c#给图片添加文字
<div id="cnblogs_post_body">using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Threading;
using System.Drawing.Imaging;
/* Author : IT
* Date: 2011-11-13 14:52:53
* Blog: www.chenpan.name
*/
namespace WaterImage
{
public partial class Form2 : Form
{
Image imgWeight;
public Form2()
{
InitializeComponent();
}
/// <summary>
/// 从数据库中加载二进制图片
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button1_Click(object sender, EventArgs e)
{
string strSql = "Select Top 1 FileContent From Sys_FileSave";
Byte[] byteImage = new Byte[0];
byteImage = (Byte[])(DbHelperSQL.GetSingle(strSql));
MemoryStream stmBLOBData = new MemoryStream(byteImage);
imgWeight = Image.FromStream(stmBLOBData); pictureBox1.Image = imgWeight;
}
/// <summary>
/// 在原图片基础上加载文字水印
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button2_Click(object sender, EventArgs e)
{
Graphics GImage = Graphics.FromImage(imgWeight);
addWatermarkText(GImage, "重量为60.00吨", "WM_BOTTOM_RIGHT", imgWeight.Width, imgWeight.Height);
pictureBox1.Image = imgWeight;
}
/// <summary>
/// 在原图片基础上加载图片水印
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button3_Click(object sender, EventArgs e)
{
Graphics GImage = Graphics.FromImage(imgWeight);
addWatermarkImage(GImage, @"C:\Documents and Settings\Administrator\桌面\Mark.png", "WM_TOP_LEFT", imgWeight.Width, imgWeight.Height);
pictureBox1.Image = imgWeight;
}
/// <summary>
/// 生成图片缩略图
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void button4_Click(object sender, EventArgs e)
{
GreateMiniImage(@"C:\Documents and Settings\Administrator\桌面\Source.jpg", @"C:\Documents and Settings\Administrator\桌面\Small.png", 100, 200);
}
/// <summary>
///加水印文字
/// </summary>
/// <param name="picture">imge 对象</param>
/// <param name="_watermarkText">水印文字内容</param>
/// <param name="_watermarkPosition">水印位置</param>
/// <param name="_width">被加水印图片的宽</param>
/// <param name="_height">被加水印图片的高</param>
private void addWatermarkText(Graphics picture, string _watermarkText, string _watermarkPosition, int _width, int _height)
{
int[] sizes = new int[] { 16, 14, 12, 10, 8, 6, 4 };
Font crFont = null;
SizeF crSize = new SizeF();
for (int i = 0; i < 7; i++)
{
crFont = new Font("arial", sizes, FontStyle.Bold);
crSize = picture.MeasureString(_watermarkText, crFont);
if ((ushort)crSize.Width < (ushort)_width)
break;
}
float xpos = 0;
float ypos = 0;
switch (_watermarkPosition)
{
case "WM_TOP_LEFT":
xpos = ((float)_width * (float).01) + (crSize.Width / 2);
ypos = (float)_height * (float).01;
break;
case "WM_TOP_RIGHT":
xpos = ((float)_width * (float).99) - (crSize.Width / 2);
ypos = (float)_height * (float).01;
break;
case "WM_BOTTOM_RIGHT":
xpos = ((float)_width * (float).99) - (crSize.Width / 2);
ypos = ((float)_height * (float).99) - crSize.Height;
break;
case "WM_BOTTOM_LEFT":
xpos = ((float)_width * (float).01) + (crSize.Width / 2);
ypos = ((float)_height * (float).99) - crSize.Height;
break;
}
StringFormat StrFormat = new StringFormat();
StrFormat.Alignment = StringAlignment.Center;
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));
picture.DrawString(_watermarkText, crFont, semiTransBrush2, xpos + 1, ypos + 1, StrFormat);
SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
picture.DrawString(_watermarkText, crFont, semiTransBrush, xpos, ypos, StrFormat);
semiTransBrush2.Dispose();
semiTransBrush.Dispose();
}
/// <summary>
///加水印图片
/// </summary>
/// <param name="picture">imge 对象</param>
/// <param name="WaterMarkPicPath">水印图片的地址</param>
/// <param name="_watermarkPosition">水印位置</param>
/// <param name="_width">被加水印图片的宽</param>
/// <param name="_height">被加水印图片的高</param>
private void addWatermarkImage(Graphics picture, string WaterMarkPicPath, string _watermarkPosition, int _width, int _height)
{
Image watermark = new Bitmap(WaterMarkPicPath);
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 };
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,0.3f, 0.0f},
new float[] {0.0f,0.0f,0.0f,0.0f, 1.0f}
};
ColorMatrix colorMatrix = new ColorMatrix(colorMatrixElements);
imageAttributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
int xpos = 0;
int ypos = 0;
int WatermarkWidth = 0;
int WatermarkHeight = 0;
double bl = 1d;
//计算水印图片的比率
//取背景的1/4宽度来比较
if ((_width > watermark.Width * 4) && (_height > watermark.Height * 4))
{
bl = 1;
}
else if ((_width > watermark.Width * 4) && (_height < watermark.Height * 4))
{
bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height);
}
else
if ((_width < watermark.Width * 4) && (_height > watermark.Height * 4))
{
bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width);
}
else
{
if ((_width * watermark.Height) > (_height * watermark.Width))
{
bl = Convert.ToDouble(_height / 4) / Convert.ToDouble(watermark.Height);
}
else
{
bl = Convert.ToDouble(_width / 4) / Convert.ToDouble(watermark.Width);
}
}
WatermarkWidth = Convert.ToInt32(watermark.Width * bl);
WatermarkHeight = Convert.ToInt32(watermark.Height * bl);
switch (_watermarkPosition)
{
case "WM_TOP_LEFT":
xpos = 10;
ypos = 10;
break;
case "WM_TOP_RIGHT":
xpos = _width - WatermarkWidth - 10;
ypos = 10;
break;
case "WM_BOTTOM_RIGHT":
xpos = _width - WatermarkWidth - 10;
ypos = _height - WatermarkHeight - 10;
break;
case "WM_BOTTOM_LEFT":
xpos = 10;
ypos = _height - WatermarkHeight - 10;
break;
}
picture.DrawImage(watermark, new Rectangle(xpos, ypos, WatermarkWidth, WatermarkHeight), 0, 0, watermark.Width, watermark.Height, GraphicsUnit.Pixel, imageAttributes);
watermark.Dispose();
imageAttributes.Dispose();
}
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="oldpath">原图片地址</param>
/// <param name="newpath">新图片地址</param>
/// <param name="tWidth">缩略图的宽</param>
/// <param name="tHeight">缩略图的高</param>
private void GreateMiniImage(string oldpath, string newpath, int tWidth, int tHeight)
{
try
{
System.Drawing.Image image = System.Drawing.Image.FromFile(oldpath);
double bl = 1d;
if ((image.Width <= image.Height) && (tWidth >= tHeight))
{
bl = Convert.ToDouble(image.Height) / Convert.ToDouble(tHeight);
}
else if ((image.Width > image.Height) && (tWidth < tHeight))
{
bl = Convert.ToDouble(image.Width) / Convert.ToDouble(tWidth);
}
else
if ((image.Width <= image.Height) && (tWidth <= tHeight))
{
if (image.Height / tHeight >= image.Width / tWidth)
{
bl = Convert.ToDouble(image.Width) / Convert.ToDouble(tWidth);
}
else
{
bl = Convert.ToDouble(image.Height) / Convert.ToDouble(tHeight);
}
}
else
{
if (image.Height / tHeight >= image.Width / tWidth)
{
bl = Convert.ToDouble(image.Height) / Convert.ToDouble(tHeight);
}
else
{
bl = Convert.ToDouble(image.Width) / Convert.ToDouble(tWidth);
}
}
Bitmap b = new Bitmap(image, Convert.ToInt32(image.Width / bl), Convert.ToInt32(image.Height / bl));
b.Save(newpath);
b.Dispose();
image.Dispose();
}
catch
{
}
}
}
}
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