working on new positioning

src/HTMLRenderer.h

@@ -1,8 +1,7 @@
 /*
  * HTMLRenderer.h
  *
- *  Created on: Mar 15, 2011
- *      Author: tian
+ * by WangLu
  */
 
 #ifndef HTMLRENDERER_H_

src/HTMLRenderer/state.cc

@@ -7,6 +7,12 @@
  * 2012.08.14
  */
 
+/*
+ * TODO
+ * use relative positioning for rise
+ * negative offset of span
+ */
+
 #include <algorithm>
 
 #include "HTMLRenderer.h"
@@ -313,41 +319,12 @@ void HTMLRenderer::prepare_line(GfxState * state)
         // don't change line_status
     }
 
-    // open new tags when necessary
     if(line_status == LineStatus::NONE)
-    {
         new_line_status = LineStatus::DIV;
 
-        //resync position
-        draw_ty = cur_ty + cur_rise;
-        draw_tx = cur_tx;
-    }
-    else
-    {
-        assert(new_line_status != LineStatus::DIV);
-
-        // horizontal position
-        // try to merge with the last line if possible
-        double target = cur_tx - draw_tx;
-        if(abs(target) < param->h_eps)
-        {
-            // ignore it
-        }
-        else
-        {
-            // don't close a pending span here, keep the styling
-
-            double w;
-            auto wid = install_whitespace(target * draw_scale, w);
-            html_fout << format("<span class=\"_ _%|1$x|\">%2%</span>") % wid % (target > 0 ? " " : "");
-            draw_tx += w / draw_scale;
-        }
-    }
-
     if(new_line_status != LineStatus::NONE)
     {
         // have to open a new tag
-        
         if (new_line_status == LineStatus::DIV)
         {
             // TODO: recheck descent/ascent
@@ -357,6 +334,10 @@ void HTMLRenderer::prepare_line(GfxState * state)
             html_fout << format("<div style=\"bottom:%1%px;left:%2%px;\" class=\"l t%|3$x|\"><em></em>") 
                 % y % x % cur_tm_id;
 
+            //resync position
+            draw_ty = cur_ty + cur_rise;
+            draw_tx = cur_tx;
+
         }
         else if(new_line_status == LineStatus::SPAN)
         {
@@ -370,10 +351,25 @@ void HTMLRenderer::prepare_line(GfxState * state)
         html_fout << format("<span class=\"f%|1$x| s%|2$x| c%|3$x| l%|4$x| w%|5$x|\">") 
             % cur_fn_id % cur_fs_id % cur_color_id % cur_ls_id % cur_ws_id;
 
-        //line_status = new_line_status;
         line_status = LineStatus::SPAN;
     }
 
+    // align horizontal position
+    // try to merge with the last line if possible
+    double target = cur_tx - draw_tx;
+    if(abs(target) < param->h_eps)
+    {
+        // ignore it
+    }
+    else
+    {
+        // don't close a pending span here, keep the styling
+
+        double w;
+        auto wid = install_whitespace(target * draw_scale, w);
+        html_fout << format("<span class=\"_ _%|1$x|\">%2%</span>") % wid % (target > 0 ? " " : "");
+        draw_tx += w / draw_scale;
+    }
 }
 void HTMLRenderer::close_line()
 {

src/HTMLRenderer/text.cc

@@ -167,6 +167,7 @@ void HTMLRenderer::drawString(GfxState * state, GooString * s)
 
     double dx = 0;
     double dy = 0;
+    double dxerr = 0;
     double dx1,dy1;
     double ox, oy;
 
@@ -177,6 +178,11 @@ void HTMLRenderer::drawString(GfxState * state, GooString * s)
     CharCode code;
     Unicode *u = nullptr;
 
+    double fs = state->getFontSize();
+    double cs = state->getCharSpace();
+    double ws = state->getWordSpace();
+    double hs = state->getHorizScaling();
+
     while (len > 0) {
         auto n = font->getNextChar(p, len, &code, &u, &uLen, &dx1, &dy1, &ox, &oy);
 
@@ -193,24 +199,24 @@ void HTMLRenderer::drawString(GfxState * state, GooString * s)
         if((uLen > 0) && (all_of(u, u+uLen, isLegalUnicode)))
         {
             outputUnicodes(html_fout, u, uLen);
-            dx += dx1;
-            dy += dy1;
         }
         else
         {
             // should not consider hozi scaling here
             // will be handled by draw_ctm
-            double target = dx1 + state->getCharSpace();
+            double target = dx1 * fs + state->getCharSpace();
             if(n == 1 && *p == ' ')
                 target += state->getWordSpace();
             
             double w;
             auto wid = install_whitespace(target * draw_scale, w);
             html_fout << format("<span class=\"_ _%|1$x|\">%2%</span>") % wid % (target > 0 ? " " : "");
-            dx += target;
-            dy += dy1;
+            
+            dxerr += w/draw_scale - target;
         }
 
+        dx += dx1;
+        dy += dy1;
 
         ++nChars;
         p += n;
@@ -219,15 +225,13 @@ void HTMLRenderer::drawString(GfxState * state, GooString * s)
 
     // horiz_scaling is merged into ctm now, 
     // so the coordinate system is ugly
-    dx = (dx * state->getFontSize() 
-            + nChars * state->getCharSpace() 
-            + nSpaces * state->getWordSpace()) * state->getHorizScaling();
+    dx = (dx * fs + nChars * cs + nSpaces * ws) * hs;
     
-    dy *= state->getFontSize();
+    dy *= fs;
 
     cur_tx += dx;
     cur_ty += dy;
         
-    draw_tx += dx;
+    draw_tx += dx + dxerr * state->getFontSize() * state->getHorizScaling();
     draw_ty += dy;
 }