update

2026-06-21 20:00:13 +02:00
parent 885c4811d0
commit 8ba4b94498
18 changed files with 537 additions and 1188 deletions
--- a/frontend/src/components/GraphView.vue
+++ b/frontend/src/components/GraphView.vue
@@ -0,0 +1,133 @@
+<script setup>
+import { ref, computed, watch, nextTick } from 'vue'
+import { VueFlow, useVueFlow, Handle, Position, MarkerType } from '@vue-flow/core'
+import '@vue-flow/core/dist/style.css'
+import dagre from '@dagrejs/dagre'
+import { renderMarkdownInline } from '../markdown.js'
+
+// Grafik = {knoten:[{id,text}], kanten:[{von,nach,text?}], richtung:'TB'|'LR'}.
+// KI liefert nur die Semantik; Layout macht dagre, Mathe rendert KaTeX im Knoten.
+const props = defineProps({
+  graph: { type: Object, default: null },
+  height: { type: String, default: '380px' },
+})
+
+let _seq = 0
+const flowId = `gv-${++_seq}-${Math.floor(performance.now())}`
+const { findNode, fitView, onNodesInitialized } = useVueFlow(flowId)
+
+const nodes = ref([])
+const edges = ref([])
+const bereit = ref(false)   // erst nach dem Layout sichtbar (sonst kurz bei 0,0 gestapelt)
+const fehler = ref(false)
+
+const richtung = computed(() => (props.graph?.richtung === 'LR' ? 'LR' : 'TB'))
+const istLR = computed(() => richtung.value === 'LR')
+const targetPos = computed(() => (istLR.value ? Position.Left : Position.Top))
+const sourcePos = computed(() => (istLR.value ? Position.Right : Position.Bottom))
+
+function build() {
+  bereit.value = false
+  const g = props.graph
+  const kn = g && Array.isArray(g.knoten) ? g.knoten : []
+  if (!kn.length) {
+    fehler.value = true
+    nodes.value = []
+    edges.value = []
+    return
+  }
+  fehler.value = false
+  const ids = new Set(kn.map((k) => String(k.id)))
+  nodes.value = kn.map((k) => ({
+    id: String(k.id),
+    type: 'math',
+    position: { x: 0, y: 0 },
+    data: { text: String(k.text || '') },
+  }))
+  edges.value = (g.kanten || [])
+    .filter((e) => ids.has(String(e.von)) && ids.has(String(e.nach)))
+    .map((e, i) => ({
+      id: `e${i}`,
+      source: String(e.von),
+      target: String(e.nach),
+      label: e.text ? String(e.text) : undefined,
+      type: 'smoothstep',
+      markerEnd: MarkerType.ArrowClosed,
+    }))
+}
+
+// Two-Pass: Vue Flow misst die Knoten (KaTeX!), erst dann rechnet dagre das Layout.
+function layout() {
+  const g = new dagre.graphlib.Graph()
+  g.setDefaultEdgeLabel(() => ({}))
+  g.setGraph({ rankdir: richtung.value, nodesep: 40, ranksep: 55 })
+  for (const n of nodes.value) {
+    const dim = findNode(n.id)?.dimensions
+    g.setNode(n.id, { width: dim?.width || 160, height: dim?.height || 40 })
+  }
+  for (const e of edges.value) g.setEdge(e.source, e.target)
+  dagre.layout(g)
+  nodes.value = nodes.value.map((n) => {
+    const p = g.node(n.id)
+    return { ...n, position: { x: p.x - p.width / 2, y: p.y - p.height / 2 } }
+  })
+}
+
+onNodesInitialized(async () => {
+  if (!nodes.value.length) return
+  await document.fonts.ready  // sonst misst der Browser Fallback-Font → falsche Breite
+  layout()
+  bereit.value = true
+  await nextTick()
+  fitView({ padding: 0.2 })
+})
+
+watch(() => props.graph, build, { immediate: true })
+</script>
+
+<template>
+  <div class="graph-view" :style="{ height }">
+    <p v-if="fehler" class="graph-fallback">Grafik nicht verfügbar — Bausteine ab „Grafiken" neu bauen.</p>
+    <VueFlow
+      v-else
+      :id="flowId"
+      :nodes="nodes"
+      :edges="edges"
+      :style="{ opacity: bereit ? 1 : 0 }"
+      :nodes-draggable="false"
+      :nodes-connectable="false"
+      :elements-selectable="false"
+      :zoom-on-scroll="false"
+      :zoom-on-double-click="false"
+      :min-zoom="0.2"
+      :max-zoom="2"
+      fit-view-on-init
+    >
+      <template #node-math="{ data }">
+        <Handle type="target" :position="targetPos" />
+        <div class="gv-node markdown" v-html="renderMarkdownInline(data.text)"></div>
+        <Handle type="source" :position="sourcePos" />
+      </template>
+    </VueFlow>
+  </div>
+</template>
+
+<style scoped>
+.graph-view { width: 100%; position: relative; }
+.graph-fallback { color: var(--text-muted); font-size: 0.85rem; padding: 1rem 0; }
+.gv-node {
+  padding: 0.4rem 0.65rem;
+  border: 1px solid var(--border-strong, #999);
+  border-radius: 8px;
+  background: var(--panel, #fff);
+  color: var(--text, #111);
+  font-size: 0.8rem;
+  line-height: 1.3;
+  text-align: center;
+  max-width: 240px;
+}
+/* KaTeX im Knoten nicht umbrechen lassen */
+.gv-node :deep(.katex) { white-space: nowrap; }
+.graph-view :deep(.vue-flow__edge-text) { font-size: 0.72rem; fill: var(--text-muted, #666); }
+.graph-view :deep(.vue-flow__edge-textbg) { fill: var(--panel, #fff); }
+</style>