How to set Google Charts legend width in JavaScript?

Here are some samples based on the google code playground line charts. Adjusting the chartArea width option gives more space for labels:

new google.visualization.LineChart(document.getElementById('visualization')).
    draw(data, {curveType: "function",
                width: 500, height: 400,
                vAxis: {maxValue: 10},
                chartArea: {width: '50%'}}
        );

If it’s an option, you could also position the labels beneath the chart, which gives considerably more space:

new google.visualization.LineChart(document.getElementById('visualization')).
    draw(data, {curveType: "function",
                width: 500, height: 400,
                vAxis: {maxValue: 10},
                legend: 'bottom'}
        );