From 542c3f954c9fd62f245e16859bb20b0f5ea98643 Mon Sep 17 00:00:00 2001
From: stackdump <myork@stackdump.com>
Date: Sun, 31 Dec 2023 02:12:24 -0600
Subject: [PATCH] calculate viewport

---
 metamodel/image/svg_test.go | 4 +---
 metamodel/metamodel.go      | 9 +++++++--
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/metamodel/image/svg_test.go b/metamodel/image/svg_test.go
index baa31cc..426b08c 100644
--- a/metamodel/image/svg_test.go
+++ b/metamodel/image/svg_test.go
@@ -13,9 +13,7 @@ func TestNewSvg(t *testing.T) {
 	// Load a model from a URL
 	mm := metamodel.New("test")
 	mm.UnzipUrl(sampleUrl)
-	x1, y1, x2, y2 := mm.GetViewPort()
-	width := x2 - x1
-	height := y2 - y1
+	x1, y1, width, height := mm.GetViewPort()
 	i := image.NewSvgFile("/tmp/test.svg", width, height, x1, y1, width, height)
 	i.Rect(x1, y1, width, height, "fill: #fff; stroke: #000; stroke-width: 1px;")
 	i.Render(mm)
diff --git a/metamodel/metamodel.go b/metamodel/metamodel.go
index 31115b9..5bb5dd2 100644
--- a/metamodel/metamodel.go
+++ b/metamodel/metamodel.go
@@ -398,7 +398,7 @@ type Model struct {
 	*PetriNet
 }
 
-func (m *Model) GetViewPort() (x1 int, x2 int, y1 int, y2 int) {
+func (m *Model) GetViewPort() (x1 int, y1 int, width int, height int) {
 	var minX int64 = 0
 	var minY int64 = 0
 	var limitX int64 = 0
@@ -433,7 +433,12 @@ func (m *Model) GetViewPort() (x1 int, x2 int, y1 int, y2 int) {
 		}
 	}
 	const margin = 60
-	return int(minX) - margin, int(minY) - margin, int(limitX) + margin, int(limitY) + margin
+	x1 = int(minX) - margin
+	y1 = int(minY) - margin
+	x2 := int(limitX) + margin
+	y2 := int(limitY) + margin
+
+	return x1, y1, x2 - x1, y2 - y1
 }
 
 func (m *Model) exportObjectJsonDefinition() (obj []byte, ok bool) {