From 2fbfb13871f9ec82a300da27f9348e49990b92cc Mon Sep 17 00:00:00 2001
From: Alexey Velikiy <gmpota@gmail.com>
Date: Sun, 26 Feb 2017 18:03:56 +0100
Subject: [PATCH] pie chart

---
 src/components/index.vue                      |  2 +-
 src/d3-components/bars-style-basic.vue        |  2 -
 .../pie-chart-local-component/index.vue       | 61 ++++++++++++
 .../pie-chart-local-component/pie.vue         | 92 +++++++++++++++++++
 src/router/demos.js                           | 13 ++-
 5 files changed, 164 insertions(+), 6 deletions(-)
 create mode 100644 src/d3-components/pie-chart-local-component/index.vue
 create mode 100644 src/d3-components/pie-chart-local-component/pie.vue

diff --git a/src/components/index.vue b/src/components/index.vue
index 1a2743e..6e00c43 100644
--- a/src/components/index.vue
+++ b/src/components/index.vue
@@ -29,7 +29,7 @@ ul {
   /*list-style-type: none;*/
   padding: 0;
   margin: auto;
-  width: 150px;
+  width: 300px;
 }
 
 li {
diff --git a/src/d3-components/bars-style-basic.vue b/src/d3-components/bars-style-basic.vue
index 7d352ae..7a5d9d2 100644
--- a/src/d3-components/bars-style-basic.vue
+++ b/src/d3-components/bars-style-basic.vue
@@ -26,8 +26,6 @@ export default {
       {name: 'three', val: 200}
     ]
 
-    console.log(this.$styles);
-
     var x = d3.scaleBand()
       .rangeRound([0, width]).padding(0.1)
       .domain(data.map(d => d.name));
diff --git a/src/d3-components/pie-chart-local-component/index.vue b/src/d3-components/pie-chart-local-component/index.vue
new file mode 100644
index 0000000..9987812
--- /dev/null
+++ b/src/d3-components/pie-chart-local-component/index.vue
@@ -0,0 +1,61 @@
+<!--
+
+Links:
+  Local Registration: https://vuejs.org/v2/guide/components.html#Local-Registration
+  Props: https://vuejs.org/v2/guide/components.html#Passing-Data-with-Props
+  Methods: https://vuejs.org/v2/guide/events.html#Method-Event-Handlers
+  Conditional Rendering: https://vuejs.org/v2/guide/conditional.html
+
+Data:
+  http://www.studentsoftheworld.info/penpals/stats.php3?Pays=
+
+-->
+
+<template>
+  <div>
+    <h3>Most popular female names in the world</h3>
+    <pie :data="names" />
+    <br>
+    <button v-if="canAddAName" v-on:click="addName">Add a name</button>
+  </div>
+</template>
+
+<script>
+
+var _ = require('lodash')
+const pie = require('d3-components/pie-chart-local-component/pie')
+
+const NAMES = [
+  { name: 'Sarah', value: 2502 },
+  { name: 'Emma', value: 2005 },
+  { name: 'Laura', value: 1968 },
+  { name: 'Chloé', value: 1863 },
+  { name: 'Marie', value: 1810 },
+  { name: 'Emily', value: 1637 },
+  { name: 'Léa', value: 1592 },
+  { name: 'Camille', value: 1572 },
+  { name: 'Anna', value: 1433 },
+  { name: 'Manon', value: 1403 }
+]
+
+export default {
+  components: {
+    pie: pie
+  },
+  data: function() {
+    return {
+      names: _.take(NAMES, 3)
+    }
+  },
+  computed: {
+    canAddAName: function() {
+      return this.names.length < NAMES.length;
+    }
+  },
+  methods: {
+    addName: function() {
+      this.names.push(NAMES[this.names.length]);
+    }
+  }
+}
+</script>
diff --git a/src/d3-components/pie-chart-local-component/pie.vue b/src/d3-components/pie-chart-local-component/pie.vue
new file mode 100644
index 0000000..8094d03
--- /dev/null
+++ b/src/d3-components/pie-chart-local-component/pie.vue
@@ -0,0 +1,92 @@
+<!--
+
+Based on:
+  https://bl.ocks.org/shimizu/f90651541575f348a129444003a73467
+
+Links:
+  Props: https://vuejs.org/v2/guide/components.html#Passing-Data-with-Props
+  Methods: https://vuejs.org/v2/guide/events.html#Method-Event-Handlers
+
+-->
+
+<template>
+  <svg width="500" height="300"></svg>
+</template>
+
+<script>
+
+const d3 = require('d3');
+
+export default {
+  mounted: function() {
+    var svg = d3.select(this.$el);
+    var width = +svg.attr('width');
+    var height = +svg.attr('height');
+
+    var margin = { top:20, left:0, bottom:30, right:0 };
+
+    var chartWidth = width - (margin.left + margin.right);
+    var chartHeight = height - (margin.top + margin.bottom);
+
+    this.chartLayer = svg
+      .append('g')
+      .attr(
+        "transform",
+        `translate(${margin.left}, ${margin.top})`
+      );
+
+    this.arc = d3.arc()
+      .outerRadius(chartHeight / 2)
+      .innerRadius(chartHeight / 4)
+      .padAngle(0.03)
+      .cornerRadius(8)
+
+    this.pieG = this.chartLayer
+      .append("g")
+      .attr(
+        "transform",
+        `translate(${chartWidth / 2}, ${chartHeight / 2})`
+      )
+
+    this.drawChart(this.data);
+
+  },
+  props: ['data'],
+  watch: {
+    data: function(newData) {
+      this.drawChart(newData);
+    }
+  },
+  methods: {
+    drawChart: function(data) {
+      var arcs = d3.pie()
+          .sort(null)
+          .value(function(d) { return d.value; })
+          (data)
+
+      var block = this.pieG.selectAll(".arc")
+        .data(arcs)
+
+      block.select('path').attr('d', this.arc)
+
+      var newBlock = block
+        .enter()
+        .append("g")
+        .classed("arc", true)
+
+      newBlock.append("path")
+        .attr("d", this.arc)
+        .attr("id", function(d, i) { return "arc-" + i })
+        .attr("stroke", "gray")
+        .attr("fill", d => d3.interpolateCool(Math.random()))
+
+      newBlock.append("text")
+        .attr("dx", 10)
+        .attr("dy", -5)
+        .append("textPath")
+        .attr("xlink:href", function(d, i) { return "#arc-" + i; })
+        .text(function(d) { return d.data.name })
+    }
+  }
+}
+</script>
diff --git a/src/router/demos.js b/src/router/demos.js
index ef3b1ec..cd492c2 100644
--- a/src/router/demos.js
+++ b/src/router/demos.js
@@ -2,12 +2,12 @@ const config = require('config.json');
 
 export const routes = [
   {
-    name: 'Circle mount',
+    name: 'Circle: mount',
     path: '/circle-mount',
     component: require('d3-components/circle-mount')
   },
   {
-    name: 'Size controller',
+    name: 'Circle: size controller',
     path: '/size-controller',
     component: require('d3-components/size-controller')
   },
@@ -20,12 +20,19 @@ export const routes = [
     name: 'Bars: styles scoped',
     path: '/bars-style-scoped',
     component: require('d3-components/bars-style-scoped')
+  },
+  {
+    name: 'Pie chart: local component & props',
+    path: '/pie-chart-local-component',
+    folder: true,
+    component: require('d3-components/pie-chart-local-component/index')
   }
 ].map(r => {
   var res = r;
   res.href = "#" + r.path;
   res.source = config.githubLink +
                config.d3ComponentsPath +
-               r.path + '.vue'
+               r.path +
+               (r.folder ? '' : '.vue')
   return res;
 })