这个功能一共有两部分组成,第一部分是窗体代码，另外的一部分是一个辅助方法。直接贴出代码，以供大家参考：
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 点击打开图像
public string strHeadImagePath; //打开图片的路径
Bitmap Bi; //定义位图对像
private void button1_Click(object sender, EventArgs e)
{
openFileDialog1.Filter = "*.gif|*.jpg|*.JPEG|*.JPEG|*.bmp|*.bmp"; //设置读取图片类型
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
try
{
strHeadImagePath = openFileDialog1.FileName;
//this.Show(strHeadImagePath);
Bi = new Bitmap(strHeadImagePath); //使用打开的图片路径创建位图对像
ImageCut1 IC = new ImageCut1(40, 112, this.pictureBox1.Width, this.pictureBox1.Height); //实例化ImageCut类，四个参数据分别表示为：x、y、width、heigth，（40、112）表示pictureBox1的Lcation的坐标，（120、144）表示pictureBox1控件的宽度和高度
this.pictureBox1.Image = IC.KiCut1((Bitmap)(this.GetSelectImage(this.pictureBox1.Width, this.pictureBox1.Height))); //（120、144）表示pictureBox1控件的宽度和高度
//this.pictureBox1.Image = (this.GetSelectImage(120, 144));
}
catch (Exception ex)
{
MessageBox.Show("格式不对");
ex.ToString();
}
}
}
#endregion
#region 定义显示图像方法，即将打开的图像在pictureBox1控件显示
public void Show(string strHeadImagePath)
{
this.pictureBox1.Load(@strHeadImagePath); //
}
#endregion
#region 获取图像
/// <summary>
/// 获取指定宽度和高度的图像即使图片和pictureBox1控件一样宽和高，返回值为图片Image
/// </summary>
/// <param name="Width表示宽"></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;
//原图宽高均小于模版，不作处理，直接保存
if (initImage.Width <= Width && initImage.Height <= Height)
{
//initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);
return initImage;
}
else
{
//原始图片的宽、高
int initWidth = initImage.Width;
int initHeight = initImage.Height;
//非正方型先裁剪为正方型
if (initWidth != initHeight)
{
//截图对象
System.Drawing.Image pickedImage = null;
System.Drawing.Graphics pickedG = null;
//宽大于高的横图
if (initWidth > initHeight)
{
//对象实例化
pickedImage = new System.Drawing.Bitmap(initHeight, initHeight);
pickedG = System.Drawing.Graphics.FromImage(pickedImage);
//设置质量
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);
//画图
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
//重置宽
initWidth = initHeight;
}
//高大于宽的竖图
else
{
//对象实例化
pickedImage = new System.Drawing.Bitmap(initWidth, initWidth);
pickedG = System.Drawing.Graphics.FromImage(pickedImage);
//设置质量
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);
//画图
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
//重置高
initHeight = initWidth;
}
initImage = (System.Drawing.Image)pickedImage.Clone();
// //释放截图资源
pickedG.Dispose();
pickedImage.Dispose();
}
return initImage;
}
}
#endregion
#region 点击button2按钮事件
private void button2_Click(object sender, EventArgs e)
{
this.label1.Text = "裁剪后的图片宽度："+this.pictureBox2.Width.ToString();
this.label2.Text = "裁剪后的图片高度："+this.pictureBox2.Height.ToString();
}
#endregion
#region 缩放、裁剪图像用到的变量
/// <summary>
///
/// </summary>
int x1; //鼠标按下时横坐标
int y1; //鼠标按下时纵坐标
int width; //所打开的图像的宽
int heigth; //所打开的图像的高
bool HeadImageBool = false; // 此布尔变量用来判断pictureBox1控件是否有图片
#endregion
#region 画矩形使用到的变量
Point p1; //定义鼠标按下时的坐标点
Point p2; //定义移动鼠标时的坐标点
Point p3; //定义松开鼠标时的坐标点
#endregion
#region 鼠标按下时发生的事件
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 移动鼠标发生的事件
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) //当鼠标从左上角向开始移动时P3坐标
{
this.p3 = new Point(p1.X, p1.Y);
}
if ((p2.X - p1.X) < 0 && (p2.Y - p1.Y) > 0) //当鼠标从右上角向左下方向开始移动时P3坐标
{
this.p3 = new Point(p2.X, p1.Y);
}
if ((p2.X - p1.X) > 0 && (p2.Y - p1.Y) < 0) //当鼠标从左下角向上开始移动时P3坐标
{
this.p3 = new Point(p1.X, p2.Y);
}
if ((p2.X - p1.X) < 0 && (p2.Y - p1.Y) < 0) //当鼠标从右下角向左方向上开始移动时P3坐标
{
this.p3 = new Point(p2.X, p2.Y);
}
this.pictureBox1.Invalidate(); //使控件的整个图面无效，并导致重绘控件
}
}
#endregion
#region 松开鼠标发生的事件，实例化ImageCut1类对像
ImageCut1 IC1; //定义所画矩形的图像对像
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) //当鼠标从左上角向右下方向开始移动时发生
{
IC1 = new ImageCut1(x1, y1, Math.Abs(e.X - x1), Math.Abs(e.Y - y1)); //实例化ImageCut1类
}
if ((e.X - x1) < 0 && (e.Y - y1) > 0) //当鼠标从右上角向左下方向开始移动时发生
{
IC1 = new ImageCut1(e.X, y1, Math.Abs(e.X - x1), Math.Abs(e.Y - y1)); //实例化ImageCut1类
}
if ((e.X - x1) > 0 && (e.Y - y1) < 0) //当鼠标从左下角向右上方向开始移动时发生
{
IC1 = new ImageCut1(x1, e.Y, Math.Abs(e.X - x1), Math.Abs(e.Y - y1)); //实例化ImageCut1类
}
if ((e.X - x1) < 0 && (e.Y - y1) < 0) //当鼠标从右下角向左上方向开始移动时发生
{
IC1 = new ImageCut1(e.X, e.Y, Math.Abs(e.X - x1), Math.Abs(e.Y - y1)); //实例化ImageCut1类
}
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 获取所选矩形图像
/// <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;
//原图宽高均小于模版，不作处理，直接保存
if (initImage.Width <= Width && initImage.Height <= Height)
{
//initImage.Save(fileSaveUrl, System.Drawing.Imaging.ImageFormat.Jpeg);
return initImage;
}
else
{
//原始图片的宽、高
int initWidth = initImage.Width;
int initHeight = initImage.Height;
//非正方型先裁剪为正方型
if (initWidth != initHeight)
{
//截图对象
System.Drawing.Image pickedImage = null;
System.Drawing.Graphics pickedG = null;
//宽大于高的横图
if (initWidth > initHeight)
{
//对象实例化
pickedImage = new System.Drawing.Bitmap(initHeight, initHeight);
pickedG = System.Drawing.Graphics.FromImage(pickedImage);
//设置质量
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);
//画图
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
//重置宽
initWidth = initHeight;
}
//高大于宽的竖图
else
{
//对象实例化
pickedImage = new System.Drawing.Bitmap(initWidth, initWidth);
pickedG = System.Drawing.Graphics.FromImage(pickedImage);
//设置质量
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);
//画图
pickedG.DrawImage(initImage, toR, fromR, System.Drawing.GraphicsUnit.Pixel);
//重置高
initHeight = initWidth;
}
initImage = (System.Drawing.Image)pickedImage.Clone();
// //释放截图资源
pickedG.Dispose();
pickedImage.Dispose();
}
return initImage;
}
}
#endregion
#region 重新绘制pictureBox1控件，即移动鼠标画矩形
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
if (HeadImageBool)
{
Pen p = new Pen(Color.Black, 1);//画笔
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
}
}
第二部分是辅助方法类
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 剪裁图片方法
/// <summary>
/// 剪裁 -- 用GDI+
/// </summary>
/// <param name="b">原始Bitmap,即需要裁剪的图片</param>
/// <param name="StartX">开始坐标X</param>
/// <param name="StartY">开始坐标Y</param>
/// <param name="iWidth">宽度</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); //所画的矩形正确，它指定所绘制图像的位置和大小。 将图像进行缩放以适合该矩形。
// Create rectangle for source image.
Rectangle srcRect = new Rectangle(X, Y, Width, Height); //srcRect参数指定要绘制的 image 对象的矩形部分。 将此部分进行缩放以适合 destRect 参数所指定的矩形。
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类的构造函数
public int X;
public int Y;
public int Width ;
public int Height;
/// <summary>
/// ImageCut1类的构造函数，ImageCut1类用来获取鼠标在pictureBox1控件所画矩形内的图像
/// </summary>
/// <param name="x表示鼠标在pictureBox1控件上按下时的横坐标"></param>
/// <param name="y表示鼠标在pictureBox1控件上按下时的纵坐标"></param>
/// <param name="width表示鼠标在pictureBox1控件上松开鼠标的宽度"></param>
/// <param name="heigth表示鼠标在pictureBox1控件上松开鼠标的高度"></param>
public ImageCut1(int x, int y, int width, int heigth)
{
X = x;
Y = y;
Width = width;
Height = heigth;
}
#endregion
}
}
实现的效果如下：
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持悠悠之家。
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