private String rgbaColorStr(Color c) {
        StringBuilder b = new StringBuilder("rgba(");
        double alphaPercent = c.getAlpha() / 255.0;
        b.append(c.getRed()).append(",").append(c.getGreen()).append(",")
                .append(c.getBlue());
        b.append(",").append(transformDP(alphaPercent));
        b.append(")");
        return b.toString();
    }
private String rgbaColorStr(Color c) {
        StringBuilder b = new StringBuilder("rgba(");
        double alphaPercent = c.getAlpha() / 255.0;
        b.append(c.getRed()).append(",").append(c.getGreen()).append(",")
                .append(c.getBlue());
        b.append(",").append(transformDP(alphaPercent));
        b.append(")");
        return b.toString();
    }
private String rgbaColorStr ( Color c ) { StringBuilder b = new StringBuilder ( "rgba(" ) ; double alphaPercent = c . getAlpha ( ) / 255.0 ; b . append ( c . getRed ( ) ) . append ( "," ) . append ( c . getGreen ( ) ) . append ( "," ) . append ( c . getBlue ( ) ) ; b . append ( "," ) . append ( transformDP ( alphaPercent ) ) ; b . append ( ")" ) ; return b . toString ( ) ; }
Returns a string representing the specified color in RGBA format.

@param c  the color ({@code null} not permitted).

@return The SVG RGBA color string.
Returns a string representing the specified color in RGBA format .