TheDcoder

Why Array as an parameter for _Color* functions?

27 posts in this topic

#1 ·  Posted (edited)

Hello, I am a little confused why most of the Functions in Color.au3 use arrays to get color values :huh:? I think its burden to create an array every time if you want something like a COLORREF value, Lets take _ColorSetCOLORREF as an example, I modified the function to take normal parameters instead of an array:

Func _ColorSetCOLORREF($iRed, $iGreen, $iBlue, Const $_iCurrentExtended = @extended)
    Local $aColor[3] = [$iRed, $iGreen, $iBlue] ; Replaced the array check with an array declaration
    Local $iColor = 0, $iColorI
    For $i = 2 To 0 Step -1
        $iColor = BitShift($iColor, -8)
        $iColorI = $aColor[$i]
        If $iColorI < 0 Or $iColorI > 255 Then Return SetError(2, $i, -1) ; invalid color value
        $iColor += $iColorI
    Next
    Return SetExtended($_iCurrentExtended, $iColor)
EndFunc   ;==>_ColorSetCOLORREF

It works fine & the array gets deleted when the function returns, so a Win-Win for me... Is there any special reason about accepting an array instead of individual parameters :huh:?

 

Thanks in Advance, TD :)

Edited by TheDcoder
Code correction
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I highly doubt that code works, as $aColor[2] should be 3.


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Updated: 04/09/2015

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It probably uses an array because an array only needs a single parameter instead of 3, makes the function easier to use.


If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
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@BrewManNH What about the extra array declaration? :P


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#6 ·  Posted (edited)

In some ways it makes sense to store the three components of a colour as an array, but that should probably be the programmer's choice. With an array you can't so easily tell that it is RGB.

Edited by czardas

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@BrewManNH What about the extra array declaration? :P

What about it?


If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
Give a programmer the correct code and he can do his work for a day. Teach a programmer to debug and he can do his work for a lifetime - by Chirag Gude
How to ask questions the smart way!

I hereby grant any person the right to use any code I post, that I am the original author of, on the autoitscript.com forums, unless I've specifically stated otherwise in the code or the thread post. If you do use my code all I ask, as a courtesy, is to make note of where you got it from.

Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays.  -  ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script.  -  Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label.  -  _FileGetProperty - Retrieve the properties of a file  -  SciTE Toolbar - A toolbar demo for use with the SciTE editor  -  GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI.  -   Latin Square password generator

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@BrewManNH We need to type an extra line for this:

$aColor[3] = [1, 2, 3]

TD :mellow:


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I understood what you meant, I don't get why you think it matters.


If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
Give a programmer the correct code and he can do his work for a day. Teach a programmer to debug and he can do his work for a lifetime - by Chirag Gude
How to ask questions the smart way!

I hereby grant any person the right to use any code I post, that I am the original author of, on the autoitscript.com forums, unless I've specifically stated otherwise in the code or the thread post. If you do use my code all I ask, as a courtesy, is to make note of where you got it from.

Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays.  -  ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script.  -  Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label.  -  _FileGetProperty - Retrieve the properties of a file  -  SciTE Toolbar - A toolbar demo for use with the SciTE editor  -  GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI.  -   Latin Square password generator

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I don't get why you think it matters.

Wastage of memory & an extra line :P


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Your code or the UDF?


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This whole topic isn't really making much sense to me. What is wrong with the UDF function? I don't see any real issue right this second.


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@guinness I think its an overkill to create an array to get the colorref color :-/


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#15 ·  Posted (edited)

But your memory assumption doesn't make sense to me. How do you conclude that?

Local $aArray = [1, 2, 3]

; OR

Local $iOne = 1, $iTwo = 2, $iThree = 3

; Same number of bytes to me.

 

Edited by guinness

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#16 ·  Posted (edited)

@TheDcoder The choice is for consistency with other colour functions. For example: _ColorGetRGB() returns an array which can be passed as a parameter to a variety of functions including _ColorSetCOLORREF(). While I acknowledge the simplicity of your suggestion, consistency counts for a lot, so I think the author of this UDF made a sensible choice in choosing an array.

Edited by czardas

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@czardas Oh :o

@guinness But the array gets deleted when the function returns :)


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But you have three variables still. I'm sorry, but I don't get your point in all this.


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#19 ·  Posted (edited)

If you need to get a BGR string from an RGB string, i have to think there is a one line regexp that can do that.

I think of this function as used with a palette anyway, where it is less mental gymnastics to keep one element static and iterate through the other two to get all the hues. 

Edited by boththose

,-. .--. ________ .-. .-. ,---. ,-. .-. .-. .-.
|(| / /\ \ |\ /| |__ __||| | | || .-' | |/ / \ \_/ )/
(_) / /__\ \ |(\ / | )| | | `-' | | `-. | | / __ \ (_)
| | | __ | (_)\/ | (_) | | .-. | | .-' | | \ |__| ) (
| | | | |)| | \ / | | | | | |)| | `--. | |) \ | |
`-' |_| (_) | |\/| | `-' /( (_)/( __.' |((_)-' /(_|
'-' '-' (__) (__) (_) (__)

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