Method setAlphaf

shared/java/Paint.java:273–276

Replaces alpha, leaving RGB unchanged. An out of range value triggers an assert in the debug build. a is a value from 0f to 1f. a set to zero makes color fully transparent; a set to 1.0 makes color fully opaque. @param a alpha component of color @return this

(float a)

     * @return   this
     */
    @NotNull @Contract("_ -> this")
    public Paint setAlphaf(float a) {
        return setColor4f(getColor4f().withA(a));
    }

    /**
     * <p>Replaces alpha, leaving RGB unchanged. An out of range value triggers