如何获得D3.js轴的滴答和位置作为数组？ [英] How can I get the D3.js axis ticks and positions as an array?

问题描述

我通常在svg上放置我的轴刻度线：

I usually place my axis ticks on the svg using this:

d3.svg.axis().scale(xScale(width)).ticks(4)

可以得到这些tick值和它们的svg坐标所以我可以使用自定义轴外的svg使用 d3.svg.axis（）？

Is it possible to get these tick values and their svg coordinates so I can use a custom axis outside the svg using d3.svg.axis() ?

推荐答案

是的， xScale.ticks（4）应该给你实际的滴答点作为值，你可以通过你的 xScale 到X位置。您还可以在将轴应用到实际元素后，从生成的元素中拉回点滴点：

Yes, xScale.ticks(4) should give you the actual tick points as values, and you can pipe those back through your xScale to the the X position. You can also just pull the tick points back from the generated elements after you apply the axis to an actual element:

var svg = d3.select("svg");

var scale = d3.scale.linear()
    .range([20, 280])
    .domain([0, 100])

var axis = d3.svg.axis().scale(scale).orient("bottom").ticks(9);
// grab the "scale" used by the axis, call .ticks()
// passing the value we have for .ticks()
console.log("all the points", axis.scale().ticks(axis.ticks()[0]));
// note, we actually select 11 points not 9, "closest guess"

// paint the axis and then find its ticks
svg.call(axis).selectAll(".tick").each(function(data) {
  var tick = d3.select(this);
  // pull the transform data out of the tick
  var transform = d3.transform(tick.attr("transform")).translate;

  // passed in "data" is the value of the tick, transform[0] holds the X value
  console.log("each tick", data, transform);
});

jsbin

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