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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
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.
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
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); } }} |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/s8848/article/details/46286513
