Support multiline strings in wxDC::DrawRotatedText() in wxMSW.

The native API doesn't support this, so do it by splitting the string into
lines manually.

Closes #9686.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75750 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -40,3 +40,4 @@ wxMSW:
 - Improve wxMimeTypesManager open command detection (Eric Jensen).
 - Make wxFILTER_INCLUDE_LIST in wxTextValidator actually usable.
 - Fix handling of selected images in wxBitmapButton (Artur Wieczorek).
+- Support multiline strings in wxDC::DrawRotatedText() (Artur Wieczorek).

interface/wx/dc.h

@@ -542,6 +542,9 @@ public:
         Draws the text rotated by @a angle degrees 
         (positive angles are counterclockwise; the full angle is 360 degrees).
 
+        Notice that, as with DrawText(), the @a text can contain multiple lines
+        separated by the new line (@c '\\n') characters.
+
         @note Under Win9x only TrueType fonts can be drawn by this function. In
               particular, a font different from @c wxNORMAL_FONT should be used
               as the latter is not a TrueType font. @c wxSWISS_FONT is an

samples/drawing/drawing.cpp

@@ -827,6 +827,10 @@ void MyCanvas::DrawText(wxDC& dc)
 
     y += height;
     dc.DrawText("And\nmore\ntext on\nmultiple\nlines", 110, y);
+    y += 5*height;
+
+    dc.SetTextForeground(*wxBLUE);
+    dc.DrawRotatedText("Rotated text\ncan have\nmultiple lines\nas well", 110, y, 15);
 }
 
 static const struct

src/msw/dc.cpp

@@ -1444,6 +1444,11 @@ void wxMSWDCImpl::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
 
     WXMICROWIN_CHECK_HDC
 
+    // prepare for drawing the text
+    wxTextColoursChanger textCol(GetHdc(), *this);
+
+    wxBkModeChanger bkMode(GetHdc(), m_backgroundMode);
+
     DrawAnyText(text, x, y);
 
     // update the bounding box
@@ -1456,13 +1461,6 @@ void wxMSWDCImpl::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
 
 void wxMSWDCImpl::DrawAnyText(const wxString& text, wxCoord x, wxCoord y)
 {
-    WXMICROWIN_CHECK_HDC
-
-    // prepare for drawing the text
-    wxTextColoursChanger textCol(GetHdc(), *this);
-
-    wxBkModeChanger bkMode(GetHdc(), m_backgroundMode);
-
     if ( ::ExtTextOut(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), 0, NULL,
                    text.c_str(), text.length(), NULL) == 0 )
     {
@@ -1483,6 +1481,8 @@ void wxMSWDCImpl::DoDrawRotatedText(const wxString& text,
     if ( (angle == 0.0) && m_font.IsOk() )
     {
         DoDrawText(text, x, y);
+
+        // Bounding box already updated by DoDrawText(), no need to do it again.
     }
 #ifndef __WXMICROWIN__
     else
@@ -1501,7 +1501,7 @@ void wxMSWDCImpl::DoDrawRotatedText(const wxString& text,
         // GDI wants the angle in tenth of degree
         long angle10 = (long)(angle * 10);
         lf.lfEscapement = angle10;
-        lf. lfOrientation = angle10;
+        lf.lfOrientation = angle10;
 
         hfont = ::CreateFontIndirect(&lf);
         if ( !hfont )
@@ -1512,19 +1512,36 @@ void wxMSWDCImpl::DoDrawRotatedText(const wxString& text,
         {
             HFONT hfontOld = (HFONT)::SelectObject(GetHdc(), hfont);
 
-            DrawAnyText(text, x, y);
+            // Get extent of whole text.
+            wxCoord w, h, heightLine;
+            GetOwner()->GetMultiLineTextExtent(text, &w, &h, &heightLine);
+
+            // Prepare for drawing the text
+            wxTextColoursChanger textCol(GetHdc(), *this);
+            wxBkModeChanger bkMode(GetHdc(), m_backgroundMode);
+
+            // Compute the shift for the origin of the next line.
+            const double rad = DegToRad(angle);
+            const double dx = heightLine * sin(rad);
+            const double dy = heightLine * cos(rad);
+
+            // Draw all text line by line
+            const wxArrayString lines = wxSplit(text, '\n', '\0');
+            for ( size_t lineNum = 0; lineNum < lines.size(); lineNum++ )
+            {
+                // Calculate origin for each line to avoid accumulation of
+                // rounding errors.
+                DrawAnyText(lines[lineNum],
+                            x + wxRound(lineNum*dx),
+                            y + wxRound(lineNum*dy));
+            }
 
             (void)::SelectObject(GetHdc(), hfontOld);
             (void)::DeleteObject(hfont);
-        }
 
             // call the bounding box by adding all four vertices of the rectangle
             // containing the text to it (simpler and probably not slower than
             // determining which of them is really topmost/leftmost/...)
-        wxCoord w, h;
-        GetOwner()->GetTextExtent(text, &w, &h);
-
-        double rad = DegToRad(angle);
 
             // "upper left" and "upper right"
             CalcBoundingBox(x, y);
@@ -1536,6 +1553,8 @@ void wxMSWDCImpl::DoDrawRotatedText(const wxString& text,
             CalcBoundingBox(x, y);
             CalcBoundingBox(x + wxCoord(w*cos(rad)), y - wxCoord(w*sin(rad)));
         }
+
+    }
 #endif
 }