From fcc4b202db7b01ca32ee7d23c7ebd7cc75b5c76e Mon Sep 17 00:00:00 2001
From: Seth Hillbrand <seth@kipro-pcb.com>
Date: Wed, 21 Dec 2022 12:02:35 -0800
Subject: [PATCH] Set interpolation/anti-alias in plots

This doesn't do much for Linux, but the interpolation modes for MSW and
Mac should clean up lines a bit in plotting

Fixes https://gitlab.com/kicad/code/kicad/issues/10239
---
 common/widgets/mathplot.cpp | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/common/widgets/mathplot.cpp b/common/widgets/mathplot.cpp
index bccb00c483..8e9cd46fdd 100644
--- a/common/widgets/mathplot.cpp
+++ b/common/widgets/mathplot.cpp
@@ -31,6 +31,7 @@
 #endif
 
 #include <widgets/mathplot.h>
+#include <wx/graphics.h>
 #include <wx/module.h>
 #include <wx/image.h>
 
@@ -1633,6 +1634,16 @@ mpWindow::mpWindow() : wxWindow(),
         m_movingInfoLayer( nullptr ),
         m_zooming( false )
 {
+    if( wxGraphicsContext *ctx = m_buff_dc.GetGraphicsContext() )
+    {
+        if( !ctx->SetInterpolationQuality( wxINTERPOLATION_BEST )
+                || !ctx->SetInterpolationQuality( wxINTERPOLATION_GOOD ) )
+        {
+            ctx->SetInterpolationQuality( wxINTERPOLATION_FAST );
+        }
+
+        ctx->SetAntialiasMode( wxANTIALIAS_DEFAULT );
+    }
 }
 
 mpWindow::mpWindow( wxWindow* parent,
@@ -1680,6 +1691,17 @@ mpWindow::mpWindow( wxWindow* parent,
     // J.L.Blanco: Eliminates the "flick" with the double buffer.
     SetBackgroundStyle( wxBG_STYLE_CUSTOM );
 
+    if( wxGraphicsContext* ctx = m_buff_dc.GetGraphicsContext() )
+    {
+        if( !ctx->SetInterpolationQuality( wxINTERPOLATION_BEST )
+                || !ctx->SetInterpolationQuality( wxINTERPOLATION_GOOD ) )
+        {
+            ctx->SetInterpolationQuality( wxINTERPOLATION_FAST );
+        }
+
+        ctx->SetAntialiasMode( wxANTIALIAS_DEFAULT );
+    }
+
     UpdateAll();
 }
 
@@ -2345,6 +2367,18 @@ void mpWindow::OnPaint( wxPaintEvent& WXUNUSED( event ) )
 
     // Draw background:
     // trgDc->SetDeviceOrigin(0,0);
+
+    if( wxGraphicsContext* ctx = trgDc->GetGraphicsContext() )
+    {
+        if( !ctx->SetInterpolationQuality( wxINTERPOLATION_BEST )
+                || !ctx->SetInterpolationQuality( wxINTERPOLATION_GOOD ) )
+        {
+            ctx->SetInterpolationQuality( wxINTERPOLATION_FAST );
+        }
+
+        ctx->SetAntialiasMode( wxANTIALIAS_DEFAULT );
+    }
+
     trgDc->SetPen( *wxTRANSPARENT_PEN );
     wxBrush brush( GetBackgroundColour() );
     trgDc->SetBrush( brush );