/// <summary>
/// 创建水印上下文实例（文本水印）
/// </summary>
/// <param name="text">文本水印</param>
/// <param name="location">水印位置，默认为下-右</param>
public ImageWaterMarkContext(string text, ImageWaterMarkLocation location = ImageWaterMarkLocation.BottomRight)
: this(location) {
if (string.IsNullOrEmpty(text))
{
throw new ArgumentNullException("text", "文本水印内容不能为null或“”。");
}
Text = text;
}
/// <summary>
/// 创建水印上下文实例（图像水印）
/// </summary>
/// <param name="image">图像水印</param>
/// <param name="location">水印位置，默认为下-右</param>
public ImageWaterMarkContext(Bitmap image, ImageWaterMarkLocation location = ImageWaterMarkLocation.BottomRight)
: this(location) {
if (image == null)
{
throw new ArgumentNullException("image", "图像水印不能为null。");
}
Image = image;
}
private ImageWaterMarkContext(ImageWaterMarkLocation location)
{
Location = location;
Margin = DefaultMargin;
TextFont = DefaultTextFont;
TextBackColor = TextBackColor;
TextForeColor = DefaultTextForeColor;
TextBorderColor = DefaultBorderColor;
Opacity = 0.51F;
}
