From 2b147475fddb530a24e1deb2fbab6e0ee71798a9 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sun, 27 Apr 2014 22:39:01 +0000
Subject: [PATCH] Fix precision in wxGraphicsContext::{Stroke,Draw}Lines()
 under MSW.

Use floating point coordinates instead of ints which were used for some
reason, resulting in a loss of precision.

Closes #16187.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76405 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 docs/changes.txt     |  1 +
 src/msw/graphics.cpp | 12 ++++++------
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/docs/changes.txt b/docs/changes.txt
index 640114f82a..6e6100b7d5 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -655,6 +655,7 @@ wxMSW:
 - Fix expander in non left-most position in wxDataViewCtrl (Laurent Poujoulat).
 - Don't fail when using large paper sizes in print preview.
 - Fix wxRichMessageDialog return value for dialog with only "OK" button.
+- Fix precision loss in wxGraphicsContext::{Draw,Stroke}Lines() (tibo_).
 
 wxOSX:
 
diff --git a/src/msw/graphics.cpp b/src/msw/graphics.cpp
index e0af6a5d10..e46c3709c3 100644
--- a/src/msw/graphics.cpp
+++ b/src/msw/graphics.cpp
@@ -1488,11 +1488,11 @@ void wxGDIPlusContext::StrokeLines( size_t n, const wxPoint2DDouble *points)
    if ( !m_pen.IsNull() )
    {
        wxGDIPlusOffsetHelper helper( m_context , ShouldOffset() );
-       Point *cpoints = new Point[n];
+       PointF *cpoints = new PointF[n];
        for (size_t i = 0; i < n; i++)
        {
-           cpoints[i].X = (int)(points[i].m_x );
-           cpoints[i].Y = (int)(points[i].m_y );
+           cpoints[i].X = static_cast<REAL>(points[i].m_x);
+           cpoints[i].Y = static_cast<REAL>(points[i].m_y);
 
        } // for (size_t i = 0; i < n; i++)
        m_context->DrawLines( ((wxGDIPlusPenData*)m_pen.GetGraphicsData())->GetGDIPlusPen() , cpoints , n ) ;
@@ -1506,11 +1506,11 @@ void wxGDIPlusContext::DrawLines( size_t n, const wxPoint2DDouble *points, wxPol
         return;
 
     wxGDIPlusOffsetHelper helper( m_context , ShouldOffset() );
-    Point *cpoints = new Point[n];
+    PointF *cpoints = new PointF[n];
     for (size_t i = 0; i < n; i++)
     {
-        cpoints[i].X = (int)(points[i].m_x );
-        cpoints[i].Y = (int)(points[i].m_y );
+        cpoints[i].X = static_cast<REAL>(points[i].m_x);
+        cpoints[i].Y = static_cast<REAL>(points[i].m_y);
 
     } // for (int i = 0; i < n; i++)
     if ( !m_brush.IsNull() )