一、需求

Rectangle(Point, Size)

Rectangle(Int32, Int32, Int32, Int32)

二、常用的功能

1.判断两个矩形是否相交

2.求出两矩形相交重叠处的矩形

3.案例

三、切图Demo

结束

一、需求

矩形在开发中非常常见，比如截图功能，GDI+ 画图，Rectangle 的构造函数中，需要提供四个参数，坐标x，y，宽度，高度，另外还封装了其他的一写方法，比如是否相交，两矩形相交处重叠的矩形，根据左上，和右下坐标生成矩形等等方法，下面是构造函数的一些介绍。

构造函数：

Rectangle(Point, Size)

用指定的位置和大小初始化 Rectangle 类的新实例。

public Rectangle (System.Drawing.Point location, System.Drawing.Size size);

参数：location Point Point，它表示矩形区域的左上角。size Size Size，它表示矩形区域的宽度和高度。

Rectangle(Int32, Int32, Int32, Int32)

用指定的位置和大小初始化 Rectangle 类的新实例。

public Rectangle (int x, int y, int width, int height);

参数：x Int32 矩形左上角的 x 坐标。y Int32 矩形左上角的 y 坐标。width Int32 矩形的宽度。height Int32 矩形的高度。

二、常用的功能

1.判断两个矩形是否相交

判断连个矩形是否相交，返回值是布尔类型

Rectangle rectangle1 = new Rectangle(100,100,50,50);
Rectangle rectangle2 = new Rectangle(110,110,50,50);
bool isIntersect = rectangle1.IntersectsWith(rectangle2);

2.求出两矩形相交重叠处的矩形

两个矩形相交后，根据两个矩形的重叠处，得出一个新的矩形

Rectangle rectangle1 = new Rectangle(100,100,50,50);
Rectangle rectangle2 = new Rectangle(110,110,50,50);
Rectangle overlap = Rectangle.Intersect(rectangle1, rectangle2);

3.案例

上面这两个API，下面就用一个案例来展示

效果

上图可以看到，当两个图像重合后，就立马将重合的部分图像显示在旁边的小图中了，另外，我将是否重合的判断输出在控制台中了

界面设计

代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace 矩形
{public partial class Form1 : Form{public Form1(){InitializeComponent();}//图片列表private string Img1Path = Application.StartupPath + "\\test.jpg";//存储矩形列表List<Rectangle> PictureCuttingList = new List<Rectangle>();//边长int SideLength = 180;private void Form1_Load(object sender, EventArgs e){}private void Button_Examine_Click(object sender, EventArgs e){if (!System.IO.File.Exists(Img1Path)){Console.WriteLine("图片路径不存在：" + Img1Path);return;}Bitmap bitmaps = new Bitmap(Img1Path);Random random = new Random();PictureCuttingList.Clear();PictureBox_Coincide.Image = null;for (int i = 0; i < 2; i++){int x = random.Next(10, bitmaps.Width - SideLength);int y = random.Next(10, bitmaps.Height - SideLength);PictureCuttingList.Add(new Rectangle(new Point(x, y), new Size(SideLength, SideLength)));}//给图片画矩形PictureBox_Template.Image = PaintingRectangle(PictureCuttingList, bitmaps);//判断两个矩形是否相交Rectangle rectangle1 = PictureCuttingList[0];Rectangle rectangle2 = PictureCuttingList[1];bool isRect = rectangle1.IntersectsWith(rectangle2);Console.WriteLine("两个矩形是否相交：" + isRect);if (isRect){//两个矩形相交部分图片显示到小图中Rectangle overlap = Rectangle.Intersect(rectangle1, rectangle2);Bitmap newBitmap = new Bitmap(Img1Path);Bitmap cuttingBitmap = newBitmap.Clone(overlap, System.Drawing.Imaging.PixelFormat.DontCare);PictureBox_Coincide.Image = cuttingBitmap;}}/// <summary>/// 给图片画矩形/// </summary>/// <param name="rectanglesList"></param>/// <param name="bitmap"></param>public Bitmap PaintingRectangle(List<Rectangle> rectanglesList, Bitmap bitmap){Bitmap bit = null;for (int i = 0; i < rectanglesList.Count; i++){if (bit == null){bit = DrawRectangleInPicture(bitmap, rectanglesList[i], Color.Red, 4, "索引：" + i, 25);}else{Bitmap newBit = new Bitmap(bit);bit.Dispose();bit = DrawRectangleInPicture(newBit, rectanglesList[i], Color.Red, 4, "索引：" + i, 25);}}if (bit == null){Console.WriteLine("bit等于null");return null;}return bit;}/// <summary>/// 图片上画矩形和标记文字/// </summary>/// <param name="bmp">图片bitmap</param>/// <param name="imgRectangle">矩形</param>/// <param name="lineColor">线条的颜色</param>/// <param name="lineWidth">线条</param>/// <param name="text">矩形的文本</param>/// <param name="fontSize">字体大小</param>/// <param name="ds">线条的线型</param>/// <returns></returns>public Bitmap DrawRectangleInPicture(Bitmap bmp, Rectangle imgRectangle, Color lineColor, int lineWidth, string text, int fontSize, DashStyle ds = DashStyle.Solid){if (bmp == null) return null;if (imgRectangle == null) return null;if (lineColor == null) return null;if (lineWidth == 0) return null;if (fontSize == 0) return null;if (string.IsNullOrEmpty(text)) return null;Point pos = imgRectangle.Location;Size size = imgRectangle.Size;Graphics g = Graphics.FromImage(bmp);Brush brush = new SolidBrush(lineColor);Pen pen = new Pen(brush, lineWidth);pen.DashStyle = ds;//画坐标的原点（用于测试）g.DrawEllipse(pen, new Rectangle(pos.X, pos.Y, 15, 15));//画矩形//int rectX = pos.X - (size.Width / 2);//int rectY = pos.Y - (size.Height / 2);//g.DrawRectangle(pen, rectX, rectY, size.Width, size.Height);g.DrawRectangle(pen, pos.X, pos.Y, size.Width, size.Height);Font myFont = new Font("宋体", fontSize, FontStyle.Regular);Brush bush = new SolidBrush(lineColor);//填充的颜色//字体位置的计算SizeF sizeF = g.MeasureString(text, myFont);//int fontPosX = (int)(pos.X - (sizeF.Width / 2));//int fontPosY = (int)(pos.Y + (sizeF.Height / 2) + (size.Height / 2));//g.DrawString(text, myFont, bush, fontPosX, fontPosY);int fontPosX = (int)(pos.X + (size.Width / 2) - (sizeF.Width / 2));int fontPosY = (int)(pos.Y + (size.Height / 2) - (sizeF.Height / 2));g.DrawString(text, myFont, bush, fontPosX, fontPosY);g.Dispose();return bmp;}}
}

三、切图Demo

切图的demo和上面的案例的功能类似

界面

效果

上面gif图片的最后画面

代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;namespace 裁切小图
{public partial class Form1 : Form{public Form1(){InitializeComponent();}string Img1Path = Application.StartupPath + "\\test.jpg";List<PictureBox> PictureBoxesList = new List<PictureBox>();List<Rectangle> PictureCuttingList = new List<Rectangle>();//切割小图的宽度int ImgWidth = 180;private void Form1_Load(object sender, EventArgs e){TextBox_ImaPath.Text = Img1Path;PictureBoxesList.Add(pictureBox1);PictureBoxesList.Add(pictureBox2);PictureBoxesList.Add(pictureBox3);PictureBoxesList.Add(pictureBox4);PictureBoxesList.Add(pictureBox5);}/// <summary>/// 选择图片路径/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Button_SelectImg_Click(object sender, EventArgs e){OpenFileDialog dialog = new OpenFileDialog();dialog.Multiselect = true;//该值确定是否可以选择多个文件dialog.Title = "请选择文件";dialog.Filter = "所有文件(*.*)|*.*";if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK){TextBox_ImaPath.Text = dialog.FileName;Img1Path = dialog.FileName;PictureBox_Template.Image = new Bitmap(Img1Path);}}/// <summary>/// 生成矩形图/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Button_Examine_Click(object sender, EventArgs e){if (!System.IO.File.Exists(Img1Path)){Console.WriteLine("图片路径不存在：" + Img1Path);return;}Bitmap bitmaps = new Bitmap(Img1Path);Random random = new Random();//Console.WriteLine(string.Format("总宽度：{0} 总高度：{1}", Bitmaps.Width, Bitmaps.Height));PictureCuttingList.Clear();for (int i = 0; i < 2; i++){int x = random.Next(10, bitmaps.Width - ImgWidth);int y = random.Next(10, bitmaps.Height - ImgWidth);//这样写矩形会超出图片范围，可以用来测试//int x = random.Next(10, Bitmaps.Width);//int y = random.Next(10, Bitmaps.Height);//Console.WriteLine(string.Format("索引值: {0} x: {1}, y: {2}", i, x, y));PictureCuttingList.Add(new Rectangle(new Point(x, y), new Size(ImgWidth, ImgWidth)));}//给图片画矩形PictureBox_Template.Image = PaintingRectangle(PictureCuttingList, bitmaps);}/// <summary>/// 开始切割/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Button_Cutting_Click(object sender, EventArgs e){if (!System.IO.File.Exists(Img1Path)){Console.WriteLine("图片路径不存在：" + Img1Path);return;}if (PictureCuttingList.Count == 0){Console.WriteLine("PictureCuttingList不能为空");return;}Bitmap bitmaps = new Bitmap(Img1Path);List<Bitmap> cuttingList = CuttingHandle(PictureCuttingList, bitmaps);if (cuttingList != null && cuttingList.Count > 0){for (int i = 0; i < cuttingList.Count; i++){PictureBoxesList[i].Image = cuttingList[i];}}}/// <summary>/// 给图片画矩形/// </summary>/// <param name="rectanglesList"></param>/// <param name="bitmap"></param>public Bitmap PaintingRectangle(List<Rectangle> rectanglesList, Bitmap bitmap){Bitmap bit = null;for (int i = 0; i < rectanglesList.Count; i++){if (bit == null){bit = DrawRectangleInPicture(bitmap, rectanglesList[i], Color.Red, 4, "索引：" + i, 25);}else{Bitmap newBit = new Bitmap(bit);bit.Dispose();bit = DrawRectangleInPicture(newBit, rectanglesList[i], Color.Red, 4, "索引：" + i, 25);}}if (bit == null){Console.WriteLine("bit等于null");return null;}return bit;}/// <summary>/// 裁切图片（切片的坐标以左上角为原点)/// </summary>/// <param name="pictureCuttingList">区域数据列表</param>/// <param name="bitmap">图片bitmap</param>/// <returns>切片的图片列表</returns>public List<Bitmap> CuttingHandle(List<Rectangle> pictureCuttingList, Bitmap bitmap){if (pictureCuttingList == null || pictureCuttingList.Count == 0){Console.WriteLine("[CuttingHandle]pictureCuttingList不能为空");return null;}if (bitmap == null){Console.WriteLine("[CuttingHandle]图片bitmap不能为空");return null;}List<Bitmap> bitmapList = new List<Bitmap>();for (int i = 0; i < pictureCuttingList.Count; i++){Rectangle rectangle = pictureCuttingList[i];if(rectangle == null){Console.WriteLine("[CuttingHandle]pictureCuttingList有值为空，index：" + i);return null;}//判断坐标是否在图片范围内Point pos = rectangle.Location;Size size = rectangle.Size;if(pos.X < 0 || pos.X + size.Width > bitmap.Width){Console.WriteLine("[CuttingHandle]当前区域X轴超出图片范围，索引是：" + i);return null;}if(pos.Y < 0 || pos.Y + size.Height > bitmap.Height){Console.WriteLine("[CuttingHandle]当前区域Y轴超出图片范围，索引是：" + i);return null;}Bitmap cuttingBitmap = bitmap.Clone(rectangle, System.Drawing.Imaging.PixelFormat.DontCare);bitmapList.Add(cuttingBitmap);}if (bitmapList.Count > 0)return bitmapList;return null;}/// <summary>/// 图片上画矩形和标记文字/// </summary>/// <param name="bmp">图片bitmap</param>/// <param name="imgRectangle">矩形</param>/// <param name="lineColor">线条的颜色</param>/// <param name="lineWidth">线条</param>/// <param name="text">矩形的文本</param>/// <param name="fontSize">字体大小</param>/// <param name="ds">线条的线型</param>/// <returns></returns>public Bitmap DrawRectangleInPicture(Bitmap bmp, Rectangle imgRectangle, Color lineColor, int lineWidth, string text, int fontSize, DashStyle ds = DashStyle.Solid){if (bmp == null) return null;if (imgRectangle == null) return null;if (lineColor == null) return null;if (lineWidth == 0) return null;if (fontSize == 0) return null;if (string.IsNullOrEmpty(text)) return null;Point pos = imgRectangle.Location;Size size = imgRectangle.Size;Graphics g = Graphics.FromImage(bmp);Brush brush = new SolidBrush(lineColor);Pen pen = new Pen(brush, lineWidth);pen.DashStyle = ds;//画坐标的原点（用于测试）g.DrawEllipse(pen, new Rectangle(pos.X, pos.Y, 15, 15));//画矩形//int rectX = pos.X - (size.Width / 2);//int rectY = pos.Y - (size.Height / 2);//g.DrawRectangle(pen, rectX, rectY, size.Width, size.Height);g.DrawRectangle(pen, pos.X, pos.Y, size.Width, size.Height);Font myFont = new Font("宋体", fontSize, FontStyle.Regular);Brush bush = new SolidBrush(lineColor);//填充的颜色//字体位置的计算SizeF sizeF = g.MeasureString(text, myFont);//int fontPosX = (int)(pos.X - (sizeF.Width / 2));//int fontPosY = (int)(pos.Y + (sizeF.Height / 2) + (size.Height / 2));//g.DrawString(text, myFont, bush, fontPosX, fontPosY);int fontPosX = (int)(pos.X + (size.Width / 2) - (sizeF.Width / 2));int fontPosY = (int)(pos.Y + (size.Height / 2) - (sizeF.Height / 2));g.DrawString(text, myFont, bush, fontPosX, fontPosY);g.Dispose();return bmp;}}
}

源码地址：点击下载

结束

如果这个帖子对你有用，欢迎关注 + 点赞 + 留言，谢谢

end

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C# Rectangle基本用法和图片切割

一、需求

Rectangle(Point, Size)

Rectangle(Int32, Int32, Int32, Int32)

二、常用的功能

1.判断两个矩形是否相交

2.求出两矩形相交重叠处的矩形

3.案例

三、切图Demo

结束

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