From 18b62bd2b2d3c27bb02b35cf7484bea2d55b53c2 Mon Sep 17 00:00:00 2001
From: Vasek Sraier <git@vakabus.cz>
Date: Sun, 27 Sep 2020 01:06:44 +0200
Subject: [PATCH] nacitani uloh do grafu z tasks.json

---
 frontend/src/Graph.svelte   | 23 ++++++++++++----------
 frontend/src/task-loader.ts | 38 +++++++++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+), 10 deletions(-)

diff --git a/frontend/src/Graph.svelte b/frontend/src/Graph.svelte
index d02e5a9..344acf3 100644
--- a/frontend/src/Graph.svelte
+++ b/frontend/src/Graph.svelte
@@ -1,6 +1,7 @@
 <script type="ts">
   import { onMount } from "svelte";
   import * as d3 from "d3";
+  import *  as tasksLoader from "./task-loader";
 
   // Svelte automatically fills this with a reference
   let container: HTMLElement;
@@ -17,17 +18,18 @@
       .append("svg")
       .attr("width", width + margin.left + margin.right)
       .attr("height", height + margin.top + margin.bottom)
+      .attr("viewBox", [-width / 2, -height / 2, width, height])
       .append("g")
       .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
 
-    const data = await d3.json(
-      "https://raw.githubusercontent.com/holtzy/D3-graph-gallery/master/DATA/data_network.json"
-    );
+    const tasks =  await tasksLoader.loadTasks();
+    let nodes = tasks.tasks;
+    let edges = tasksLoader.createLinksFromTaskMap(tasks);
 
     // Initialize the links
     var link = svg
       .selectAll("line")
-      .data(data.links)
+      .data(edges)
       .enter()
       .append("line")
       .style("stroke", "#aaa");
@@ -35,7 +37,7 @@
     // Initialize the nodes
     var node = svg
       .selectAll("circle")
-      .data(data.nodes)
+      .data(nodes)
       .enter()
       .append("circle")
       .attr("r", 20)
@@ -43,7 +45,7 @@
 
     // Let's list the force we wanna apply on the network
     var simulation = d3
-      .forceSimulation(data.nodes) // Force algorithm is applied to data.nodes
+      .forceSimulation(nodes) // Force algorithm is applied to data.nodes
       .force(
         "link",
         d3
@@ -51,10 +53,11 @@
           .id(function (d) {
             return d.id;
           }) // This provide  the id of a node
-          .links(data.links) // and this the list of links
+          .links(edges) // and this the list of links
       )
       .force("charge", d3.forceManyBody().strength(-400)) // This adds repulsion between nodes. Play with the -400 for the repulsion strength
-      .force("center", d3.forceCenter(width / 2, height / 2)) // This force attracts nodes to the center of the svg area
+      .force('x', d3.forceX()) // attracts elements to the zero X coord
+      .force('y', d3.forceY()) // attracts elements to the zero Y coord
       .on("tick", ticked)
       .on("end", ticked);
 
@@ -87,8 +90,8 @@
 
 <style>
   div {
-    height: 80vh;
-    width: 80vh;
+    height: 75vh;
+    width: 100%;
   }
 </style>
 
diff --git a/frontend/src/task-loader.ts b/frontend/src/task-loader.ts
index 1ed9ae0..2c00f02 100644
--- a/frontend/src/task-loader.ts
+++ b/frontend/src/task-loader.ts
@@ -10,7 +10,45 @@ export type TasksFile = {
     clusters: { [name: string]: string[] }
 }
 
+export type TaskMap = Map<string, TaskDescriptor>;
+
+export type Link<T> = {
+    source: T,
+    target: T
+}
+
 export async function loadTasks(): Promise<TasksFile> {
     const r = await fetch("/tasks.json")
     return await r.json()
 }
+
+export function createTaskMap(tasks: TasksFile): TaskMap {
+    let m = new Map<string, TaskDescriptor>();
+
+    for (let task of tasks.tasks) {
+        if (task.id in m) throw 'duplicate IDs in tasks.json';
+
+        m.set(task.id, task);
+    }
+
+    return m;
+}
+
+export function createLinksFromTaskMap(tasks: TasksFile): Link<TaskDescriptor>[] {
+    let links: Link<TaskDescriptor>[] = [];
+
+    const taskMap = createTaskMap(tasks);
+
+    for (const task of tasks.tasks) {
+        for (const id of task.requires) {
+            const t = taskMap.get(id);
+
+            if (t === undefined) throw `missing task with id ${id}`;
+
+            const l: Link<TaskDescriptor> = {source: t, target: task};
+            links.push(l);
+        }
+    }
+
+    return links;
+}