C# 图片处理 将 图片数组将图片缩放为指定大小

using System;

using System.Collections.Generic;

//using System.Linq;

using System.Text;

using System.IO;

using System.Drawing;

using System.Data;

using System.Drawing.Imaging;

namespace Common

{

/// <summary>

/// 图片处理

/// </summary>

public class ImageProvider

{

/// <summary>

/// 将Image转化为byte数组

/// </summary>

/// <param name="imageIn">图片</param>

/// <returns></returns>

public static byte[] imageToByteArray(System.Drawing.Image imageIn)

{

if (imageIn == null)

return null;

MemoryStream ms = new MemoryStream();

imageIn.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

return ms.ToArray();

}

/// <summary>

/// 将byte数组转化为Image

/// </summary>

/// <param name="byteArrayIn">图片数组</param>

/// <returns></returns>

public static Image byteArrayToImage(byte[] byteArrayIn)

{

if (byteArrayIn == null || byteArrayIn.Length == 0)

return null;

MemoryStream ms = new MemoryStream(byteArrayIn);

Image returnImage = Image.FromStream(ms);

return returnImage;

}

/// <summary>

/// 将图片缩放为指定大小

/// </summary>

/// <param name="originalImagePath">源图片路径</param>

/// <param name="thumbnailPath">缩放后图片存放路径</param>

/// <param name="width">缩放图片宽</param>

/// <param name="height">缩放图片高</param>

/// <param name="zoomtype">缩放类型</param>

public static void MakeThumbnail(string originalImagePath, string thumbnailPath, int width, int height, ZoomType zoomtype)

{

Image originalImage = Image.FromFile(originalImagePath);

int towidth = width;

int toheight = height;

int x = 0;

int y = 0;

int ow = originalImage.Width;

int oh = originalImage.Height;

switch (zoomtype)

{

case ZoomType.HW://指定高宽缩放（可能变形）

break;

case ZoomType.W://指定宽，高按比例

toheight = originalImage.Height * width / originalImage.Width;

break;

case ZoomType.H://指定高，宽按比例

towidth = originalImage.Width * height / originalImage.Height;

break;

case ZoomType.Cut://指定高宽裁减（不变形）

if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)

{

oh = originalImage.Height;

ow = originalImage.Height * towidth / toheight;

y = 0;

x = (originalImage.Width - ow) / 2;

}

else

{

ow = originalImage.Width;

oh = originalImage.Width * height / towidth;

x = 0;

y = (originalImage.Height - oh) / 2;

}

break;

default:

break;

}

//新建一个bmp图片

Image bitmap = new System.Drawing.Bitmap(towidth, toheight);

//新建一个画板

Graphics g = System.Drawing.Graphics.FromImage(bitmap);

//设置高质量插值法

g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

//设置高质量,低速度呈现平滑程度

g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

//清空画布并以透明背景色填充

g.Clear(Color.Transparent);

//在指定位置并且按指定大小绘制原图片的指定部分

g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight),

new Rectangle(x, y, ow, oh),

GraphicsUnit.Pixel);

try

{

//以jpg格式保存缩略图

bitmap.Save(thumbnailPath, System.Drawing.Imaging.ImageFormat.Jpeg);

}

catch (System.Exception e)

{

throw e;

}

finally

{

originalImage.Dispose();

bitmap.Dispose();

g.Dispose();

}

}

/// <summary>

/// 将图片缩放为指定大小

/// </summary>

/// <param name="originalImagePath">源图片路径</param>

/// <param name="width">缩放图片宽</param>

/// <param name="height">缩放图片高</param>

/// <param name="mode">缩放类型</param>

/// <returns></returns>

public static Image RetrunImage(string originalImagePath, int width, int height, ZoomType zoomtype)

{

Image originalImage = Image.FromFile(originalImagePath);

int towidth = width;

int toheight = height;

int x = 0;

int y = 0;

int ow = originalImage.Width;

int oh = originalImage.Height;

switch (zoomtype)

{

case ZoomType.HW://指定高宽缩放（可能变形）

break;

case ZoomType.W://指定宽，高按比例

toheight = originalImage.Height * width / originalImage.Width;

break;

case ZoomType.H://指定高，宽按比例

towidth = originalImage.Width * height / originalImage.Height;

break;

case ZoomType.Cut://指定高宽裁减（不变形）

if ((double)originalImage.Width / (double)originalImage.Height > (double)towidth / (double)toheight)

{

oh = originalImage.Height;

ow = originalImage.Height * towidth / toheight;

y = 0;

x = (originalImage.Width - ow) / 2;

}

else

{

ow = originalImage.Width;

oh = originalImage.Width * height / towidth;

x = 0;

y = (originalImage.Height - oh) / 2;

}

break;

default:

break;

}

//新建一个bmp图片

Image bitmap = new System.Drawing.Bitmap(towidth, toheight);

//新建一个画板

Graphics g = System.Drawing.Graphics.FromImage(bitmap);

//设置高质量插值法

g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

//设置高质量,低速度呈现平滑程度

g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

//清空画布并以透明背景色填充

g.Clear(Color.Transparent);

//g.Clear(ColorTranslator.FromHtml("#fffbd9"));

//在指定位置并且按指定大小绘制原图片的指定部分

g.DrawImage(originalImage, new Rectangle(0, 0, towidth, toheight), new Rectangle(x, y, ow, oh), GraphicsUnit.Pixel);

try

{

//以jpg格式保存缩略图

return bitmap;

}

catch (System.Exception e)

{

throw e;

}

finally

{

originalImage.Dispose();

// bitmap.Dispose(); 一定不能有 不然返回图片出错

g.Dispose();

}

}

/// <summary>

/// 以逆时针为方向对图像进行旋转

/// </summary>

/// <param name="b">位图流</param>

/// <param name="angle">旋转角度[0,360](前台给的)</param>

/// <returns></returns>

public static Bitmap Rotate(Bitmap b, int angle)

{

angle = angle % 360; //弧度转换

double radian = angle * Math.PI / 180.0;

double cos = Math.Cos(radian);

double sin = Math.Sin(radian);

//原图的宽和高

int w = b.Width;

int h = b.Height;

int W = (int)(Math.Max(Math.Abs(w * cos - h * sin), Math.Abs(w * cos + h * sin)));

int H = (int)(Math.Max(Math.Abs(w * sin - h * cos), Math.Abs(w * sin + h * cos)));

//目标位图

Bitmap dsImage = new Bitmap(W, H);

System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(dsImage);

g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bilinear;

g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

//计算偏移量

Point Offset = new Point((W - w) / 2, (H - h) / 2);

//构造图像显示区域：让图像的中心与窗口的中心点一致

Rectangle rect = new Rectangle(Offset.X, Offset.Y, w, h);

Point center = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2);

g.TranslateTransform(center.X, center.Y);

g.RotateTransform(360 - angle);

//恢复图像在水平和垂直方向的平移

g.TranslateTransform(-center.X, -center.Y);

g.DrawImage(b, rect);

//重至绘图的所有变换

g.ResetTransform();

g.Save();

g.Dispose();

//dsImage.Save("yuancd.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);

return dsImage;

}

/// <summary>

///

/// </summary>

/// <param name="ImgTitle"></param>

/// <param name="dt"></param>

/// <param name="optcol"></param>

/// <param name="numcol"></param>

/// <param name="path"></param>

public void GetRectangleImage(string ImgTitle, DataTable dt, string optcol, string numcol, string path)

{

int ImageWidth = dt.Rows.Count * 60 + 120;

if (ImageWidth < 200)

{

ImageWidth = ImageWidth + 150;

}

Bitmap objBitMap = new Bitmap(ImageWidth, 240);

Graphics objGraphics;

objGraphics = Graphics.FromImage(objBitMap);

objGraphics.Clear(Color.White);

objGraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

objGraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

objGraphics.DrawString(ImgTitle, new Font("宋体", 10), Brushes.DarkBlue, new PointF(90, 5));

string maxHight = dt.Select("", "" + numcol + " DESC", DataViewRowState.CurrentRows)[0][numcol].ToString();

int rate = 0;

if (maxHight.Length < 2) //like <10

{

rate = 1;

}

else if (maxHight.Length < 3)// <100

{

rate = 10;

}

else if (maxHight.Length < 4)

{

rate = 100;

}

else if (maxHight.Length < 5)

{

rate = 1000;

}

else if (maxHight.Length < 6)

{

rate = 10000;

}

else if (maxHight.Length < 7)

{

rate = 100000;

}

else

{

rate = 1000000;

}

int i = 0; int curX = 0; int curY = 0;

foreach (DataRow dr in dt.Rows)

{

i++;

double num = Convert.ToInt32(dr[numcol]) / rate * 20;

int numHeight = (int)Math.Round(num, 0);

curX = i * 60 + 35;

curY = 220 - numHeight;

objGraphics.FillRectangle(new SolidBrush(GetColor(i)), curX, curY, 25, numHeight + 5);

objGraphics.DrawRectangle(Pens.Black, curX, curY, 25, numHeight + 5);

PointF descLeg = new PointF(curX, 230);

string option = dr[optcol].ToString().Length > 8 ? dr[optcol].ToString().Substring(0, 8) : dr[optcol].ToString();

objGraphics.DrawString(option, new Font("宋体", 7), Brushes.Black, descLeg);

PointF numLeg = new PointF(curX, curY - 15);//add 10

objGraphics.DrawString(dr[numcol].ToString(), new Font("Arial", 8), Brushes.Blue, numLeg);

}

///x and y raw

Point pfrom = new Point(50, 225);

Point pto = new Point(ImageWidth, 225);

objGraphics.DrawLine(Pens.Black, pfrom, pto);

Point pvfrom = new Point(50, 0);

Point pvto = new Point(50, 225);

objGraphics.DrawLine(Pens.OrangeRed, pvfrom, pvto);

///step

///

for (int j = 0; j < 11; j++)

{

Point ppfrom = new Point(50, 225 - j * 20);

Point ppto = new Point(54, 225 - j * 20);

objGraphics.DrawLine(Pens.DarkOrange, ppfrom, ppto);

int stepNum = rate * j;

objGraphics.DrawString(stepNum.ToString(), new Font("Arial", 8), Brushes.DarkBlue, new PointF(5, 220 - j * 20));

}

objBitMap.Save(path, ImageFormat.Jpeg);

objGraphics.Dispose();

objBitMap.Dispose();

}

/// <summary>

///

/// </summary>

/// <param name="Title"></param>

/// <param name="dt"></param>

/// <param name="numcol"></param>

/// <param name="optcol"></param>

/// <param name="ratecol"></param>

/// <param name="path"></param>

public void GetPieImage(string Title, DataTable dt, string numcol, string optcol, string ratecol, string path)

{

int ImgHight = dt.Rows.Count * 20 + 220;

Bitmap objBitMap = new Bitmap(650, ImgHight);

Graphics objGraphics;

objGraphics = Graphics.FromImage(objBitMap);

objGraphics.Clear(Color.Transparent);

objGraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

objGraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

objGraphics.DrawString(Title, new Font("宋体", 10), Brushes.DarkBlue, new PointF(5, 5));

PointF symbolLeg = new PointF(200, 50);

PointF descLeg = new PointF(230, 48);

float sglCurrentAngle = 0;

float sglTotalAngle = 0;

int k = 0;

foreach (DataRow dr in dt.Rows)

{

k++;

float ratio = float.Parse(dr[ratecol].ToString()) / 10;//100;

sglCurrentAngle = ratio * 36;

objGraphics.FillRectangle(new SolidBrush(GetColor(k)), symbolLeg.X, symbolLeg.Y, 20, 10);

objGraphics.DrawRectangle(Pens.Black, symbolLeg.X, symbolLeg.Y, 20, 10);

string opt = dr[optcol].ToString().Length > 18 ? dr[optcol].ToString().Substring(0, 18) : dr[optcol].ToString();

objGraphics.DrawString(opt + " Count:" + dr[numcol] + " Ratio:" + dr[ratecol] + "%", new Font("宋体", 10), Brushes.Black, descLeg);

symbolLeg.Y += 15;

descLeg.Y += 15;

objGraphics.FillPie(new SolidBrush(GetColor(k)), 20, 80, 150, 150, sglTotalAngle, sglCurrentAngle);

objGraphics.DrawPie(Pens.Black, 20, 80, 150, 150, sglTotalAngle, sglCurrentAngle);

sglTotalAngle += sglCurrentAngle;

}

objBitMap.Save(path, ImageFormat.Jpeg);

objGraphics.Dispose();

objBitMap.Dispose();

}

/// <summary>

///

/// </summary>

/// <param name="ImgTitle"></param>

/// <param name="dt"></param>

/// <param name="optColName"></param>

/// <param name="numColName"></param>

/// <param name="path"></param>

public void GetLineImage(string ImgTitle, DataTable dt, string optColName, string numColName, string path)

{

int ImageWidth = dt.Rows.Count * 70 + 120;

if (ImageWidth < 200)

{

ImageWidth = ImageWidth + 150;

}

Bitmap objBitMap = new Bitmap(ImageWidth, 240);

Graphics objGraphics;

objGraphics = Graphics.FromImage(objBitMap);

objGraphics.Clear(Color.Transparent);

objGraphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

objGraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

objGraphics.DrawString(ImgTitle, new Font("宋体", 10), Brushes.DarkBlue, new PointF(90, 5));

string maxHight = dt.Select("", "" + numColName + " DESC", DataViewRowState.CurrentRows)[0][numColName].ToString();

int rate = 0;

if (maxHight.Length < 2) //like <10

{

rate = 1;

}

else if (maxHight.Length < 3)// <100

{

rate = 10;

}

else if (maxHight.Length < 4)

{

rate = 100;

}

else if (maxHight.Length < 5)

{

rate = 1000;

}

else if (maxHight.Length < 6)

{

rate = 10000;

}

else if (maxHight.Length < 7)

{

rate = 100000;

}

else

{

rate = 1000000;

}

int i = 0;

int LineX = 50; int LineY = 225;

int curLineX = 0; int curLineY = 0;

foreach (DataRow dr in dt.Rows)

{

i++;

if (i > 20) break;

double num = Convert.ToInt32(dr[numColName]) / rate * 20;

int numHeight = (int)Math.Round(num, 0);

curLineX = (i * 70) + 30;

curLineY = 225 - numHeight;

objGraphics.DrawLine(Pens.DarkBlue, new Point(LineX, LineY), new Point(curLineX, curLineY));

LineX = curLineX;

LineY = curLineY;

PointF descLeg = new PointF(curLineX, 230);

string option = dr[optColName].ToString().Length > 8 ? dr[optColName].ToString().Substring(0, 8) : dr[optColName].ToString();

objGraphics.DrawString(option, new Font("宋体", 7), Brushes.Black, descLeg);

PointF numLeg = new PointF(curLineX, 205 - numHeight);//add 10

objGraphics.DrawString(dr[numColName].ToString(), new Font("Arial", 8), Brushes.Black, numLeg);

objGraphics.DrawEllipse(new Pen(Brushes.Black), curLineX, 223, 2, 3);

objGraphics.FillEllipse(Brushes.DarkBlue, curLineX, 223, 2, 3);

}

///x and y raw

Point pfrom = new Point(50, 225);

Point pto = new Point(ImageWidth, 225);

objGraphics.DrawLine(Pens.Black, pfrom, pto);

Point pvfrom = new Point(50, 0);

Point pvto = new Point(50, 225);

objGraphics.DrawLine(Pens.DarkOrange, pvfrom, pvto);

///step

///

for (int j = 0; j < 11; j++)

{

Point ppfrom = new Point(50, 225 - j * 20);

Point ppto = new Point(54, 225 - j * 20);

objGraphics.DrawLine(Pens.Orange, ppfrom, ppto);

int stepNum = rate * j;

objGraphics.DrawString(stepNum.ToString(), new Font("Arial", 8), Brushes.DarkBlue, new PointF(5, 220 - j * 20));

}

objBitMap.Save(path, ImageFormat.Jpeg);

objGraphics.Dispose();

objBitMap.Dispose();

}

/// <summary>

///

/// </summary>

/// <param name="itemIndex"></param>

/// <returns></returns>

private Color GetColor(int itemIndex)

{

Color objColor;

string lastNumeric = itemIndex.ToString();

if (lastNumeric.Length > 1)

{

lastNumeric = lastNumeric.Substring(lastNumeric.Length - 1);

}

if (lastNumeric == "0")

{

objColor = Color.OrangeRed;

}

else if (lastNumeric == "1")

{

objColor = Color.LimeGreen;

}

else if (lastNumeric == "2")

{

objColor = Color.Orange;

}

else if (lastNumeric == "3")

{

objColor = Color.AliceBlue;

}

else if (lastNumeric == "4")

{

objColor = Color.Yellow;

}

else if (lastNumeric == "5")

{

objColor = Color.Red;

}

else if (lastNumeric == "6")

{

objColor = Color.SteelBlue; //ColorTranslator.FromHtml("");

}

else if (lastNumeric == "7")

{

objColor = Color.GreenYellow;

}

else if (lastNumeric == "8")

{

objColor = Color.Goldenrod;

}

else //if (itemIndex == 9)

{

objColor = Color.IndianRed;

}

return objColor;

}

}

/// <summary>

/// 缩放类型

/// </summary>

public enum ZoomType

{

/// <summary>

/// 指定高宽缩放（可能变形）

/// </summary>

HW,

/// <summary>

/// 指定高，宽按比例

/// </summary>

H,

/// <summary>

/// 指定宽，高按比例

/// </summary>

W,

/// <summary>

/// 指定高宽裁减（不变形）

/// </summary>

Cut

}

}