:44

Some sample pictures from the program:

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lainz · 2023-07-22 12:33

Attached the PNG with transparency. Requires BGRABitmap and
BGRAControls.

Edit: wrong post, but of the same author so no problem?

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Boleeman · 2023-07-22 15:55

No problem here.

Wow thanks Sooooooo Much Lainz. So much appreciated.

Attached I have a whole lot of presets for the lsystem program. If
anyone wants to play around compile the program in post 1 and then
just copy the presets into the samples folder. Below are some latest
pictures.

I spent a number of "Addicted Hours making all sorts of cool graphics
designs". 212 different designs so far. The Lsystem program has a lot
of potential to make so very cool graphics designs. I will now try to
implement the BGRABitmap into it.

I am so happy playing with Lazarus. Along with BGRABitmap I see how it
has great graphics effects (much better than VB6). I just came across
that hurdle of implementing BGRABitmap and understanding what to do in
different parts of a program. The examples in the Wiki show small bits
and pieces but Lainz' code really helped.