http://idk.i2p/javadoc-i2p/org/rrd4j/graph/LegendComposer.html
RrdGraphConstants ALIGN_CENTER_MARKER , ALIGN_JUSTIFIED_MARKER , ALIGN_LEFT_MARKER , ALIGN_LEFTNONL_MARKER , ALIGN_RIGHT_MARKER , BLIND_COLOR , COLOR_ARROW , COLOR_BACK , COLOR_CANVAS , COLOR_FONT , COLOR_FRAME , COLOR_GRID , COLOR_MGRID , COLOR_SHADEA , COLOR_SHADEB , COLOR_XAXIS , COLOR_YAXIS , DAY , DEFAULT_ARROW_COLOR , DEFAULT_BACK_COLOR , DEFAULT_BASE , DEFAULT_CANVAS_COLOR , DEFAULT_END , DEFAULT_FONT_COLOR , DEFAULT_FRAME_COLOR , DEFAULT_GRID_COLOR , DEFAULT_HEIGHT ,...