fix height of class with no rows

d2graph/d2graph.go

@@ -828,7 +828,7 @@ func (obj *Object) GetDefaultSize(mtexts []*d2target.MText, ruler *textmeasure.R
 			rowHeight := GetTextDimensions(mtexts, ruler, anyRowText, go2.Pointer(d2fonts.SourceCodePro)).Height + d2target.VerticalPadding
 			dims.Height = rowHeight * (len(obj.Class.Fields) + len(obj.Class.Methods) + 2)
 		} else {
-			dims.Height = go2.Max(12, labelDims.Height)
+			dims.Height = 2*go2.Max(12, labelDims.Height) + d2target.VerticalPadding
 		}
 
 	case d2target.ShapeSQLTable:

e2etests/regression_test.go

@@ -1,7 +1,10 @@
 package e2etests
 
 import (
+	"math"
 	"testing"
+
+	"oss.terrastruct.com/d2/d2target"
 )
 
 func testRegression(t *testing.T) {
@@ -446,6 +449,30 @@ b -> c
 
 `,
 		},
+		{
+			name: "empty_class_height",
+			script: `
+class1: class with rows {
+	shape: class
+	-num: int
+	-timeout: int
+}
+
+class2: class without rows {
+	shape: class
+}
+`,
+			assertions: func(t *testing.T, g *d2target.Diagram) {
+				if len(g.Shapes) != 2 {
+					t.Fatal("expected 2 shapes")
+				}
+				c1Height := float64(g.Shapes[0].Height)
+				c2Height := float64(g.Shapes[1].Height)
+				if math.Round(c1Height/2.) != c2Height {
+					t.Fatal("expected rowless class to be 1/2 height of class with 2 rows")
+				}
+			},
+		},
 	}
 
 	runa(t, tcs)

e2etests/testdata/regression/empty_class_height/dagre/board.exp.json

@@ -0,0 +1,104 @@
+{
+  "name": "",
+  "fontFamily": "SourceSansPro",
+  "shapes": [
+    {
+      "id": "class1",
+      "type": "class",
+      "pos": {
+        "x": 0,
+        "y": 0
+      },
+      "width": 319,
+      "height": 184,
+      "opacity": 1,
+      "strokeDash": 0,
+      "strokeWidth": 2,
+      "borderRadius": 0,
+      "fill": "#0A0F25",
+      "stroke": "#FFFFFF",
+      "shadow": false,
+      "3d": false,
+      "multiple": false,
+      "double-border": false,
+      "tooltip": "",
+      "link": "",
+      "icon": null,
+      "iconPosition": "",
+      "blend": false,
+      "fields": [
+        {
+          "name": "num",
+          "type": "int",
+          "visibility": "private"
+        },
+        {
+          "name": "timeout",
+          "type": "int",
+          "visibility": "private"
+        }
+      ],
+      "methods": null,
+      "columns": null,
+      "label": "class with rows",
+      "fontSize": 20,
+      "fontFamily": "DEFAULT",
+      "language": "",
+      "color": "#0A0F25",
+      "italic": false,
+      "bold": false,
+      "underline": false,
+      "labelWidth": 214,
+      "labelHeight": 31,
+      "zIndex": 0,
+      "level": 1,
+      "primaryAccentColor": "#0D32B2",
+      "secondaryAccentColor": "#4A6FF3",
+      "neutralAccentColor": "#676C7E"
+    },
+    {
+      "id": "class2",
+      "type": "class",
+      "pos": {
+        "x": 379,
+        "y": 46
+      },
+      "width": 362,
+      "height": 92,
+      "opacity": 1,
+      "strokeDash": 0,
+      "strokeWidth": 2,
+      "borderRadius": 0,
+      "fill": "#0A0F25",
+      "stroke": "#FFFFFF",
+      "shadow": false,
+      "3d": false,
+      "multiple": false,
+      "double-border": false,
+      "tooltip": "",
+      "link": "",
+      "icon": null,
+      "iconPosition": "",
+      "blend": false,
+      "fields": null,
+      "methods": null,
+      "columns": null,
+      "label": "class without rows",
+      "fontSize": 20,
+      "fontFamily": "DEFAULT",
+      "language": "",
+      "color": "#0A0F25",
+      "italic": false,
+      "bold": false,
+      "underline": false,
+      "labelWidth": 257,
+      "labelHeight": 31,
+      "zIndex": 0,
+      "level": 1,
+      "primaryAccentColor": "#0D32B2",
+      "secondaryAccentColor": "#4A6FF3",
+      "neutralAccentColor": "#676C7E"
+    }
+  ],
+  "connections": []
+}

e2etests/testdata/regression/empty_class_height/elk/board.exp.json

@@ -0,0 +1,104 @@
+{
+  "name": "",
+  "fontFamily": "SourceSansPro",
+  "shapes": [
+    {
+      "id": "class1",
+      "type": "class",
+      "pos": {
+        "x": 12,
+        "y": 12
+      },
+      "width": 319,
+      "height": 184,
+      "opacity": 1,
+      "strokeDash": 0,
+      "strokeWidth": 2,
+      "borderRadius": 0,
+      "fill": "#0A0F25",
+      "stroke": "#FFFFFF",
+      "shadow": false,
+      "3d": false,
+      "multiple": false,
+      "double-border": false,
+      "tooltip": "",
+      "link": "",
+      "icon": null,
+      "iconPosition": "",
+      "blend": false,
+      "fields": [
+        {
+          "name": "num",
+          "type": "int",
+          "visibility": "private"
+        },
+        {
+          "name": "timeout",
+          "type": "int",
+          "visibility": "private"
+        }
+      ],
+      "methods": null,
+      "columns": null,
+      "label": "class with rows",
+      "fontSize": 20,
+      "fontFamily": "DEFAULT",
+      "language": "",
+      "color": "#0A0F25",
+      "italic": false,
+      "bold": false,
+      "underline": false,
+      "labelWidth": 214,
+      "labelHeight": 31,
+      "zIndex": 0,
+      "level": 1,
+      "primaryAccentColor": "#0D32B2",
+      "secondaryAccentColor": "#4A6FF3",
+      "neutralAccentColor": "#676C7E"
+    },
+    {
+      "id": "class2",
+      "type": "class",
+      "pos": {
+        "x": 351,
+        "y": 58
+      },
+      "width": 362,
+      "height": 92,
+      "opacity": 1,
+      "strokeDash": 0,
+      "strokeWidth": 2,
+      "borderRadius": 0,
+      "fill": "#0A0F25",
+      "stroke": "#FFFFFF",
+      "shadow": false,
+      "3d": false,
+      "multiple": false,
+      "double-border": false,
+      "tooltip": "",
+      "link": "",
+      "icon": null,
+      "iconPosition": "",
+      "blend": false,
+      "fields": null,
+      "methods": null,
+      "columns": null,
+      "label": "class without rows",
+      "fontSize": 20,
+      "fontFamily": "DEFAULT",
+      "language": "",
+      "color": "#0A0F25",
+      "italic": false,
+      "bold": false,
+      "underline": false,
+      "labelWidth": 257,
+      "labelHeight": 31,
+      "zIndex": 0,
+      "level": 1,
+      "primaryAccentColor": "#0D32B2",
+      "secondaryAccentColor": "#4A6FF3",
+      "neutralAccentColor": "#676C7E"
+    }
+  ],
+  "connections": []
+}