谷歌图表X轴看起来不那么好

Question

我使用谷歌图表API绘制图表.我得到这个图表:

我在这个图表中的问题是X轴.标签看起来不那么好.如果我在X轴上有更多的字符串,它看起来像这样:

我认为问题是因为X列类型是字符串而不是DATETIME.我如何更改谷歌图表中的列类型？或者我如何在不改变列类型的情况下更改X轴？我在下面添加脚本......

PHP代码:

$connection = mysql_connect('127.0.0.1','root','123456');
mysql_select_db('db_statmarket',$connection);

$result2 = mysql_query('select sum(`How much read from customer`) as Leads, Date from monitor group by Date;',$connection) or die('cannot show tables');

$json = array();
while($row = mysql_fetch_assoc($result2)) {
    $json[] = $row;
}

$str='[\'Date\', \'Leads\'],';
foreach($json as $key=>$value){

$str = $str.'['.'\''.$value["Date"].'\''.', '.$value["Leads"].'],'; 

}
$str = substr($str, 0, -1);
$str = '['.$str.']';
    $result1 = mysql_query('SELECT * FROM monitor ORDER BY customer_id DESC LIMIT 1;',$connection) or die('cannot show tables');
    $row = mysql_fetch_assoc($result1);

JS代码:

  google.setOnLoadCallback(drawChart);

  function drawChart() {

    var data = google.visualization.arrayToDataTable(<?php echo $str?>);

    var options = {
        title: '',
        curveType: 'function',
        legend: { position: 'bottom' },
        width: 1000,
        backgroundColor: '#efeff0',
        is3D: true,
        chartArea: {
        backgroundColor: {
                       stroke: '#efeff1',
                       strokeWidth: 1}},
        height: 300

    };

    var chart = new google.visualization.LineChart(document.getElementById('curve_chart'));

    chart.draw(data, options);

HTML代码:

<div id="curve_chart" class="plot" style="width: 50% ; height: 400px ; float:left; margin-left:9%;"></div>

谢谢!

Answer 1

我找到了答案.

我为所有人分享它.所以,如果有人像我一样卡住了.将继续快速提供此帮助.

我创建了新的变量: var showEvery = parseInt(data.getNumberOfRows() / 4);

在选项属性中我添加: hAxis: {showTextEvery: showEvery}

所以JS代码看起来像这样:

    var data = google.visualization.arrayToDataTable(<?php echo $str?>);

    var show = parseInt(data.getNumberOfRows() / 4);

    var options = {
        title: '',
        curveType: 'function',
        legend: { position: 'bottom' },
        width: 1000,
        backgroundColor: '#efeff0',
        is3D: true,
        chartArea: {
        backgroundColor: {
                       stroke: '#efeff1',
                       strokeWidth: 1}},
        hAxis: {showTextEvery: showEvery},
        height: 300
    };

    var chart = new google.visualization.LineChart(document.getElementById('curve_chart'));

    chart.draw(data, options);