private void BuildRects()
{
// Build character rects
var fm = _paint.FontMetrics;
SKTextAlign align = _paint.TextAlign;
for (int li = 0; li < _skiaLines.Count; li++)
{
var line = _skiaLines[li];
float prevRight = TransformX(0, line.Width, align);
double nextTop = line.Top + line.Height;
if (li + 1 < _skiaLines.Count)
{
nextTop = _skiaLines[li + 1].Top;
}
for (int i = line.Start; i < line.Start + line.TextLength; i++)
{
float w = _paint.MeasureText(Text[i].ToString());
_rects.Add(new Rect(
prevRight,
line.Top,
w,
nextTop - line.Top));
prevRight += w;
}
}
}
/// <summary>
/// Draws a bitmap to the document and returns the height of the drawing,
/// excluding the <paramref name="paddingBottom"/>.
/// </summary>
/// <param name="bitmap">The bitmap to draw onto the document.</param>
/// <param name="align">The image alignment.</param>
/// <param name="width">The desired width of the drawing.</param>
/// <param name="height">The desired height of the drawing.</param>
/// <param name="paddingBottom">Adds additional vertical "whitespace" below the bitmap.</param>
private static float DrawBitmap(SKBitmap bitmap, SKTextAlign align, float width, float height, float paddingBottom = 15f)
{
CheckAndTriggerPageBreak(height);
float imgXPos;
switch (align)
{
case SKTextAlign.Left:
default:
imgXPos = MARGIN_LEFT;
break;
case SKTextAlign.Center:
imgXPos = PAGE_WIDTH / 2 - width / 2;
break;
case SKTextAlign.Right:
imgXPos = PAGE_WIDTH - MARGIN_LEFT - width;
break;
}
SKRect rect = new SKRect(imgXPos, _yPos, imgXPos + width, _yPos + height);
_canvas.DrawBitmap(bitmap, rect);
_yPos += height + paddingBottom;
return(rect.Height);
}
private void BuildRects()
{
// Build character rects
SKTextAlign align = _paint.TextAlign;
for (int li = 0; li < _skiaLines.Count; li++)
{
var line = _skiaLines[li];
float prevRight = TransformX(0, line.Width, align);
double nextTop = line.Top + line.Height;
if (li + 1 < _skiaLines.Count)
{
nextTop = _skiaLines[li + 1].Top;
}
for (int i = line.Start; i < line.Start + line.TextLength; i++)
{
var w = line.IsEmptyTrailingLine ? 0 : _advances[i];
_rects.Add(new Rect(
prevRight,
line.Top,
w,
nextTop - line.Top));
prevRight += w;
}
}
}
public static void DrawToBottom(SKCanvas c, BaseIcon icon, SKTextAlign align, string text)
{
if (string.IsNullOrEmpty(text))
{
return;
}
using (var paint = new SKPaint
{
IsAntialias = true,
FilterQuality = SKFilterQuality.High,
Typeface = ChicTypefaces.BurbankBigRegularBlack,
TextSize = icon.Height * (align == SKTextAlign.Left ? BOTTOM_TEXT_SIZE_RATIO : ChicRatios.Get(30)),
Color = SKColors.White,
TextAlign = align
})
{
var five = (int)(icon.Height * ChicRatios.Get(5));
if (align == SKTextAlign.Left)
{
c.DrawText(text, five, icon.Height - five, paint);
}
else
{
c.DrawText(text, icon.Width - five - (int)(icon.Height * ChicRatios.Get(27.5f)), icon.Height - five, paint);
}
}
}
public StaticLayout(string source, SKPaint paint, int width, SKTextAlign alignment)
{
this.source = source;
this.paint = paint;
this.width = width;
this.alignment = alignment;
paint.MeasureText(source, ref this.textRect);
paint.GetFontMetrics(out fontMetrics);
}
public override void Draw(Diagram diagram)
{
// Select text alignment.
int aVal = (int)Alignment;
SKTextAlign alignment = SKTextAlign.Left;
if (aVal % 3 == 2)
{
alignment = SKTextAlign.Right;
}
if (aVal % 3 == 1)
{
alignment = SKTextAlign.Center;
}
// Paint and style.
SKFontStyle style = new SKFontStyle(
Bold ? SKFontStyleWeight.Bold : SKFontStyleWeight.Normal,
SKFontStyleWidth.Normal,
Italic ? SKFontStyleSlant.Italic : SKFontStyleSlant.Upright
);
SKPaint paint = new SKPaint
{
Color = Colour,
IsAntialias = true,
Typeface = SKTypeface.FromFamilyName(FontFamily, style),
TextAlign = alignment,
TextSize = FontSize
};
TextWidth *= (paint.FontMetrics.MaxCharacterWidth / FontSize); // Compensation of font width.
// Vertical alignment compensation.
string[] lines = Content.Split(new string[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries);
float comp = FontSize / 2;
if (aVal < 3)
{
comp = FontSize;
}
else if (aVal > 5)
{
comp = 0;
}
for (int i = 0; i < lines.Length; i++)
{
diagram.DiagramSurface.Canvas.DrawText(lines[i], X, Y + comp + (i * FontSize), paint);
}
paint.Dispose();
}
public StaticLayout(string source, SKPaint paint, int width, SKTextAlign alignment)
{
this.source = source;
this.paint = paint;
this.width = width;
this.alignment = alignment;
paint.MeasureText("A,", ref this.highestLetterRect);
paint.MeasureText(source, ref this.textRect);
this.verticalInset = (float)(highestLetterRect.Height - this.textRect.Height);
}
public static TextAlignment ToAvalonia(this SKTextAlign a)
{
switch (a)
{
default:
case SKTextAlign.Left: return(TextAlignment.Left);
case SKTextAlign.Center: return(TextAlignment.Center);
case SKTextAlign.Right: return(TextAlignment.Right);
}
}
static public StringAlignment ToStringAlignment(this SKTextAlign align)
{
switch (align)
{
case SKTextAlign.Left:
return(StringAlignment.Near);
case SKTextAlign.Right:
return(StringAlignment.Far);
default:
return(StringAlignment.Center);
}
}
public static AM.TextAlignment ToTextAlignment(this SKTextAlign textAlign)
{
switch (textAlign)
{
default:
case SKTextAlign.Left:
return(AM.TextAlignment.Left);
case SKTextAlign.Center:
return(AM.TextAlignment.Center);
case SKTextAlign.Right:
return(AM.TextAlignment.Right);
}
}
/// <summary>
/// Convert Mapsforge Align to Skia SKTextAlign
/// </summary>
/// <param name="align">Mapsforge Align</param>
/// <returns>Skia SKTextAlign</returns>
public static SKTextAlign ToSkia(this Align align)
{
SKTextAlign result = SKTextAlign.Center;
if (align == Align.Left)
{
result = SKTextAlign.Left;
}
if (align == Align.Right)
{
result = SKTextAlign.Right;
}
return(result);
}
public StaticLayout get(int width, SKTextAlign alignment, string source, SKPaint paint)
{
if (this.layout == null || this.width != width || this.alignment != alignment || !this.source.Equals(source) || !this.paint.Equals(paint))
{
if (this.layout != null)
{
this.layout.Dispose();
}
this.width = width;
this.alignment = alignment;
this.source = source;
this.paint = paint;
this.layout = new StaticLayout(source, paint, width, alignment);
}
return(this.layout);
}
public void DrawText(Point point, string text, Color color, Font font)
{
if (text is null)
{
return;
}
SKTextAlign ta = new SKTextAlign();
if (font.HorizontalAlignment == Renderable.HorizontalAlignment.Left)
{
ta = SKTextAlign.Left;
}
else if (font.HorizontalAlignment == Renderable.HorizontalAlignment.Center)
{
ta = SKTextAlign.Center;
}
else if (font.HorizontalAlignment == Renderable.HorizontalAlignment.Right)
{
ta = SKTextAlign.Right;
}
var paint = new SKPaint
{
Color = Convert(color),
Typeface = SKTypeface.FromFamilyName(font.Name),
TextSize = font.Size,
TextAlign = ta,
IsAntialias = true
};
var bounds = new SKRect();
paint.MeasureText(text, ref bounds);
if (font.VerticalAlignment == Renderable.VerticalAlignment.Top)
{
point.Y += bounds.Height;
}
else if (font.VerticalAlignment == Renderable.VerticalAlignment.Center)
{
point.Y += bounds.Height / 2;
}
Canvas.DrawText(text, Convert(point), paint);
}
//[InlineData(SKTextAlign.Center)]
//[InlineData(SKTextAlign.Right)]
public void DrawTextBlobIsTheSameAsDrawText(SKTextAlign align)
{
var info = new SKImageInfo(300, 300);
var text = "SkiaSharp";
byte[] textPixels;
using (var bmp = new SKBitmap(info))
using (var canvas = new SKCanvas(bmp))
using (var paint = new SKPaint())
{
paint.TextSize = 50;
paint.TextAlign = align;
canvas.Clear(SKColors.White);
canvas.DrawText(text, 150, 175, paint);
textPixels = bmp.Bytes;
}
byte[] glyphsPixels;
using (var bmp = new SKBitmap(info))
using (var canvas = new SKCanvas(bmp))
using (var paint = new SKPaint())
{
ushort[] glyphs;
using (var glyphsp = new SKPaint())
glyphs = glyphsp.GetGlyphs(text);
paint.TextSize = 50;
paint.TextAlign = align;
paint.TextEncoding = SKTextEncoding.GlyphId;
canvas.Clear(SKColors.White);
using (var builder = new SKTextBlobBuilder())
{
builder.AddRun(paint, 0, 0, glyphs);
canvas.DrawText(builder.Build(), 150, 175, paint);
}
glyphsPixels = bmp.Bytes;
}
Assert.Equal(textPixels, glyphsPixels);
}
public static void DrawToBottom(SKCanvas c, BaseIcon icon, SKTextAlign align, string text)
{
if (string.IsNullOrEmpty(text))
{
return;
}
using (var paint = new SKPaint {
FilterQuality = SKFilterQuality.High, IsAntialias = true, Typeface = ChicTypefaces.BurbankBigRegularBlack, TextSize = BOTTOM_TEXT_SIZE, TextAlign = align, Color = SKColors.White
})
if (align == SKTextAlign.Left)
{
c.DrawText(text, 5, icon.Height - 7, paint);
}
else
{
c.DrawText(text, icon.Width - 5, icon.Height - 7, paint);
}
}
private float TransformX(float originX, float lineWidth, SKTextAlign align)
{
float x = 0;
if (align == SKTextAlign.Left)
{
x = originX;
}
else
{
double width = Constraint.Width > 0 && !double.IsPositiveInfinity(Constraint.Width) ?
Constraint.Width :
_bounds.Width;
switch (align)
{
case SKTextAlign.Center: x = originX + (float)(width - lineWidth) / 2; break;
case SKTextAlign.Right: x = originX + (float)(width - lineWidth); break;
}
}
return(x);
}
public SKText(SKTextAlign textAlign)
{
TextAlign = textAlign;
}
/// <summary>
/// Gets the absolute bounds of a given rectangle, aligned at a given position.
/// </summary>
/// <param name="x">The absolute x position.</param>
/// <param name="y">The absolute y position.</param>
/// <param name="bounds">The bounds of the rectangle.</param>
/// <param name="horizontalAlignment">The alignment of the rectangle, relative to x/y.</param>
/// <returns></returns>
private static SKRect GetAbsolutePositionRect(float x, float y, SKRect bounds, SKTextAlign horizontalAlignment)
{
var captionBounds = new SKRect
{
Left = x + bounds.Left,
Top = y + bounds.Top
};
switch (horizontalAlignment)
{
case SKTextAlign.Left:
captionBounds.Right = captionBounds.Left + bounds.Width;
break;
case SKTextAlign.Center:
captionBounds.Right = captionBounds.Left + bounds.Width / 2;
break;
case SKTextAlign.Right:
captionBounds.Right = captionBounds.Left - bounds.Width;
break;
}
captionBounds.Bottom = captionBounds.Top + bounds.Height;
return(captionBounds);
}
private float TransformX(float originX, float lineWidth, SKTextAlign align)
{
float x = 0;
if (align == SKTextAlign.Left)
{
x = originX;
}
else
{
double width = Constraint.Width > 0 && !double.IsPositiveInfinity(Constraint.Width) ?
Constraint.Width :
_size.Width;
switch (align)
{
case SKTextAlign.Center: x = originX + (float)(width - lineWidth) / 2; break;
case SKTextAlign.Right: x = originX + (float)(width - lineWidth); break;
}
}
return x;
}
public static void DrawCaptionLabels(this SKCanvas canvas, string label, SKColor labelColor, string value, SKColor valueColor, float textSize, SKPoint point, SKTextAlign horizontalAlignment, SKTypeface typeface)
{
var hasLabel = !string.IsNullOrEmpty(label);
var hasValueLabel = !string.IsNullOrEmpty(value);
if (hasLabel || hasValueLabel)
{
var hasOffset = hasLabel && hasValueLabel;
var captionMargin = textSize * 0.60f;
var space = hasOffset ? captionMargin : 0;
if (hasLabel)
{
using (var paint = new SKPaint()
{
TextSize = textSize,
IsAntialias = true,
Color = labelColor,
IsStroke = false,
TextAlign = horizontalAlignment,
Typeface = typeface
})
{
var bounds = new SKRect();
var text = label;
paint.MeasureText(text, ref bounds);
var y = point.Y - ((bounds.Top + bounds.Bottom) / 2) - space;
canvas.DrawText(text, point.X, y, paint);
}
}
if (hasValueLabel)
{
using (var paint = new SKPaint()
{
TextSize = textSize,
IsAntialias = true,
FakeBoldText = true,
Color = valueColor,
IsStroke = false,
TextAlign = horizontalAlignment,
Typeface = typeface
})
{
var bounds = new SKRect();
var text = value;
paint.MeasureText(text, ref bounds);
var y = point.Y - ((bounds.Top + bounds.Bottom) / 2) + space;
canvas.DrawText(text, point.X, y, paint);
}
}
}
}
public static void DrawCaptionLabels(this SKCanvas canvas, string label, SKColor labelColor, TextDirection textDirection, float labelTextSpacing, string value, SKColor valueColor, float textSize, SKPoint point, SKTextAlign horizontalAlignment, SKTypeface typeface, out SKRect totalBounds)
{
var hasLabel = !string.IsNullOrEmpty(label);
var hasValueLabel = !string.IsNullOrEmpty(value);
totalBounds = new SKRect();
if (hasLabel || hasValueLabel)
{
var hasOffset = hasLabel && hasValueLabel;
var captionMargin = textSize * 0.60f;
var space = hasOffset ? captionMargin : 0;
if (hasLabel)
{
using (var paint = new SKPaint
{
TextSize = textSize,
IsAntialias = true,
Color = labelColor,
IsStroke = false,
TextAlign = horizontalAlignment,
Typeface = typeface
})
{
var bounds = new SKRect();
var text = label;
paint.MeasureText(text, ref bounds);
var y = point.Y - ((bounds.Top + bounds.Bottom) / 2) - space;
RichString rs;
if (typeface != null)
{
rs = new RichString()
.FontFamily(typeface.FamilyName)
.FontSize(textSize)
.LetterSpacing(labelTextSpacing)
.TextColor(labelColor)
.TextDirection(textDirection)
.Add(text);
}
else
{
rs = new RichString()
.FontSize(textSize)
.LetterSpacing(labelTextSpacing)
.TextColor(labelColor)
.TextDirection(textDirection)
.Add(text);
}
rs.Paint(canvas, new SKPoint(point.X, y), new TextPaintOptions
{
IsAntialias = true,
LcdRenderText = true
});
var labelBounds = GetAbsolutePositionRect(point.X, y, bounds, horizontalAlignment);
totalBounds = labelBounds.Standardized;
}
}
if (hasValueLabel)
{
using (var paint = new SKPaint()
{
TextSize = textSize,
IsAntialias = true,
FakeBoldText = true,
Color = valueColor,
IsStroke = false,
TextAlign = horizontalAlignment,
Typeface = typeface
})
{
var bounds = new SKRect();
var text = value;
paint.MeasureText(text, ref bounds);
var y = point.Y - ((bounds.Top + bounds.Bottom) / 2) + space;
canvas.DrawText(text, point.X, y, paint);
var valueBounds = GetAbsolutePositionRect(point.X, y, bounds, horizontalAlignment);
if (totalBounds.IsEmpty)
{
totalBounds = valueBounds;
}
else
{
totalBounds.Union(valueBounds);
}
}
}
}
}
public static SKPaint CreateTextPaint(double fontSize, double width, Color color, SKTextAlign textAlign = SKTextAlign.Left)
{
var paint = new SKPaint
{
Style = SKPaintStyle.Fill,
Color = color.ToSKColor(),
StrokeWidth = (float)width,
TextSize = (float)fontSize,
TextAlign = textAlign,
SubpixelText = true,
IsAntialias = true,
};
return(paint);
}
// AddPathPositionedRun
public void AddPathPositionedRun(ReadOnlySpan <ushort> glyphs, SKFont font, ReadOnlySpan <float> glyphWidths, ReadOnlySpan <SKPoint> glyphOffsets, SKPath path, SKTextAlign textAlign = SKTextAlign.Left)
{
using var pathMeasure = new SKPathMeasure(path);
var contourLength = pathMeasure.Length;
var textLength = glyphOffsets[glyphs.Length - 1].X + glyphWidths[glyphs.Length - 1];
var alignment = (int)textAlign * 0.5f;
var startOffset = glyphOffsets[0].X + (contourLength - textLength) * alignment;
var firstGlyphIndex = 0;
var pathGlyphCount = 0;
using var glyphTransforms = Utils.RentArray <SKRotationScaleMatrix> (glyphs.Length);
// TODO: deal with multiple contours?
for (var index = 0; index < glyphOffsets.Length; index++)
{
var glyphOffset = glyphOffsets[index];
var halfWidth = glyphWidths[index] * 0.5f;
var pathOffset = startOffset + glyphOffset.X + halfWidth;
// TODO: clip glyphs on both ends of paths
if (pathOffset >= 0 && pathOffset < contourLength && pathMeasure.GetPositionAndTangent(pathOffset, out var position, out var tangent))
{
if (pathGlyphCount == 0)
{
firstGlyphIndex = index;
}
var tx = tangent.X;
var ty = tangent.Y;
var px = position.X;
var py = position.Y;
// horizontally offset the position using the tangent vector
px -= tx * halfWidth;
py -= ty * halfWidth;
// vertically offset the position using the normal vector (-ty, tx)
var dy = glyphOffset.Y;
px -= dy * ty;
py += dy * tx;
glyphTransforms.Span[pathGlyphCount++] = new SKRotationScaleMatrix(tx, ty, px, py);
}
}
var glyphSubset = glyphs.Slice(firstGlyphIndex, pathGlyphCount);
var positions = glyphTransforms.Span.Slice(0, pathGlyphCount);
AddRotationScaleRun(glyphSubset, font, positions);
}
public static SKPaint CreateTextPaint(SKTypeface font, int fontsize, SKColor color, SKTextAlign align = SKTextAlign.Left)
{
return(new SKPaint {
Color = color,
Typeface = font,
IsAntialias = true,
LcdRenderText = true,
TextSize = fontsize,
SubpixelText = true,
DeviceKerningEnabled = true,
FilterQuality = SKFilterQuality.High,
HintingLevel = SKPaintHinting.Full,
IsAutohinted = true,
TextAlign = align,
TextEncoding = SKTextEncoding.Utf32,
IsLinearText = true
});
}
public SKText(SKPoint location, SKTextAlign textAlign)
{
Location = location;
TextAlign = textAlign;
}
internal static SKTextBlob CreatePathPositioned(void *text, int length, SKTextEncoding encoding, SKFont font, SKPath path, SKTextAlign textAlign = SKTextAlign.Left, SKPoint origin = default)
{
if (font == null)
{
throw new ArgumentNullException(nameof(font));
}
var count = font.CountGlyphs(text, length, encoding);
if (count <= 0)
{
return(null);
}
// we use temporary arrays because we might only use part of the text
using var glyphs = Utils.RentArray <ushort> (count);
using var glyphWidths = Utils.RentArray <float> (glyphs.Length);
using var glyphOffsets = Utils.RentArray <SKPoint> (glyphs.Length);
font.GetGlyphs(text, length, encoding, glyphs);
font.GetGlyphWidths(glyphs, glyphWidths, Span <SKRect> .Empty);
font.GetGlyphPositions(glyphs, glyphOffsets, origin);
using var builder = new SKTextBlobBuilder();
builder.AddPathPositionedRun(glyphs, font, glyphWidths, glyphOffsets, path, textAlign);
return(builder.Build());
}
public extern static void sk_paint_set_text_align(sk_paint_t t, SKTextAlign align);
public extern static void sk_paint_set_text_align(sk_paint_t t, SKTextAlign align);
private SKText ReadTextSpans(XElement e, SKPoint xy, SKTextAlign textAlign, float baselineShift, SKPaint stroke, SKPaint fill)
{
var spans = new SKText(xy, textAlign);
// textAlign is used for all spans within the <text> element. If different textAligns would be needed, it is necessary to use
// several <text> elements instead of <tspan> elements
var currentBaselineShift = baselineShift;
fill.TextAlign = SKTextAlign.Left; // fixed alignment for all spans
var nodes = e.Nodes().ToArray();
for (int i = 0; i < nodes.Length; i++)
{
var c = nodes[i];
bool isFirst = i == 0;
bool isLast = i == nodes.Length - 1;
if (c.NodeType == XmlNodeType.Text)
{
// TODO: check for preserve whitespace
var textSegments = ((XText)c).Value.Split(new[] { '\n', '\r' }, StringSplitOptions.RemoveEmptyEntries);
var count = textSegments.Length;
if (count > 0)
{
if (isFirst)
{
textSegments[0] = textSegments[0].TrimStart();
}
if (isLast)
{
textSegments[count - 1] = textSegments[count - 1].TrimEnd();
}
var text = WSRe.Replace(string.Concat(textSegments), " ");
spans.Append(new SKTextSpan(text, fill.Clone(), baselineShift: currentBaselineShift));
}
}
else if (c.NodeType == XmlNodeType.Element)
{
var ce = (XElement)c;
if (ce.Name.LocalName == "tspan")
{
// the current span may want to change the cursor position
var x = ReadOptionalNumber(ce.Attribute("x"));
var y = ReadOptionalNumber(ce.Attribute("y"));
var text = ce.Value; //.Trim();
var spanFill = fill.Clone();
ReadFontAttributes(ce, spanFill);
// Don't read text-anchor from tspans!, Only use enclosing text-anchor from text element!
currentBaselineShift = ReadBaselineShift(ce);
spans.Append(new SKTextSpan(text, spanFill, x, y, currentBaselineShift));
}
}
}
return(spans);
}
public static void DrawHorizontalText(this SKCanvas canvas, string text, float x, float y, float textSize, SKColor textColor, SKTextAlign textAlign, bool isBold = false)
{
using (var paint = new SKPaint())
{
paint.TextSize = textSize;
paint.Color = textColor;
paint.IsAntialias = true;
paint.FakeBoldText = isBold;
var bounds = new SKRect();
paint.MeasureText(text, ref bounds);
if (textAlign == SKTextAlign.Left)
{
x -= bounds.Width;
}
else if (textAlign == SKTextAlign.Right)
{
x += bounds.Width / 2;
}
else
{
paint.TextAlign = SKTextAlign.Center;
}
canvas.DrawText(text, x, y, paint);
}
}
public static void DrawCenteredMultilineText(SKCanvas canvas, string text, int maxLineCount, BaseIcon icon, SKTextAlign side, SKRect area, SKPaint paint) => DrawCenteredMultilineText(canvas, text, maxLineCount, icon.Width, 5, side, area, paint);
public static void DrawCenteredMultilineText(SKCanvas canvas, string text, int maxLineCount, int size, int margin, SKTextAlign align, SKRect area, SKPaint paint)
{
float lineHeight = paint.TextSize * 1.2f;
List <Line> lines = SplitLines(text, paint, area.Width - margin);
if (lines == null)
{
return;
}
if (lines.Count <= maxLineCount)
{
maxLineCount = lines.Count;
}
float height = maxLineCount * lineHeight;
float y = area.MidY - height / 2;
for (int i = 0; i < maxLineCount; i++)
{
Line line = lines[i];
y += lineHeight;
float x = align switch
{
SKTextAlign.Center => area.MidX - line.Width / 2,
SKTextAlign.Right => size - margin - line.Width,
SKTextAlign.Left => margin,
_ => area.MidX - line.Width / 2
};
string lineText = line.Value.TrimEnd();
canvas.DrawText(lineText, x, y, paint);
}
}
){kind=link}