The alpha transparency value of the image.



Returns: Real


This variable is used to get or to set the alpha value for the sprite. Alpha is always calculated as a value between 0 and 1 where 0 is completely transparent and 1 is completely opaque. Please note that for changes in this variable to be visible, the instance should have either no draw event (and so GameMaker: Studio will default draw the sprite) or be drawn using one of the extended drawing functions like draw_self() or draw_sprite_ext().

NOTE: On the HTML5 platform, this variable is not clamped. Therefore if you have a value greater than one, it will "wrap" back to 0 again, giving flickering results. Likewise if you go below 0, the alpha will "wrap" back to 1. You can use the function clamp for this.


if image_alpha > 0 image_alpha -= 0.01;

The above code will slowly reduce the image_alpha until it reaches 0.

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