Lines Animation: Horizontal, Vertical, Diagonal
lazarus / 39-Graphics

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Boleeman · 2024-07-13 02:05

A Lines Animation with Horizontal, Vertical, Diagonal Lines.

A bit hypnotic.

On a TBgraBmp and also on a TPaintbox.

Looking closely at the png's the Paintbox version has jaggies on the
diagonal lines.

I thought an extra effect would be to make the lines "Neon Glow" a bit
with the bgrabmp version.

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Boleeman · 2024-07-13 06:35

This produces Blurred lines/Glow type effect on bgraBmp but is
incredibly slow.

I love the effect of the intersection points of the lines.

Is there a better way to produce a similar effect, but make it faster
? I wonder ?

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circular · 2024-07-15 16:18

Yes, it is possible to make it faster using OpenGL. I suggest to begin
with to look at how to do some geometry and then blur:
opengltest0 shows how to draw a geometric shape.
opengltest4 shows how to apply blur to a texture.
opengltest5 shows how to use a framebuffer (see attached picture).

For the blur lines, the steps would be to create a framebuffer, draw
the lines in it, retrieve it as a texture, apply a blur to it and
display it.

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Boleeman · 2024-07-16 12:10

Thanks Circular for that advice. I will need to install Lazarus on
another laptop and the Dev branch of BgraBmp.

Much appreciated for your kind/wise hints on how to extend the
animation features.
I was also going to maybe go back to Josh's and DZandaa's animated
examples.

What I did also notice was that the screen shot of the program looks
different when I compiled on an Intel based laptop.
(with part of the image cut off), where as compiling to my AMD based
laptop produces the correct sized image.
Not exactly sure why?