D3在缩放事件中获取轴值 [英] D3 get axis values on zoom event

问题描述

我有一个来自 d3可缩放区域的简单可缩放图表

它具有日期x轴，当用户缩放时，我想获取图表x轴绑定值.
例如，我像这样放大

It has date x-axis, when user zooms, i want to get chart x-axis bound values.
For example i zoomed like this,

我想获取x轴值(2015年5月23日和2015年5月31日)以满足我的内部需求吗?尝试过但没有成功

I would like to get x-axis values, 23-May-2015 and 31-May-2015 for my internal needs, is possible? Tried this but no success

function draw(){
            var e = d3.event;
            if(e){
                var tx = Math.min(0, Math.max(e.translate[0], width - width*e.scale));
                var ty = Math.min(0, Math.max(e.translate[1], height - height*e.scale));
                console.log(x.invert(e.translate[0]), x.invert(tx));
                zoom.translate([tx, ty]);
                g.attr('transform', [
                    'translate(' + [tx, ty] + ')',
                    'scale(' + e.scale + ')'
                ].join(' '));
                svg.call(zoom);
            }
            svg.select('g.x.axis').call(xAxis);
            svg.select('g.y.axis').call(yAxis);
            svg.select('path.area').attr('d', area);
            svg.select('path.line').attr('d', line_low);
            svg.select('path.line').attr('fill', 'blue').attr('stroke-width', 4).attr('d', minTempLimitLine);
            svg.select('path.line').attr('fill', 'red').attr('stroke-width', 4).attr('d', maxTempLimitLine);
        }

但是x.invert(e.translate[0])经常返回Sat Oct 04 2014 12:56:40 GMT+0600 (ALMT)，这是我数据中的第一个日期(按日期过滤)，我也不认为它与e.translate有关，因为它只有2个值，分别是x，y. br> 有什么想法吗?

But x.invert(e.translate[0]) constantly returns Sat Oct 04 2014 12:56:40 GMT+0600 (ALMT) which is first date in my data (filtered by date), also i don't think it's related to e.translate as it has only 2 values, for x, y.
Any ideas?

推荐答案

如果您遵循以下示例( http ://bl.ocks.org/mbostock/4015254 ):

If you are following the example (http://bl.ocks.org/mbostock/4015254):

然后在 draw()函数

x.domain()

将为您提供当前状态的x轴的最大/最小数组.

will give you the max/min array for x-axis, of the current state.

这篇关于D3在缩放事件中获取轴值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！