wffweb/src/main/java/com/webfirmframework/wffweb/css/RgbaCssValue.java
public void setR(final int r) {
        if (r < 0 || r > 255) {
            throw new InvalidValueException(
                    "r paramater accept values only from 0 to 255.");
        }
        this.r = r;
        rgba = "rgba(" + r + ", " + g + ", " + b + ", " + a + ")";
        if (getStateChangeInformer() != null) {
            getStateChangeInformer().stateChanged(this);
        }
    }
public void setR(final int r) {
        if (r < 0 || r > 255) {
            throw new InvalidValueException(
                    "r paramater accept values only from 0 to 255.");
        }
        this.r = r;
        rgba = "rgba(" + r + ", " + g + ", " + b + ", " + a + ")";
        if (getStateChangeInformer() != null) {
            getStateChangeInformer().stateChanged(this);
        }
    }
to set the red value which is in between 0 to 255.

@param r
represents red
@author WFF
@since 1.0.0