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Fixed magic number in CalcWatermarkOrigin method

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This commit is contained in:
Andrew
2026-06-04 08:29:28 +03:00
parent acbd0d7841
commit 9076c8a12d
1 changed files with 41 additions and 16 deletions
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Watermark.Net/src/WatermarkNet.Common/ImageRenderer.cs
+41 -16
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@@ -39,43 +39,68 @@ namespace Watermark.Net.src.WatermarkNet.Core
}
/// <summary>
/// Calculates origin point for text watermark based on position and size.
/// Calculates precise origin point for text watermark based on position and metrics.
/// </summary>
private PointF CalcWatermarkOrigin(int width, int height, float watermarkSize, ImagePosition position)
private PointF CalcWatermarkOrigin(int width, int height, float watermarkSize, ImagePosition position, FontRectangle textSize)
{
var origin = new PointF(0, 0);
//Static value 1 pt is 72 px per inch
var pixelsPerInch = 72;
var wmHeight = watermarkSize / pixelsPerInch;
var textPading = height / 10; // Minimum padding from edges
switch (position)
{
case ImagePosition.TopLeft:
origin = new PointF(watermarkSize / 2, wmHeight / 2);
origin = new PointF(
Math.Max(0, -textSize.Left) + textPading,
Math.Max(0, -textSize.Top) + textPading
);
break;
case ImagePosition.TopCenter:
origin = new PointF(width / 2, wmHeight / 2);
origin = new PointF(
Math.Max(0, width / 2 - textSize.Width / 2 - textSize.Left),
Math.Max(0, -textSize.Top) + textPading
);
break;
case ImagePosition.TopRight:
origin = new PointF(width - watermarkSize * 2, wmHeight / 2);
origin = new PointF(
Math.Max(0, width - textSize.Width - textSize.Left) - textPading,
Math.Max(0, -textSize.Top) + textPading
);
break;
case ImagePosition.CenterLeft:
origin = new PointF(watermarkSize / 2, height / 2.5f);
origin = new PointF(
Math.Max(0, -textSize.Left) + textPading,
Math.Max(0, height / 2 - textSize.Height / 2 - textSize.Top)
);
break;
case ImagePosition.Center:
origin = new PointF(width / 2, height / 2.5f);
origin = new PointF(
Math.Max(0, width / 2 - textSize.Width / 2 - textSize.Left),
Math.Max(0, height / 2 - textSize.Height / 2 - textSize.Top)
);
break;
case ImagePosition.CenterRight:
origin = new PointF(width - watermarkSize * 2, height / 2.5f);
origin = new PointF(
Math.Max(0, width - textSize.Width - textSize.Left) - textPading,
Math.Max(0, height / 2 - textSize.Height / 2 - textSize.Top)
);
break;
case ImagePosition.BottomLeft:
origin = new PointF(watermarkSize / 2, height - watermarkSize * 2);
origin = new PointF(
Math.Max(0, - textSize.Left) + textPading,
Math.Max(0, height - textSize.Height - textSize.Top) - textPading
);
break;
case ImagePosition.BottomCenter:
origin = new PointF(width / 2, height - watermarkSize * 2);
origin = new PointF(
Math.Max(0, width / 2 - textSize.Width / 2 - textSize.Left),
Math.Max(0, height - textSize.Height - textSize.Top) - textPading
);
break;
case ImagePosition.BottomRight:
origin = new PointF(width - watermarkSize * 2, height - watermarkSize * 2);
origin = new PointF(
Math.Max(0, width - textSize.Width - textSize.Left) - textPading,
Math.Max(0, height - textSize.Height - textSize.Top) - textPading
);
break;
default:
break;
@@ -167,7 +192,7 @@ namespace Watermark.Net.src.WatermarkNet.Core
var textOptions = new RichTextOptions(scaledFont)
{
ColorFontSupport = ColorFontSupport.MicrosoftColrFormat,
Origin = CalcWatermarkOrigin(imgSize.Width, imgSize.Height, scaledFont.Size, watermark.Layout.Position),
Origin = CalcWatermarkOrigin(imgSize.Width, imgSize.Height, scaledFont.Size, watermark.Layout.Position, size),
HorizontalAlignment = HorizontalAlignmentFromPosition(watermark.Layout.Position),
VerticalAlignment = VerticalAlignment.Top,
};
@@ -176,7 +201,7 @@ namespace Watermark.Net.src.WatermarkNet.Core
{
foreach (ImagePosition position in (ImagePosition[])Enum.GetValues(typeof(ImagePosition)))
{
textOptions.Origin = CalcWatermarkOrigin(imgSize.Width, imgSize.Height, scaledFont.Size, position);
textOptions.Origin = CalcWatermarkOrigin(imgSize.Width, imgSize.Height, scaledFont.Size, position, size);
textOptions.HorizontalAlignment = HorizontalAlignmentFromPosition(position);
processingContext.DrawText(textOptions, watermark.Text, watermark.Style.Color);
}