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Newcomers DBPro Corner / BOX with Alpha?

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Mr909
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Posted: 14th Nov 2012 01:16
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How is it done? Can it be done? Please tell me it can be done.
:\
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Virtual Nomad
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Posted: 14th Nov 2012 03:22 Edited at: 14th Nov 2012 03:27
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anything you do with box can ben grabbed via get image and turned into a sprite, complete with alpha.

if you want to box with alpha directly "on top" of something that's already on the screen, you'll have to, either, do the above to a separate bitmap or consider a routine involving memblocks.

you'll need to provide more detail of what you're wanting to do for more advice.

Virtual Nomad @ California, USA . DBPro V7.7
AMD Phenom™ X4 9750 Quad-Core @ 2.4 GHz . 8 GB PC2-6400 RAM
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Chris Tate
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Posted: 14th Nov 2012 03:26 Edited at: 14th Nov 2012 03:29
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Three words. Advanced 2 D.

DBPRO drawing commands are slow. The only one I use is Paste Sprite, the others are not good for serious use in demanding apps.

However, if speed does not matter, just use a transparent colour with the box command. Make sure you are running in 32bit display mode.

This snippet shows you four solutions that draw semi-transparent white. The last two require Matrix1's 32bit RGB function to get the alpha channel.



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Virtual Nomad
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Posted: 14th Nov 2012 03:41 Edited at: 14th Nov 2012 03:42
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ack, never knew:
Quote: "box 0,100,100,200,0x70FFFFFF,0x70FFFFFF,0x70FFFFFF,0x70FFFFFF"

was possible (not that i ever needed to know).

i'll have to learn those fancy color codes some day

Virtual Nomad @ California, USA . DBPro V7.7
AMD Phenom™ X4 9750 Quad-Core @ 2.4 GHz . 8 GB PC2-6400 RAM
ATI Radeon HD 3650 @ 512 MB . Vista Home Premium 64 Bit
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Phaelax
DBPro Master
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Posted: 14th Nov 2012 18:00
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The box command has 4 additional parameters, each being a color for the corner of a box. In this context, it will use the alpha value of the color.

And if you don't want to use the Matrix1 library, calculate the alpha this way:


"You're not going crazy. You're going sane in a crazy world!" ~Tick
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Chris Tate
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Posted: 15th Nov 2012 10:01
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Another two pence; if you want to know what 0xFFFFFFFF is all about; here is one of my articles based on it:



Basically after the 0x; each two characters represent one channel from alpha through red, green and blue; Or just red green and blue. Count from 0 to 15 (base 16 ); 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F; where FF is 255, and 0x80 is 128.

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nonZero
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Posted: 17th Nov 2012 09:55
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The code works and yet I don't recall DBP supporting ARGB for basic 2D drawing - not that it matters as I don't use DBP draw command since, as stated before, they're slow. Still, thanks for that Chris, it may come in handy knowing and I like to be up to date with DBP's features.

RP Functions Library v1.0

My signature has not been erased by a mod.
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Rudolpho
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Posted: 21st Nov 2012 21:26
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Quote: "And if you don't want to use the Matrix1 library, calculate the alpha this way"

Or this, which supposedly is a bit faster for intense use:



"Why do programmers get Halloween and Christmas mixed up?"
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Phaelax
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Posted: 21st Nov 2012 22:02
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I thought bit shifting might be faster, but I think some people tested it and couldn't see any different in performance.

"You're not going crazy. You're going sane in a crazy world!" ~Tick
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Rudolpho
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Posted: 21st Nov 2012 23:00
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Ah, I was not aware of that.


"Why do programmers get Halloween and Christmas mixed up?"
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