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I have drawn my axes in d3 using the d3.extent method to determine the max and min values for the axis.

However, by default, d3 draws the y axis upside down (d3 bar chart is upside down) and I need to invert it.

How to I tell the extent method to invert the results?

I have drawn my axes in d3 using the d3.extent method to determine the max and min values for the axis.

However, by default, d3 draws the y axis upside down (d3 bar chart is upside down) and I need to invert it.

How to I tell the extent method to invert the results?

• javascript
• d3.js

Share Improve this question Follow edited May 23, 2017 at 12:00 CommunityBot 111 silver badge asked Aug 14, 2015 at 9:39 Neil PNeil P 3,21077 gold badges4141 silver badges7676 bronze badges 4

• show us what you have tried so far, ideally with some fiddle or similar – jarandaf Commented Aug 14, 2015 at 10:11
• I've managed to find a way to make it work, but was wondering if there was a single function to do it! – Neil P Commented Aug 14, 2015 at 10:22
• 2 Ok, now I understand... a one-liner: d3.time.scale().domain(d3.extent(data.History, function (d) { return d.ArrivalTime; }).reverse())... – jarandaf Commented Aug 14, 2015 at 10:25
• reverse! Makes perfect sense. Do you want to drop that into an answer so I can mark it? – Neil P Commented Aug 14, 2015 at 10:26

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2 Answers 2

Sorted by: Reset to default 8

You can use d3.extent function in bination with reverse:

var yScale = d3.time.scale()
               .domain(d3.extent(data.History, function (d) { return d.ArrivalTime; }).reverse())
               .range([margin.top, chartHeight - margin.top * 2]);

I've managed to do it manually using the following code. I can't find a neater way than this:

 var yMax = d3.max(data.History, function (d) { return d.ArrivalTime });
 var yMin = d3.min(data.History, function (d) { return d.ArrivalTime });

var yScale = d3.time.scale()
                .domain([yMax, yMin])
                .range([margin.top, chartHeight - margin.top * 2]);

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