[Winform]截取鼠标附近的图片

[wangchao1982]

标题：[Winform]截取鼠标附近的图片
描述：在一个pictureBox上，获取以鼠标所在位置为中心的图片矩形块（假如正方形的边长为2x).然后现实在另一个图片框里

[格拉]

应该不难吧

[wangchao1982]

关键是我不知道从哪里下手

[格拉]

http://topic.csdn.net/u/20090418/14/2b3125bc-3e9d-473a-b87a-c944a32a820c.html
我发的收集贴，看看或许有帮助

[wzuomin]

Winform窗体放置PictureBox1、PictureBox2两个控件

Public Class Form1

    Private source As Bitmap = Nothing

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        source = New Bitmap(PictureBox1.Width, PictureBox1.Height)
        Dim ofd As New OpenFileDialog With {.Filter = "Image|*.jpg;*.bmp;*.png"}
        If ofd.ShowDialog = Windows.Forms.DialogResult.OK Then
            Using g As Graphics = Graphics.FromImage(source), img As Image = Image.FromFile(ofd.FileName)
                g.DrawImage(img, New Rectangle(0, 0, source.Width, source.Height), New Rectangle(0, 0, img.Width, img.Height), GraphicsUnit.Pixel)
            End Using
            PictureBox1.Image = source
        Else
            Me.Close()
        End If
    End Sub

    Private Sub PictureBox1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseMove
        If source IsNot Nothing Then
            If e.X >= 10 AndAlso e.X <= PictureBox1.Width - 10 Then
                If e.Y >= 10 AndAlso e.Y <= PictureBox1.Height - 10 Then
                    Using g As Graphics = PictureBox2.CreateGraphics
                        g.DrawImage(source, New Rectangle(0, 0, PictureBox2.Width, PictureBox2.Height), New Rectangle(e.X - 10, e.Y - 10, 20, 20), GraphicsUnit.Pixel)
                    End Using
                    Using g As Graphics = PictureBox1.CreateGraphics
                        g.DrawImage(source, 0, 0)
                        g.DrawRectangle(Pens.White, New Rectangle(e.X - 10, e.Y - 10, 20, 20))
                    End Using
                End If
            End If
        End If
    End Sub

End Class

[wzuomin]

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;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        Image source = null;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            source = new Bitmap(PictureBox1.Width, PictureBox1.Height);
            OpenFileDialog ofd = new OpenFileDialog { Filter = "Image|*.jpg;*.bmp;*.png" };
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                using (Graphics g = Graphics.FromImage(source))
                {
                    using (Image img = Image.FromFile(ofd.FileName))
                    {
                        g.DrawImage(img, new Rectangle(0, 0, source.Width, source.Height), new Rectangle(0, 0, img.Width, img.Height), GraphicsUnit.Pixel);
                    }
                }
                PictureBox1.Image = source;
            }
            else
            {
                this.Close();
            } 

        }

        private void PictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (source != null)
            {
                if (e.X >= 10 && e.X <= PictureBox1.Width - 10)
                {
                    if (e.Y >= 10 && e.Y <= PictureBox1.Height - 10)
                    {
                        using (Graphics g = PictureBox2.CreateGraphics())
                        {
                            g.DrawImage(source, new Rectangle(0, 0, PictureBox2.Width, PictureBox2.Height), new Rectangle(e.X - 10, e.Y - 10, 20, 20), GraphicsUnit.Pixel);
                        }
                        using (Graphics g = PictureBox1.CreateGraphics())
                        {
                            g.DrawImage(source, 0, 0);
                            g.DrawRectangle(Pens.White, new Rectangle(e.X - 10, e.Y - 10, 20, 20));
                        }
                    }
                }
            } 

        }
    }
}

[lishuhua19820919]

楼上的我觉得改成，鼠标单击事件就更好了，楼主可以参考楼上代码修改下。

[wzuomin]

呵呵，代码随便改，只要您喜欢