C# 實(shí)現(xiàn)QQ式截圖功能實(shí)例代碼

來源：本站原創(chuàng)|時間：2020-01-10|欄目：C#教程|點(diǎn)擊：次

這個功能一共有兩部分組成,第一部分是窗體代碼，另外的一部分是一個輔助方法。直接貼出代碼，以供大家參考：

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.Drawing.Drawing2D;
using System.Drawing.Imaging;
using ImageClassLib;
namespace ImageShear
{
  public partial class Demo: Form
  {
    public Demo()
    {
      InitializeComponent();
    }
    #region 點(diǎn)擊打開圖像
    public string strHeadImagePath; //打開圖片的路徑
    Bitmap Bi; //定義位圖對像
    private void button1_Click(object sender, EventArgs e)
    {
      openFileDialog1.Filter = "*.gif|*.jpg|*.JPEG|*.JPEG|*.bmp|*.bmp";     //設(shè)置讀取圖片類型
      if (openFileDialog1.ShowDialog() == DialogResult.OK)
      {
        try
        {
          strHeadImagePath = openFileDialog1.FileName;
          //this.Show(strHeadImagePath);
          Bi = new Bitmap(strHeadImagePath); //使用打開的圖片路徑創(chuàng)建位圖對像
          ImageCut1 IC = new ImageCut1(40, 112, this.pictureBox1.Width, this.pictureBox1.Height);   //實(shí)例化ImageCut類，四個參數(shù)據(jù)分別表示為：x、y、width、heigth，（40、112）表示pictureBox1的Lcation的坐標(biāo)，（120、144）表示pictureBox1控件的寬度和高度
          this.pictureBox1.Image = IC.KiCut1((Bitmap)(this.GetSelectImage(this.pictureBox1.Width, this.pictureBox1.Height)));   //（120、144）表示pictureBox1控件的寬度和高度
          //this.pictureBox1.Image = (this.GetSelectImage(120, 144));
        }
        catch (Exception ex)
        {
          MessageBox.Show("格式不對");
          ex.ToString();
        }
      }
    }
    #endregion
    #region 定義顯示圖像方法，即將打開的圖像在pictureBox1控件顯示
    public void Show(string strHeadImagePath)
    {
      this.pictureBox1.Load(@strHeadImagePath);  //
    }
    #endregion
    #region 獲取圖像
    /// <summary>
    /// 獲取指定寬度和高度的圖像即使圖片和pictureBox1控件一樣寬和高，返回值為圖片Image
    /// </summary>
    /// <param name="Width表示寬"></param>
    /// <param name="Height表示高"></param>
    /// <returns></returns>
    public Image GetSelectImage(int Width, int Height)
    {
      //Image initImage = this.pictureBox1.Image;
      Image initImage = Bi;
      //原圖寬高均小于模版，不作處理，直接保存 
      if (initImage.Width <= Width && initImage.Height <= Height)
      {
        //initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);
        return initImage;
      }
      else
      {
        //原始圖片的寬、高 
        int initWidth = initImage.Width;
        int initHeight = initImage.Height;

        //非正方型先裁剪為正方型 
        if (initWidth != initHeight)
        {
          //截圖對象 
          System.Drawing.Image pickedImage = null;
          System.Drawing.Graphics pickedG = null;

          //寬大于高的橫圖 
          if (initWidth > initHeight)
          {
            //對象實(shí)例化 
            pickedImage = new System.Drawing.Bitmap(initHeight, initHeight);
            pickedG = System.Drawing.Graphics.FromImage(pickedImage);
            //設(shè)置質(zhì)量 
            pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            //定位 
            Rectangle fromR = new Rectangle((initWidth - initHeight) / 2, 0, initHeight, initHeight);
            Rectangle toR = new Rectangle(0, 0, initHeight, initHeight);
            //畫圖 
            pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
            //重置寬 
            initWidth = initHeight;
          }
          //高大于寬的豎圖 
          else
          {
            //對象實(shí)例化
            pickedImage = new System.Drawing.Bitmap(initWidth, initWidth);
            pickedG = System.Drawing.Graphics.FromImage(pickedImage);
            //設(shè)置質(zhì)量 
            pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            //定位 
            Rectangle fromR = new Rectangle(0, (initHeight - initWidth) / 2, initWidth, initWidth);
            Rectangle toR = new Rectangle(0, 0, initWidth, initWidth);
            //畫圖 
            pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
            //重置高 
            initHeight = initWidth;
          }

          initImage = (System.Drawing.Image)pickedImage.Clone();
          //        //釋放截圖資源 
          pickedG.Dispose();
          pickedImage.Dispose();
        }

        return initImage;
      }
    }
    #endregion
    #region 點(diǎn)擊button2按鈕事件
    private void button2_Click(object sender, EventArgs e)
    {
      this.label1.Text = "裁剪后的圖片寬度："+this.pictureBox2.Width.ToString();
      this.label2.Text = "裁剪后的圖片高度："+this.pictureBox2.Height.ToString();
    }
    #endregion
    #region 縮放、裁剪圖像用到的變量
    /// <summary>
    /// 
    /// </summary>
    int x1;   //鼠標(biāo)按下時橫坐標(biāo)
    int y1;   //鼠標(biāo)按下時縱坐標(biāo)
    int width; //所打開的圖像的寬
    int heigth; //所打開的圖像的高
    bool HeadImageBool = false;  // 此布爾變量用來判斷pictureBox1控件是否有圖片
    #endregion
    #region 畫矩形使用到的變量
    Point p1;  //定義鼠標(biāo)按下時的坐標(biāo)點(diǎn)
    Point p2;  //定義移動鼠標(biāo)時的坐標(biāo)點(diǎn)
    Point p3;  //定義松開鼠標(biāo)時的坐標(biāo)點(diǎn)
    #endregion
    #region 鼠標(biāo)按下時發(fā)生的事件
    private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
    {
      this.Cursor = Cursors.Cross;
      this.p1 = new Point(e.X, e.Y);
      x1 = e.X;
      y1 = e.Y;
      if (this.pictureBox1.Image != null)
      {
        HeadImageBool = true;
      }
      else
      {
        HeadImageBool = false;
      }
    }
    #endregion
    #region 移動鼠標(biāo)發(fā)生的事件
    private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
    {
      if (this.Cursor == Cursors.Cross)
      {
        this.p2 = new Point(e.X, e.Y);
        if ((p2.X - p1.X) > 0 && (p2.Y - p1.Y) > 0)   //當(dāng)鼠標(biāo)從左上角向開始移動時P3坐標(biāo)
        {
          this.p3 = new Point(p1.X, p1.Y);
        }
        if ((p2.X - p1.X) < 0 && (p2.Y - p1.Y) > 0)   //當(dāng)鼠標(biāo)從右上角向左下方向開始移動時P3坐標(biāo)
        {
          this.p3 = new Point(p2.X, p1.Y);
        }
        if ((p2.X - p1.X) > 0 && (p2.Y - p1.Y) < 0)   //當(dāng)鼠標(biāo)從左下角向上開始移動時P3坐標(biāo)
        {
          this.p3 = new Point(p1.X, p2.Y);
        }
        if ((p2.X - p1.X) < 0 && (p2.Y - p1.Y) < 0)   //當(dāng)鼠標(biāo)從右下角向左方向上開始移動時P3坐標(biāo)
        {
          this.p3 = new Point(p2.X, p2.Y);
        }
        this.pictureBox1.Invalidate(); //使控件的整個圖面無效，并導(dǎo)致重繪控件
      }
    }
    #endregion
    #region 松開鼠標(biāo)發(fā)生的事件，實(shí)例化ImageCut1類對像
    ImageCut1 IC1; //定義所畫矩形的圖像對像
    private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
    {
      if (HeadImageBool)
      {
        width = this.pictureBox1.Image.Width;
        heigth = this.pictureBox1.Image.Height;
        if ((e.X - x1) > 0 && (e.Y - y1) > 0)  //當(dāng)鼠標(biāo)從左上角向右下方向開始移動時發(fā)生
        {
          IC1 = new ImageCut1(x1, y1, Math.Abs(e.X - x1), Math.Abs(e.Y - y1));  //實(shí)例化ImageCut1類
        }
        if ((e.X - x1) < 0 && (e.Y - y1) > 0)  //當(dāng)鼠標(biāo)從右上角向左下方向開始移動時發(fā)生
        {
          IC1 = new ImageCut1(e.X, y1, Math.Abs(e.X - x1), Math.Abs(e.Y - y1));  //實(shí)例化ImageCut1類
        }
        if ((e.X - x1) > 0 && (e.Y - y1) < 0)  //當(dāng)鼠標(biāo)從左下角向右上方向開始移動時發(fā)生
        {
          IC1 = new ImageCut1(x1, e.Y, Math.Abs(e.X - x1), Math.Abs(e.Y - y1));  //實(shí)例化ImageCut1類
        }
        if ((e.X - x1) < 0 && (e.Y - y1) < 0)  //當(dāng)鼠標(biāo)從右下角向左上方向開始移動時發(fā)生
        {
          IC1 = new ImageCut1(e.X, e.Y, Math.Abs(e.X - x1), Math.Abs(e.Y - y1));   //實(shí)例化ImageCut1類
        }
        this.pictureBox2.Width = (IC1.KiCut1((Bitmap)(this.pictureBox1.Image))).Width;
        this.pictureBox2.Height = (IC1.KiCut1((Bitmap)(this.pictureBox1.Image))).Height;
        this.pictureBox2.Image = IC1.KiCut1((Bitmap)(this.pictureBox1.Image));
        this.Cursor = Cursors.Default;
      }
      else
      {
        this.Cursor = Cursors.Default;
      }
    }
    #endregion
    #region 獲取所選矩形圖像
    /// <summary>
    /// 
    /// </summary>
    /// <param name="Width"></param>
    /// <param name="Height"></param>
    /// <returns></returns>
    public Image GetSelectImage1(int Width, int Height)
    {
      Image initImage = this.pictureBox1.Image;
      //Image initImage = Bi;
      //原圖寬高均小于模版，不作處理，直接保存 
      if (initImage.Width <= Width && initImage.Height <= Height)
      {
        //initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);
        return initImage;
      }
      else
      {
        //原始圖片的寬、高 
        int initWidth = initImage.Width;
        int initHeight = initImage.Height;

        //非正方型先裁剪為正方型 
        if (initWidth != initHeight)
        {
          //截圖對象 
          System.Drawing.Image pickedImage = null;
          System.Drawing.Graphics pickedG = null;

          //寬大于高的橫圖 
          if (initWidth > initHeight)
          {
            //對象實(shí)例化 
            pickedImage = new System.Drawing.Bitmap(initHeight, initHeight);
            pickedG = System.Drawing.Graphics.FromImage(pickedImage);
            //設(shè)置質(zhì)量 
            pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            //定位 
            Rectangle fromR = new Rectangle((initWidth - initHeight) / 2, 0, initHeight, initHeight);
            Rectangle toR = new Rectangle(0, 0, initHeight, initHeight);
            //畫圖 
            pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
            //重置寬 
            initWidth = initHeight;
          }
          //高大于寬的豎圖 
          else
          {
            //對象實(shí)例化
            pickedImage = new System.Drawing.Bitmap(initWidth, initWidth);
            pickedG = System.Drawing.Graphics.FromImage(pickedImage);
            //設(shè)置質(zhì)量 
            pickedG.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            pickedG.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            //定位 
            Rectangle fromR = new Rectangle(0, (initHeight - initWidth) / 2, initWidth, initWidth);
            Rectangle toR = new Rectangle(0, 0, initWidth, initWidth);
            //畫圖 
            pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
            //重置高 
            initHeight = initWidth;
          }

          initImage = (System.Drawing.Image)pickedImage.Clone();
          //        //釋放截圖資源 
          pickedG.Dispose();
          pickedImage.Dispose();
        }

        return initImage;
      }
    }
    #endregion
    #region 重新繪制pictureBox1控件，即移動鼠標(biāo)畫矩形
    private void pictureBox1_Paint(object sender, PaintEventArgs e)
    {
      if (HeadImageBool)
      {
        Pen p = new Pen(Color.Black, 1);//畫筆
        p.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
        //Bitmap bitmap = new Bitmap(strHeadImagePath);
        Bitmap bitmap = Bi;
        Rectangle rect = new Rectangle(p3, new Size(System.Math.Abs(p2.X - p1.X), System.Math.Abs(p2.Y - p1.Y)));
        e.Graphics.DrawRectangle(p, rect);
      }
      else
      {

      }
    }
    #endregion
  }
}

第二部分是輔助方法類

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
namespace ImageClassLib
{
  public class ImageCut1
  {
    #region 剪裁圖片方法
    /// <summary> 
    /// 剪裁 -- 用GDI+ 
    /// </summary> 
    /// <param name="b">原始Bitmap,即需要裁剪的圖片</param> 
    /// <param name="StartX">開始坐標(biāo)X</param> 
    /// <param name="StartY">開始坐標(biāo)Y</param> 
    /// <param name="iWidth">寬度</param> 
    /// <param name="iHeight">高度</param> 
    /// <returns>剪裁后的Bitmap</returns> 
    public Bitmap KiCut1(Bitmap b) 
    { 
      if (b == null) 
      { 
        return null; 
      } 
    
      int w = b.Width; 
      int h = b.Height; 
    
      if (X >= w || Y >= h) 
      { 
        return null; 
      } 
    
      if (X + Width > w) 
      { 
        Width = w - X; 
      } 
    
      if (Y + Height > h) 
      { 
        Height = h - Y; 
      } 
    
      try
      { 
        Bitmap bmpOut = new Bitmap(Width, Height, PixelFormat.Format24bppRgb); 
    
        Graphics g = Graphics.FromImage(bmpOut);
        // Create rectangle for displaying image.
        Rectangle destRect = new Rectangle(0, 0, Width, Height);    //所畫的矩形正確，它指定所繪制圖像的位置和大小。 將圖像進(jìn)行縮放以適合該矩形。

        // Create rectangle for source image.
        Rectangle srcRect = new Rectangle(X, Y, Width, Height);   //srcRect參數(shù)指定要繪制的 image 對象的矩形部分。 將此部分進(jìn)行縮放以適合 destRect 參數(shù)所指定的矩形。

        g.DrawImage(b, destRect, srcRect, GraphicsUnit.Pixel);
        //resultG.DrawImage(initImage, new System.Drawing.Rectangle(0, 0, side, side), new System.Drawing.Rectangle(0, 0, initWidth, initHeight), System.Drawing.GraphicsUnit.Pixel);
        g.Dispose(); 
        return bmpOut; 
      } 
      catch
      { 
        return null; 
      } 
    }
    #endregion
    #region ImageCut1類的構(gòu)造函數(shù)
    public int X; 
    public int Y; 
    public int Width ; 
    public int Height;
    /// <summary>
    /// ImageCut1類的構(gòu)造函數(shù)，ImageCut1類用來獲取鼠標(biāo)在pictureBox1控件所畫矩形內(nèi)的圖像
    /// </summary>
    /// <param name="x表示鼠標(biāo)在pictureBox1控件上按下時的橫坐標(biāo)"></param>
    /// <param name="y表示鼠標(biāo)在pictureBox1控件上按下時的縱坐標(biāo)"></param>
    /// <param name="width表示鼠標(biāo)在pictureBox1控件上松開鼠標(biāo)的寬度"></param>
    /// <param name="heigth表示鼠標(biāo)在pictureBox1控件上松開鼠標(biāo)的高度"></param>
    public ImageCut1(int x, int y, int width, int heigth)
    {
      X = x;
      Y = y;
      Width = width;
      Height = heigth;
    }
    #endregion
  }
}

實(shí)現(xiàn)的效果如下：

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持我們。

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