Fix LyXLength::inPixels

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@5507 a592a061-630c-0410-9148-cb99ea01b6c8

src/insets/insetminipage.C

@@ -351,6 +351,5 @@ int InsetMinipage::getMaxWidth(BufferView * bv, UpdatableInset const * inset)
 
 int InsetMinipage::latexTextWidth(BufferView * bv) const
 {
-	return width_.inPixels(InsetCollapsable::latexTextWidth(bv),
-			       bv->text->defaultHeight());
+	return width_.inPixels(InsetCollapsable::latexTextWidth(bv));
 }

src/insets/insettabular.C

@@ -2243,7 +2243,7 @@ int InsetTabular::getMaxWidthOfCell(BufferView * bv, int cell) const
 
 	if (len.zero())
 		return -1;
-	return len.inPixels(latexTextWidth(bv), bv->text->defaultHeight());
+	return len.inPixels(latexTextWidth(bv));
 }
 
 

src/insets/insetwrap.C

@@ -205,8 +205,7 @@ int InsetWrap::getMaxWidth(BufferView * bv, UpdatableInset const * inset)
 
 int InsetWrap::latexTextWidth(BufferView * bv) const
 {
-	return width_.inPixels(InsetCollapsable::latexTextWidth(bv),
-			       bv->text->defaultHeight());
+	return width_.inPixels(InsetCollapsable::latexTextWidth(bv));
 }
 
 

src/lyxlength.C

@@ -123,7 +123,7 @@ bool LyXLength::zero() const
 }
 
 
-int LyXLength::inPixels(int default_width, int default_height) const
+int LyXLength::inPixels(int text_width, int em_width_base) const
 {
 	// Zoom factor specified by user in percent
 	double const zoom = lyxrc.zoom / 100.0; // [percent]
@@ -131,12 +131,18 @@ int LyXLength::inPixels(int default_width, int default_height) const
 	// DPI setting for monitor: pixels/inch
 	double const dpi = lyxrc.dpi; // screen resolution [pixels/inch]
 
+	double const em_width = (em_width_base > 0)
+		? em_width_base
+		: 10*(dpi/72.27)*zoom;
+	// A different estimate for em_width is 
+	// font_metrics::width('M', LyXFont(LyXFont::ALL_SANE))
+	// but this estimate might not be more accurate as the screen font
+	// is different then the latex font.
+
 	// Pixel values are scaled so that the ratio
 	// between lengths and font sizes on the screen
 	// is the same as on paper.
 
-	// we don't care about sign of value, we
-	// display negative space with text too
 #ifdef WITH_WARNINGS
 #warning if you don't care than either call this function differently or let it return negative values and call abs() explicitly when needed (Andre')
 #endif
@@ -191,26 +197,30 @@ int LyXLength::inPixels(int default_width, int default_height) const
 	case LyXLength::EX:
 		// Ex: The height of an "x"
 		// 0.4305 is the ration between 1ex and 1em in cmr10
-		result = zoom * val_ * default_height * 0.4305;
+		result = val_ * em_width * 0.4305;
 		break;
 	case LyXLength::EM:
 		// Em: The width of an "m"
-		// 1em is approx 10points in cmr10
-		result = zoom * val_ * default_height;
+		result = val_ * em_width;
 		break;
 	case LyXLength::MU:
 		// math unit = 1/18em
-		result = val_ * default_height / 18;
+		result = val_ * em_width / 18;
 		break;
 	case LyXLength::PCW: // Always % of workarea
 	case LyXLength::PTW:
-	case LyXLength::PPW:
 	case LyXLength::PLW:
-		result = val_ * default_width / 100;
+		result = val_ * text_width / 100;
+		break;
+	case LyXLength::PPW:
+		// paperwidth/textwidth is 1.7 for A4 paper with default margins
+		result = val_ * text_width * 1.7 / 100;
 		break;
 	case LyXLength::PTH:
+		result = val_ * text_width * 1.787 / 100;
+		break;
 	case LyXLength::PPH:
-		result = val_ * default_height / 100;
+		result = val_ * text_width * 2.2 / 100;
 		break;
 	case LyXLength::UNIT_NONE:
 		result = 0;  // this cannot happen

src/lyxlength.h

@@ -68,7 +68,7 @@ public:
 	/// return string representation for LaTeX
 	string const asLatexString() const;
 	/// return the on-screen size of this length
-	int inPixels(int default_width, int default_height) const;
+	int inPixels(int text_width, int em_width = 0) const;
 	/// return the on-screen size of this length of an image
 	int inBP() const;
 

src/text.C

@@ -847,7 +847,7 @@ int LyXText::leftMargin(BufferView * bview, Row const * row) const
 		LyXLength const len = row->par()->params().leftIndent();
 		int const tw = inset_owner ?
 			inset_owner->latexTextWidth(bview) : workWidth(bview);
-		x += len.inPixels(tw, bview->text->defaultHeight());
+		x += len.inPixels(tw);
 	}
 
 	LyXAlignment align; // wrong type

src/vspace.C

@@ -505,7 +505,7 @@ int VSpace::inPixels(BufferView const * bv) const
 		break;
 
 	case LENGTH:
-		retval = len_.len().inPixels(bv->workWidth(), default_height);
+		retval = len_.len().inPixels(bv->workWidth());
 		break;
 
 	}