<style>
.line {
  fill: none;
  stroke: steelblue;
  stroke-width: 1.5px;
}
.zoom {
  cursor: move;
  fill: none;
  pointer-events: all;
}
</style>

<h5 class="grey-text">Style</h5>

<% if analysis.sentence_count > 1 %>
<div class="row">
  <div class="col s12">
    <div class="card">
      <div class="card-content">
        <div class="card-title">Words per sentence</div>
        <div id="words-per-sentence" ></div>
      </div>
      <div class="card-action">
        <a class="activator blue-text text-darken-4">
          How to use this chart
        </a>
      </div>
      <div class="card-reveal">
        <span class="card-title">
          Words per sentence
          <i class="material-icons right">close</i>
        </span>
        <div class="row">
          <div class="col s12 m6 l4">
            <p>
              Sentence length can be a powerful tool in your writing and you should
              use it purposefully. Longer sentences can lure a reader in, while shorter,
              more stacatto sentences keep that attention with fast-paced action.
            </p>
            <p>
              This chart shows the length, in words, of each sentence through your
              document. Groups of shorter sentences likely read faster, while groups
              of longer sentences may be dense or hard to read.
            </p>
            <p>
              Selecting an area on the chart will zoom in to focus on just that area.
              Double-clicking the chart will reset the zoom back to your entire document.
            </p>
          </div>
          <div class="col s12 m6 l7 offset-l1">
            <blockquote style="font-size: 110%">
              <p>
                <span class="black-text red lighten-4">This sentence has five words.</span>
                <span class="black-text red lighten-4">Here are five more words.</span>
                <span class="black-text red lighten-4">Five-word sentences are fine.</span>
                <span class="black-text red lighten-4">But several together become monotonous.</span>
                <span class="black-text red lighten-4">Listen to what is happening.</span>
                <span class="black-text red lighten-4">The writing is getting boring.</span>
                <span class="black-text red lighten-4">The sound of it drones.</span>
                <span class="black-text red lighten-4">It’s like a stuck record.</span>
                <span class="black-text red lighten-4">The ear demands some variety.</span>
              </p>

              <p>
                <span class="black-text yellow lighten-4">Now listen.</span>
                <span class="black-text green lighten-4">I vary the sentence length, and I create music.</span>
                <span class="black-text yellow lighten-4">Music.</span>
                <span class="black-text blue lighten-4">The writing sings.</span>
                <span class="black-text green lighten-4">It has a pleasant rhythm, a lilt, a harmony.</span>
                <span class="black-text blue lighten-4">I use short sentences.</span>
                <span class="black-text green lighten-4">And I use sentences of medium length.</span>

                <span class="black-text purple lighten-4">And sometimes, when I am certain the reader is rested, I will engage him with a sentence of considerable length, 
                a sentence that burns with energy and builds with all the impetus of a crescendo, 
                the roll of the drums, the crash of the cymbals–sounds that say listen to this, it is important.</span>
              </p>

              <p>
                <span class="black-text green lighten-4">So write with a combination of short, medium, and long sentences.</span>
                <span class="black-text green lighten-4">Create a sound that pleases the reader's ear.</span>
                <span class="black-text blue lighten-4">Don't just write words.</span>
                <span class="black-text yellow lighten-4">Write music.</span>
              </p>

              <p class="right-align">
                &mdash; Gary Provost, <em>100 Ways to Improve Your Writing</em>
              </p>
            </blockquote>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>
<% end %>

<div class="row">
  <div class="col s12">
    <div class="card">
      <div class="card-content">
        <div class="card-title">Words per sentence baseline comparison</div>

        <%= 
          column_chart([
            ['This document',       (analysis.word_count.to_f / analysis.sentence_count).round],
            ['The Grapes of Wrath', 11],
            ['Hemingway',           12.5],
            ["Typical Writing",     16],
            ['The Great Gatsby',    17],
            ["Swann's Way",         36],
          ], colors: [Document.hex_color])
        %>
      </div>
    </div>
  </div>
</div>

<script type="text/javascript">
  $(document).ready(function () {
    var word_count_data = $.map(<%= analysis.words_per_sentence %>, function( val, i ) {
      return { sentence_index: i, value: val };
    });

    var margin = {top: 10, right: 0, bottom: 30, left: 80},
        width = 1100 - margin.left - margin.right,
        height = 400 - margin.top - margin.bottom;

    // append the svg object to the body of the page
    var svg = d3.select("#words-per-sentence")
      .append("svg")
        .attr("width", '100%')
        .attr("height", height)
        .attr('viewBox','0 0 ' + Math.min(width, height) + ' ' + Math.min(width, height + margin.bottom))
        .attr('preserveAspectRatio', 'xMinYMin')
      .append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

    // Add X axis --> it is a date format
    var x = d3.scaleLinear()
      .domain(d3.extent(word_count_data, function(d) { return d.sentence_index; }))
      .range([ 0, width ]);
    xAxis = svg.append("g")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));

    // Add Y axis
    var y = d3.scaleLinear()
      .domain([0, d3.max(word_count_data, function(d) { return +d.value; })])
      .range([ height, 0 ]);
    yAxis = svg.append("g")
      .call(d3.axisLeft(y));

    // Add a clipPath: everything out of this area won't be drawn.
    var clip = svg.append("defs").append("svg:clipPath")
        .attr("id", "clip")
        .append("svg:rect")
        .attr("width", width )
        .attr("height", height )
        .attr("x", 0)
        .attr("y", 0);

    // Add brushing
    var brush = d3.brushX()                   // Add the brush feature using the d3.brush function
        .extent( [ [0,0], [width,height] ] )  // initialise the brush area: start at 0,0 and finishes at width,height: it means I select the whole graph area
        .on("end", updateChart)               // Each time the brush selection changes, trigger the 'updateChart' function

    // Create the line variable: where both the line and the brush take place
    var line = svg.append('g')
      .attr("clip-path", "url(#clip)")

    // Add the line
    line.append("path")
      .datum(word_count_data)
      .attr("class", "line")  // I add the class line to be able to modify this line later on.
      .attr("fill", "none")
      .attr("stroke", "steelblue")
      .attr("stroke-width", 1.5)
      .attr("d", d3.line()
        .x(function(d) { return x(d.sentence_index) })
        .y(function(d) { return y(d.value) })
        )

    // Add the brushing
    line
      .append("g")
        .attr("class", "brush")
        .call(brush);

    // A function that set idleTimeOut to null
    var idleTimeout
    function idled() { idleTimeout = null; }

    // A function that update the chart for given boundaries
    function updateChart() {

      // What are the selected boundaries?
      extent = d3.event.selection

      // If no selection, back to initial coordinate. Otherwise, update X axis domain
      if(!extent){
        if (!idleTimeout) return idleTimeout = setTimeout(idled, 350); // This allows to wait a little bit
        x.domain([ 4,8])
      }else{
        x.domain([ x.invert(extent[0]), x.invert(extent[1]) ])
        line.select(".brush").call(brush.move, null) // This remove the grey brush area as soon as the selection has been done
      }

      // Update axis and line position
      xAxis.transition().duration(1000).call(d3.axisBottom(x))
      line
          .select('.line')
          .transition()
          .duration(1000)
          .attr("d", d3.line()
            .x(function(d) { return x(d.sentence_index) })
            .y(function(d) { return y(d.value) })
          )
    }

    // If user double click, reinitialize the chart
    svg.on("dblclick",function(){
      x.domain(d3.extent(word_count_data, function(d) { return d.sentence_index; }))
      xAxis.transition().call(d3.axisBottom(x))
      line
        .select('.line')
        .transition()
        .attr("d", d3.line()
          .x(function(d) { return x(d.sentence_index) })
          .y(function(d) { return y(d.value) })
      )
    });
  });
</script>
