java - Closing up blank space in JFreeChart bar chart -

i using jfreechart , display bar chart of player's scores, score on y-axis , player's games grouped on x-axis.

e.g.

string[] {player name, score, game number} player 1, 10 , 1 player 1, 12 , 2 player 1, 15 , 3 player 2, 11 , 1 player 3, 18 , 1 

because players not have play same number of games, results in lot of blank space when dataset created, tries plot bar player 2 & 3 games 2 & 3.

data.addvalue(score, game number, player name); 

output: (the numbers dont quite match, quick test knocked up)

can me how close blank space? in theory player 1 go on play 100s of games player 2 , 3 playing few, quite ridiculous! new jfreechart there obvious solution!

thank in advance help.

first @ picture

here explanation w.r.t numbers.

1. setlowermargin(double margin).
2. setuppermargin(double margin).
3. setcategorymargin(double margin).
4. setitemmargin(double margin).

here how can use methods in chart

 categoryplot p = chart.getcategoryplot();    categoryaxis axis = p.getdomainaxis();  axis.setlowermargin(0.1);  axis.setuppermargin(0.1);  axis.setcategorymargin(0.1);  barrenderer renderer = (barrenderer) p.getrenderer();  renderer.setitemmargin(0.1);  

you can set value between 0.0 1.0 (example 0.1 means 10%)

hope helps

(update after comment) in case should use layered bar chart