/// <summary>
/// Draws the text onto the the image filled via the brush then outlined via the pen.
/// </summary>
/// <typeparam name="TPixel">The type of the color.</typeparam>
/// <param name="source">The image this method extends.</param>
/// <param name="text">The text.</param>
/// <param name="font">The font.</param>
/// <param name="brush">The brush.</param>
/// <param name="pen">The pen.</param>
/// <param name="location">The location.</param>
/// <param name="options">The options.</param>
/// <returns>
/// The <see cref="Image{TPixel}" />.
/// </returns>
public static Image <TPixel> DrawText <TPixel>(this Image <TPixel> source, string text, Font font, IBrush <TPixel> brush, IPen <TPixel> pen, Vector2 location, TextGraphicsOptions options)
where TPixel : struct, IPixel <TPixel>
{
Vector2 dpi = DefaultTextDpi;
if (options.UseImageResolution)
{
dpi = new Vector2((float)source.MetaData.HorizontalResolution, (float)source.MetaData.VerticalResolution);
}
var style = new FontSpan(font, dpi)
{
ApplyKerning = options.ApplyKerning,
TabWidth = options.TabWidth,
WrappingWidth = options.WrapTextWidth,
HorizontalAlignment = options.HorizontalAlignment,
VerticalAlignment = options.VerticalAlignment
};
IPathCollection glyphs = TextBuilder.GenerateGlyphs(text, location, style);
var pathOptions = (GraphicsOptions)options;
if (brush != null)
{
source.Fill(brush, glyphs, pathOptions);
}
if (pen != null)
{
source.Draw(pen, glyphs, pathOptions);
}
return(source);
}
/// <summary>
/// Draws the text onto the the image filled via the brush then outlined via the pen.
/// </summary>
/// <typeparam name="TPixel">The type of the color.</typeparam>
/// <param name="source">The image this method extends.</param>
/// <param name="text">The text.</param>
/// <param name="font">The font.</param>
/// <param name="brush">The brush.</param>
/// <param name="pen">The pen.</param>
/// <param name="location">The location.</param>
/// <param name="options">The options.</param>
/// <returns>
/// The <see cref="Image{TPixel}" />.
/// </returns>
public static Image <TPixel> DrawText <TPixel>(this Image <TPixel> source, string text, Font font, IBrush <TPixel> brush, IPen <TPixel> pen, Vector2 location, TextGraphicsOptions options)
where TPixel : struct, IPixel <TPixel>
{
GlyphBuilder glyphBuilder = new GlyphBuilder(location);
TextRenderer renderer = new TextRenderer(glyphBuilder);
Vector2 dpi = DefaultTextDpi;
if (options.UseImageResolution)
{
dpi = new Vector2((float)source.MetaData.HorizontalResolution, (float)source.MetaData.VerticalResolution);
}
FontSpan style = new FontSpan(font, dpi)
{
ApplyKerning = options.ApplyKerning,
TabWidth = options.TabWidth,
WrappingWidth = options.WrapTextWidth,
Alignment = options.TextAlignment
};
renderer.RenderText(text, style);
System.Collections.Generic.IEnumerable <SixLabors.Shapes.IPath> shapesToDraw = glyphBuilder.Paths;
GraphicsOptions pathOptions = (GraphicsOptions)options;
if (brush != null)
{
foreach (SixLabors.Shapes.IPath s in shapesToDraw)
{
source.Fill(brush, s, pathOptions);
}
}
if (pen != null)
{
foreach (SixLabors.Shapes.IPath s in shapesToDraw)
{
source.Draw(pen, s, pathOptions);
}
}
return(source);
}
/// <summary>
/// Draws the text onto the the image filled via the brush then outlined via the pen.
/// </summary>
/// <typeparam name="TColor">The type of the color.</typeparam>
/// <param name="source">The image this method extends.</param>
/// <param name="text">The text.</param>
/// <param name="font">The font.</param>
/// <param name="brush">The brush.</param>
/// <param name="pen">The pen.</param>
/// <param name="location">The location.</param>
/// <param name="options">The options.</param>
/// <returns>
/// The <see cref="Image{TColor}" />.
/// </returns>
public static Image <TColor> DrawTextAlongPath <TColor>(this Image <TColor> source, string text, Font font, IBrush <TColor> brush, IPath path, TextGraphicsOptions options)
where TColor : struct, IPixel <TColor>
{
Vector2 dpi = DefaultTextDpi;
if (options.UseImageResolution)
{
dpi = new Vector2((float)source.MetaData.HorizontalResolution, (float)source.MetaData.VerticalResolution);
}
FontSpan style = new FontSpan(font, dpi)
{
ApplyKerning = options.ApplyKerning,
TabWidth = options.TabWidth,
WrappingWidth = options.WrapTextWidth,
Alignment = TextAlignment.Center
};
var size = new TextMeasurer().MeasureText(text, style);
WordArtGlyphBuilder glyphBuilder = new WordArtGlyphBuilder(path, size);
TextRenderer renderer = new TextRenderer(glyphBuilder);
renderer.RenderText(text, style);
System.Collections.Generic.IEnumerable <SixLabors.Shapes.IPath> shapesToDraw = glyphBuilder.Paths;
GraphicsOptions pathOptions = (GraphicsOptions)options;
if (brush != null)
{
foreach (SixLabors.Shapes.IPath s in shapesToDraw)
{
source.Fill(brush, s, pathOptions);
}
}
return(source);
}
static void ApplyWaterMarkScaledWordWrap(Font font, string text, string inputPath, string outputPath)
{
using (Image img = Image.Load(inputPath))
{
float padding = 20; // margin in 20px
float targetWidth = img.Width - (padding * 2);
float targetHeight = img.Height - (padding * 2);
float targetMinHeight = img.Height - (padding * 3); // must be with in a margin width of the target height
TextMeasurer measurer = new TextMeasurer();
// now we are working i 2 dimensions at once and cant just scale because it will cause the text to
// reflow we need to just try multiple times
var f = font;
SixLabors.Fonts.Size s = new SixLabors.Fonts.Size(float.MaxValue, float.MaxValue);
float scaleFactor = (f.Size / 2);// everytime we change direction we half this size
int trapCount = (int)f.Size * 2;
if (trapCount < 10)
{
trapCount = 10;
}
bool isTooSmall = false;
while ((s.Height > targetHeight || s.Height < targetMinHeight) && trapCount > 0)
{
if (s.Height > targetHeight)
{
if (isTooSmall)
{
scaleFactor = scaleFactor / 2;
}
f = new Font(f, f.Size - scaleFactor);
isTooSmall = false;
}
if (s.Height < targetMinHeight)
{
if (!isTooSmall)
{
scaleFactor = scaleFactor / 2;
}
f = new Font(f, f.Size + scaleFactor);
isTooSmall = true;
}
trapCount--;
var style = new FontSpan(f, 72)
{
WrappingWidth = targetWidth
};
s = measurer.MeasureText(text, style);
}
Color fill = new Color(128, 128, 128, 200);
img.DrawText(text, f
, fill, new Vector2(padding), new ImageSharp.Drawing.TextGraphicsOptions {
WrapTextWidth = targetWidth
});
img.Save(outputPath);
}
}
