From 66815259f590d8a88cab69e0a813bc6e8c6029cc Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Sat, 15 Sep 2012 23:19:35 +0000
Subject: [PATCH] Fix text origin and bounding box computations in wxSVGFileDC.

Text origin was calculated incorrectly for the rotated text and the bounding
box was wrong even in non-rotated case.

Fix this by using correct definition of the text anchor according to the SVG
specification and add a test to the svg sample demonstrating this.

Closes #14489.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72494 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 docs/changes.txt        |  1 +
 samples/svg/svgtest.cpp | 48 ++++++++++++++++++++++++++++++++++++++++-
 src/common/dcsvg.cpp    | 11 ++++++----
 3 files changed, 55 insertions(+), 5 deletions(-)

diff --git a/docs/changes.txt b/docs/changes.txt
index a46dd90547..20aa862f3c 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -551,6 +551,7 @@ All (GUI):
 - Add wxBitmapButton::NewCloseButton().
 - Add wxTextEntry::SelectNone() (troelsk).
 - Restore the original wxGrid col/row size when unhiding it (Michael Richards).
+- Fix text origin and extent computations in wxSVGFileDC (Neil Chittenden).
 
 wxGTK:
 
diff --git a/samples/svg/svgtest.cpp b/samples/svg/svgtest.cpp
index 8e792daa71..ba6561bd06 100644
--- a/samples/svg/svgtest.cpp
+++ b/samples/svg/svgtest.cpp
@@ -40,6 +40,8 @@
     #include "../sample.xpm"
 #endif
 
+#include <math.h>
+
 class MyChild;
 class MyCanvas;
 
@@ -321,7 +323,7 @@ MyCanvas::MyCanvas(MyChild *parent, const wxPoint& pos, const wxSize& size)
     SetBackgroundColour(wxColour(wxT("WHITE")));
 
     m_child = parent;
-    m_index = m_child->GetFrame()->GetCountOfChildren() % 7;
+    m_index = m_child->GetFrame()->GetCountOfChildren() % 8;
 }
 
 // Define the repainting behaviour
@@ -493,6 +495,50 @@ void MyCanvas::OnDraw(wxDC& dc)
 #endif // wxUSE_STATUSBAR
             break;
 
+        case 7:
+            wxString txtStr;
+            wxCoord txtX, txtY, txtW, txtH, txtDescent, txtEL;
+            wxCoord txtPad = 0;
+
+            wP = *wxRED_PEN;
+            dc.SetPen(wP);
+            //dc.SetBackgroundMode(wxBRUSHSTYLE_SOLID);
+            //dc.SetTextBackground(*wxBLUE);
+
+            // Horizontal text
+            txtStr = wxT("Horizontal string");
+            dc.GetTextExtent(txtStr, &txtW, &txtH, &txtDescent, &txtEL);
+            txtX = 50;
+            txtY = 300;
+            dc.DrawRectangle(txtX, txtY, txtW + 2*txtPad, txtH + 2*txtPad);
+            dc.DrawText(txtStr, txtX + txtPad, txtY + txtPad);
+
+            // Vertical text
+            txtStr = wxT("Vertical string");
+            dc.GetTextExtent(txtStr, &txtW, &txtH, &txtDescent, &txtEL);
+            txtX = 50;
+            txtY = 250;
+            dc.DrawRectangle(txtX, txtY - (txtW + 2*txtPad), txtH + 2*txtPad, txtW + 2*txtPad);
+            dc.DrawRotatedText(txtStr, txtX + txtPad, txtY - txtPad, 90);
+
+            // 45 degree text
+            txtStr = wxT("45 deg string");
+            dc.GetTextExtent(txtStr, &txtW, &txtH, &txtDescent, &txtEL);
+            double lenW = (double)(txtW + 2*txtPad) / sqrt(2.0);
+            double lenH = (double)(txtH + 2*txtPad) / sqrt(2.0);
+            double padding = (double)txtPad / sqrt(2.0);
+            txtX = 150;
+            txtY = 200;
+            dc.DrawLine(txtX - padding, txtY, txtX + lenW, txtY - lenW); // top
+            dc.DrawLine(txtX + lenW, txtY - lenW, txtX - padding + lenH + lenW, txtY + (lenH - lenW));
+            dc.DrawLine(txtX - padding, txtY, txtX - padding + lenH, txtY + lenH);
+            dc.DrawLine(txtX - padding + lenH, txtY + lenH, txtX - padding + lenH + lenW, txtY + (lenH - lenW)); // bottom
+            dc.DrawRotatedText(txtStr, txtX, txtY, 45);
+#if wxUSE_STATUSBAR
+            s = wxT("Text position test page");
+#endif // wxUSE_STATUSBAR
+            break;
+
     }
 #if wxUSE_STATUSBAR
     m_child->SetStatusText(s);
diff --git a/src/common/dcsvg.cpp b/src/common/dcsvg.cpp
index 6d922b3fae..494d78b519 100644
--- a/src/common/dcsvg.cpp
+++ b/src/common/dcsvg.cpp
@@ -253,23 +253,26 @@ void wxSVGFileDCImpl::DoDrawRotatedText(const wxString& sText, wxCoord x, wxCoor
     CalcBoundingBox((wxCoord)(x + w*cos(rad)), (wxCoord)(y - h*sin(rad)));
 
     // wxT("bottom left") and wxT("bottom right")
-    x += (wxCoord)(h*sin(rad));
-    y += (wxCoord)(h*cos(rad));
-    CalcBoundingBox(x, y);
     CalcBoundingBox((wxCoord)(x + h*sin(rad)), (wxCoord)(y + h*cos(rad)));
+    CalcBoundingBox((wxCoord)(x + h*sin(rad) + w*cos(rad)), (wxCoord)(y + h*cos(rad) - w*sin(rad)));
 
     if (m_backgroundMode == wxBRUSHSTYLE_SOLID)
     {
         // draw background first
         // just like DoDrawRectangle except we pass the text color to it and set the border to a 1 pixel wide text background
 
-        sTmp.Printf ( wxT(" <rect x=\"%d\" y=\"%d\" width=\"%d\" height=\"%d\" "), x,y+desc-h, w, h );
+        sTmp.Printf ( wxT(" <rect x=\"%d\" y=\"%d\" width=\"%d\" height=\"%d\" "), x, y, w, h );
         s = sTmp + wxT("style=\"") + wxBrushString(m_textBackgroundColour);
         s += wxT("stroke-width:1; ") + wxPenString(m_textBackgroundColour);
         sTmp.Printf ( wxT("\" transform=\"rotate( %s %d %d )  \" />"), NumStr(-angle), x,y );
         s += sTmp + wxT("\n");
         write(s);
     }
+
+    // convert x,y to SVG text x,y (the coordinates of the text baseline)
+    x = (wxCoord)(x + (h-desc)*sin(rad));
+    y = (wxCoord)(y + (h-desc)*cos(rad));
+
     //now do the text itself
     s.Printf (wxT(" <text x=\"%d\" y=\"%d\" "),x,y );
 
-- 
2.45.2