Merge branch 'develop' of https://github.com/mermaid-js/mermaid into develop

* 'develop' of https://github.com/mermaid-js/mermaid:
  Fix flowchart-elk render test
  chore: Add example page link in index
  fix: ELK diagram remove re-parsing
  Added linting
  fixed title bounds calculation, removed extra title from merging issues
  Centered Title function and changed rendering order for Elk flowchart to find Boundingbox
  Fixed styling for lines for ELK flowchart

cypress/integration/rendering/flowchart-elk.spec.js

@@ -844,3 +844,42 @@ end
     });
   });
 });
+
+describe('Title and arrow styling #4813', () => {
+  it('should render a flowchart with title', () => {
+    const titleString = 'Test Title';
+    renderGraph(
+      `---
+      title: ${titleString}
+      ---
+      flowchart LR
+      A-->B
+      A-->C`,
+      { flowchart: { defaultRenderer: 'elk' } }
+    );
+    cy.get('svg').should((svg) => {
+      const title = svg[0].querySelector('text');
+      expect(title.textContent).to.contain(titleString);
+    });
+  });
+
+  it('Render with stylized arrows', () => {
+    renderGraph(
+      `
+      flowchart LR
+      A-->B
+      B-.-oC
+      C==xD
+      D ~~~ A`,
+      { flowchart: { defaultRenderer: 'elk' } }
+    );
+    cy.get('svg').should((svg) => {
+      const edges = svg[0].querySelectorAll('.edges path');
+      console.log(edges);
+      expect(edges[0]).to.have.attr('pattern', 'solid');
+      expect(edges[1]).to.have.attr('pattern', 'dotted');
+      expect(edges[2]).to.have.css('stroke-width', '3.5px');
+      expect(edges[3]).to.have.css('stroke-width', '1.5px');
+    });
+  });
+});

packages/mermaid-flowchart-elk/src/diagram-definition.ts

@@ -1,6 +1,6 @@
 // @ts-ignore: JISON typing missing
 import parser from '../../mermaid/src/diagrams/flowchart/parser/flow.jison';
-import * as db from '../../mermaid/src/diagrams/flowchart/flowDb.js';
+import db from '../../mermaid/src/diagrams/flowchart/flowDb.js';
 import styles from '../../mermaid/src/diagrams/flowchart/styles.js';
 import renderer from './flowRenderer-elk.js';
 

packages/mermaid-flowchart-elk/src/flowRenderer-elk.js

@@ -6,6 +6,7 @@ import { findCommonAncestor } from './render-utils.js';
 import { labelHelper } from '../../mermaid/src/dagre-wrapper/shapes/util.js';
 import { getConfig } from '../../mermaid/src/config.js';
 import { log } from '../../mermaid/src/logger.js';
+import utils from '../../mermaid/src/utils.js';
 import { setupGraphViewbox } from '../../mermaid/src/setupGraphViewbox.js';
 import common from '../../mermaid/src/diagrams/common/common.js';
 import { interpolateToCurve, getStylesFromArray } from '../../mermaid/src/utils.js';
@@ -655,6 +656,11 @@ const insertEdge = function (edgesEl, edge, edgeData, diagObj, parentLookupDb, i
     .attr('d', curve(points))
     .attr('class', 'path ' + edgeData.classes)
     .attr('fill', 'none');
+  Object.entries(edgeData).forEach(([key, value]) => {
+    if (key !== 'classes') {
+      edgePath.attr(key, value);
+    }
+  });
   const edgeG = edgesEl.insert('g').attr('class', 'edgeLabel');
   const edgeWithLabel = select(edgeG.node().appendChild(edge.labelEl));
   const box = edgeWithLabel.node().firstChild.getBoundingClientRect();
@@ -702,21 +708,15 @@ const insertChildren = (nodeArray, parentLookupDb) => {
  */
 
 export const draw = async function (text, id, _version, diagObj) {
-  // Add temporary render element
+  const { securityLevel, flowchart: conf } = getConfig();
-  diagObj.db.clear();
   nodeDb = {};
   portPos = {};
-  diagObj.db.setGen('gen-2');
-  // Parse the graph definition
-  diagObj.parser.parse(text);
-
   const renderEl = select('body').append('div').attr('style', 'height:400px').attr('id', 'cy');
   let graph = {
     id: 'root',
     layoutOptions: {
       'elk.hierarchyHandling': 'INCLUDE_CHILDREN',
-      'org.eclipse.elk.padding': '[top=100, left=100, bottom=110, right=110]',
+      'elk.layered.spacing.edgeNodeBetweenLayers': conf?.nodeSpacing ? `${conf.nodeSpacing}` : '30',
-      'elk.layered.spacing.edgeNodeBetweenLayers': '30',
       // 'elk.layered.mergeEdges': 'true',
       'elk.direction': 'DOWN',
       // 'elk.ports.sameLayerEdges': true,
@@ -744,7 +744,6 @@ export const draw = async function (text, id, _version, diagObj) {
       graph.layoutOptions['elk.direction'] = 'LEFT';
       break;
   }
-  const { securityLevel, flowchart: conf } = getConfig();
 
   // Find the root dom node to ne used in rendering
   // Handle root and document for when rendering in sandbox mode
@@ -759,7 +758,6 @@ export const draw = async function (text, id, _version, diagObj) {
   const doc = securityLevel === 'sandbox' ? sandboxElement.nodes()[0].contentDocument : document;
 
   const svg = root.select(`[id="${id}"]`);
-
   // Define the supported markers for the diagram
   const markers = ['point', 'circle', 'cross'];
 
@@ -841,6 +839,7 @@ export const draw = async function (text, id, _version, diagObj) {
   log.info('after layout', JSON.stringify(graph, null, 2));
   const g = await elk.layout(graph);
   drawNodes(0, 0, g.children, svg, subGraphsEl, diagObj, 0);
+  utils.insertTitle(svg, 'flowchartTitleText', conf.titleTopMargin, diagObj.db.getDiagramTitle());
   log.info('after layout', g);
   g.edges?.map((edge) => {
     insertEdge(edgesEl, edge, edge.edgeData, diagObj, parentLookupDb, id);