C#实现图像的鼠标裁剪

怼烎@ 2022-05-16 07:29 206阅读 0赞

C\#的图像裁剪很容易操作,这里给个实现的例子

关键是需要处理鼠标的事件和一些更新

实现鼠标移动的代码.注意更新不要全部重画,只有选择矩形部分重画

C\#的图像裁剪很容易操作,这里给个实现的例子

关键是需要处理鼠标的事件和一些更新

实现鼠标移动的代码.注意更新不要全部重画,只有选择矩形部分重画

private void Form1\_MouseMove(object sender, MouseEventArgs e)  
        \{

if (Track\_move)  
                endpoint = new Point(e.X, e.Y);  
            else  
            \{  
                return;  
            \}  
            rect1 = new Rectangle(stpoint.X, stpoint.Y, endpoint.X - stpoint.X, endpoint.Y - stpoint.Y);

Rectangle tempr = new Rectangle(rect1.X, rect1.Y, rect1.Width + 2, rect1.Height + 2);  
            this.Invalidate(tempr);  
        \}

选择结束的处理代码.

private void Form1\_MouseUp(object sender, MouseEventArgs e)  
        \{  
            if (e.Button == MouseButtons.Left && Track\_move==true )  
            \{  
                Track\_move = false;  
                endpoint = new Point(e.X, e.Y);  
                rect1 = new Rectangle(stpoint.X, stpoint.Y, endpoint.X - stpoint.X, endpoint.Y - stpoint.Y);  
                Rectangle rectorg = new Rectangle(borg.X, borg.Y, image1.Width, image1.Height);  
                if (rect1.Width <= 0)  
                    return;  
                if (rect1.Height <= 0)  
                    return;  
                if (rectorg.Contains(rect1))  
                \{  
                    Rectangle rectadj = new Rectangle(rect1.X - borg.X, rect1.Y - borg.Y, rect1.Width, rect1.Height);  
                    Bitmap cropimge = image1.Clone(rectadj, System.Drawing.Imaging.PixelFormat.Format24bppRgb);  
                    pictureBox2.Image = cropimge;  
                \}  
                else  
                \{  
                    pictureBox2.Image = null;  
                \}  
                this.Invalidate();  
            \}  
        \}

程序的整个代码

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.Runtime.InteropServices;

namespace imageForms  
\{  
    static class Program  
    \{  
        /// <summary>  
        /// 应用程序的主入口点。  
        /// </summary>  
        \[STAThread\]  
        static void Main()  
        \{  
            Application.EnableVisualStyles();  
            Application.SetCompatibleTextRenderingDefault(false);  
            Application.Run(new Form1());  
        \}  
    \}  
    public partial class Form1 : Form  
    \{  
        private System.Windows.Forms.PictureBox pictureBox2;  
        private System.Windows.Forms.Label label1;  
        public Form1()  
        \{  
            InitializeComponent();  
        \}

private void pictureBox1\_Click(object sender, EventArgs e)  
        \{

private void Form1\_Load(object sender, EventArgs e)  
        \{  
            showimg();

\}  
        Bitmap image1;  
        private void showimg()  
        \{  
            int wd = 400;  
            int hg = 200;  
            int len = wd \* hg \* 3;  
            byte\[\] pdata = new byte\[len\];  
            for (int i = 0; i < len; i++)  
            \{  
                if (i > 3 \* wd \* (hg / 2))  
                \{  
                    pdata\[i\] = 255;  
                \}  
                else  
                \{  
                    pdata\[i\] = 0;  
                \}  
            \}

try  
            \{  
                image1 = new Bitmap(wd, hg, System.Drawing.Imaging.PixelFormat.Format24bppRgb);  
                for (int y = 0; y < hg; y++)  
                \{  
                    for (int x = 0; x < wd; x++)  
                    \{  
                        Color crr = Color.FromArgb(pdata\[3 \* wd \* y + x\], pdata\[3 \* wd \* y + x\], pdata\[3 \* wd \* y + x\]);  
                        image1.SetPixel(x, y, crr);  
                    \}  
                \}  
                // Set the PictureBox to display the image.  
              //  pictureBox1.Image = image1;

\}  
            catch (ArgumentException)  
            \{  
                MessageBox.Show("There was an error check data.");  
            \}  
        \}  
        Point stpoint,endpoint;       
        Rectangle rect1;        
        Point borg = new Point(20, 20);  
        protected override void  OnPaint(PaintEventArgs e)  
        \{  
            
            base.OnPaint(e);  
             e.Graphics.DrawImage(image1, borg);  
             if (rect1 != null )  
             \{  
                 e.Graphics.DrawRectangle(new Pen(Color.Red, 1), rect1);  
             \}  
           
        \}

private void Form1\_MouseDown(object sender, MouseEventArgs e)  
        \{  
            if (e.Button == MouseButtons.Left)  
            \{  
                stpoint = new Point(e.X, e.Y);  
                Track\_move = true;  
                return;  
            \}  
            Track\_move = false;  
        \}

Rectangle tempr = new Rectangle(rect1.X, rect1.Y, rect1.Width + 2, rect1.Height + 2);  
            this.Invalidate(tempr);  
        \}  
        private System.ComponentModel.IContainer components = null;

private void InitializeComponent()  
        \{  
            this.pictureBox2 = new System.Windows.Forms.PictureBox();  
            this.label1 = new System.Windows.Forms.Label();  
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox2)).BeginInit();  
            this.SuspendLayout();  
            //   
            // pictureBox2  
            //   
            this.pictureBox2.Location = new System.Drawing.Point(605, 103);  
            this.pictureBox2.Name = "pictureBox2";  
            this.pictureBox2.Size = new System.Drawing.Size(227, 173);  
            this.pictureBox2.TabIndex = 1;  
            this.pictureBox2.TabStop = false;  
            //   
            // label1  
            //   
            this.label1.AutoSize = true;  
            this.label1.Location = new System.Drawing.Point(602, 58);  
            this.label1.Name = "label1";  
            this.label1.Size = new System.Drawing.Size(127, 15);  
            this.label1.TabIndex = 2;  
            this.label1.Text = "鼠标左键选择裁剪";  
            //   
            // Form1  
            //   
            this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 15F);  
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;  
            this.ClientSize = new System.Drawing.Size(844, 558);  
            this.Controls.Add(this.label1);  
            this.Controls.Add(this.pictureBox2);  
            this.Name = "Form1";  
            this.Text = "Form1";  
            this.Load += new System.EventHandler(this.Form1\_Load);  
            this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.Form1\_MouseUp);  
            this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Form1\_MouseDown);  
            this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Form1\_MouseMove);  
            ((System.ComponentModel.ISupportInitialize)(this.pictureBox2)).EndInit();  
            this.ResumeLayout(false);  
            this.PerformLayout();

\}  
        protected override void Dispose(bool disposing)  
        \{  
            if (disposing && (components != null))  
            \{  
                components.Dispose();  
            \}  
            base.Dispose(disposing);  
        \}

\}  
\}