float GetBaselineInWorldSpace(FontMetricsHolder fmh)
{
FontMetricsHolder.Metrics metrics;
float fontScale;
if (UniformStyle)
{
fontScale = CurrentFontSize;
metrics = fmh.GlyphRunMetrics[0];
}
else
{
// Baseline is decided from whichever is the larger font selection.
if (GetGlyphSize(CurrentUppercaseFontSize, fmh.GlyphRunMetrics[0]) > GetGlyphSize(CurrentLowercaseFontSize, fmh.GlyphRunMetrics[fmh.GlyphRunMetrics.Count - 1]))
{
fontScale = CurrentUppercaseFontSize;
metrics = fmh.GlyphRunMetrics[0];
}
else
{
fontScale = CurrentLowercaseFontSize;
metrics = fmh.GlyphRunMetrics[fmh.GlyphRunMetrics.Count - 1];
}
}
return((float)textLayout.LayoutBounds.Top + (fontScale * (metrics.Ascent + metrics.LineGap)));
}
private void Canvas_Draw(CanvasControl sender, CanvasDrawEventArgs args)
{
args.DrawingSession.Transform = System.Numerics.Matrix3x2.CreateTranslation(0, 5);
EnsureResources(sender, sender.Size);
FontMetricsHolder fmh = new FontMetricsHolder(args.DrawingSession);
textLayout.DrawToTextRenderer(fmh, new System.Numerics.Vector2(0, 0));
args.DrawingSession.DrawTextLayout(textLayout, 0, 0, Colors.White);
if (ShowGlyphRunBounds)
{
foreach (var metrics in fmh.GlyphRunMetrics)
{
args.DrawingSession.DrawRectangle(metrics.Bounds, Colors.Cyan);
}
}
float baselineInWorldSpace = (float)textLayout.LayoutBounds.Top + textLayout.LineMetrics[0].Baseline;
Labeler.DrawBaseline(args.DrawingSession, sender.Size.ToVector2(), baselineInWorldSpace);
if (UniformStyle)
{
Labeler l = new Labeler(CurrentFontSize, sizeDim, sender.Size.ToVector2(), textLayout.LayoutBounds, baselineInWorldSpace, fmh.GlyphRunMetrics[0], args.DrawingSession);
l.DrawAscent();
l.DrawLineGap();
l.DrawDescent();
l.DrawCapitalHeight();
l.DrawLowercaseHeight();
}
else
{
Labeler l1 = new Labeler(CurrentUppercaseFontSize, sizeDim, sender.Size.ToVector2(), textLayout.LayoutBounds, baselineInWorldSpace, fmh.GlyphRunMetrics[0], args.DrawingSession);
l1.DrawLineGap();
l1.DrawCapitalHeight();
l1.DrawAscent();
Labeler l2 = new Labeler(CurrentLowercaseFontSize, sizeDim, sender.Size.ToVector2(), textLayout.LayoutBounds, baselineInWorldSpace, fmh.GlyphRunMetrics[fmh.GlyphRunMetrics.Count - 1], args.DrawingSession);
l2.DrawLineGap();
l2.DrawLowercaseHeight();
l2.DrawDescent();
}
}
private void Canvas_Draw(CanvasControl sender, CanvasDrawEventArgs args)
{
args.DrawingSession.Transform = System.Numerics.Matrix3x2.CreateTranslation(0, 5);
EnsureResources(sender, sender.Size);
FontMetricsHolder fmh = new FontMetricsHolder(args.DrawingSession);
textLayout.DrawToTextRenderer(fmh, new System.Numerics.Vector2(0, 0));
args.DrawingSession.DrawTextLayout(textLayout, 0, 0, Colors.White);
if (ShowGlyphRunBounds)
{
foreach (var metrics in fmh.GlyphRunMetrics)
{
args.DrawingSession.DrawRectangle(metrics.Bounds, Colors.Cyan);
}
}
float baselineInWorldSpace = (float)textLayout.LayoutBounds.Top + textLayout.LineMetrics[0].Baseline;
Labeler.DrawBaseline(args.DrawingSession, sender.Size.ToVector2(), baselineInWorldSpace);
if (UniformStyle)
{
Labeler l = new Labeler(CurrentFontSize, sizeDim, sender.Size.ToVector2(), textLayout.LayoutBounds, baselineInWorldSpace, fmh.GlyphRunMetrics[0], args.DrawingSession);
l.DrawAscent();
l.DrawLineGap();
l.DrawDescent();
l.DrawCapitalHeight();
l.DrawLowercaseHeight();
}
else
{
Labeler l1 = new Labeler(CurrentUppercaseFontSize, sizeDim, sender.Size.ToVector2(), textLayout.LayoutBounds, baselineInWorldSpace, fmh.GlyphRunMetrics[0], args.DrawingSession);
l1.DrawLineGap();
l1.DrawCapitalHeight();
l1.DrawAscent();
Labeler l2 = new Labeler(CurrentLowercaseFontSize, sizeDim, sender.Size.ToVector2(), textLayout.LayoutBounds, baselineInWorldSpace, fmh.GlyphRunMetrics[fmh.GlyphRunMetrics.Count - 1], args.DrawingSession);
l2.DrawLineGap();
l2.DrawLowercaseHeight();
l2.DrawDescent();
}
}
public Labeler(float f, float sd, Vector2 l, Rect tlb, float b, FontMetricsHolder.Metrics m, CanvasDrawingSession ds)
{
fontSize = f;
sizeDim = sd;
layoutSize = l;
textLayoutBounds = tlb;
baselineInWorldSpace = b;
glyphRunMetrics = m;
drawingSession = ds;
horizontalMidpoint = (layoutSize.X / 2);
leftJustifiedTextFormat = new CanvasTextFormat()
{
VerticalAlignment = CanvasVerticalAlignment.Top,
HorizontalAlignment = CanvasHorizontalAlignment.Left
};
rightJustifiedTextFormat = new CanvasTextFormat()
{
VerticalAlignment = CanvasVerticalAlignment.Top,
HorizontalAlignment = CanvasHorizontalAlignment.Right
};
NextLabel();
}
float GetGlyphSize(float fontSize, FontMetricsHolder.Metrics metrics)
{
//
// This isn't a universally reliable way of determining baseline height
// within a layout, but it's fine for this demo- since we've got no inline objects,
// horizontal text and no custom line spacing.
//
return fontSize * (metrics.Ascent + metrics.LineGap);
}
float GetBaselineInWorldSpace(FontMetricsHolder fmh)
{
FontMetricsHolder.Metrics metrics;
float fontScale;
if (UniformStyle)
{
fontScale = CurrentFontSize;
metrics = fmh.GlyphRunMetrics[0];
}
else
{
// Baseline is decided from whichever is the larger font selection.
if (GetGlyphSize(CurrentUppercaseFontSize, fmh.GlyphRunMetrics[0]) > GetGlyphSize(CurrentLowercaseFontSize, fmh.GlyphRunMetrics[fmh.GlyphRunMetrics.Count - 1]))
{
fontScale = CurrentUppercaseFontSize;
metrics = fmh.GlyphRunMetrics[0];
}
else
{
fontScale = CurrentLowercaseFontSize;
metrics = fmh.GlyphRunMetrics[fmh.GlyphRunMetrics.Count - 1];
}
}
return (float)textLayout.LayoutBounds.Top + (fontScale * (metrics.Ascent + metrics.LineGap));
}
