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使用C#怎么实现一个鼠标裁剪图像功能？针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
具体内容如下
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
{
///
/// 应用程序的主入口点。
///
[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);
}
}
}关于使用C#怎么实现一个鼠标裁剪图像功能问题的解答就分享到这里了，希望以上内容可以对大家有一定的帮助，如果你还有很多疑惑没有解开，可以关注创新互联成都网站设计公司行业资讯频道了解更多相关知识。
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