alpha
→ alpha()Reads how opaque a colour is — how much of what is behind it shows through.
alpha(colour)The name is left as it stands for the same reason PI is left as PI: alpha is notation, not vocabulary. It is a Greek letter used across all of computing for a colour’s opacity, and no written Setswana word for it exists in any source consulted.
The page explains the idea instead: alpha says how solid a colour is. A high alpha paints a solid colour; a low one makes it like glass, and what is behind shows through.
By default it returns a number from 0 to 255: a solid colour returns 255, and bopaMmala(0, 0, 0, 128) returns 128. Like the other components it follows the mode you are in.
Parameters
Section titled “Parameters”| Name | Type | Description |
|---|---|---|
mmala | mmala | The colour to read. |
Examples
Section titled “Examples”tiro setaLoeto() {
thalaKanefase(400, 200);
bokamorago(220);
tlogelaMothalo();
gopheta (diri i = 0; i < 5; i = i + 1) {
metlha mmala = bopaMmala(230, 60, 90, i * 50 + 55);
kwala(alpha(mmala));
tlatsaMmala(mmala);
thalaSediko(i * 78 + 44, 100, 90);
}
}