add fl_draw(int angle, const char* ... functions for rotated text drawing

STR#1840 closed, STR#207 not closed because non-xft functions not implemented 

drawing of N Utf8 characters need correction for rotated and not rotated fl_draw functions not solved!


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@6779 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

FL/fl_draw.H

@@ -283,10 +283,23 @@ FL_EXPORT const char *fl_local_to_mac_roman(const char *t, int n=-1);
   to control characters.
 */
 FL_EXPORT void fl_draw(const char* str, int x, int y);
+/**
+  Draws a nul-terminated string starting at the given location and 
+  rotating \p angle degrees counterclockwise.
+  This version of fl_draw provides direct access to the text drawing
+  function of the underlying OS and suported for Xft, Win32 and MacOS
+  fltk subset.
+*/
+FL_EXPORT void fl_draw(int angle,const char* str, int x, int y);
 /**
   Draws an array of \p n characters starting at the given location.
 */
 FL_EXPORT void fl_draw(const char* str, int n, int x, int y);
+/**
+  Draws an array of \p n characters starting at the given location,
+  rotating \p angle degrees counterclockwise.
+*/
+FL_EXPORT void fl_draw(int angle,const char* str, int n, int x, int y);
 /**
   Draws an array of \p n characters right to left starting at given location.
 */

TODO.utf8

@@ -28,6 +28,8 @@ Bugs that have to be fixed before an RC
 
     * Make consistent use of fltk's utf8 functions for e.g. all string handling (see Ian's post on 03/25/09)
 
+    * fix fl_draw(cons char*, int n, int x, int y) and related for drawing realy n unicode characters 
+
     * (add your items here)
 
 

src/Fl_Font.H

@@ -56,6 +56,7 @@ public:
   HFONT fid;
   int *width[64];
   TEXTMETRIC metr;
+  int angle;
   FL_EXPORT Fl_Font_Descriptor(const char* fontname, Fl_Fontsize size);
 #  elif defined(__APPLE_QD__)
   FL_EXPORT Fl_Font_Descriptor(const char* fontname, Fl_Fontsize size);
@@ -76,6 +77,7 @@ public:
   XftFont* font;
   const char* encoding;
   Fl_Fontsize size;
+  int angle;
   FL_EXPORT Fl_Font_Descriptor(const char* xfontname);
 #  else
   XUtf8FontStruct* font;	// X UTF-8 font information

src/fl_font.cxx

@@ -68,6 +68,10 @@ void fl_draw(const char* str, int x, int y) {
   fl_draw(str, strlen(str), x, y);
 }
 
+void fl_draw(int angle, const char* str, int x, int y) {
+  fl_draw(angle, str, strlen(str), x, y);//must be fixed!
+}
+
 void fl_text_extents(const char *c, int &dx, int &dy, int &w, int &h) {
   if (c)  fl_text_extents(c, strlen(c), dx, dy, w, h);
   else {

src/fl_font_mac.cxx

@@ -339,6 +339,29 @@ void fl_draw(const char *str, int n, float x, float y) {
   err = ATSUDrawText(layout, kATSUFromTextBeginning, n, FloatToFixed(x), FloatToFixed(y));
 }
 
+void fl_draw(int angle, const char *str, int n, int x, int y) {
+  OSStatus err;
+    // convert to UTF-16 first
+  UniChar *uniStr = mac_Utf8_to_Utf16(str, n, &n);
+  
+  // avoid a crash if no font has been selected by user yet !
+  check_default_font();
+  // now collect our ATSU resources
+  ATSUTextLayout layout = fl_fontsize->layout;
+
+  Fixed ang = IntToFixed(-angle);
+  ByteCount iSize[] = {sizeof(Fixed), sizeof(CGContextRef)};
+  ATSUAttributeTag iTag[] = {kATSULineRotationTag, kATSUCGContextTag};
+  ATSUAttributeValuePtr aAttr[] = { &ang,  &fl_gc};
+  ATSUSetLayoutControls(layout, 2, iTag, iSize, aAttr);
+
+  err = ATSUSetTextPointerLocation(layout, uniStr, kATSUFromTextBeginning, n, n);
+  err = ATSUDrawText(layout, kATSUFromTextBeginning, n, FloatToFixed(x), FloatToFixed(y));
+  //restore layout baseline
+  ang = IntToFixed(0);
+  ATSUSetLayoutControls(layout, 2, iTag, iSize, aAttr);
+}
+
 void fl_rtl_draw(const char* c, int n, int x, int y) {
 // I guess with ATSU the thing to do is force the layout mode to RTL and let ATSU draw the text...
   double offs = fl_width(c, n);

src/fl_font_win32.cxx

@@ -24,6 +24,8 @@
 //
 //     http://www.fltk.org/str.php
 //
+static int fl_angle_ = 0;
+
 #ifndef FL_DOXYGEN
 Fl_Font_Descriptor::Fl_Font_Descriptor(const char* name, Fl_Fontsize size) {
   int weight = FW_NORMAL;
@@ -38,8 +40,8 @@ Fl_Font_Descriptor::Fl_Font_Descriptor(const char* name, Fl_Fontsize size) {
   fid = CreateFont(
     -size, // negative makes it use "char size"
     0,	            // logical average character width
-    0,	            // angle of escapement
-    0,	            // base-line orientation angle
+    fl_angle_*10,	            // angle of escapement
+    fl_angle_*10,	            // base-line orientation angle
     weight,
     italic,
     FALSE,	        // underline attribute flag
@@ -51,6 +53,7 @@ Fl_Font_Descriptor::Fl_Font_Descriptor(const char* name, Fl_Fontsize size) {
     DEFAULT_PITCH,	// pitch and family
     name	        // pointer to typeface name string
     );
+  angle = fl_angle_;
   if (!fl_gc) fl_GetDC(0);
   SelectObject(fl_gc, fid);
   GetTextMetrics(fl_gc, &metr);
@@ -111,12 +114,12 @@ static Fl_Fontdesc built_in_table[] = {
 
 Fl_Fontdesc* fl_fonts = built_in_table;
 
-static Fl_Font_Descriptor* find(Fl_Font fnum, Fl_Fontsize size) {
+static Fl_Font_Descriptor* find(Fl_Font fnum, Fl_Fontsize size, int angle) {
   Fl_Fontdesc* s = fl_fonts+fnum;
   if (!s->name) s = fl_fonts; // use 0 if fnum undefined
   Fl_Font_Descriptor* f;
   for (f = s->first; f; f = f->next)
-    if (f->minsize <= size && f->maxsize >= size) return f;
+    if (f->minsize <= size && f->maxsize >= size && f->angle == angle) return f;
   f = new Fl_Font_Descriptor(s->name, size);
   f->next = s->first;
   s->first = f;
@@ -130,14 +133,18 @@ Fl_Font fl_font_ = 0;
 Fl_Fontsize fl_size_ = 0;
 //static HDC font_gc;
 
-void fl_font(Fl_Font fnum, Fl_Fontsize size) {
+void fl_font(Fl_Font fnum, Fl_Fontsize size, int angle) {
   if (fnum==-1) { // just make sure that we will load a new font next time
-    fl_font_ = 0; fl_size_ = 0;
+    fl_font_ = 0; fl_size_ = 0; fl_angle_ = 0;
     return;
   }
-  if (fnum == fl_font_ && size == fl_size_) return;
-  fl_font_ = fnum; fl_size_ = size;
-  fl_fontsize = find(fnum, size);
+  if (fnum == fl_font_ && size == fl_size_ && angle == fl_angle_) return;
+  fl_font_ = fnum; fl_size_ = size; fl_angle_ = angle;
+  fl_fontsize = find(fnum, size, angle);
+}
+
+void fl_font(Fl_Font fnum, Fl_Fontsize size) {
+  fl_font(fnum, size, 0);
 }
 
 int fl_height() {
@@ -335,6 +342,30 @@ void fl_draw(const char* str, int n, int x, int y) {
   SetTextColor(fl_gc, oldColor);
 }
 
+void fl_draw(int angle, const char* str, int n, int x, int y) {
+  fl_font(fl_font_, fl_size_, angle);
+//  fl_draw(str, n, (int)x, (int)y);
+  int i = 0, i2=0;
+  char *end = (char *)&str[n];
+  COLORREF oldColor = SetTextColor(fl_gc, fl_RGB());
+  SelectObject(fl_gc, fl_fontsize->fid);
+  //unsigned short ucs[n]; //only GCC, but not MSVC
+  unsigned short* ucs = new unsigned short[n];
+  while (i < n) {
+    unsigned int u;
+    int l;
+    u = fl_utf8decode((const char*)(str + i), end, &l);
+    ucs[i2] = u;
+    if (l < 1) l = 1;
+    i += l;
+    ++i2;
+  }
+  TextOutW(fl_gc, x, y, (WCHAR*)ucs, i2);
+  delete[] ucs;
+  SetTextColor(fl_gc, oldColor);
+  fl_font(fl_font_, fl_size_);
+}
+
 void fl_rtl_draw(const char* c, int n, int x, int y) {
   int wn;
   int i = 0;

src/fl_font_x.cxx

@@ -319,7 +319,10 @@ void fl_draw(const char* c, int n, int x, int y) {
 //  XDrawString(fl_display, fl_window, fl_gc, x, y, c, n);
   XUtf8DrawString(fl_display, fl_window, fl_xfont, fl_gc, x, y, c, n);
 }
-
+void fl_draw(int angle, const char *str, int n, int x, int y) {
+  fprintf(stderr,"ROTATING TEXT NOT IMPLIMENTED\n");
+  fl_draw(str, n, (int)x, (int)y);
+}
 //void fl_draw(const char* str, int n, float x, float y) {
 //  fl_draw(str, n, (int)x, (int)y);
 //}

src/fl_font_xft.cxx

@@ -65,6 +65,8 @@
 
 #include <X11/Xft/Xft.h>
 
+#include <math.h>
+
 // The predefined fonts that FLTK has:
 static Fl_Fontdesc built_in_table[] = {
 {" sans"},
@@ -91,6 +93,7 @@ Fl_Fontdesc* fl_fonts = built_in_table;
 
 Fl_Font fl_font_ = 0;
 Fl_Fontsize fl_size_ = 0;
+int fl_angle_ = 0; // internal for rotating text support
 //XFontStruct* fl_xfont = 0;
 XUtf8FontStruct* fl_xfont = 0;
 void *fl_xftfont = 0;
@@ -98,21 +101,23 @@ void *fl_xftfont = 0;
 const char* fl_encoding_ = "iso10646-1";
 Fl_Font_Descriptor* fl_fontsize = 0;
 
-void fl_font(Fl_Font fnum, Fl_Fontsize size) {
+
+
+void fl_font(Fl_Font fnum, Fl_Fontsize size, int angle) {
   if (fnum==-1) { // special case to stop font caching
-    fl_font_ = 0; fl_size_ = 0;
+    fl_font_ = 0; fl_size_ = 0; fl_angle_ = 0;
     return;
   }
-  if (fnum == fl_font_ && size == fl_size_
+  if (fnum == fl_font_ && size == fl_size_ && angle == fl_angle_
       && fl_fontsize)
 //      && !strcasecmp(fl_fontsize->encoding, fl_encoding_))
     return;
-  fl_font_ = fnum; fl_size_ = size;
+  fl_font_ = fnum; fl_size_ = size; fl_angle_ = angle;
   Fl_Fontdesc *font = fl_fonts + fnum;
   Fl_Font_Descriptor* f;
   // search the fontsizes we have generated already
   for (f = font->first; f; f = f->next) {
-    if (f->size == size)// && !strcasecmp(f->encoding, fl_encoding_))
+    if (f->size == size && f->angle == angle)// && !strcasecmp(f->encoding, fl_encoding_))
       break;
   }
   if (!f) {
@@ -127,7 +132,11 @@ void fl_font(Fl_Font fnum, Fl_Fontsize size) {
   fl_xftfont = (void*)f->font;
 }
 
-static XftFont* fontopen(const char* name, bool core) {
+void fl_font(Fl_Font fnum, Fl_Fontsize size) {
+  fl_font(fnum,size,0);
+}
+
+static XftFont* fontopen(const char* name, bool core, int angle) {
   // Check: does it look like we have been passed an old-school XLFD fontname?
   bool is_xlfd = false;
   int hyphen_count = 0;
@@ -207,6 +216,14 @@ static XftFont* fontopen(const char* name, bool core) {
     XftPatternAddDouble (fnt_pat, XFT_PIXEL_SIZE, (double)fl_size_);
     XftPatternAddString (fnt_pat, XFT_ENCODING, fl_encoding_);
 
+    // rotate font if fl_angle_!=0
+    if (fl_angle_ !=0) {
+      XftMatrix m;
+      XftMatrixInit(&m);
+      XftMatrixRotate(&m,cos(M_PI*fl_angle_/180.),sin(M_PI*fl_angle_/180.));
+      XftPatternAddMatrix (fnt_pat, XFT_MATRIX,&m);
+    }
+
     if (core) {
       XftPatternAddBool(fnt_pat, XFT_CORE, FcTrue);
       XftPatternAddBool(fnt_pat, XFT_RENDER, FcFalse);
@@ -295,10 +312,11 @@ puts("Font Opened"); fflush(stdout);
 Fl_Font_Descriptor::Fl_Font_Descriptor(const char* name) {
 //  encoding = fl_encoding_;
   size = fl_size_;
+  angle = fl_angle_;
 #if HAVE_GL
   listbase = 0;
 #endif // HAVE_GL
-  font = fontopen(name, false);
+  font = fontopen(name, false, angle);
 }
 
 Fl_Font_Descriptor::~Fl_Font_Descriptor() {
@@ -514,6 +532,12 @@ void fl_draw(const char *str, int n, int x, int y) {
   XftDrawStringUtf8(draw, &color, current_font, x, y, (XftChar8 *)str, n);
 }
 
+void fl_draw(int angle, const char *str, int n, int x, int y) {
+  fl_font(fl_font_, fl_size_, angle);
+  fl_draw(str, n, (int)x, (int)y);
+  fl_font(fl_font_, fl_size_);
+}
+
 void fl_draw(const char* str, int n, float x, float y) {
   fl_draw(str, n, (int)x, (int)y);
 }

test/Makefile

@@ -84,6 +84,7 @@ CPPFILES =\
 	radio.cxx \
 	resizebox.cxx \
 	resize.cxx \
+	rotated_text.cxx \
 	scroll.cxx \
 	shape.cxx \
 	subwindow.cxx \
@@ -146,6 +147,7 @@ ALL =	\
 	radio$(EXEEXT) \
 	resize$(EXEEXT) \
 	resizebox$(EXEEXT) \
+	rotated_text$(EXEEXT) \
 	scroll$(EXEEXT) \
 	subwindow$(EXEEXT) \
 	sudoku$(EXEEXT) \
@@ -398,6 +400,8 @@ resize.cxx:	resize.fl ../fluid/fluid$(EXEEXT)
 
 resizebox$(EXEEXT): resizebox.o
 
+rotated_text$(EXEEXT): rotated_text.o
+
 scroll$(EXEEXT): scroll.o
 
 subwindow$(EXEEXT): subwindow.o