/// <summary>
/// Add text watermark over the image.
/// </summary>
/// <param name="img"></param>
/// <param name="text">text to draw over the image</param>
/// <param name="ops">Text watermark options <see cref="TextWatermarkOptions"/></param>
public static Image AddTextWatermark(this Image img, string text, TextWatermarkOptions ops)
{
using (var graphics = Graphics.FromImage(img))
{
var bgPos = TextWatermarkPosition.SetBGPos(img.Width, img.Height, ops.FontSize, ops.Location, ops.Margin);
var sf = new StringFormat()
{
FormatFlags = StringFormatFlags.NoWrap
};
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.CompositingQuality = CompositingQuality.HighQuality;
//graphics.TextRenderingHint = TextRenderingHint.AntiAlias;
//graphics.TextContrast = 12;
//graphics.CompositingMode = CompositingMode.SourceOver;
//graphics.InterpolationMode = InterpolationMode.High;
// Draw background if not fully transparent
if (ops.BGColor.A > 0)
{
var bgBrush = new SolidBrush(ops.BGColor);
graphics.FillRectangle(bgBrush, bgPos);
}
// Set font to use
var ff = new FontFamily(ops.FontName);
var font = new Font(ff, ops.FontSize, ops.FontStyle, GraphicsUnit.Pixel);
// Measure text size
var textMetrics = graphics.MeasureString(text, font, img.Width, sf);
var beforeText = TextWatermarkPosition.SetTextAlign(textMetrics, img.Width, ops.Location);
var drawPoint = new PointF(beforeText, bgPos.Y + (bgPos.Height / 4));
var outlineBrush = new SolidBrush(ops.OutlineColor);
using (var pen = new Pen(outlineBrush, ops.OutlineWidth))
{
using (var p = new GraphicsPath())
{
p.AddString(text, ff, (int)ops.FontStyle, ops.FontSize, drawPoint, sf);
// Draw text outline if not fully transparent
if (ops.OutlineColor.A > 0)
{
graphics.DrawPath(pen, p);
}
// Draw text if not fully transparent
if (ops.TextColor.A > 0)
{
var textBrush = new SolidBrush(ops.TextColor);
graphics.FillPath(textBrush, p);
}
}
}
}
return(img);
}
public static void TextWatermark(this Image img,
string text,
string color = "#77FFFFFF", string bgColor = "#00000000",
string fontFamily = "Arial", int size = 24,
TargetSpot spot = TargetSpot.BottomLeft, FontStyle style = FontStyle.Regular, int margin = 10)
{
var graphics = Graphics.FromImage(img);
graphics.TextRenderingHint = TextRenderingHint.AntiAlias;
graphics.TextContrast = 12;
graphics.SmoothingMode = SmoothingMode.None;
graphics.CompositingMode = CompositingMode.SourceOver;
var _bgAlpha = int.Parse(bgColor.Substring(1, 2), NumberStyles.HexNumber);
var _bgColor = bgColor.Substring(3, 6);
var bgBrush = new SolidBrush(
Color.FromArgb(_bgAlpha, ColorTranslator.FromHtml($"#{_bgColor}")));
var rectPos = TextWatermarkPosition.SetBGPos(img.Width, img.Height, size, spot, margin);
graphics.FillRectangle(bgBrush, rectPos);
var textFont = new Font(fontFamily, size, style, GraphicsUnit.Pixel);
var _alpha = int.Parse(color.Substring(1, 2), NumberStyles.HexNumber);
var _color = color.Substring(3, 6);
var textBrush = new SolidBrush(
Color.FromArgb(_alpha, ColorTranslator.FromHtml($"#{_color}")));
var textMetrics = graphics.MeasureString(text, textFont);
var beforeText = TextWatermarkPosition.SetTextAlign(textMetrics, img.Width, spot);
var drawPoint = new PointF(beforeText, rectPos.Y + (rectPos.Height / 4));
graphics.DrawString(text, textFont, textBrush, drawPoint);
graphics.Dispose();
}
