谷歌图表离散轴显示线？

Question

我正在使用具有离散值的谷歌图表,似乎无法绘制vAxis线(黑色).

它出现在连续值中的图形但我不希望图表以这种方式间隔开.

这是两种类型的图表.

http://jsfiddle.net/cFHJY/

google.load("visualization", "1", {packages: ["corechart"]});
google.setOnLoadCallback(drawChart);

function drawChart() {
    var discreteData = new google.visualization.DataTable();
    discreteData.addColumn('string', 'Number');
    discreteData.addColumn('number', 'Value');

    discreteData.addRows([
        ['1.492', 10],
        ['30.701', 17],
        ['127.469', 6],
        ['749.382', 11]
    ]);

    var discreteChart = new google.visualization.ColumnChart(document.getElementById('discrete_chart_div'));
    discreteChart.draw(discreteData, {
        title: 'Discrete Axis Line Chart'
    });

    var continuousData = new google.visualization.DataTable();
    continuousData.addColumn('number', 'Number');
    continuousData.addColumn('number', 'Value');

    continuousData.addRows([
        [1.492, 10],
        [30.701, 17],
        [127.469, 6],
        [749.382, 11]
    ]);

    var continuousChart = new google.visualization.ColumnChart(document.getElementById('continuous_chart_div'));
    continuousChart.draw(continuousData, {
        title: 'Continuous Axis Line Chart'
    });
}

如何绘制vAxis线？

Answer 1

"vAxis线"实际上是hAxis基线,仅适用于连续轴.有点hackery,您可以将数据放在一个连续的轴上,同时保持其独立性.使用DataView将数据转换为"数字"类型(使用值的行索引和字符串值作为格式化值)并hAxis.ticks从视图中的值/格式化值对构建选项:

function drawChart() {
    var discreteData = new google.visualization.DataTable();
    discreteData.addColumn('string', 'Number');
    discreteData.addColumn('number', 'Value');

    discreteData.addRows([
        ['1.492', 10],
        ['30.701', 17],
        ['127.469', 6],
        ['749.382', 11]
    ]);

    var view = new google.visualization.DataView(discreteData);
    view.setColumns([{
        type: 'number',
        label: discreteData.getColumnLabel(0),
        calc: function (dt, row) {
            return {v: row + 1, f: dt.getFormattedValue(row, 0)};
        }
    }, 1]);

    var ticks = [];
    for (var i = 0; i < view.getNumberOfRows(); i++) {
        ticks.push({v: view.getValue(i, 0), f: view.getFormattedValue(i, 0)});
    }

    var range = view.getColumnRange(0);
    var offset = 0.5; // change this to move the left/right margins of the chart

    var discreteChart = new google.visualization.ColumnChart(document.getElementById('discrete_chart_div'));
    discreteChart.draw(view, {
        title: 'Discrete Axis Line Chart',
        hAxis: {
            ticks: ticks,
            viewWindow: {
                min: range.min - offset,
                max: range.max + offset
            },
            // set gridlines.color to "transparent" to hide the vertical gridlines
            /*
            gridlines: {
                color: 'transparent'
            }
            */
        }
    });
}
google.load('visualization', '1', {packages:['corechart'], callback: drawChart});

例如:http://jsfiddle.net/asgallant/h4Kfd/