From 53709d641a5408245506240dfc34990fb90a1733 Mon Sep 17 00:00:00 2001
From: Gavin Nishizawa <gavin@terrastruct.com>
Date: Thu, 25 May 2023 14:45:19 -0700
Subject: [PATCH] export connection truncate decimals along route

---
 d2exporter/export.go | 10 +++++++++-
 lib/geo/point.go     | 10 ++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/d2exporter/export.go b/d2exporter/export.go
index fc3557c37..eb163b1dc 100644
--- a/d2exporter/export.go
+++ b/d2exporter/export.go
@@ -11,6 +11,7 @@ import (
 	"oss.terrastruct.com/d2/d2target"
 	"oss.terrastruct.com/d2/d2themes"
 	"oss.terrastruct.com/d2/lib/color"
+	"oss.terrastruct.com/d2/lib/geo"
 )
 
 func Export(ctx context.Context, g *d2graph.Graph, fontFamily *d2fonts.FontFamily) (*d2target.Diagram, error) {
@@ -297,7 +298,14 @@ func toConnection(edge *d2graph.Edge, theme *d2themes.Theme) d2target.Connection
 	if edge.LabelPercentage != nil {
 		connection.LabelPercentage = *edge.LabelPercentage
 	}
-	connection.Route = edge.Route
+	connection.Route = make([]*geo.Point, 0, len(edge.Route))
+	for i := range edge.Route {
+		p := edge.Route[i].Copy()
+		p.TruncateDecimals()
+		p.TruncateFloat32()
+		connection.Route = append(connection.Route, p)
+	}
+
 	connection.IsCurve = edge.IsCurve
 
 	connection.Src = edge.Src.AbsID()
diff --git a/lib/geo/point.go b/lib/geo/point.go
index 18a4ba8c7..0b0a4ff51 100644
--- a/lib/geo/point.go
+++ b/lib/geo/point.go
@@ -295,3 +295,13 @@ func (a *Point) Interpolate(b *Point, t float64) *Point {
 		a.Y*(1.0-t)+b.Y*t,
 	)
 }
+
+func (p *Point) TruncateFloat32() {
+	p.X = float64(float32(p.X))
+	p.Y = float64(float32(p.Y))
+}
+
+func (p *Point) TruncateDecimals() {
+	p.X = TruncateDecimals(p.X)
+	p.Y = TruncateDecimals(p.Y)
+}