BgraBmp: How to Make a Decorative Shadowed Circle Effect?
lazarus / 39-Graphics

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Boleeman · 2025-08-14 09:17

I was wondering if anyone knows how to make a Decorative Shadowed
Circle Effect, as shown in the attached png.


I can't seem to get that effect happening.

Basically a rough hole (mask ?) in the middle, with random
intersecting 3D-ish circle lines with a slight shadow.
Sort of reminds me of a birds nest pattern, with a 3D effect.

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lainz · 2025-08-14 12:38

It's easy, just draw white circles randomly in a transparent
background. Then erase circle antialias (or ellipse) in the center.
Then shadow the bitmap..

Here the shadow code:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
SingleColor(Bitmap: TBGRABitmap; Color: TBGRAPixel);var  i: integer; 
p: PBGRAPixel;begin  p := Bitmap.Data;   for i := Bitmap.NBPixels - 1
downto 0 do  begin    p^.red := Color.Red;    p^.green :=
Color.Green;    p^.blue := Color.Blue;    Inc(p);  end;end; function
Shadow(Source: TBGRABitmap; Color: TBGRAPixel; Blur: integer):
TBGRABitmap;begin  Result := TBGRABitmap.Create(Source.Width + (2 *
Blur), Source.Height + (2 * Blur));  Result.PutImage(Blur, Blur,
Source, dmDrawWithTransparency);  SingleColor(Result, Color); 
BGRAReplace(Result, Result.FilterBlurRadial(Blur, rbFast));end;

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Dzandaa · 2025-08-14 17:23

Hi,

@Booleman:

Here, just a quick project

B->

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Dzandaa · 2025-08-15 16:25

Hi,

@Booleman:

Another approach

Have a nice day.

I like your challenges!!!

B->

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lainz · 2025-08-15 22:40

This is my version =)

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Boleeman · 2025-08-16 07:58

Was trying to work this out but was going round in circles.

Wow a BIG THANK YOU to both Dzandaa and Lainz.

Much Appreciated.