Initial revision

git-svn-id: file:///fltk/svn/fltk/trunk@2 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 175 insertions, 0 deletions

diff --git a/src/fl_draw.cxx b/src/fl_draw.cxx
new file mode 100644
index 000000000..eda4bff29
--- /dev/null
+++ b/src/fl_draw.cxx
@@ -0,0 +1,175 @@
+// fl_draw.C
+
+// Implementation of fl_draw(const char*,int,int,int,int,Fl_Align)
+
+// Used to draw all the labels and text, this routine:
+
+// Word wraps the labels to fit into their bounding box.
+// Breaks them into lines at the newlines.
+// Expands all unprintable characters to ^X or \nnn notation
+// Aligns them against the inside of the box.
+
+#include <FL/fl_draw.H>
+#include <string.h>
+
+#define MAXBUF 1024
+
+char fl_draw_shortcut;	// set by fl_labeltypes.C
+static char* underline_at;
+
+// Copy p to buf, replacing unprintable characters with ^X and \nnn
+// Stop at a newline of if MAXBUF characters written to buffer.
+// Also word-wrap if width exceeds maxw.
+// Returns a pointer to the start of the next line of caharcters.
+// Sets n to the number of characters put into the buffer.
+// Sets width to the width of the string in the current font.
+
+static const char*
+expand(const char* from, char* buf, double maxw, int& n, double &width, int wrap) {
+
+  char* o = buf;
+  char* e = buf+(MAXBUF-4);
+  underline_at = 0;
+  char* word_end = o;
+  const char* word_start = from;
+  double w = 0;
+
+  const char* p = from;
+  for (;; p++) {
+
+    int c = *p & 255;
+
+    if (!c || c == ' ' || c == '\n') {
+      // test for word-wrap:
+      if (word_start < p && wrap) {
+	double newwidth = w + fl_width(word_end, o-word_end);
+	if (word_end > buf && newwidth > maxw) { // break before this word
+	  o = word_end;
+	  p = word_start;
+	  break;
+	}
+	word_end = o;
+	w = newwidth;
+      }
+      if (!c) break;
+      else if (c == '\n') {p++; break;}
+      word_start = p+1;
+    }
+
+    if (o > e) break; // don't overflow buffer
+
+    if (c == '\t') {
+      for (c = (o-buf)%8; c<8 && o<e; c++) *o++ = ' ';
+
+    } else if (c == '&' && fl_draw_shortcut && *(p+1)) {
+      if (*(p+1) == '&') {p++; *o++ = '&';}
+      else if (fl_draw_shortcut != 2) underline_at = o;
+
+    } else if (c < ' ' || c == 127) { // ^X
+      *o++ = '^';
+      *o++ = c ^ 0x40;
+
+    } else if (c >= 128 && c < 0xA0) { // \nnn
+      *o++ = '\\';
+      *o++ = (c>>6)+'0';
+      *o++ = ((c>>3)&7)+'0';
+      *o++ = (c&7)+'0';
+
+    } else if (c == 0xA0) { // non-breaking space
+      *o++ = ' ';
+
+    } else {
+      *o++ = c;
+
+    }
+  }
+
+  width = w + fl_width(word_end, o-word_end);
+  *o = 0;
+  n = o-buf;
+  return p;
+}
+
+void fl_draw(
+    const char* str,	// the (multi-line) string
+    int x, int y, int w, int h,	// bounding box
+    Fl_Align align,
+    void (*callthis)(const char*,int,int,int)
+) {
+  if (!str || !*str) return;
+
+  // clip:
+  if (w && h && !fl_not_clipped(x, y, w, h)) return;
+  if (align & FL_ALIGN_CLIP) fl_clip(x, y, w, h);
+
+  const char* p;
+  const char* e;
+  char buf[MAXBUF];
+  int buflen;
+
+  // count how many lines and put the last one into the buffer:
+  int lines;
+  double width;
+  for (p=str,lines=0; ;) {
+    e = expand(p, buf, w, buflen, width, align&FL_ALIGN_WRAP);
+    lines++;
+    if (!*e) break;
+    p = e;
+  }
+
+  // figure out vertical position of the first line:
+  int ypos;
+  int height = fl_height();
+  if (align & FL_ALIGN_BOTTOM) ypos = y+h-(lines-1)*height;
+  else if (align & FL_ALIGN_TOP) ypos = y+height;
+  else ypos = y+(h-lines*height)/2+height;
+
+  // now draw all the lines:
+  int desc = fl_descent();
+  for (p=str; ; ypos += height) {
+    if (lines>1) e = expand(p, buf, w, buflen, width, align&FL_ALIGN_WRAP);
+
+    int xpos;
+    if (align & FL_ALIGN_LEFT) xpos = x;
+    else if (align & FL_ALIGN_RIGHT) xpos = x+w-int(width+.5);
+    else xpos = x+int((w-width)/2);
+
+    callthis(buf,buflen,xpos,ypos-desc);
+
+    if (underline_at)
+      callthis("_",1,xpos+int(fl_width(buf,underline_at-buf)),ypos-desc);
+
+    if (!*e) break;
+    p = e;
+  }
+
+  if (align & FL_ALIGN_CLIP) fl_pop_clip();
+}
+
+void fl_draw(
+  const char* str,	// the (multi-line) string
+  int x, int y, int w, int h,	// bounding box
+  Fl_Align align) {
+  fl_draw(str, x, y, w, h, align, fl_draw);
+}
+
+void fl_measure(const char* str, int& w, int& h) {
+  h = fl_height();
+  if (!str || !*str) {w = 0; return;}
+  const char* p;
+  const char* e;
+  char buf[MAXBUF];
+  int buflen;
+  int lines;
+  double width;
+  int W = 0;
+  for (p=str,lines=0; ;) {
+    e = expand(p, buf, w, buflen, width, w!=0);
+    if (int(width) > W) W = int(width);
+    lines++;
+    if (!*e) break;
+    p = e;
+  }
+  w = W;
+  h = lines*h;
+}