X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=src%2Flyxlength.C;h=c38e7a33729300a0e59ae5ecafa17f3faedb16a1;hb=5d3718cad2a2ef6a4d6a495054ab0705ba27b6b5;hp=fc6504ce4ddcfdfb8104a0ddcc4aae899d6df2f6;hpb=5e7275dabc36e1acb396c45ba27aecf8d8a0171e;p=lyx.git

diff --git a/src/lyxlength.C b/src/lyxlength.C
index fc6504ce4d..c38e7a3372 100644
--- a/src/lyxlength.C
+++ b/src/lyxlength.C
@@ -10,10 +10,6 @@
 
 #include <config.h>
 
-#ifdef __GNUG__
-#pragma implementation
-#endif
-
 #include "lyxlength.h"
 #include "lengthcommon.h"
 #include "lyxrc.h"
@@ -27,7 +23,7 @@
 using std::abs;
 
 LyXLength::LyXLength()
-	: val_(0), unit_(LyXLength::PT)
+	: val_(0), unit_(LyXLength::UNIT_NONE)
 {}
 
 
@@ -53,7 +49,7 @@ string const LyXLength::asString() const
 {
 	ostringstream buffer;
 	buffer << val_ << unit_name[unit_]; // setw?
-	return buffer.str().c_str();
+	return STRCONV(buffer.str());
 }
 
 
@@ -61,35 +57,35 @@ string const LyXLength::asLatexString() const
 {
 	ostringstream buffer;
 	switch (unit_) {
-	case PW:
-	    buffer << abs(static_cast<int>(val_/100)) << "."
+	case PTW:
+	    buffer << abs(static_cast<int>(val_/100)) << '.'
 		   << abs(static_cast<int>(val_)%100) << "\\textwidth";
 	    break;
-	case PE:
-	    buffer << abs(static_cast<int>(val_/100)) << "."
+	case PCW:
+	    buffer << abs(static_cast<int>(val_/100)) << '.'
 		   << abs(static_cast<int>(val_)%100) << "\\columnwidth";
 	    break;
-	case PP:
-	    buffer << abs(static_cast<int>(val_/100)) << "."
+	case PPW:
+	    buffer << abs(static_cast<int>(val_/100)) << '.'
 		   << abs(static_cast<int>(val_)%100) << "\\paperwidth";
 	    break;
-	case PL:
-	    buffer << abs(static_cast<int>(val_/100)) << "."
+	case PLW:
+	    buffer << abs(static_cast<int>(val_/100)) << '.'
 		   << abs(static_cast<int>(val_)%100) << "\\linewidth";
 	    break;
-	case PH:
-	    buffer << abs(static_cast<int>(val_/100)) << "."
+	case PPH:
+	    buffer << abs(static_cast<int>(val_/100)) << '.'
 		   << abs(static_cast<int>(val_)%100) << "\\paperheight";
 	    break;
-	case TH:
-	    buffer << abs(static_cast<int>(val_/100)) << "."
+	case PTH:
+	    buffer << abs(static_cast<int>(val_/100)) << '.'
 		   << abs(static_cast<int>(val_)%100) << "\\textheight";
 	    break;
 	default:
 	    buffer << val_ << unit_name[unit_]; // setw?
 	    break;
 	}
-	return buffer.str().c_str();
+	return STRCONV(buffer.str());
 }
 
 
@@ -123,7 +119,13 @@ bool LyXLength::zero() const
 }
 
 
-int LyXLength::inPixels(int default_width, int default_height) const
+bool LyXLength::empty() const
+{
+	return unit_ == LyXLength::UNIT_NONE;
+}
+
+
+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]
@@ -131,18 +133,23 @@ 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
 
 	double result = 0.0;
-	int val_sign = val_ < 0.0 ? -1 : 1;
 
 	switch (unit_) {
 	case LyXLength::SP:
@@ -191,31 +198,37 @@ int LyXLength::inPixels(int default_width, int default_height) const
 		break;
 	case LyXLength::EX:
 		// Ex: The height of an "x"
-		result = zoom * val_ * default_height / 2; // what to / width?
+		// 0.4305 is the ration between 1ex and 1em in cmr10
+		result = val_ * em_width * 0.4305;
 		break;
-	case LyXLength::EM: // what to / width?
+	case LyXLength::EM:
 		// Em: The width of an "m"
-		result = zoom * val_ * default_height / 2; // Why 2?
+		result = val_ * em_width;
+		break;
+	case LyXLength::MU:
+		// math unit = 1/18em
+		result = val_ * em_width / 18;
+		break;
+	case LyXLength::PCW: // Always % of workarea
+	case LyXLength::PTW:
+	case LyXLength::PLW:
+		result = val_ * text_width / 100;
 		break;
-	case LyXLength::MU: // This is probably only allowed in
-		// math mode
-		result = zoom * val_ * default_height;
+	case LyXLength::PPW:
+		// paperwidth/textwidth is 1.7 for A4 paper with default margins
+		result = val_ * text_width * 1.7 / 100;
 		break;
-	case LyXLength::PW: // Always % of workarea
-	case LyXLength::PE:
-	case LyXLength::PP:
-	case LyXLength::PL:
-		result = val_ * default_width / 100;
+	case LyXLength::PTH:
+		result = val_ * text_width * 1.787 / 100;
 		break;
-	case LyXLength::PH:
-	case LyXLength::TH:
-		result = val_ * default_height / 100;
+	case LyXLength::PPH:
+		result = val_ * text_width * 2.2 / 100;
 		break;
 	case LyXLength::UNIT_NONE:
 		result = 0;  // this cannot happen
 		break;
 	}
-	return static_cast<int>(result * val_sign + 0.5);
+	return static_cast<int>(result + ((result >= 0) ? 0.5 : -0.5));
 }