javascript - How to transform (rotate) svg text element without changing coordinates?

Question

I'm new to this d3.js. Here I'm trying to draw a bar chart using the d3.v3.js library. Here I'm facing few problems. I have tried to include measure labels onto the y-axis. But once I transform the labels -90 degree its position is automatically changing.

Here's the code I'm used to drawing:

    svg.append("g")
    .attr("id","x_axis")
    .attr("class", "x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xAxis)
    .selectAll("text")  
    .style("text-anchor", "end")
    .attr("dx", "-.8em")
    .attr("dy", ".15em")
    .attr("transform", "rotate(-65)");
    // .attr("transform", "translate(" + bandSize + ", 0)")

    svg.append("g")
    .attr("class", "x axis")
    .attr("id","dimLabel")
    .append("text")
    .style("text-anchor", "end")
    .attr("x", width/2)
    .attr("y", height+55) 
    .text(dimensionLabels[0]);




    svg.append("g")
    .attr("id","y_axis1")
    .attr("class", "y axis")
    .call(yAxis)
    .append("text")
    .attr("class", "label")
    //.attr("transform", "rotate(-90)")
    .attr("y", function(d){return y(d3.max(data, function(d) { return d.Metric1; }));});


    //Measure Labels
    svg.append("g")
    .attr("class", "y axis")
    .attr("id","measureLabels")
    .append("text")
    .style("text-anchor", "end")
    .attr("x", 0)
    .attr("y", height/2) 
    .text(measureLabels[0]+", "+measureLabels[1])
    .attr("transform", "rotate(-90)");

Output Image:

Any help is greatly appreciated.

Answer 1

What you see right now is the expected result, because the rotate function of the transform attribute rotates the element around the origin (0,0), not around its center.

The easiest solution is dropping your attr("x") and attr("y") and positioning the text using the same transform:

var width = 300,
  height = 300;
var svg = d3.select("body")
  .append("svg")
  .attr("width", width)
  .attr("height", height);
var text = svg.append("text")
  .text("Sum (sales), Sum (quantity)")
  .attr("text-anchor", "middle")
  .attr("transform", "translate(20," + (height / 2) + ") rotate(-90)")

svg {
  border: 1px solid gray;
}

<script src="https://d3js.org/d3.v3.min.js"></script>