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[Malasieno]

Hello everyone,

perhaps i am too tired now to see the solution, but how can i change opacity in a frame, inside a sprite?
I mean... in sprite editor there is a parameter that controls frame opacity from 0 to 255, is there a script way to change this?

bye.

[Mnemonic]

To programatically set opacity of an individual sprite frame you have to query the frame object and set its AlphaColor property. Something like this:

Code: [Select]

var SomeFrame = SomeSprite.GetFrame(10);
SomeFrame.AlphaColor = MakeRGBA(255, 255, 255, 128);

This will set the alpha value of the 11th frame to 128.

[greg]

Hi All,

Is a sprite's alpha channel independent of its AlphaColor?  After reading through the documentation and forum, my understanding is as follows:

1. The alpha channel is a greyscale mask placed over an image that determines the transparency of various parts of the image.  (Black on the mask corresponds to an opaque part of the image, whereas white corresponds to a completely transparent part of the image.  Intermediate values--namely, greys--correspond to a partially transparent parts of the image.)

2. The AlphaColor determines the transparency of the entire image.  For example,

SomeFrame.AlphaColor = MakeRGBA(255, 255, 255, 0);    // fully transparent
SomeFrame.AlphaColor = MakeRGBA(255, 255, 255, 128); // partially transparent
SomeFrame.AlphaColor = MakeRGBA(255, 255, 255, 255); // fully opaque

Is this accurate?  In setting the AlphaColor with MakeRGBA(red_value, green_value, blue_value, alpha_value), would {red,green,blue}_value ever be set to a non-255 value?  If so, how would this affect the image?

Thanks so much for your help!

Greg

[Mnemonic]

Yes, that's right. The alpha channel is stored in the image and affects individual pixels. WME's AlphaColor attribute affects the entire game object (entity, actor, window..). Note that alpha channel transparency and AlphaColor transparency are combined.

In setting the AlphaColor with MakeRGBA(red_value, green_value, blue_value, alpha_value), would {red,green,blue}_value ever be set to a non-255 value?  If so, how would this affect the image?

Those three RGB values affect the color tint of the image. RGB(255, 255, 255) is white (i.e. no change). If you used, for example, (0, 0, 255), your sprite would get bluish tint.