INFO 247 - Lab 7 - #2 - Color Scales

_.md

[ Launch: INFO 247 - Lab 7 - #1 - Draw Squares (full code) ] 5111589 by poezn
[ Launch: INFO 247 - Lab 6 - #1 ] 5054769 by poezn
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config.json

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inlet.js

// School of Information, UC Berkeley
// INFO 247 Lab 7: D3.js
// http://blogs.ischool.berkeley.edu/i247s13/lab-7-d3-js-part-2/ 

var start = 17;
var middle = 28;
var end = 39;
var legendSquareWidth = 32;

// YOUR TURN
// Experiment with the color scale

// this maps a start, middle, and end point to a color each
var colorScale = d3.scale.linear()
.domain([start, middle, end])
.range(['#F8696B', '#FCEA84', '#8dca7e']);

// draw big rectangle
g.append("rect")
.attr({
  "width": 150,
  "height": 150,
  "x": 350,
  "y": 330
})
.style({
  "fill": function(d, i) {
	return colorScale(28); // <== CHANGE THIS
  }
});






// This draws the legend
g.selectAll("rect.legend")
.data(d3.range(start, end))
.enter().append("rect")
.attr({
  "class": "legend",
  "width": legendSquareWidth - 2,
  "height": legendSquareWidth * 3,
  "transform": function(d, i) {
    var tx = 50 + legendSquareWidth * i;
    var ty = 50;
    return "translate(" + [tx, ty ] + ")";
  }
})
.style({
  "fill": function(d, i) {
    return colorScale(d);
  }
});

g.selectAll("text.legend")
.data(d3.range(start, end+1, 2))
.enter().append("text")
.attr({
  "class": "legend",
  "text-anchor": "middle",
  "transform": function(d, i) {
    var tx = 50 + 2 * legendSquareWidth * i;
    var ty = 176;
    return "translate(" + [tx, ty ] + ")";
  }
})
.style({
  "font-size": 15 + "px",
  "fill": "#383838"
})
.text(function(d, i) {
  return d;
});