Help with margins and spacing on horizontal graph

[agrikk]

I have a scorekeeping application that I am attempting to add a horizontal graph to but I am having problems getting the spacing right so that the text doesn't overlap the horizontal bar:

As you can see, using a wide left marking to try to accommodate negative scores ends up with the names pushed off the chart for a game with positive numbers.

I'm sure there I can set it so that the margin is set based on the minimum score if it is negative, or a default value if all of the scores are positive, but I'm not quite sure how to go about it.

[agrikk]

Another version where there is a large delta between the top score and a negative score forces the player names out of the graph area.

[agrikk]

I solved this by catching various cases:

// I first set the margin when all scores are positive

$margin=10;

// I calculate the width between the top score and the bottom score to use in calulating the margins in the cases below

if ( abs(max($datay))+abs(min($datay)) == 0 ) {

$spreadRatio = 0;

} else {

$spreadRatio = abs(min($datay))/(abs(max($datay))+abs(min($datay)));

}

// if the maximum score is positive and the minimum score is negative then apply a combination of the chart width times the chart gap between top score and bottom score

if (min($datay)<0) {

$margin=$spreadRatio * ($width-$left-$right)+10;

}

// if all scores are negative then margin is just the space to the left of the chart

if (max($datay)<0) {

$margin=($width-$left-$right)+10;

}