Sprite transparency - GameCreators Forum

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aldoro101

9

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Joined: 27th Apr 2014

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Posted: 25th Jul 2014 05:42

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How would I go about setting the transparency color for sprites? It would help if you could name which commands to use.

Man everybody got aids n' $h1t.

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WickedX

14

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Joined: 8th Feb 2009

Location: A Mile High

Posted: 25th Jul 2014 07:07 Edited at: 25th Jul 2014 07:39

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Hopefully, this commented snippet will help.

+ Code Snippet

` turn sync on and set rate to 60
sync on
sync rate 60

` turn backdrop on
backdrop on

` colorkey is black by default
` use set image colorkey red, green, blue - to use an other color as transparent
` set image colorkey 255, 255, 0

` load image - preserve pixel perfect quality
` if the image file type supports an alpha channel such as png or dds
` then the file will need to be saved with an alpha channel to work
` in this case colorkey is not relevent
load image "image.bmp", 1, 1

` create sprite and center it on screen
sprite 1, (screen width()-image width(1))/2, (screen height()-image height(1))/2, 1

` set sprite with backsave and transparency enabled
set sprite 1, 1, 1

do

   sync
loop

Edit:

Quote: "
` not required - creating a sprite or 3D object will set the backdrop automatically
backdrop on"

I take that back, it appears creating a sprite will not set the backdrop.

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MrValentine

AGK Backer

12

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Joined: 5th Dec 2010

Playing: FFVII

Posted: 25th Jul 2014 10:04

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SET SPRITE ALPHA SprNo, opacity/alpha value 0-255 [0 Invisible, 255 Solid]

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WickedX

14

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Joined: 8th Feb 2009

Location: A Mile High

Posted: 25th Jul 2014 21:33

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I must admit, I hardly ever use the sprite functions. Creating a 3D object will set the backdrop. Sprite’s will only set the backdrop when rendered. The Set Sprite function will prevent the sprite from setting the backdrop regardless of the backsave flag. Sprite transparency is on by default. If the image format is capable of saving with an alpha channel you must create the image with alpha transparency to work. If the image format does not support an alpha channel, then black will be the transparent color, unless you set it to a different color with Set Image Colorkey. So, if you’re using a bitmap image and want black to be transparent, it’s as simple as this-

+ Code Snippet

` turn sync on and set rate to 60
sync on
sync rate 60

` colorkey is black by default
` use set image colorkey red, green, blue - to use an other color as transparent
` set image colorkey 255, 255, 0

` load image - preserve pixel perfect quality
` if the image file type supports an alpha channel such as png or dds
` then the file will need to be saved with an alpha channel to work
` in this case colorkey is not relevent
load image "image.bmp", 1, 1

` create sprite and center it on screen
sprite 1, (screen width()-image width(1))/2, (screen height()-image height(1))/2, 1

do

   sync
loop

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