Esempio n. 1
0
        public override Box CreateBox(TexEnvironment environment)
        {
            var texFont = environment.TexFont;
            var style = environment.Style;

            // Calculate minimum clearance amount.
            double clearance;
            var defaultRuleThickness = texFont.GetDefaultLineThickness(style);
            if (style < TexStyle.Text)
                clearance = texFont.GetXHeight(style, texFont.GetCharInfo(sqrtSymbol, style).FontId);
            else
                clearance = defaultRuleThickness;
            clearance = defaultRuleThickness + Math.Abs(clearance) / 4;

            // Create box for base atom, in cramped style.
            var baseBox = this.BaseAtom.CreateBox(environment.GetCrampedStyle());

            // Create box for radical sign.
            var totalHeight = baseBox.Height + baseBox.Depth;
            var radicalSignBox = DelimiterFactory.CreateBox(sqrtSymbol, totalHeight + clearance + defaultRuleThickness,
                environment);

            // Add half of excess height to clearance.
            var delta = radicalSignBox.Depth - (totalHeight + clearance);
            clearance += delta / 2;

            // Create box for square-root containing base box.
            radicalSignBox.Shift = -(baseBox.Height + clearance);
            var overBar = new OverBar(baseBox, clearance, radicalSignBox.Height);
            overBar.Shift = -(baseBox.Height + clearance + defaultRuleThickness);
            var radicalContainerBox = new HorizontalBox(radicalSignBox);
            radicalContainerBox.Add(overBar);

            // If atom is simple radical, just return square-root box.
            if (this.DegreeAtom == null)
                return radicalContainerBox;

            // Atom is complex radical (nth-root).

            // Create box for root atom.
            var rootBox = this.DegreeAtom.CreateBox(environment.GetRootStyle());
            var bottomShift = scale * (radicalContainerBox.Height + radicalContainerBox.Depth);
            rootBox.Shift = radicalContainerBox.Depth - rootBox.Depth - bottomShift;

            // Create result box.
            var resultBox = new HorizontalBox();

            // Add box for negative kern.
            var negativeKern = new SpaceAtom(TexUnit.Mu, -10, 0, 0).CreateBox(environment);
            var xPos = rootBox.Width + negativeKern.Width;
            if (xPos < 0)
                resultBox.Add(new StrutBox(-xPos, 0, 0, 0));

            resultBox.Add(rootBox);
            resultBox.Add(negativeKern);
            resultBox.Add(radicalContainerBox);

            return resultBox;
        }
Esempio n. 2
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        public override Box CreateBox(TexEnvironment environment)
        {
            var texFont = environment.TexFont;
            var style = environment.Style;

            // Create box for base atom.
            var baseBox = this.BaseAtom == null ? StrutBox.Empty : this.BaseAtom.CreateBox(environment.GetCrampedStyle());
            var skew = 0d;
            if (this.BaseAtom is CharSymbol)
                skew = texFont.GetSkew(((CharSymbol)this.BaseAtom).GetCharFont(texFont), style);

            // Find character of best scale for accent symbol.
            var accentChar = texFont.GetCharInfo(AccentAtom.Name, style);
            while (texFont.HasNextLarger(accentChar))
            {
                var nextLargerChar = texFont.GetNextLargerCharInfo(accentChar, style);
                if (nextLargerChar.Metrics.Width > baseBox.Width)
                    break;
                accentChar = nextLargerChar;
            }

            var resultBox = new VerticalBox();

            // Create and add box for accent symbol.
            Box accentBox;
            var accentItalicWidth = accentChar.Metrics.Italic;
            if (accentItalicWidth > TexUtilities.FloatPrecision)
            {
                accentBox = new HorizontalBox(new CharBox(environment, accentChar));
                accentBox.Add(new StrutBox(accentItalicWidth, 0, 0, 0));
            }
            else
            {
                accentBox = new CharBox(environment, accentChar);
            }
            resultBox.Add(accentBox);

            var delta = Math.Min(baseBox.Height, texFont.GetXHeight(style, accentChar.FontId));
            resultBox.Add(new StrutBox(0, -delta, 0, 0));

            // Centre and add box for base atom. Centre base box and accent box with respect to each other.
            var boxWidthsDiff = (baseBox.Width - accentBox.Width) / 2;
            accentBox.Shift = skew + Math.Max(boxWidthsDiff, 0);
            if (boxWidthsDiff < 0)
                baseBox = new HorizontalBox(baseBox, accentBox.Width, TexAlignment.Center);
            resultBox.Add(baseBox);

            // Adjust height and depth of result box.
            var depth = baseBox.Depth;
            var totalHeight = resultBox.Height + resultBox.Depth;
            resultBox.Depth = depth;
            resultBox.Height = totalHeight - depth;

            return resultBox;
        }
Esempio n. 3
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        public override Box CreateBox(TexEnvironment environment)
        {
            // Create box for base atom, in cramped style.
            var baseBox = this.BaseAtom == null ? StrutBox.Empty : this.BaseAtom.CreateBox(environment.GetCrampedStyle());

            // Create result box.
            var defaultLineThickness = environment.TexFont.GetDefaultLineThickness(environment.Style);
            var resultBox = new OverBar(baseBox, 3 * defaultLineThickness, defaultLineThickness);

            // Adjust height and depth of result box.
            resultBox.Height = baseBox.Height + 5 * defaultLineThickness;
            resultBox.Depth = baseBox.Depth;

            return resultBox;
        }
Esempio n. 4
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        public override Box CreateBox(TexEnvironment environment)
        {
            // Create box for base atom, in cramped style.
            var baseBox = this.BaseAtom == null ? StrutBox.Empty : this.BaseAtom.CreateBox(environment.GetCrampedStyle());

            // Create result box.
            var defaultLineThickness = environment.TexFont.GetDefaultLineThickness(environment.Style);
            var resultBox            = new OverBar(environment, baseBox, 3 * defaultLineThickness, defaultLineThickness);

            // Adjust height and depth of result box.
            resultBox.Height = baseBox.Height + 5 * defaultLineThickness;
            resultBox.Depth  = baseBox.Depth;

            return(resultBox);
        }
Esempio n. 5
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        public override Box CreateBox(TexEnvironment environment)
        {
            var texFont = environment.TexFont;
            var style   = environment.Style;

            // Create box for base atom.
            var baseBox = (this.BaseAtom == null ? StrutBox.Empty : this.BaseAtom.CreateBox(environment));

            if (this.SubscriptAtom == null && this.SuperscriptAtom == null)
            {
                return(baseBox);
            }

            // Create result box.
            var resultBox = new HorizontalBox(baseBox);

            // Get last font used or default Mu font.
            int lastFontId = baseBox.GetLastFontId();

            if (lastFontId == TexFontUtilities.NoFontId)
            {
                lastFontId = texFont.GetMuFontId();
            }

            var subscriptStyle   = environment.GetSubscriptStyle();
            var superscriptStyle = environment.GetSuperscriptStyle();

            // Set delta value and preliminary shift-up and shift-down amounts depending on type of base atom.
            var    delta = 0d;
            double shiftUp, shiftDown;

            if (this.BaseAtom is AccentedAtom)
            {
                var accentedBox = ((AccentedAtom)this.BaseAtom).BaseAtom.CreateBox(environment.GetCrampedStyle());
                shiftUp   = accentedBox.Height - texFont.GetSupDrop(superscriptStyle.Style);
                shiftDown = accentedBox.Depth + texFont.GetSubDrop(subscriptStyle.Style);
            }
            else if (this.BaseAtom is SymbolAtom && this.BaseAtom.Type == TexAtomType.BigOperator)
            {
                var charInfo = texFont.GetCharInfo(((SymbolAtom)this.BaseAtom).Name, style);
                if (style < TexStyle.Text && texFont.HasNextLarger(charInfo))
                {
                    charInfo = texFont.GetNextLargerCharInfo(charInfo, style);
                }
                var charBox = new CharBox(environment, charInfo);

                charBox.Shift = -(charBox.Height + charBox.Depth) / 2 - environment.TexFont.GetAxisHeight(
                    environment.Style);
                resultBox = new HorizontalBox(charBox);

                delta = charInfo.Metrics.Italic;
                if (delta > TexUtilities.FloatPrecision && this.SubscriptAtom == null)
                {
                    resultBox.Add(new StrutBox(delta, 0, 0, 0));
                }

                shiftUp   = resultBox.Height - texFont.GetSupDrop(superscriptStyle.Style);
                shiftDown = resultBox.Depth + texFont.GetSubDrop(subscriptStyle.Style);
            }
            else if (this.BaseAtom is CharSymbol)
            {
                var charFont = ((CharSymbol)this.BaseAtom).GetCharFont(texFont);
                if (!((CharSymbol)this.BaseAtom).IsTextSymbol || !texFont.HasSpace(charFont.FontId))
                {
                    delta = texFont.GetCharInfo(charFont, style).Metrics.Italic;
                }
                if (delta > TexUtilities.FloatPrecision && SubscriptAtom == null)
                {
                    resultBox.Add(new StrutBox(delta, 0, 0, 0));
                    delta = 0;
                }

                shiftUp   = 0;
                shiftDown = 0;
            }
            else
            {
                shiftUp   = baseBox.Height - texFont.GetSupDrop(superscriptStyle.Style);
                shiftDown = baseBox.Depth + texFont.GetSubDrop(subscriptStyle.Style);
            }

            Box superscriptBox          = null;
            Box superscriptContainerBox = null;
            Box subscriptBox            = null;
            Box subscriptContainerBox   = null;

            if (this.SuperscriptAtom != null)
            {
                // Create box for superscript atom.
                superscriptBox          = this.SuperscriptAtom.CreateBox(superscriptStyle);
                superscriptContainerBox = new HorizontalBox(superscriptBox);

                // Add box for script space.
                superscriptContainerBox.Add(scriptSpaceAtom.CreateBox(environment));

                // Adjust shift-up amount.
                double p;
                if (style == TexStyle.Display)
                {
                    p = texFont.GetSup1(style);
                }
                else if (environment.GetCrampedStyle().Style == style)
                {
                    p = texFont.GetSup3(style);
                }
                else
                {
                    p = texFont.GetSup2(style);
                }
                shiftUp = Math.Max(Math.Max(shiftUp, p), superscriptBox.Depth + Math.Abs(texFont.GetXHeight(
                                                                                             style, lastFontId)) / 4);
            }

            if (this.SubscriptAtom != null)
            {
                // Create box for subscript atom.
                subscriptBox          = this.SubscriptAtom.CreateBox(subscriptStyle);
                subscriptContainerBox = new HorizontalBox(subscriptBox);

                // Add box for script space.
                subscriptContainerBox.Add(scriptSpaceAtom.CreateBox(environment));
            }

            // Check if only superscript is set.
            if (subscriptBox == null)
            {
                superscriptContainerBox.Shift = -shiftUp;
                resultBox.Add(superscriptContainerBox);
                return(resultBox);
            }

            // Check if only subscript is set.
            if (superscriptBox == null)
            {
                subscriptContainerBox.Shift = Math.Max(Math.Max(shiftDown, texFont.GetSub1(style)), subscriptBox.Height - 4 *
                                                       Math.Abs(texFont.GetXHeight(style, lastFontId)) / 5);
                resultBox.Add(subscriptContainerBox);
                return(resultBox);
            }

            // Adjust shift-down amount.
            shiftDown = Math.Max(shiftDown, texFont.GetSub2(style));

            // Reposition both subscript and superscript.
            double defaultLineThickness = texFont.GetDefaultLineThickness(style);
            // Space between subscript and superscript.
            double scriptsInterSpace = shiftUp - superscriptBox.Depth + shiftDown - subscriptBox.Height;

            if (scriptsInterSpace < 4 * defaultLineThickness)
            {
                shiftUp += 4 * defaultLineThickness - scriptsInterSpace;

                // Position bottom of superscript at least 4/5 of X-height above baseline.
                double psi = 0.8 * Math.Abs(texFont.GetXHeight(style, lastFontId)) - (shiftUp - superscriptBox.Depth);
                if (psi > 0)
                {
                    shiftUp   += psi;
                    shiftDown -= psi;
                }
            }
            scriptsInterSpace = shiftUp - superscriptBox.Depth + shiftDown - subscriptBox.Height;

            // Create box containing both superscript and subscript.
            var scriptsBox = new VerticalBox();

            superscriptContainerBox.Shift = delta;
            scriptsBox.Add(superscriptContainerBox);
            scriptsBox.Add(new StrutBox(0, scriptsInterSpace, 0, 0));
            scriptsBox.Add(subscriptContainerBox);
            scriptsBox.Height = shiftUp + superscriptBox.Height;
            scriptsBox.Depth  = shiftDown + subscriptBox.Depth;
            resultBox.Add(scriptsBox);

            return(resultBox);
        }
Esempio n. 6
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        public override Box CreateBox(TexEnvironment environment)
        {
            var texFont = environment.MathFont;
            var style   = environment.Style;

            // Create box for base atom.
            var baseBox = this.BaseAtom == null ? StrutBox.Empty : this.BaseAtom.CreateBox(environment.GetCrampedStyle());
            var skew    = 0d;

            if (this.BaseAtom is CharSymbol)
            {
                skew = texFont.GetSkew(((CharSymbol)this.BaseAtom).GetCharFont(texFont), style);
            }

            // Find character of best scale for accent symbol.
            var accentChar = texFont.GetCharInfo(AccentAtom.Name, style);

            while (texFont.HasNextLarger(accentChar))
            {
                var nextLargerChar = texFont.GetNextLargerCharInfo(accentChar, style);
                if (nextLargerChar.Metrics.Width > baseBox.Width)
                {
                    break;
                }
                accentChar = nextLargerChar;
            }

            var resultBox = new VerticalBox();

            // Create and add box for accent symbol.
            Box accentBox;
            var accentItalicWidth = accentChar.Metrics.Italic;

            if (accentItalicWidth > TexUtilities.FloatPrecision)
            {
                accentBox = new HorizontalBox(new CharBox(environment, accentChar));
                accentBox.Add(new StrutBox(accentItalicWidth, 0, 0, 0));
            }
            else
            {
                accentBox = new CharBox(environment, accentChar);
            }
            resultBox.Add(accentBox);

            var delta = Math.Min(baseBox.Height, texFont.GetXHeight(style, accentChar.FontId));

            resultBox.Add(new StrutBox(0, -delta, 0, 0));

            // Centre and add box for base atom. Centre base box and accent box with respect to each other.
            var boxWidthsDiff = (baseBox.Width - accentBox.Width) / 2;

            accentBox.Shift = skew + Math.Max(boxWidthsDiff, 0);
            if (boxWidthsDiff < 0)
            {
                baseBox = new HorizontalBox(baseBox, accentBox.Width, TexAlignment.Center);
            }
            resultBox.Add(baseBox);

            // Adjust height and depth of result box.
            var depth       = baseBox.Depth;
            var totalHeight = resultBox.Height + resultBox.Depth;

            resultBox.Depth  = depth;
            resultBox.Height = totalHeight - depth;

            return(resultBox);
        }
        public override Box CreateBox(TexEnvironment environment)
        {
            var texFont = environment.MathFont;
            var style   = environment.Style;

            // Calculate minimum clearance amount.
            double clearance;
            var    defaultRuleThickness = texFont.GetDefaultLineThickness(style);

            if (style < TexStyle.Text)
            {
                clearance = texFont.GetXHeight(style, texFont.GetCharInfo(sqrtSymbol, style).FontId);
            }
            else
            {
                clearance = defaultRuleThickness;
            }
            clearance = defaultRuleThickness + Math.Abs(clearance) / 4;

            // Create box for base atom, in cramped style.
            var baseBox = this.BaseAtom.CreateBox(environment.GetCrampedStyle());

            // Create box for radical sign.
            var totalHeight    = baseBox.Height + baseBox.Depth;
            var radicalSignBox = DelimiterFactory.CreateBox(sqrtSymbol, totalHeight + clearance + defaultRuleThickness,
                                                            environment);

            // Add half of excess height to clearance.
            var delta = radicalSignBox.Depth - (totalHeight + clearance);

            clearance += delta / 2;

            // Create box for square-root containing base box.
            radicalSignBox.Shift = -(baseBox.Height + clearance);
            var overBar = new OverBar(environment, baseBox, clearance, radicalSignBox.Height);

            overBar.Shift = -(baseBox.Height + clearance + defaultRuleThickness);
            var radicalContainerBox = new HorizontalBox(radicalSignBox);

            radicalContainerBox.Add(overBar);

            // If atom is simple radical, just return square-root box.
            if (this.DegreeAtom == null)
            {
                return(radicalContainerBox);
            }

            // Atom is complex radical (nth-root).

            // Create box for root atom.
            var rootBox     = this.DegreeAtom.CreateBox(environment.GetRootStyle());
            var bottomShift = scale * (radicalContainerBox.Height + radicalContainerBox.Depth);

            rootBox.Shift = radicalContainerBox.Depth - rootBox.Depth - bottomShift;

            // Create result box.
            var resultBox = new HorizontalBox();

            // Add box for negative kern.
            var negativeKern = new SpaceAtom(TexUnit.Mu, -10, 0, 0).CreateBox(environment);
            var xPos         = rootBox.Width + negativeKern.Width;

            if (xPos < 0)
            {
                resultBox.Add(new StrutBox(-xPos, 0, 0, 0));
            }

            resultBox.Add(rootBox);
            resultBox.Add(negativeKern);
            resultBox.Add(radicalContainerBox);

            return(resultBox);
        }
Esempio n. 8
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        protected override Box CreateBoxCore(TexEnvironment environment)
        {
            var texFont = environment.MathFont;
            var style   = environment.Style;

            // Calculate minimum clearance amount.
            double clearance;
            var    defaultRuleThickness = texFont.GetDefaultLineThickness(style);

            if (style < TexStyle.Text)
            {
                clearance = texFont.GetXHeight(style, texFont.GetCharInfo(sqrtSymbol, style).Value.FontId);
            }
            else
            {
                clearance = defaultRuleThickness;
            }
            clearance = defaultRuleThickness + Math.Abs(clearance) / 4;

            // Create box for base atom, in cramped style.
            var baseBox = this.BaseAtom == null? StrutBox.Empty: this.BaseAtom.CreateBox(environment.GetCrampedStyle());

            // Create box for radical sign.
            var totalHeight    = baseBox.Height + baseBox.Depth;
            var radicalSignBox = DelimiterFactory.CreateBox(sqrtSymbol, totalHeight + clearance + defaultRuleThickness, environment, Source);

            radicalSignBox.Source = Source;

            // Add half of excess height to clearance.
            var delta = radicalSignBox.Depth - (totalHeight + clearance);

            clearance += delta / 2;

            // Create box for root base containing base box.
            var overBar = new OverBar(environment, baseBox, clearance, radicalSignBox.Height)
            {
                Shift = -defaultRuleThickness,
            };

            //Create box to hold the radical and the degree atom(if it exists)
            var radicalContainerBox = new VerticalBox();
            //Create a box for creating a space for the radical sign box's left shift and width
            var horizoverlapbox = new StrutBox(0, 0, 0, 0);

            radicalContainerBox.Add(horizoverlapbox);
            radicalContainerBox.Add(radicalSignBox);

            // Create box for root atom.
            var radrootBox   = this.DegreeAtom == null ?(this.DegreeSpecified? StrutBox.Empty:NullAtom.NullBox) : this.DegreeAtom.CreateBox(environment.GetRootStyle());
            var bottomShift  = scale * (radicalSignBox.Height + radicalSignBox.Depth);
            var rcbItemsdiff = radicalSignBox.TotalHeight - radrootBox.TotalHeight;

            bottomShift      = rcbItemsdiff;
            radrootBox.Shift = 0;
            if (radrootBox.TotalHeight < radicalSignBox.TotalHeight / 2)
            {
                bottomShift = (radicalSignBox.TotalHeight / 2) + radrootBox.TotalHeight;
            }
            var Vnegspace = new StrutBox(0, -bottomShift, 0, 0);

            radicalContainerBox.Add(Vnegspace);
            radicalContainerBox.Add(radrootBox);

            var leftshift = this.DegreeAtom == null? 0: radrootBox.TotalWidth - radicalSignBox.TotalWidth / 2;

            if (radrootBox.TotalWidth < (radicalSignBox.TotalWidth / 2))
            {
                leftshift = 0;
            }
            radicalSignBox.Shift = leftshift;
            //increase the left overlap width
            horizoverlapbox.Width = leftshift + radicalSignBox.Width;

            // Create result box.
            var resultBox = new HorizontalBox();

            resultBox.Add(radicalContainerBox);
            //adjust the vertical shift of the radicalContainerBox
            radicalContainerBox.Shift = -defaultRuleThickness - radicalContainerBox.Depth;
            var leftpad = radicalContainerBox.TotalWidth - radicalSignBox.Shift - radicalSignBox.TotalWidth;

            resultBox.Add(new StrutBox(leftpad, 0, 0, 0));
            overBar.Shift = -defaultRuleThickness - radicalContainerBox.Depth;
            resultBox.Add(overBar);

            return(resultBox);
        }
Esempio n. 9
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        public override Box CreateBox(TexEnvironment environment)
        {
            var texFont = environment.TexFont;
            var style = environment.Style;

            // Create box for base atom.
            var baseBox = (this.BaseAtom == null ? StrutBox.Empty : this.BaseAtom.CreateBox(environment));
            if (this.SubscriptAtom == null && this.SuperscriptAtom == null)
                return baseBox;

            // Create result box.
            var resultBox = new HorizontalBox(baseBox);

            // Get last font used or default Mu font.
            int lastFontId = baseBox.GetLastFontId();
            if (lastFontId == TexFontUtilities.NoFontId)
                lastFontId = texFont.GetMuFontId();

            var subscriptStyle = environment.GetSubscriptStyle();
            var superscriptStyle = environment.GetSuperscriptStyle();

            // Set delta value and preliminary shift-up and shift-down amounts depending on type of base atom.
            var delta = 0d;
            double shiftUp, shiftDown;

            if (this.BaseAtom is AccentedAtom)
            {
                var accentedBox = ((AccentedAtom)this.BaseAtom).BaseAtom.CreateBox(environment.GetCrampedStyle());
                shiftUp = accentedBox.Height - texFont.GetSupDrop(superscriptStyle.Style);
                shiftDown = accentedBox.Depth + texFont.GetSubDrop(subscriptStyle.Style);
            }
            else if (this.BaseAtom is SymbolAtom && this.BaseAtom.Type == TexAtomType.BigOperator)
            {
                var charInfo = texFont.GetCharInfo(((SymbolAtom)this.BaseAtom).Name, style);
                if (style < TexStyle.Text && texFont.HasNextLarger(charInfo))
                    charInfo = texFont.GetNextLargerCharInfo(charInfo, style);
                var charBox = new CharBox(environment, charInfo);

                charBox.Shift = -(charBox.Height + charBox.Depth) / 2 - environment.TexFont.GetAxisHeight(
                    environment.Style);
                resultBox = new HorizontalBox(charBox);

                delta = charInfo.Metrics.Italic;
                if (delta > TexUtilities.FloatPrecision && this.SubscriptAtom == null)
                    resultBox.Add(new StrutBox(delta, 0, 0, 0));

                shiftUp = resultBox.Height - texFont.GetSupDrop(superscriptStyle.Style);
                shiftDown = resultBox.Depth + texFont.GetSubDrop(subscriptStyle.Style);
            }
            else if (this.BaseAtom is CharSymbol)
            {
                var charFont = ((CharSymbol)this.BaseAtom).GetCharFont(texFont);
                if (!((CharSymbol)this.BaseAtom).IsTextSymbol || !texFont.HasSpace(charFont.FontId))
                    delta = texFont.GetCharInfo(charFont, style).Metrics.Italic;
                if (delta > TexUtilities.FloatPrecision && SubscriptAtom == null)
                {
                    resultBox.Add(new StrutBox(delta, 0, 0, 0));
                    delta = 0;
                }

                shiftUp = 0;
                shiftDown = 0;
            }
            else
            {
                shiftUp = baseBox.Height - texFont.GetSupDrop(superscriptStyle.Style);
                shiftDown = baseBox.Depth + texFont.GetSubDrop(subscriptStyle.Style);
            }

            Box superscriptBox = null;
            Box superscriptContainerBox = null;
            Box subscriptBox = null;
            Box subscriptContainerBox = null;

            if (this.SuperscriptAtom != null)
            {
                // Create box for superscript atom.
                superscriptBox = this.SuperscriptAtom.CreateBox(superscriptStyle);
                superscriptContainerBox = new HorizontalBox(superscriptBox);

                // Add box for script space.
                superscriptContainerBox.Add(scriptSpaceAtom.CreateBox(environment));

                // Adjust shift-up amount.
                double p;
                if (style == TexStyle.Display)
                    p = texFont.GetSup1(style);
                else if (environment.GetCrampedStyle().Style == style)
                    p = texFont.GetSup3(style);
                else
                    p = texFont.GetSup2(style);
                shiftUp = Math.Max(Math.Max(shiftUp, p), superscriptBox.Depth + Math.Abs(texFont.GetXHeight(
                    style, lastFontId)) / 4);
            }

            if (this.SubscriptAtom != null)
            {
                // Create box for subscript atom.
                subscriptBox = this.SubscriptAtom.CreateBox(subscriptStyle);
                subscriptContainerBox = new HorizontalBox(subscriptBox);

                // Add box for script space.
                subscriptContainerBox.Add(scriptSpaceAtom.CreateBox(environment));
            }

            // Check if only superscript is set.
            if (subscriptBox == null)
            {
                superscriptContainerBox.Shift = -shiftUp;
                resultBox.Add(superscriptContainerBox);
                return resultBox;
            }

            // Check if only subscript is set.
            if (superscriptBox == null)
            {
                subscriptBox.Shift = Math.Max(Math.Max(shiftDown, texFont.GetSub1(style)), subscriptBox.Height - 4 *
                    Math.Abs(texFont.GetXHeight(style, lastFontId)) / 5);
                resultBox.Add(subscriptContainerBox);
                return resultBox;
            }

            // Adjust shift-down amount.
            shiftDown = Math.Max(shiftDown, texFont.GetSub2(style));

            // Reposition both subscript and superscript.
            double defaultLineThickness = texFont.GetDefaultLineThickness(style);
            // Space between subscript and superscript.
            double scriptsInterSpace = shiftUp - superscriptBox.Depth + shiftDown - subscriptBox.Height;
            if (scriptsInterSpace < 4 * defaultLineThickness)
            {
                shiftUp += 4 * defaultLineThickness - scriptsInterSpace;

                // Position bottom of superscript at least 4/5 of X-height above baseline.
                double psi = 0.8 * Math.Abs(texFont.GetXHeight(style, lastFontId)) - (shiftUp - superscriptBox.Depth);
                if (psi > 0)
                {
                    shiftUp += psi;
                    shiftDown -= psi;
                }
            }
            scriptsInterSpace = shiftUp - superscriptBox.Depth + shiftDown - subscriptBox.Height;

            // Create box containing both superscript and subscript.
            var scriptsBox = new VerticalBox();
            superscriptContainerBox.Shift = delta;
            scriptsBox.Add(superscriptContainerBox);
            scriptsBox.Add(new StrutBox(0, scriptsInterSpace, 0, 0));
            scriptsBox.Add(subscriptContainerBox);
            scriptsBox.Height = shiftUp + superscriptBox.Height;
            scriptsBox.Depth = shiftDown + subscriptBox.Depth;
            resultBox.Add(scriptsBox);

            return resultBox;
        }