From 54a2da2fa035b7fc7660b9c26f1521c09a5f8148 Mon Sep 17 00:00:00 2001
From: Matt Hall <5151457+mattEhall@users.noreply.github.com>
Date: Wed, 12 Jun 2024 17:11:50 -0600
Subject: [PATCH] Subsystem.plot2d fix (positions were offset incorrectly)

---
 moorpy/subsystem.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/moorpy/subsystem.py b/moorpy/subsystem.py
index 697ed55..c940021 100644
--- a/moorpy/subsystem.py
+++ b/moorpy/subsystem.py
@@ -366,9 +366,9 @@ def drawLine2d(self, Time, ax, color="k", endpoints=False, Xuvec=[1,0,0], Yuvec=
             # get the Line's local coordinates
             Xs0, Ys0, Zs, tensions = line.getLineCoords(Time)
             
-            # transform to global coordinates
-            Xs = self.rA[0] + Xs0*self.cos_th - Ys0*self.sin_th
-            Ys = self.rA[1] + Xs0*self.sin_th + Ys0*self.cos_th
+            # transform to global coordinates (Ys0 should be zero for now)
+            Xs = self.rA[0] + (Xs0 + self.span)*self.cos_th - Ys0*self.sin_th
+            Ys = self.rA[1] + (Xs0 + self.span)*self.sin_th + Ys0*self.cos_th
             
             # apply 3D to 2D transformation to provide desired viewing angle
             Xs2d = Xs*Xuvec[0] + Ys*Xuvec[1] + Zs*Xuvec[2] + Xoff