Merge pull request #705 from Vrixyz/602-cardinality-not-showing

wip: class diagram  cardinality display

dist/index.html

@@ -350,11 +350,11 @@
   <div class="mermaid">
 classDiagram
 Class01 <|-- AveryLongClass : Cool
-Class03 *-- Class04
-Class05 o-- Class06
+Class03 "0" *-- "0..n" Class04
+Class05 "1" o-- "many" Class06
 Class07 .. Class08
-Class09 --> C2 : Where am i?
-Class09 --* C3
+Class09 "many" --> "1" C2  : Where am i?
+Class09 "0" --* "1..n" C3
 Class09 --|> Class07
 Class07 : equals()
 Class07 : Object[] elementData

src/diagrams/class/classRenderer.js

@@ -164,20 +164,7 @@ const drawEdge = function (elem, path, relation) {
     svgPath.attr('marker-end', 'url(' + url + '#' + getRelationType(relation.relation.type2) + 'End' + ')')
   }
 
-  let x, y
-  const l = path.points.length
-  if ((l % 2) !== 0) {
-    const p1 = path.points[Math.floor(l / 2)]
-    const p2 = path.points[Math.ceil(l / 2)]
-    x = (p1.x + p2.x) / 2
-    y = (p1.y + p2.y) / 2
-  } else {
-    const p = path.points[Math.floor(l / 2)]
-    x = p.x
-    y = p.y
-  }
-
-  if (typeof relation.title !== 'undefined') {
+  const writeLabel = function (x, y, title) {
     const g = elem.append('g')
       .attr('class', 'classLabel')
     const label = g.append('text')
@@ -186,7 +173,7 @@ const drawEdge = function (elem, path, relation) {
       .attr('y', y)
       .attr('fill', 'red')
       .attr('text-anchor', 'middle')
-      .text(relation.title)
+      .text(title)
 
     window.label = label
     const bounds = label.node().getBBox()
@@ -199,6 +186,54 @@ const drawEdge = function (elem, path, relation) {
       .attr('height', bounds.height + conf.padding)
   }
 
+  const l = path.points.length
+  // title
+  if (typeof relation.title !== 'undefined') {
+    let x, y
+    if ((l % 2) !== 0) {
+      const p1 = path.points[Math.floor(l / 2)]
+      const p2 = path.points[Math.ceil(l / 2)]
+      x = (p1.x + p2.x) / 2
+      y = (p1.y + p2.y) / 2
+    } else {
+      const p = path.points[Math.floor(l / 2)]
+      x = p.x
+      y = p.y
+    }
+
+    writeLabel(x, y, relation.title)
+  }
+
+  const normalize = function (point, scale) {
+    var norm = Math.sqrt(point.x * point.x + point.y * point.y)
+    if (norm !== 0) { // as3 return 0,0 for a point of zero length
+      point.x = scale * point.x / norm
+      point.y = scale * point.y / norm
+    }
+    return point
+  }
+  // Relation title 1
+  if (relation.relationTitle1 !== 'none') {
+    const p = path.points[0]
+    const nextPoint = path.points[1]
+
+    let direction = {x: nextPoint.x - p.x, y: nextPoint.y - p.y}
+    normalize(direction, 10)
+    const offsettedPoint = {x: p.x + direction.x, y: p.y + direction.y}
+
+    writeLabel(offsettedPoint.x, offsettedPoint.y, relation.relationTitle1)
+  }
+  // Relation title 2
+  if (relation.relationTitle2 !== 'none') {
+    const p = path.points[l - 1]
+    const previousPoint = path.points[l - 2]
+
+    let direction = {x: previousPoint.x - p.x, y: previousPoint.y - p.y}
+    normalize(direction, 10)
+    const offsettedPoint = {x: p.x + direction.x, y: p.y + direction.y}
+
+    writeLabel(offsettedPoint.x, offsettedPoint.y, relation.relationTitle2)
+  }
   edgeCount++
 }