javascript - 具有对数轴刻度的HighCharts可拖动绘图线

我有一个使用HighCharts的简单折线图，并尝试在其中添加可拖动的绘图线。

$(function () {

function draggablePlotLine(axis, plotLineId) {
    var clickX, clickY;

    var getPlotLine = function () {
        for (var i = 0; i < axis.plotLinesAndBands.length; i++) {
            if (axis.plotLinesAndBands[i].id === plotLineId) {
                return axis.plotLinesAndBands[i];
            }
        }
    };

    var getValue = function() {
        var plotLine = getPlotLine();
        var translation = axis.horiz ? plotLine.svgElem.translateX : plotLine.svgElem.translateY;
        var new_value = axis.toValue(translation) - axis.toValue(0) + plotLine.options.value;
        new_value = Math.max(axis.min, Math.min(axis.max, new_value));
        return new_value;
    };

    var drag_start = function (e) {
        $(document).bind({
            'mousemove.line': drag_step,
                'mouseup.line': drag_stop
        });

        var plotLine = getPlotLine();
        clickX = e.pageX - plotLine.svgElem.translateX;
        clickY = e.pageY - plotLine.svgElem.translateY;
        if (plotLine.options.onDragStart) {
            plotLine.options.onDragStart(getValue());
        }
    };

    var drag_step = function (e) {
        var plotLine = getPlotLine();
        var new_translation = axis.horiz ? e.pageX - clickX : e.pageY - clickY;
        var new_value = axis.toValue(new_translation) - axis.toValue(0) + plotLine.options.value;
        new_value = Math.max(axis.min, Math.min(axis.max, new_value));
        new_translation = axis.toPixels(new_value + axis.toValue(0) - plotLine.options.value);
        plotLine.svgElem.translate(
            axis.horiz ? new_translation : 0,
            axis.horiz ? 0 : new_translation);

        if (plotLine.options.onDragChange) {
            plotLine.options.onDragChange(new_value);
        }
    };

    var drag_stop = function () {
        $(document).unbind('.line');

        var plotLine = getPlotLine();
        var plotLineOptions = plotLine.options;
        //Remove + Re-insert plot line
        //Otherwise it gets messed up when chart is resized
        if (plotLine.svgElem.hasOwnProperty('translateX')) {
            plotLineOptions.value = getValue()
            axis.removePlotLine(plotLineOptions.id);
            axis.addPlotLine(plotLineOptions);

            if (plotLineOptions.onDragFinish) {
                plotLineOptions.onDragFinish(plotLineOptions.value);
            }
        }

        getPlotLine().svgElem
            .css({'cursor': 'pointer'})
            .translate(0, 0)
            .on('mousedown', drag_start);
    };
    drag_stop();
};

$('#container').highcharts({
    xAxis: {

        min: -10,
        max: 10,
        plotLines: [{
            id: 'foo',
            color: '#00F',
            width: 4,
            value: 5,
            onDragStart: function (new_value) {
                $("#x_value").text(new_value + ' (Not changed yet)');
            },
            onDragChange: function (new_value) {
                $("#x_value").text(new_value + ' (Dragging)');
            },
            onDragFinish: function (new_value) {
                $("#x_value").text(new_value);
            }
        }]
    },

    yAxis: {
           type: 'logarithmic',
        plotLines: [{
            label: {
                text: 'Not draggable'
            },
            id: 'y1',
            color: '#CCC',
            width: 4,
            value: 150
        }, {
            id: 'y2',
            color: '#00F',
            width: 4,
            value: 200,
            onDragStart: function (new_value) {
                $("#y_value").text(new_value + ' (Not changed yet)');
            },
            onDragChange: function (new_value) {
                $("#y_value").text(new_value + ' (Dragging)');
            },
            onDragFinish: function (new_value) {
                $("#y_value").text(new_value);
            }
        }, {
            label: {
                text: 'Not draggable'
            },
            id: 'y3',
            color: '#CCC',
            width: 4,
            value: 250
        }]
    },

    series: [{
        data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
    }]
}, function (chart) {
    draggablePlotLine(chart.xAxis[0], 'foo');
    draggablePlotLine(chart.yAxis[0], 'y2');
    console.log('ready');
});
});

JSFiddle链接：http://jsfiddle.net/48awM/30/（实际）
我的分叉更新：http://jsfiddle.net/kk8322/z62nnmwe/1/

实际的JSFiddle可以正常工作-具有正常的轴比例，但是在拖动绘图线时分叉的版本将失败。实际版本和分叉版本之间的唯一区别是，我的Y轴将为“对数”类型。

   type: 'logarithmic'

为轴添加对数刻度不能正确处理拖放。请建议我如何使用对数x / y轴比例处理可拖动的绘图线。

最佳答案

有一种在拖放时移动线条的简单方法。在logarithmic类型轴上工作正常。

示例：http://jsfiddle.net/tret53sv/

$(function () {

    var line,
    clickX,
    clickY;

    var start = function (e) {

        $(document).bind({
            'mousemove.line': step,
                'mouseup.line': stop
        });

        clickY = e.pageY - line.translateY;
        //clickY = e.pageY - line.translateY; //uncomment if plotline should be also moved vertically
    }

    var step = function (e) {
        line.translate(e.pageX - clickX, e.pageY - clickY)
    }

    var stop = function () {
        $(document).unbind('.line');
    }

    $('#container').highcharts({
        xAxis: {
            categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
        },
        yAxis:{
        type:'logarithmic',
             plotLines: [{
                color: '#FF0000',
                width: 5,
                value: 100
            }]
        },

        series: [{
            data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
        }]
    }, function (chart) {

        line = chart.yAxis[0].plotLinesAndBands[0].svgElem.attr({
            stroke: 'yellow'
        })
            .css({
            'cursor': 'pointer'
        })
            .translate(0, 0)
            .on('mousedown', start);


    });





});

关于javascript - 具有对数轴刻度的HighCharts可拖动绘图线，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/36862453/