From e9bfcc28c3b76bd2e6d8bf35e8cb0efad4d632d7 Mon Sep 17 00:00:00 2001
From: jean-pierre charras <jp.charras@wanadoo.fr>
Date: Thu, 11 Feb 2016 19:12:06 -0500
Subject: [PATCH] Fix HPGL plot divide by zero bug.

---
 common/common_plotHPGL_functions.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/common/common_plotHPGL_functions.cpp b/common/common_plotHPGL_functions.cpp
index 697b1a8541..d412b97a20 100644
--- a/common/common_plotHPGL_functions.cpp
+++ b/common/common_plotHPGL_functions.cpp
@@ -223,8 +223,6 @@ void HPGL_PLOTTER::SetViewport( const wxPoint& aOffset, double aIusPerDecimil,
     paperSize.y *= 10.0 * aIusPerDecimil;
     SetDefaultLineWidth( 0 );    // HPGL has pen sizes instead
     m_plotMirror = aMirror;
-    penOverlap = 0;
-    penDiameter = 0;
 }
 
 
@@ -685,7 +683,12 @@ void HPGL_PLOTTER::FlashPadTrapez( const wxPoint& aPadPos, const wxPoint* aCorne
         }
 
         // Calculation of dd = number of segments was traced to fill.
-        jj = jj / (int) ( penDiameter - penOverlap );
+        int delta = (int) ( penDiameter - penOverlap );
+
+        if( delta )
+            jj = jj / delta;
+        else
+            jj = 0;
 
         // Trace the outline.
         for( ; jj > 0; jj-- )