X-Git-Url: http://winboard.nl/cgi-bin?a=blobdiff_plain;f=draw.c;h=c681eaed4407eee25ce299e0ce76a7750d44d1b1;hb=a009a27e8c1e0bfa818f12fdcae675d0babc510a;hp=668e4a568104411b67ea1d7b6dbe57a875090b46;hpb=caa23c86bfabccac8edc448f6521e475b1f65d36;p=xboard.git

diff --git a/draw.c b/draw.c
index 668e4a5..c681eae 100644
--- a/draw.c
+++ b/draw.c
@@ -5,7 +5,7 @@
  * Massachusetts.
  *
  * Enhancements Copyright 1992-2001, 2002, 2003, 2004, 2005, 2006,
- * 2007, 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
+ * 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
  *
  * The following terms apply to Digital Equipment Corporation's copyright
  * interest in XBoard:
@@ -55,6 +55,8 @@
 #include <math.h>
 #include <cairo/cairo.h>
 #include <cairo/cairo-xlib.h>
+#include <librsvg/rsvg.h>
+#include <librsvg/rsvg-cairo.h>
 
 #if STDC_HEADERS
 # include <stdlib.h>
@@ -72,22 +74,13 @@ extern char *getenv();
 #include <locale.h>
 #endif
 
-
-// [HGM] bitmaps: put before incuding the bitmaps / pixmaps, to know how many piece types there are.
 #include "common.h"
 
-#if HAVE_LIBXPM
-#include "pixmaps/pixmaps.h"
-#else
-#include "bitmaps/bitmaps.h"
-#endif
-
-#include "frontend.h"
 #include "backend.h"
-#include "xevalgraph.h"
 #include "board.h"
 #include "menus.h"
 #include "dialogs.h"
+#include "evalgraph.h"
 #include "gettext.h"
 #include "draw.h"
 
@@ -115,6 +108,7 @@ cairo_surface_t *csBoardWindow;
 static cairo_surface_t *pngPieceImages[2][(int)BlackPawn+4];   // png 256 x 256 images
 static cairo_surface_t *pngPieceBitmaps[2][(int)BlackPawn];    // scaled pieces as used
 static cairo_surface_t *pngPieceBitmaps2[2][(int)BlackPawn+4]; // scaled pieces in store
+static RsvgHandle *svgPieces[2][(int)BlackPawn+4]; // vector pieces in store
 static cairo_surface_t *pngBoardBitmap[2];
 int useTexture, textureW[2], textureH[2];
 
@@ -123,6 +117,9 @@ int useTexture, textureW[2], textureH[2];
 
 #define White(piece) ((int)(piece) < (int)BlackPawn)
 
+char *crWhite = "#FFFFB0";
+char *crBlack = "#AD5D3D";
+
 struct {
   int x1, x2, y1, y2;
 } gridSegments[BOARD_RANKS + BOARD_FILES + 2];
@@ -137,18 +134,43 @@ SwitchWindow ()
     csBoardWindow = DRAWABLE(currBoard);
 }
 
+void
+SelectPieces(VariantClass v)
+{
+    int i;
+    for(i=0; i<2; i++) {
+	int p;
+	for(p=0; p<=(int)WhiteKing; p++)
+	   pngPieceBitmaps[i][p] = pngPieceBitmaps2[i][p]; // defaults
+	if(v == VariantShogi) {
+	   pngPieceBitmaps[i][(int)WhiteCannon] = pngPieceBitmaps2[i][(int)WhiteKing+1];
+	   pngPieceBitmaps[i][(int)WhiteNightrider] = pngPieceBitmaps2[i][(int)WhiteKing+2];
+	   pngPieceBitmaps[i][(int)WhiteSilver] = pngPieceBitmaps2[i][(int)WhiteKing+3];
+	   pngPieceBitmaps[i][(int)WhiteGrasshopper] = pngPieceBitmaps2[i][(int)WhiteKing+4];
+	   pngPieceBitmaps[i][(int)WhiteQueen] = pngPieceBitmaps2[i][(int)WhiteLance];
+	}
+#ifdef GOTHIC
+	if(v == VariantGothic) {
+	   pngPieceBitmaps[i][(int)WhiteMarshall] = pngPieceBitmaps2[i][(int)WhiteSilver];
+	}
+#endif
+	if(v == VariantSChess) {
+	   pngPieceBitmaps[i][(int)WhiteAngel]    = pngPieceBitmaps2[i][(int)WhiteFalcon];
+	   pngPieceBitmaps[i][(int)WhiteMarshall] = pngPieceBitmaps2[i][(int)WhiteAlfil];
+	}
+    }
+}
+
 #define BoardSize int
 void
 InitDrawingSizes (BoardSize boardSize, int flags)
 {   // [HGM] resize is functional now, but for board format changes only (nr of ranks, files)
     int boardWidth, boardHeight;
-    int i;
     static int oldWidth, oldHeight;
     static VariantClass oldVariant;
     static int oldMono = -1, oldTwoBoards = 0;
-    extern Widget formWidget;
 
-    if(!formWidget) return;
+    if(!mainOptions[W_BOARD].handle) return;
 
     if(oldTwoBoards && !twoBoards) PopDown(DummyDlg);
     oldTwoBoards = twoBoards;
@@ -175,27 +197,8 @@ InitDrawingSizes (BoardSize boardSize, int flags)
 
   if(gameInfo.variant != oldVariant) { // and only if variant changed
 
-    for(i=0; i<2; i++) {
-	int p;
-	for(p=0; p<=(int)WhiteKing; p++)
-	   pngPieceBitmaps[i][p] = pngPieceBitmaps2[i][p]; // defaults
-	if(gameInfo.variant == VariantShogi) {
-	   pngPieceBitmaps[i][(int)WhiteCannon] = pngPieceBitmaps2[i][(int)WhiteKing+1];
-	   pngPieceBitmaps[i][(int)WhiteNightrider] = pngPieceBitmaps2[i][(int)WhiteKing+2];
-	   pngPieceBitmaps[i][(int)WhiteSilver] = pngPieceBitmaps2[i][(int)WhiteKing+3];
-	   pngPieceBitmaps[i][(int)WhiteGrasshopper] = pngPieceBitmaps2[i][(int)WhiteKing+4];
-	   pngPieceBitmaps[i][(int)WhiteQueen] = pngPieceBitmaps2[i][(int)WhiteLance];
-	}
-#ifdef GOTHIC
-	if(gameInfo.variant == VariantGothic) {
-	   pngPieceBitmaps[i][(int)WhiteMarshall] = pngPieceBitmaps2[i][(int)WhiteSilver];
-	}
-#endif
-	if(gameInfo.variant == VariantSChess) {
-	   pngPieceBitmaps[i][(int)WhiteAngel]    = pngPieceBitmaps2[i][(int)WhiteFalcon];
-	   pngPieceBitmaps[i][(int)WhiteMarshall] = pngPieceBitmaps2[i][(int)WhiteAlfil];
-	}
-    }
+    SelectPieces(gameInfo.variant);
+
     oldMono = -10; // kludge to force recreation of animation masks
     oldVariant = gameInfo.variant;
   }
@@ -203,6 +206,17 @@ InitDrawingSizes (BoardSize boardSize, int flags)
   oldMono = appData.monoMode;
 }
 
+void
+ExposeRedraw (Option *graph, int x, int y, int w, int h)
+{   // copy a selected part of the buffer bitmap to the display
+    cairo_t *cr = cairo_create((cairo_surface_t *) graph->textValue);
+    cairo_set_source_surface(cr, (cairo_surface_t *) graph->choice, 0, 0);
+    cairo_set_antialias(cr, CAIRO_ANTIALIAS_NONE);
+    cairo_rectangle(cr, x, y, w, h);
+    cairo_fill(cr);
+    cairo_destroy(cr);
+}
+
 static void
 CreatePNGBoard (char *s, int kind)
 {
@@ -223,59 +237,79 @@ char *pngPieceNames[] = // must be in same order as internal piece encoding
   "GoldKnight", "GoldLance", "GoldPawn", "GoldSilver", NULL
 };
 
-cairo_surface_t *
-ConvertPixmap (int color, int piece)
-{
-  int i, j, stride, f, colcode[10], w, b;
-  char ch[10];
-  cairo_surface_t *res;
-  XpmPieces *p = builtInXpms + 10;
-  char **pixels = p->xpm[piece % BlackPawn][2*color];
-  int *buf;
-  sscanf(pixels[0], "%*d %*d %d", &f);
-  sscanf(appData.whitePieceColor+1, "%x", &w);
-  sscanf(appData.blackPieceColor+1, "%x", &b);
-  res = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, p->size, p->size);
-  stride = cairo_image_surface_get_stride(res);
-  buf = (int *) cairo_image_surface_get_data(res);
-  for(i=0; i<f; i++) {
-    ch[i] = pixels[i+1][0];
-    colcode[i] = 0;
-    if(strstr(pixels[i+1], "black")) colcode[i] = 0xFF000000; // 0xFF000000 + (color ? b : 0);
-    if(strstr(pixels[i+1], "white")) colcode[i] = 0xFFFFFFCC; // 0xFF000000 + w;
-  }
-  for(i=0; i<p->size; i++) {
-    for(j=0; j<p->size; j++) {
-      char c = pixels[i+f+1][j];
-      int k;
-      for(k=0; ch[k] != c && k < f; k++);
-      buf[i*p->size + j] = colcode[k];
+RsvgHandle *
+LoadSVG (char *dir, int color, int piece)
+{
+    char buf[MSG_SIZ];
+  RsvgHandle *svg=svgPieces[color][piece];
+  RsvgDimensionData svg_dimensions;
+  GError *svgerror=NULL;
+  cairo_surface_t *img;
+  cairo_t *cr;
+
+    snprintf(buf, MSG_SIZ, "%s/%s%s.svg", dir, color ? "Black" : "White", pngPieceNames[piece]);
+
+    if(svg || *dir && (svg = rsvg_handle_new_from_file(buf, &svgerror))) {
+
+      rsvg_handle_get_dimensions(svg, &svg_dimensions);
+      img = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, squareSize,  squareSize);
+
+      cr = cairo_create(img);
+      cairo_scale(cr, squareSize/(double) svg_dimensions.width, squareSize/(double) svg_dimensions.height);
+      rsvg_handle_render_cairo(svg, cr);
+      if(cairo_surface_status(img) == CAIRO_STATUS_SUCCESS) {
+        if(pngPieceImages[color][piece]) cairo_surface_destroy(pngPieceImages[color][piece]);
+        pngPieceImages[color][piece] = img;
+      }
+      cairo_destroy(cr);
+
+      return svg;
     }
-  }
-  cairo_surface_mark_dirty(res);
-  return res;
+    if(svgerror)
+	g_error_free(svgerror);
+    return NULL;
 }
 
 static void
-ScaleOnePiece (char *name, int color, int piece)
+ScaleOnePiece (int color, int piece)
 {
   float w, h;
   char buf[MSG_SIZ];
   cairo_surface_t *img, *cs;
   cairo_t *cr;
 
-  if((img = pngPieceImages[color][piece]) == NULL) { // if PNG file for this piece was not yet read, read it now and store it
-    if(!*appData.pngDirectory) img = ConvertPixmap(color, piece); else {
-      snprintf(buf, MSG_SIZ, "%s/%s%s.png", appData.pngDirectory, color ? "Black" : "White", pngPieceNames[piece]);
-      img = cairo_image_surface_create_from_png (buf);
-      if(cairo_surface_status(img) != CAIRO_STATUS_SUCCESS) img = ConvertPixmap(color, piece);
+  g_type_init ();
+
+  svgPieces[color][piece] = LoadSVG("", color, piece); // this fills pngPieceImages if we had cached svg with bitmap of wanted size
+
+  if(!pngPieceImages[color][piece]) { // we don't have cached bitmap (implying we did not have cached svg)
+    if(*appData.pieceDirectory) { // user specified piece directory
+      snprintf(buf, MSG_SIZ, "%s/%s%s.png", appData.pieceDirectory, color ? "Black" : "White", pngPieceNames[piece]);
+      img = cairo_image_surface_create_from_png (buf); // try if there are png pieces there
+      if(cairo_surface_status(img) != CAIRO_STATUS_SUCCESS) { // there were not
+	svgPieces[color][piece] = LoadSVG(appData.pieceDirectory, color, piece); // so try if he has svg there
+      } else pngPieceImages[color][piece] = img;
+    }
+  }
+
+  if(!pngPieceImages[color][piece]) { // we still did not manage to acquire a piece bitmap
+    static int warned = 0;
+    if(!(svgPieces[color][piece] = LoadSVG(SVGDIR, color, piece)) && !warned) { // try to fall back on installed svg
+      char *msg = _("No default pieces installed\nSelect your own -pieceImageDirectory");
+      printf("%s\n", msg); // give up
+      DisplayError(msg, 0);
+      warned = 1; // prevent error message being repeated for each piece type
     }
   }
-  pngPieceImages[color][piece] = img;
+
+  img = pngPieceImages[color][piece];
+
   // create new bitmap to hold scaled piece image (and remove any old)
   if(pngPieceBitmaps2[color][piece]) cairo_surface_destroy (pngPieceBitmaps2[color][piece]);
   pngPieceBitmaps2[color][piece] = cs = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, squareSize, squareSize);
-  if(piece <= WhiteKing) pngPieceBitmaps[color][piece] = cs;
+
+  if(!img) return;
+
   // scaled copying of the raw png image
   cr = cairo_create(cs);
   w = cairo_image_surface_get_width (img);
@@ -284,7 +318,8 @@ ScaleOnePiece (char *name, int color, int piece)
   cairo_set_source_surface (cr, img, 0, 0);
   cairo_paint (cr);
   cairo_destroy (cr);
-  { // operate on bitmap to color it (king-size hack...)
+
+  if(!appData.trueColors || !*appData.pieceDirectory) { // operate on bitmap to color it (king-size hack...)
     int stride = cairo_image_surface_get_stride(cs)/4;
     int *buf = (int *) cairo_image_surface_get_data(cs);
     int i, j, p;
@@ -299,6 +334,11 @@ ScaleOnePiece (char *name, int color, int piece)
 	buf[i*stride + j] = c & 0xFF000000; // alpha channel is kept at same opacity
 	buf[i*stride + j] += ((int)(f*(p&0xFF0000)) & 0xFF0000) + ((int)(f*(p&0xFF00)) & 0xFF00) + (int)(f*(p&0xFF)); // add desired fraction of new color
 	if(color) buf[i*stride + j] += r | r << 8 | r << 16; // details on black pieces get their weight added in pure white
+	if(appData.monoMode) {
+	    if(a < 64) buf[i*stride + j] = 0; // if not opaque enough, totally transparent
+	    else if(2*r < a) buf[i*stride + j] = 0xFF000000; // if not light enough, totally black
+            else buf[i*stride + j] = 0xFFFFFFFF; // otherwise white
+	}
     }
     cairo_surface_mark_dirty(cs);
   }
@@ -310,9 +350,10 @@ CreatePNGPieces ()
   int p;
 
   for(p=0; pngPieceNames[p]; p++) {
-    ScaleOnePiece(pngPieceNames[p], 0, p);
-    ScaleOnePiece(pngPieceNames[p], 1, p);
+    ScaleOnePiece(0, p);
+    ScaleOnePiece(1, p);
   }
+  SelectPieces(gameInfo.variant);
 }
 
 void
@@ -327,11 +368,12 @@ void
 InitDrawingParams (int reloadPieces)
 {
     int i, p;
-    MakeColors();
     if(reloadPieces)
     for(i=0; i<2; i++) for(p=0; p<BlackPawn+4; p++) {
 	if(pngPieceImages[i][p]) cairo_surface_destroy(pngPieceImages[i][p]);
 	pngPieceImages[i][p] = NULL;
+	if(svgPieces[i][p]) rsvg_handle_close(svgPieces[i][p], NULL);
+	svgPieces[i][p] = NULL;
     }
     CreateAnyPieces();
 }
@@ -372,6 +414,7 @@ void DrawSeekAxis( int x, int y, int xTo, int yTo )
 
     /* free memory */
     cairo_destroy (cr);
+    GraphExpose(currBoard, x-1, yTo-1, xTo-x+2, y-yTo+2);
 }
 
 void DrawSeekBackground( int left, int top, int right, int bottom )
@@ -385,6 +428,7 @@ void DrawSeekBackground( int left, int top, int right, int bottom )
 
     /* free memory */
     cairo_destroy (cr);
+    GraphExpose(currBoard, left, top, right-left, bottom-top);
 }
 
 void DrawSeekText(char *buf, int x, int y)
@@ -403,6 +447,7 @@ void DrawSeekText(char *buf, int x, int y)
 
     /* free memory */
     cairo_destroy (cr);
+    GraphExpose(currBoard, x-5, y-10, 60, 15);
 }
 
 void DrawSeekDot(int x, int y, int colorNr)
@@ -427,6 +472,7 @@ void DrawSeekDot(int x, int y, int colorNr)
 
     /* free memory */
     cairo_destroy (cr);
+    GraphExpose(currBoard, x-squareSize/8, y-squareSize/8, 2*(squareSize/8), 2*(squareSize/8));
 }
 
 void
@@ -436,16 +482,6 @@ InitDrawingHandle (Option *opt)
 }
 
 void
-DrawSeekOpen ()
-{
-}
-
-void
-DrawSeekClose ()
-{
-}
-
-void
 CreateGrid ()
 {
     int i, j;
@@ -476,9 +512,9 @@ DrawGrid()
 {
   /* draws a grid starting around Nx, Ny squares starting at x,y */
   int i;
+  float odd = (lineGap & 1)/2.;
   cairo_t *cr;
 
-  DrawSeekOpen();
   /* get a cairo_t */
   cr = cairo_create (csBoardWindow);
 
@@ -488,8 +524,9 @@ DrawGrid()
   /* lines in X */
   for (i = 0; i < BOARD_WIDTH + BOARD_HEIGHT + 2; i++)
     {
-      cairo_move_to (cr, gridSegments[i].x1, gridSegments[i].y1);
-      cairo_line_to (cr, gridSegments[i].x2, gridSegments[i].y2);
+      int h = (gridSegments[i].y1 == gridSegments[i].y2); // horizontal
+      cairo_move_to (cr, gridSegments[i].x1 + !h*odd, gridSegments[i].y1 + h*odd);
+      cairo_line_to (cr, gridSegments[i].x2 + !h*odd, gridSegments[i].y2 + h*odd);
       cairo_stroke (cr);
     }
 
@@ -500,10 +537,9 @@ DrawGrid()
 }
 
 void
-DrawBorder (int x, int y, int type)
+DrawBorder (int x, int y, int type, int odd)
 {
     cairo_t *cr;
-    DrawSeekOpen();
     char *col;
 
     switch(type) {
@@ -513,11 +549,11 @@ DrawBorder (int x, int y, int type)
     }
     cr = cairo_create(csBoardWindow);
     cairo_set_antialias(cr, CAIRO_ANTIALIAS_NONE);
-    cairo_rectangle(cr, x, y, squareSize+lineGap, squareSize+lineGap);
+    cairo_rectangle(cr, x+odd/2., y+odd/2., squareSize+lineGap, squareSize+lineGap);
     SetPen(cr, lineGap, col, 0);
     cairo_stroke(cr);
     cairo_destroy(cr);
-    GraphExpose(currBoard, x - lineGap/2, y - lineGap/2, squareSize+2*lineGap, squareSize+2*lineGap);
+    GraphExpose(currBoard, x - lineGap/2, y - lineGap/2, squareSize+2*lineGap+odd, squareSize+2*lineGap+odd);
 }
 
 static int
@@ -550,7 +586,8 @@ DrawLogo (Option *opt, void *logo)
     w = cairo_image_surface_get_width (img);
     h = cairo_image_surface_get_height (img);
     cr = cairo_create(DRAWABLE(opt));
-    cairo_scale(cr, (float)appData.logoSize/w, appData.logoSize/(2.*h));
+//    cairo_scale(cr, (float)appData.logoSize/w, appData.logoSize/(2.*h));
+    cairo_scale(cr, (float)opt->max/w, (float)opt->value/h);
     cairo_set_source_surface (cr, img, 0, 0);
     cairo_paint (cr);
     cairo_destroy (cr);
@@ -580,7 +617,8 @@ BlankSquare (cairo_surface_t *dest, int x, int y, int color, ChessSquare piece,
 	  case 2: col = "#000000"; break;
 	}
 	SetPen(cr, 2.0, col, 0);
-	cairo_rectangle (cr, x, y, squareSize, squareSize);
+	cairo_rectangle (cr, fac*x, fac*y, squareSize, squareSize);
+	cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
 	cairo_fill (cr);
 	cairo_destroy (cr);
     }
@@ -628,8 +666,8 @@ DoDrawDot (cairo_surface_t *cs, int marker, int x, int y, int r)
 void
 DrawDot (int marker, int x, int y, int r)
 { // used for atomic captures; no need to draw on backup
-  DrawSeekOpen();
   DoDrawDot(csBoardWindow, marker, x, y, r);
+  GraphExpose(currBoard, x-r, y-r, 2*r, 2*r);
 }
 
 void
@@ -638,8 +676,6 @@ DrawOneSquare (int x, int y, ChessSquare piece, int square_color, int marker, ch
     // piece, background, coordinate/count, marker dot
     cairo_t *cr;
 
-    DrawSeekOpen();
-
     if (piece == EmptySquare) {
 	BlankSquare(csBoardWindow, x, y, square_color, piece, 1);
     } else {
@@ -696,7 +732,6 @@ static cairo_surface_t *c_animBufs[3*NrOfAnims]; // newBuf, saveBuf
 static void
 InitAnimState (AnimNr anr)
 {
-    DrawSeekOpen(); // set cs to board widget
     if(c_animBufs[anr]) cairo_surface_destroy (c_animBufs[anr]);
     if(c_animBufs[anr+2]) cairo_surface_destroy (c_animBufs[anr+2]);
     c_animBufs[anr+4] = csBoardWindow;
@@ -737,13 +772,15 @@ DrawBlank (AnimNr anr, int x, int y, int startColor)
 void CopyRectangle (AnimNr anr, int srcBuf, int destBuf,
 		 int srcX, int srcY, int width, int height, int destX, int destY)
 {
-	cairo_t *cr = cairo_create (c_animBufs[anr+destBuf]);
+	cairo_t *cr;
+	c_animBufs[anr+4] = csBoardWindow;
+	cr = cairo_create (c_animBufs[anr+destBuf]);
 	cairo_set_source_surface (cr, c_animBufs[anr+srcBuf], destX - srcX, destY - srcY);
 	cairo_rectangle (cr, destX, destY, width, height);
 	cairo_fill (cr);
 	cairo_destroy (cr);
-	if(c_animBufs[anr+destBuf] == csBoardWindow)
-	    GraphExpose(currBoard, destX, destY, squareSize, squareSize);
+	if(c_animBufs[anr+destBuf] == csBoardWindow) // suspect that GTK needs this!
+	    GraphExpose(currBoard, destX, destY, width, height);
 }
 
 void
@@ -782,4 +819,107 @@ DrawPolygon (Pnt arrow[], int nr)
 //    if(!dual) DoDrawPolygon(csBoardBackup, arrow, nr);
 }
 
+//-------------------- Eval Graph drawing routines (formerly in xevalgraph.h) --------------------
+
+static void
+ChoosePen(cairo_t *cr, int i)
+{
+  switch(i) {
+    case PEN_BLACK:
+      SetPen(cr, 1.0, "#000000", 0);
+      break;
+    case PEN_DOTTED:
+      SetPen(cr, 1.0, "#A0A0A0", 1);
+      break;
+    case PEN_BLUEDOTTED:
+      SetPen(cr, 1.0, "#0000FF", 1);
+      break;
+    case PEN_BOLDWHITE:
+      SetPen(cr, 3.0, crWhite, 0);
+      break;
+    case PEN_BOLDBLACK:
+      SetPen(cr, 3.0, crBlack, 0);
+      break;
+    case PEN_BACKGD:
+      SetPen(cr, 3.0, "#E0E0F0", 0);
+      break;
+  }
+}
+
+// [HGM] front-end, added as wrapper to avoid use of LineTo and MoveToEx in other routines (so they can be back-end)
+void
+DrawSegment (int x, int y, int *lastX, int *lastY, int penType)
+{
+  static int curX, curY;
+
+  if(penType != PEN_NONE) {
+    cairo_t *cr = cairo_create(DRAWABLE(disp));
+    cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
+    cairo_move_to (cr, curX, curY);
+    cairo_line_to (cr, x,y);
+    ChoosePen(cr, penType);
+    cairo_stroke (cr);
+    cairo_destroy (cr);
+  }
+
+  if(lastX != NULL) { *lastX = curX; *lastY = curY; }
+  curX = x; curY = y;
+}
+
+// front-end wrapper for drawing functions to do rectangles
+void
+DrawRectangle (int left, int top, int right, int bottom, int side, int style)
+{
+  cairo_t *cr;
+
+  cr = cairo_create (DRAWABLE(disp));
+  cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
+  cairo_rectangle (cr, left, top, right-left, bottom-top);
+  switch(side)
+    {
+    case 0: ChoosePen(cr, PEN_BOLDWHITE); break;
+    case 1: ChoosePen(cr, PEN_BOLDBLACK); break;
+    case 2: ChoosePen(cr, PEN_BACKGD); break;
+    }
+  cairo_fill (cr);
+
+  if(style != FILLED)
+    {
+      cairo_rectangle (cr, left, top, right-left-1, bottom-top-1);
+      ChoosePen(cr, PEN_BLACK);
+      cairo_stroke (cr);
+    }
+
+  cairo_destroy(cr);
+}
+
+// front-end wrapper for putting text in graph
+void
+DrawEvalText (char *buf, int cbBuf, int y)
+{
+    // the magic constants 8 and 5 should really be derived from the font size somehow
+  cairo_text_extents_t extents;
+  cairo_t *cr = cairo_create(DRAWABLE(disp));
+
+  /* GTK-TODO this has to go into the font-selection */
+  cairo_select_font_face (cr, "Sans",
+			  CAIRO_FONT_SLANT_NORMAL,
+			  CAIRO_FONT_WEIGHT_NORMAL);
+  cairo_set_font_size (cr, 12.0);
+
+
+  cairo_text_extents (cr, buf, &extents);
+
+  cairo_move_to (cr, MarginX - 2 - 8*cbBuf, y+5);
+  cairo_text_path (cr, buf);
+  cairo_set_source_rgb (cr, 0.0, 0.0, 0);
+  cairo_fill_preserve (cr);
+  cairo_set_source_rgb (cr, 0, 1.0, 0);
+  cairo_set_line_width (cr, 0.1);
+  cairo_stroke (cr);
+
+  /* free memory */
+  cairo_destroy (cr);
+}
+