C#实现鼠标裁剪图像功能
本文实例为大家分享了C#实现鼠标裁剪图像的具体代码,供大家参考,具体内容如下
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; } 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(); } } bool Track_move=false ; 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); } 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); } } }
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