protected override IMAGE32 Evaluate()
{
if (FontFamily == null)
{
return(null);
}
if (Size <= 0)
{
return(null);
}
var font = new SixLabors.Fonts.Font(FontFamily, Size);
var context = new SixLabors.Fonts.RendererOptions(font);
var characters = "0123456789ABCDEFGHIJKLM";
var padding = new Size(this.Padding, this.Padding);
var cellSize = context.GetGlypthMaxBounds(characters.ToCharArray()).OuterRound().Size;
cellSize += padding * 2;
var image = ImageFactory.CreateImage <Rgba32>(cellSize * 16);
foreach (var c in characters.ToArray())
{
_DrawGlyph(image, cellSize, padding, context, c);
}
return(image);
}
public void DrawTextCoreOld()
{
using (var image = new Image <Rgba32>(800, 800))
{
Fonts.Font font = Fonts.SystemFonts.CreateFont("Arial", 12);
image.Mutate(
x => DrawTextOldVersion(
x,
new TextGraphicsOptions {
GraphicsOptions = { Antialias = true }, TextOptions = { WrapTextWidth = 780 }
},
this.TextToRender,
font,
null,
Processing.Pens.Solid(Color.HotPink, 10),
new PointF(10, 10)));
}
IImageProcessingContext DrawTextOldVersion(
IImageProcessingContext source,
TextGraphicsOptions options,
string text,
SixLabors.Fonts.Font font,
IBrush brush,
IPen pen,
PointF location)
{
var style = new SixLabors.Fonts.RendererOptions(font, options.TextOptions.DpiX, options.TextOptions.DpiY, location)
{
ApplyKerning = options.TextOptions.ApplyKerning,
TabWidth = options.TextOptions.TabWidth,
WrappingWidth = options.TextOptions.WrapTextWidth,
HorizontalAlignment = options.TextOptions.HorizontalAlignment,
VerticalAlignment = options.TextOptions.VerticalAlignment
};
IPathCollection glyphs = TextBuilder.GenerateGlyphs(text, style);
var pathOptions = new ShapeGraphicsOptions()
{
GraphicsOptions = options.GraphicsOptions
};
if (brush != null)
{
source.Fill(pathOptions, brush, glyphs);
}
if (pen != null)
{
source.Draw(pathOptions, pen, glyphs);
}
return(source);
}
}
// https://docs.microsoft.com/es-es/typography/opentype/spec/ttch01
public static void TestGlyph()
{
var family = SixLabors.Fonts.SystemFonts.Find("arial");
var font = new SixLabors.Fonts.Font(family, 50);
var roptions = new SixLabors.Fonts.RendererOptions(font, 96);
var size1 = SixLabors.Fonts.TextMeasurer.Measure("f", roptions);
var size2 = SixLabors.Fonts.TextMeasurer.Measure("g", roptions);
}
public static void DrawGlypth(this Image <Rgba32> target, SixLabors.Fonts.RendererOptions options, int x, int y, char character)
{
var origin = new PointF(x, y);
// origin += new SizeF(0.5f, 0.5f);
var path = options
.GetCharacterGlypth(character)
.Translate(origin);
target.Mutate(dc => dc.Fill(Rgba32.White, path));
}
// https://github.com/SixLabors/Fonts/issues/57
public static RectangleF GetGlypthMaxBounds(this SixLabors.Fonts.RendererOptions options, params char[] characters)
{
var rect = new SixLabors.Primitives.RectangleF(float.PositiveInfinity, float.PositiveInfinity, float.NegativeInfinity, float.NegativeInfinity);
foreach (var c in characters)
{
var r = options.GetCharacterGlypth(c).Bounds;
rect = rect.IsInitialized() ? rect.UnionWith(r) : r;
}
return(rect);
}
public void DrawTextCoreOld()
{
using (var image = new Image <Rgba32>(800, 800))
{
var font = SixLabors.Fonts.SystemFonts.CreateFont("Arial", 12);
image.Mutate(x => DrawTextOldVersion(x, new TextGraphicsOptions(true)
{
WrapTextWidth = 780
}, TextToRender, font, Processing.Brushes.Solid(Rgba32.HotPink), null, new SixLabors.Primitives.PointF(10, 10)));
}
IImageProcessingContext DrawTextOldVersion(
IImageProcessingContext source,
TextGraphicsOptions options,
string text,
SixLabors.Fonts.Font font,
IBrush brush,
IPen pen,
SixLabors.Primitives.PointF location)
{
float dpiX = 72;
float dpiY = 72;
var style = new SixLabors.Fonts.RendererOptions(font, dpiX, dpiY, location)
{
ApplyKerning = options.ApplyKerning,
TabWidth = options.TabWidth,
WrappingWidth = options.WrapTextWidth,
HorizontalAlignment = options.HorizontalAlignment,
VerticalAlignment = options.VerticalAlignment
};
Shapes.IPathCollection glyphs = Shapes.TextBuilder.GenerateGlyphs(text, style);
var pathOptions = (GraphicsOptions)options;
if (brush != null)
{
source.Fill(pathOptions, brush, glyphs);
}
if (pen != null)
{
source.Draw(pathOptions, pen, glyphs);
}
return(source);
}
}
public SizeF MeasureString(String text, Font font, int width, StringFormat format)
{
SixLabors.Fonts.FontFamily family = SixLabors.Fonts.SystemFonts.Find(font.Name);
//font.Bold
//font.Italic
//font.Underline
//font.Strikeout
SixLabors.Fonts.Font fo = new SixLabors.Fonts.Font(family, font.Size);
SixLabors.Fonts.RendererOptions ro = new SixLabors.Fonts.RendererOptions(fo);
SixLabors.Primitives.SizeF result = SixLabors.Fonts.TextMeasurer.Measure(text, ro);
return(new System.Drawing.SizeF(result.Width, result.Height));
}
public static Image <Rgba32> CreateGlyphImage(this SixLabors.Fonts.Font font, Char character, Rgba32 foreground)
{
var options = TextGraphicsOptions.Default;
var text = character.ToString();
var roptions = new SixLabors.Fonts.RendererOptions(font, 96);
var size = SixLabors.Fonts.TextMeasurer.Measure(text, roptions);
int w = (int)Math.Ceiling(size.Width);
int h = (int)Math.Ceiling(size.Height);
var img = new Image <Rgba32>(w, h);
img.Mutate(dc => dc.DrawText(options, text, font, foreground, System.Numerics.Vector2.Zero));
return(img);
}
public static IMAGE32 RenderText(this SixLabors.Fonts.FontFamily ffamily, string text, float fsize, float padding, COLOR color, TextGraphicsOptions options)
{
// http://sixlabors.com/2017/04/08/watermarks/
if (string.IsNullOrEmpty(text))
{
return(null);
}
var font = new SixLabors.Fonts.Font(ffamily, fsize);
var roptions = new SixLabors.Fonts.RendererOptions(font, 96);
var size = SixLabors.Fonts.TextMeasurer.Measure(text, roptions);
var w = (int)Math.Ceiling(size.Width + padding * 2);
var h = (int)Math.Ceiling(size.Height + padding * 2);
var img = new IMAGE32(w, h);
img.Mutate(dc => dc.DrawText(options, text, font, color, new System.Numerics.Vector2(padding, padding)));
return(img);
}
private static void _DrawGlyph(Image <Rgba32> dstImage, Size cellSize, Size padding, SixLabors.Fonts.RendererOptions context, char c)
{
var x = ((int)c) % 16;
var y = ((int)c) / 16;
x *= cellSize.Width;
y *= cellSize.Height;
x += padding.Width;
y += padding.Height;
var glyph = context.GetCharacterGlypth(c);
var bounds = glyph.Bounds;
dstImage.DrawGlypth(context, x, y, c);
}
public static IPathCollection GetCharacterGlypth(this SixLabors.Fonts.RendererOptions options, char character)
{
return(TextBuilder.GenerateGlyphs(string.Empty + character, options));
}
