public void setBorder(float border) {
        setBorderLeft(border);
        setBorderTop(border);
        setBorderRight(border);
        setBorderBottom(border);
    }
@param col1 bottom left color
@param col2 bottom right color
@param col3 top right color
@param col4 top left color
core/src/com/ray3k/skincomposer/GradientDrawable.java