/// <summary>
/// 输出验证码
/// </summary>
/// <param name="checkCode"></param>
public static byte[] CreateImage(string checkCode)
{
int iwidth = (int)(checkCode.Length * 15);
System.DrawingCore.Bitmap image = new System.DrawingCore.Bitmap(iwidth, 20);
System.DrawingCore.Graphics g = System.DrawingCore.Graphics.FromImage(image);
g.Clear(System.DrawingCore.Color.White);
//定义颜色
Color[] c = { Color.Black, Color.Red, Color.DarkBlue, Color.Green, Color.Brown, Color.DarkCyan, Color.Purple };
//定义字体
string[] font = { "Times New Roman", "Microsoft Sans Serif", "MS Mincho", "Book Antiqua", "PMingLiU" };
Random rand = new Random();
//随机输出噪点
for (int i = 0; i < 50; i++)
{
int x = rand.Next(image.Width);
int y = rand.Next(image.Height);
g.DrawRectangle(new Pen(Color.LightGray, 0), x, y, 1, 1);
}
//输出不同字体和颜色的验证码字符
for (int i = 0; i < checkCode.Length; i++)
{
int cindex = rand.Next(7);
int findex = rand.Next(5);
Font f = new Font(font[findex], 10, FontStyle.Bold);
Brush b = new SolidBrush(c[cindex]);
int ii = 4;
if ((i + 1) % 2 == 0)
{
ii = 2;
}
g.DrawString(checkCode.Substring(i, 1), f, b, 3 + (i * 14), ii);
}
//画一个边框
g.DrawRectangle(new Pen(Color.Black, 0), 0, 0, image.Width - 1, image.Height - 1);
//输出到浏览器
System.IO.MemoryStream ms = new System.IO.MemoryStream();
image.Save(ms, System.DrawingCore.Imaging.ImageFormat.Jpeg);
byte[] buffer = ms.ToArray();
g.Dispose();
image.Dispose();
return(buffer);
}
/// <summary>
/// 生成图片缩略图
/// </summary>
/// <param name="sourcePath">图片路径</param>
/// <param name="newPath">新图片路径</param>
/// <param name="width">宽度</param>
/// <param name="height">高度</param>
public static void MakeThumbnail(string sourcePath, string newPath, int width, int height)
{
System.DrawingCore.Image ig = System.DrawingCore.Image.FromFile(sourcePath);
int towidth = width;
int toheight = height;
int x = 0;
int y = 0;
int ow = ig.Width;
int oh = ig.Height;
if ((double)ig.Width / (double)ig.Height > (double)towidth / (double)toheight)
{
oh = ig.Height;
ow = ig.Height * towidth / toheight;
y = 0;
x = (ig.Width - ow) / 2;
}
else
{
ow = ig.Width;
oh = ig.Width * height / towidth;
x = 0;
y = (ig.Height - oh) / 2;
}
System.DrawingCore.Image bitmap = new System.DrawingCore.Bitmap(towidth, toheight);
System.DrawingCore.Graphics g = System.DrawingCore.Graphics.FromImage(bitmap);
g.InterpolationMode = System.DrawingCore.Drawing2D.InterpolationMode.High;
g.SmoothingMode = System.DrawingCore.Drawing2D.SmoothingMode.HighQuality;
g.Clear(System.DrawingCore.Color.Transparent);
g.DrawImage(ig, new System.DrawingCore.Rectangle(0, 0, towidth, toheight), new System.DrawingCore.Rectangle(x, y, ow, oh), GraphicsUnit.Pixel);
try
{
bitmap.Save(newPath, System.DrawingCore.Imaging.ImageFormat.Jpeg);
}
catch (Exception ex)
{
throw ex;
}
finally
{
ig.Dispose();
bitmap.Dispose();
g.Dispose();
}
}
private Bitmap ConvertPixelDataToBitmap(PixelData pixelData)
{
using (var bitmap = new System.DrawingCore.Bitmap(pixelData.Width, pixelData.Height, System.DrawingCore.Imaging.PixelFormat.Format32bppRgb))
using (var ms = new MemoryStream())
{
var bitmapData = bitmap.LockBits(new System.DrawingCore.Rectangle(0, 0, pixelData.Width, pixelData.Height), System.DrawingCore.Imaging.ImageLockMode.WriteOnly, System.DrawingCore.Imaging.PixelFormat.Format32bppRgb);
try
{
// we assume that the row stride of the bitmap is aligned to 4 byte multiplied by the width of the image
System.Runtime.InteropServices.Marshal.Copy(pixelData.Pixels, 0, bitmapData.Scan0, pixelData.Pixels.Length);
}
finally
{
bitmap.UnlockBits(bitmapData);
}
// save to stream as PNG
bitmap.Save(ms, System.DrawingCore.Imaging.ImageFormat.Jpeg);
return(bitmap);
}
}
/// <summary>
/// 生成缩略图到MemoryStream
/// </summary>
/// <param name="SourceFile"></param>
/// <param name="intThumbWidth"></param>
/// <param name="intThumbHeight"></param>
/// <param name="gap">是否补足空白</param>
public static MemoryStream ThumbImageToStream(string SourceFile, int intThumbWidth, int intThumbHeight, bool gap = true)
{
MemoryStream ms = new MemoryStream();
//原图加载
using (System.DrawingCore.Image sourceImage = System.DrawingCore.Image.FromFile(SourceFile))
{
//是否显示原图
if (intThumbWidth == 0 && intThumbHeight == 0)
{
sourceImage.Save(ms, System.DrawingCore.Imaging.ImageFormat.Png);
return(ms);
}
//原图宽度和高度
int width = sourceImage.Width;
int height = sourceImage.Height;
int smallWidth;
int smallHeight;
//如果原图长宽均比缩略图的要小则返回原stream
if (width <= intThumbWidth && height <= intThumbHeight)
{
sourceImage.Save(ms, System.DrawingCore.Imaging.ImageFormat.Png);
return(ms);
}
//获取第一张绘制图的大小,(比较 原图的宽/缩略图的宽 和 原图的高/缩略图的高)
if (((decimal)width) / height <= ((decimal)intThumbWidth) / intThumbHeight)
{
smallWidth = intThumbHeight * width / height;
smallHeight = intThumbHeight;
}
else
{
smallWidth = intThumbWidth;
smallHeight = intThumbWidth * height / width;
}
Image newimg = sourceImage.GetThumbnailImage(smallWidth, smallHeight, null, IntPtr.Zero);
//使用原宽高比输出，不补足空白
if (!gap)
{
newimg.Save(ms, System.DrawingCore.Imaging.ImageFormat.Png);
return(ms);
}
//新建一个图板,以最小等比例压缩大小绘制原图
using (System.DrawingCore.Image bitmap = new System.DrawingCore.Bitmap(smallWidth, smallHeight))
{
//绘制中间图
using (System.DrawingCore.Graphics g = System.DrawingCore.Graphics.FromImage(bitmap))
{
//高清,平滑
g.InterpolationMode = System.DrawingCore.Drawing2D.InterpolationMode.High;
g.SmoothingMode = System.DrawingCore.Drawing2D.SmoothingMode.HighQuality;
g.Clear(Color.Transparent);
g.DrawImage(
sourceImage,
new System.DrawingCore.Rectangle(0, 0, smallWidth, smallHeight),
new System.DrawingCore.Rectangle(0, 0, width, height),
System.DrawingCore.GraphicsUnit.Pixel
);
}
//新建一个图板,以缩略图大小绘制中间图
using (System.DrawingCore.Image bitmap1 = new System.DrawingCore.Bitmap(intThumbWidth, intThumbHeight))
{
//绘制缩略图
using (System.DrawingCore.Graphics g = System.DrawingCore.Graphics.FromImage(bitmap1))
{
//高清,平滑
g.InterpolationMode = System.DrawingCore.Drawing2D.InterpolationMode.High;
g.SmoothingMode = System.DrawingCore.Drawing2D.SmoothingMode.HighQuality;
g.Clear(Color.Transparent);
int lwidth = (smallWidth - intThumbWidth) / 2;
int bheight = (smallHeight - intThumbHeight) / 2;
g.DrawImage(bitmap, new Rectangle(0, 0, intThumbWidth, intThumbHeight), lwidth, bheight, intThumbWidth, intThumbHeight, GraphicsUnit.Pixel);
g.Dispose();
bitmap1.Save(ms, System.DrawingCore.Imaging.ImageFormat.Png);
return(ms);
}
}
}
}
}
