private void button1_Click(object sender, EventArgs e)
{
Tuple <bool, string> checkResult = ValidateData();
if (!checkResult.Item1)
{
MessageBox.Show(checkResult.Item2);
return;
}
string outputType = radioJPG.Checked ? ".jpg" : ".png";
int paddingleft = 0;
int paddingright = 0;
int paddingtop = 0;
int paddingbottom = 0;
Single alpha = Convert.ToSingle(txtAlpha.Text);
WatermarkDirection wmd = WatermarkDirection.TopLeft;
if (radioLT.Checked)
{
wmd = WatermarkDirection.TopLeft;
paddingleft = Convert.ToInt32(txtLTMarginLeft.Text);
paddingtop = Convert.ToInt32(txtLTMarginTop.Text);
}
if (radioLB.Checked)
{
wmd = WatermarkDirection.BottomLeft;
paddingleft = Convert.ToInt32(txtLBMarginLeft.Text);
paddingbottom = Convert.ToInt32(txtLBMarginBottom.Text);
}
if (radioRT.Checked)
{
wmd = WatermarkDirection.TopRight;
paddingtop = Convert.ToInt32(txtRTMarginTop.Text);
paddingright = Convert.ToInt32(txtRTMarginRight.Text);
}
if (radioRB.Checked)
{
wmd = WatermarkDirection.BottomRight;
paddingright = Convert.ToInt32(txtRBMarginRight.Text);
paddingbottom = Convert.ToInt32(txtRBMarginBottom.Text);
}
try
{
ImageGenerator generator = new ImageGenerator();
string target = generator.BuildWatermark(txtOrginal.Text, txtWaterMark.Text, txtOutput.Text, outputType, chkMarkStyle.Checked, chkMartString.Checked, Convert.ToInt32(txtMarkWidth.Text), Convert.ToInt32(txtMarkHeight.Text), alpha, wmd, paddingleft, paddingtop, paddingright, paddingbottom, txtMarkText.Text);
pictureBox1.Image = Image.FromFile(target);
MessageBox.Show("水印添加成功");
}
catch (Exception ex)
{
MessageBox.Show("添加水印时发生错误：" + ex.Message);
}
}
/// <summary>
/// 创建带水印的图片
/// </summary>
/// <param name="sourcePath">原图片地址</param>
/// <param name="watermarkPath">水印图片路径</param>
/// <param name="targetPath">输出路径</param>
/// <param name="targetType">输出类型</param>
/// <param name="styleEnabled">启用自定义格式</param>
/// <param name="textEnabled">启用自定义文字</param>
/// <param name="width">水印宽度</param>
/// <param name="height">水印高度</param>
/// <param name="direction">水印位置</param>
/// <param name="paddingleft">距左</param>
/// <param name="paddingtop">距上</param>
/// <param name="paddingright">距右</param>
/// <param name="paddingbottom">距下</param>
/// <param name="text">水印文字</param>
/// <returns>图片路径</returns>
public string BuildWatermark(string sourcePath,
string watermarkPath,
string targetPath,
string targetType,
bool styleEnabled = false,
bool textEnabled = false,
int width = 50,
int height = 50,
Single alpha = 1.0f,
WatermarkDirection direction = WatermarkDirection.TopLeft,
int paddingleft = 0,
int paddingtop = 0,
int paddingright = 0,
int paddingbottom = 0,
string text = "")
{
//原图像
Image imgSource = Image.FromFile(sourcePath);
int sourceWidth = imgSource.Width;
int sourceHeight = imgSource.Height;
//水印图像
Image imgWatermark = new Bitmap(watermarkPath);
int wmWidth = imgWatermark.Width;
int wmHeight = imgWatermark.Height;
//原Bitmap
Bitmap bmSource = new Bitmap(sourceWidth, sourceHeight, PixelFormat.Format24bppRgb);
bmSource.SetResolution(72, 72);
Graphics grSource = Graphics.FromImage(bmSource);
grSource.SmoothingMode = SmoothingMode.AntiAlias;
grSource.DrawImage(imgSource, new Rectangle(0, 0, sourceWidth, sourceHeight), 0, 0, sourceWidth, sourceHeight, GraphicsUnit.Pixel);
if (textEnabled)
{
//找到适合的字体大小
int[] sizes = new int[] { 36, 24, 16, 14, 10, 6, 4 };
Font crFont = null;
SizeF crSize = new SizeF();
for (int i = 0; i < 7; i++)
{
crFont = new Font("arial", sizes[i], FontStyle.Bold);
crSize = grSource.MeasureString(text, crFont);
if ((ushort)crSize.Width < (ushort)sourceWidth)
{
break;
}
}
//计算X,Y坐标
int yPixlesFromBottom = (int)(sourceHeight * 0.05);
float yPosFromBottom = ((sourceHeight - yPixlesFromBottom) - (crSize.Height / 2));
float xCenterOfSource = (sourceWidth / 2);
//画出水印文字
StringFormat StrFormat = new StringFormat();
StrFormat.Alignment = StringAlignment.Center;
SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
grSource.DrawString(text, crFont, semiTransBrush, new PointF(xCenterOfSource, yPosFromBottom), StrFormat);
}
//重新加载bitmap
Bitmap bmWatermark = new Bitmap(bmSource);
bmWatermark.SetResolution(imgSource.HorizontalResolution, imgSource.VerticalResolution);
Graphics grWatermark = Graphics.FromImage(bmWatermark);
//通过定义一个ImageAttributes 对象并设置它的两个属性，我们就是实现了两个颜色的处理，以达到半透明的水印效果。
//处理水印图象的第一步是把背景图案变为透明的(Alpha=0, R=0, G=0, B=0)。我们使用一个Colormap 和定义一个RemapTable来做这个。
//就像前面展示的，我的水印被定义为100%绿色背景，我们将搜到这个颜色，然后取代为透明。
ImageAttributes imageAttributes = new ImageAttributes();
ColorMap colorMap = new ColorMap();
colorMap.OldColor = Color.FromArgb(255, 0, 255, 0);
colorMap.NewColor = Color.FromArgb(0, 0, 0, 0);
ColorMap[] remapTable = { colorMap };
//第二个颜色处理用来改变水印的不透明性。
//通过应用包含提供了坐标的RGBA空间的5x5矩阵来做这个。
//通过设定第三行、第三列为0.3f我们就达到了一个不透明的水平。结果是水印会轻微地显示在图象底下一些。
imageAttributes.SetRemapTable(remapTable, ColorAdjustType.Bitmap);
float[][] colorMatrixElements =
{
new float[] { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f },
new float[] { 0.0f, 1.0f, 0.0f, 0.0f, 0.0f },
new float[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f },
new float[] { 0.0f, 0.0f, 0.0f, alpha, 0.0f },
new float[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }
};
ColorMatrix wmColorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(wmColorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
int xPosOfWm = 0;
int yPosOfWm = 0;
switch (direction)
{
case WatermarkDirection.TopLeft:
xPosOfWm = paddingleft;
yPosOfWm = paddingtop;
break;
case WatermarkDirection.TopRight:
xPosOfWm = sourceWidth - width - paddingright;
yPosOfWm = paddingtop;
break;
case WatermarkDirection.BottomLeft:
xPosOfWm = paddingleft;
yPosOfWm = sourceHeight - height - paddingbottom;
break;
case WatermarkDirection.BottomRight:
xPosOfWm = sourceWidth - width - paddingright;
yPosOfWm = sourceHeight - height - paddingbottom;
break;
}
grWatermark.DrawImage(imgWatermark, new Rectangle(xPosOfWm, yPosOfWm, width, height), 0, 0, wmWidth, wmHeight, GraphicsUnit.Pixel, imageAttributes);
//最后的步骤将是使用新的Bitmap取代原来的Image。 销毁两个Graphic对象，然后把Image 保存到文件系统。
imgSource = bmWatermark;
grSource.Dispose();
grWatermark.Dispose();
string filename = targetPath + "\\" + DateTime.Now.ToString("yyyyMMddHHmmss") + targetType;
if (targetType == ".jpg")
{
imgSource.Save(filename, ImageFormat.Jpeg);
}
else
{
imgSource.Save(filename, ImageFormat.Png);
}
imgSource.Dispose();
imgWatermark.Dispose();
return(filename);
}
