From 427ea184f2875ffeb49b3e90a5c83e4632c6aa09 Mon Sep 17 00:00:00 2001
From: Vasek Sraier <git@vakabus.cz>
Date: Sun, 27 Sep 2020 13:39:35 +0200
Subject: [PATCH] graf: i hrany uz jsou ciste Svelte

---
 frontend/public/grafik.html   |  2 +-
 frontend/src/Graph.svelte     | 37 +++++-----------------------
 frontend/src/GraphEdge.svelte | 17 +++++++++++++
 frontend/src/GraphNode.svelte | 46 +++++++++++++++++++++++++++--------
 4 files changed, 60 insertions(+), 42 deletions(-)
 create mode 100644 frontend/src/GraphEdge.svelte

diff --git a/frontend/public/grafik.html b/frontend/public/grafik.html
index 33954f8..5a61ab5 100644
--- a/frontend/public/grafik.html
+++ b/frontend/public/grafik.html
@@ -4,7 +4,7 @@
 	<meta charset='utf-8'>
 	<meta name='viewport' content='width=device-width,initial-scale=1'>
 
-	<title>Svelte app</title>
+	<title>Graulohík</title>
 
 	<link rel='icon' type='image/png' href='/favicon.png'>
 	<link rel='stylesheet' href='/global.css'>
diff --git a/frontend/src/Graph.svelte b/frontend/src/Graph.svelte
index b3fae06..6876804 100644
--- a/frontend/src/Graph.svelte
+++ b/frontend/src/Graph.svelte
@@ -1,5 +1,6 @@
 <script type="ts">
   import GraphNode from "./GraphNode.svelte";
+  import GraphEdge from "./GraphEdge.svelte";
   import { onMount } from "svelte";
   import * as d3 from "d3";
   import { createLinksFromTaskMap } from "./task-loader";
@@ -28,22 +29,6 @@
       .select("g")
       .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
 
-    // Initialize the links
-    var link = svg
-      .selectAll("line")
-      .data(edges)
-      .enter()
-      .append("line")
-      .style("stroke", "#aaa");
-
-    /*var node = svg
-      .selectAll("g")
-      .data(nodes)
-      .enter()
-      .append("circle")
-      .attr("r", 20)
-      .style("fill", "#69b3a2");*/
-
     // Let's list the force we wanna apply on the network
     var simulation = d3
       .forceSimulation(nodes) // Force algorithm is applied to data.nodes
@@ -56,7 +41,7 @@
           }) // This provide  the id of a node
           .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("charge", d3.forceManyBody().strength(-500)) // This adds repulsion between nodes. Play with the -400 for the repulsion strength
       .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)
@@ -64,20 +49,7 @@
 
     // This function is run at each iteration of the force algorithm, updating the nodes position.
     function ticked() {
-      link
-        .attr("x1", function (d) {
-          return d.source.x;
-        })
-        .attr("y1", function (d) {
-          return d.source.y;
-        })
-        .attr("x2", function (d) {
-          return d.target.x;
-        })
-        .attr("y2", function (d) {
-          return d.target.y;
-        });
-
+      edges = edges;
       nodes = nodes;
     }
   });
@@ -93,6 +65,9 @@
 <div bind:this={container}>
   <svg>
     <g>
+      {#each edges as edge}
+         <GraphEdge {edge} />
+      {/each}
       {#each nodes as task}
         <GraphNode {task} />
       {/each}
diff --git a/frontend/src/GraphEdge.svelte b/frontend/src/GraphEdge.svelte
new file mode 100644
index 0000000..3d6daa1
--- /dev/null
+++ b/frontend/src/GraphEdge.svelte
@@ -0,0 +1,17 @@
+<script lang="ts">
+    import type { SimulationLinkDatum } from "d3";
+
+    import { onMount } from "svelte";
+  
+    import type { TaskDescriptor } from "./task-loader";
+  
+    export let edge: SimulationLinkDatum<TaskDescriptor>;
+  
+    $: x1 = edge === undefined || edge.source === undefined || edge.source.x === undefined ? 0 : edge.source.x;
+    $: y1 = edge === undefined || edge.source === undefined || edge.source.y === undefined ? 0 : edge.source.y;
+    $: x2 = edge === undefined || edge.target === undefined || edge.target.x === undefined ? 0 : edge.target.x;
+    $: y2 = edge === undefined || edge.target === undefined || edge.target.y === undefined ? 0 : edge.target.y;
+</script>
+  
+ <line {x1} {x2} {y1} {y2} style="stroke: #aaa" />
+  
\ No newline at end of file
diff --git a/frontend/src/GraphNode.svelte b/frontend/src/GraphNode.svelte
index 2f205cb..2939407 100644
--- a/frontend/src/GraphNode.svelte
+++ b/frontend/src/GraphNode.svelte
@@ -1,18 +1,44 @@
 <script lang="ts">
+  import { onMount } from "svelte";
+
   import type { TaskDescriptor } from "./task-loader";
-  import Hoverable from "./Hoverable.svelte";
 
   export let task: TaskDescriptor;
+  let hovering: boolean = false;
+  let text_element: SVGTextElement;
+
+  $: cx = task === undefined || task.x === undefined ? 0 : task.x;
+  $: cy = task === undefined || task.y === undefined ? 0 : task.y;
+
+  function enter() {
+    hovering = true;
+  }
+
+  function leave() {
+    hovering = false;
+  }
 
-  $: cx = task === undefined || task.x === undefined ? 0 : task.x + 6;
-  $: cy = task === undefined || task.y === undefined ? 0 : task.y - 6;
+  let ellipse_rx = 20;
+  let ellipse_ry = 20;
+  onMount(() => {
+    const bbox = text_element.getBBox();
+    ellipse_rx = bbox.width / 2 + 8;
+    ellipse_ry = bbox.height / 2 + 8;
+  });
 </script>
 
-<Hoverable let:hovering={focused}>
-  {#if !focused}
-    <circle r="20" style="fill: #69b3a2" {cx} {cy} />
+<g on:mouseenter={enter} on:mouseleave={leave}>
+  {#if !hovering}
+    <ellipse rx={ellipse_rx} ry={ellipse_ry} style="fill: #69b3a2" {cx} {cy} />
   {:else}
-    <circle r="20" style="fill: #ffb3a2" {cx} {cy} />
-  {/if} -->
-  <text x={cx} y={cy}>{task.id}</text>
-</Hoverable>
+    <ellipse rx={ellipse_rx} ry={ellipse_ry} style="fill: #ffb3a2" {cx} {cy} />
+  {/if}
+  <text
+    bind:this={text_element}
+    x={cx}
+    y={cy + 5}
+    text-anchor="middle"
+    alignment-baseline="middle">
+    {task.id}
+  </text>
+</g>