原帖及讨论：http://bbs.bccn.net/thread-216343-1-1.html
本来是学c#的，但是由于喜欢web开发，所以winform学的不是怎么样，对GDI+一直是知道理论也没有什么实践，最近找了点资料，做了点东西，和大家分享分享，有什么地方做的不好，还希望大家指点……
谢谢……
开发工具：visual studio 2005
Form1.cs页面：
| using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace WindowsApplication6 { public partial class Form1 : Form { private Bitmap smallBmp; private Bitmap bmp; //holds original loaded image private Bitmap newbmp; //holds latest version of image private bool imageStatus = false; //indicates image is loaded private int resizeLevel; //level image magnified/reduced private Point lastPoint = Point.Empty;//tracks mouse movement private Point origPoint = Point.Empty;//mouse down coordinates private Rectangle rectSel;//select area private bool selectStatus;//true if area selected public Form1() { InitializeComponent(); panel1.MouseDown+=new MouseEventHandler(panel1_MouseDown); panel1.MouseUp+=new MouseEventHandler(panel1_MouseUp); panel1.MouseMove+=new MouseEventHandler(panel1_MouseMove); panel1.Paint+=new PaintEventHandler(panel1_Paint); } private void Form1_Load(object sender, EventArgs e) { } private void openMenuItem_Click(object sender, EventArgs e) { //load image from file OpenFileDialog fd = new OpenFileDialog(); fd.InitialDirectory = @"D:\My Documents\My Pictures"; fd.Filter = "Image File|*.jpg;*.gif"; if (fd.ShowDialog() == DialogResult.OK) { string fname = fd.FileName; using (Graphics g = panel1.CreateGraphics()) { bmp = new Bitmap(fname); newbmp = bmp; g.FillRectangle(Brushes.White, 0, 0, panel1.Width, panel1.Height); Rectangle r = new Rectangle(0, 0, bmp.Width, bmp.Height); g.DrawImage(bmp, r); imageStatus = true; Graphics gClear = panel2.CreateGraphics(); gClear.FillRectangle(Brushes.White, 0, 0, panel2.Width, panel2.Height); gClear.Dispose(); } } } private void mirrorMenuItem_Click(object sender, EventArgs e) { Graphics g = panel1.CreateGraphics(); int h = newbmp.Height; int w = newbmp.Width; Point[] destPts ={ new Point(w,0), new Point(0,0), new Point(w,h) }; Bitmap tempBmp = new Bitmap(w, h); Graphics gr = Graphics.FromImage(tempBmp); gr.DrawImage(newbmp, destPts); g.DrawImage(tempBmp, 0, 0); newbmp = tempBmp; g.Dispose(); gr.Dispose(); } private void 翻转VToolStripMenuItem_Click(object sender, EventArgs e) { newbmp.RotateFlip(RotateFlipType.RotateNoneFlipY); Graphics g = panel1.CreateGraphics(); g.DrawImage(newbmp, 0, 0); g.Dispose(); } private void 刷屏RToolStripMenuItem_Click(object sender, EventArgs e) { panel1.Invalidate(); panel1.Update(); selectStatus = false; } private void panel1_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; //redraw part of current image to panel if (imageStatus) { g.DrawImage(newbmp, e.ClipRectangle, e.ClipRectangle, GraphicsUnit.Pixel); } base.OnPaint(e); } private void panel1_MouseDown(object sender, MouseEventArgs e) { if (lastPoint != Point.Empty) { panel1.Invalidate(rectSel); panel1.Update(); } lastPoint.X = e.X; lastPoint.Y = e.Y; origPoint = lastPoint; selectStatus = true; } private void panel1_MouseUp(object sender, MouseEventArgs e) { rectSel.X = e.X; if (e.X > origPoint.X) { rectSel.X = origPoint.X; } rectSel.Y = origPoint.Y; rectSel.Width = Math.Abs(e.X - origPoint.X) + 1; rectSel.Height = Math.Abs(e.Y - origPoint.Y) + 1; origPoint = Point.Empty; if (rectSel.Width < 2) { selectStatus = false; } } private void panel1_MouseMove(object sender, MouseEventArgs e) { if (origPoint != Point.Empty) { Rectangle r; Rectangle rd; int xop = origPoint.X; if (xop > lastPoint.X) { xop = lastPoint.X; } int w = Math.Abs(origPoint.X - lastPoint.X) + 1; int h = lastPoint.Y - origPoint.Y + 1; r = new Rectangle(xop, origPoint.Y, w, h); xop = e.X >= origPoint.X ? origPoint.X : e.X; w = Math.Abs(origPoint.X - e.X); h = e.Y - origPoint.Y; rd = new Rectangle(xop, origPoint.Y, w, h); Graphics g = panel1.CreateGraphics(); g.DrawImage(newbmp,r); //newbmp.MakeTransparent(); g.DrawRectangle(Pens.Red, rd); g.Dispose(); lastPoint.X = e.X; lastPoint.Y = e.Y; } } private void 查看cToolStripMenuItem_Click(object sender, EventArgs e) { if (selectStatus) { Graphics g = panel2.CreateGraphics(); g.FillRectangle(Brushes.White, panel2.ClientRectangle); Rectangle rd = new Rectangle(0, 0, rectSel.Width, rectSel.Height); Bitmap temp = new Bitmap(rectSel.Width, rectSel.Height); Graphics gi = Graphics.FromImage(temp); gi.DrawImage(newbmp, rd, rectSel, GraphicsUnit.Pixel); smallBmp = temp; g.DrawImage(smallBmp, rd); g.Dispose(); resizeLevel = 0; } } private void button1_Click(object sender, EventArgs e) { Graphics g = panel2.CreateGraphics(); if (smallBmp != null) { resizeLevel = resizeLevel + 1; float fac = (float)(1.0 + (resizeLevel * .25)); int w = (int)(smallBmp.Width * fac); int h = (int)(smallBmp.Height * fac); Rectangle rd = new Rectangle(0, 0, w, h); Bitmap tempBmp = new Bitmap(w, h); Graphics gi = Graphics.FromImage(tempBmp); gi.DrawImage(smallBmp, rd); g.DrawImage(tempBmp,rd); gi.Dispose(); } g.Dispose(); } private void button2_Click(object sender, EventArgs e) { Graphics g = panel2.CreateGraphics(); if (smallBmp != null) { resizeLevel = (resizeLevel > -3) ? resizeLevel - 1 : resizeLevel; float fac = (float)(1.0 + (resizeLevel * .25)); int w = (int)(smallBmp.Width * fac); int h = (int)(smallBmp.Height * fac); Rectangle rd = new Rectangle(0, 0, w, h); Bitmap tempBmp = new Bitmap(w, h); Graphics gi = Graphics.FromImage(tempBmp); g.FillRectangle(Brushes.White, panel2.ClientRectangle); gi.DrawImage(smallBmp, rd); g.DrawImage(tempBmp, rd); gi.Dispose(); //panel2.Invalidate(); //panel2.Update(); } g.Dispose(); } } } |
Form1.Designer.cs页面
| namespace WindowsApplication6 { partial class Form1 { /// <summary> /// 必需的设计器变量。 /// </summary> private System.ComponentModel.IContainer components = null; /// <summary> /// 清理所有正在使用的资源。 /// </summary> /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param> protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } #region Windows 窗体设计器生成的代码 /// <summary> /// 设计器支持所需的方法 - 不要 /// 使用代码编辑器修改此方法的内容。 /// </summary> private void InitializeComponent() { System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(Form1)); this.menuStrip1 = new System.Windows.Forms.MenuStrip(); this.文件FToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.openMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.图像IToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.mirrorMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.屏幕ＳToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.panel1 = new System.Windows.Forms.Panel(); this.panel2 = new System.Windows.Forms.Panel(); this.button1 = new System.Windows.Forms.Button(); this.button2 = new System.Windows.Forms.Button(); this.翻转VToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.刷屏RToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.查看cToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem(); this.menuStrip1.SuspendLayout(); this.SuspendLayout(); // // menuStrip1 // this.menuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] { this.文件FToolStripMenuItem, this.图像IToolStripMenuItem, this.屏幕ＳToolStripMenuItem}); this.menuStrip1.Location = new System.Drawing.Point(0, 0); this.menuStrip1.Name = "menuStrip1"; this.menuStrip1.Size = new System.Drawing.Size(655, 24); this.menuStrip1.TabIndex = 0; this.menuStrip1.Text = "menuStrip1"; // // 文件FToolStripMenuItem // this.文件FToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] { this.openMenuItem}); this.文件FToolStripMenuItem.Name = "文件FToolStripMenuItem"; this.文件FToolStripMenuItem.Size = new System.Drawing.Size(73, 20); this.文件FToolStripMenuItem.Text = "文件（&F）"; // // openMenuItem // this.openMenuItem.Name = "openMenuItem"; this.openMenuItem.Size = new System.Drawing.Size(114, 22); this.openMenuItem.Text = "打开(&O)"; this.openMenuItem.Click += new System.EventHandler(this.openMenuItem_Click); // // 图像IToolStripMenuItem // this.图像IToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] { this.mirrorMenuItem, this.翻转VToolStripMenuItem, this.查看cToolStripMenuItem}); this.图像IToolStripMenuItem.Name = "图像IToolStripMenuItem"; this.图像IToolStripMenuItem.Size = new System.Drawing.Size(71, 20); this.图像IToolStripMenuItem.Text = "图像（&I）"; // // mirrorMenuItem // this.mirrorMenuItem.Name = "mirrorMenuItem"; this.mirrorMenuItem.Size = new System.Drawing.Size(152, 22); this.mirrorMenuItem.Text = "镜像(&M)"; this.mirrorMenuItem.Click += new System.EventHandler(this.mirrorMenuItem_Click); // // 屏幕ＳToolStripMenuItem // this.屏幕ＳToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] { this.刷屏RToolStripMenuItem}); this.屏幕ＳToolStripMenuItem.Name = "屏幕ＳToolStripMenuItem"; this.屏幕ＳToolStripMenuItem.Size = new System.Drawing.Size(73, 20); this.屏幕ＳToolStripMenuItem.Text = "屏幕（&S）"; // // panel1 // this.panel1.Location = new System.Drawing.Point(12, 27); this.panel1.Name = "panel1"; this.panel1.Size = new System.Drawing.Size(327, 327); this.panel1.TabIndex = 1; // // panel2 // this.panel2.Location = new System.Drawing.Point(364, 27); this.panel2.Name = "panel2"; this.panel2.Size = new System.Drawing.Size(273, 262); this.panel2.TabIndex = 2; // // button1 // this.button1.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(255)))), ((int)(((byte)(224)))), ((int)(((byte)(192))))); this.button1.FlatStyle = System.Windows.Forms.FlatStyle.Flat; this.button1.Font = new System.Drawing.Font("宋体", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134))); this.button1.Location = new System.Drawing.Point(437, 315); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(39, 23); this.button1.TabIndex = 3; this.button1.Text = "+"; this.button1.UseVisualStyleBackColor = false; this.button1.Click += new System.EventHandler(this.button1_Click); // // button2 // this.button2.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(255)))), ((int)(((byte)(224)))), ((int)(((byte)(192))))); this.button2.FlatStyle = System.Windows.Forms.FlatStyle.Flat; this.button2.Font = new System.Drawing.Font("宋体", 15F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(134))); this.button2.Location = new System.Drawing.Point(539, 315); this.button2.Name = "button2"; this.button2.Size = new System.Drawing.Size(39, 23); this.button2.TabIndex = 4; this.button2.Text = "-"; this.button2.UseVisualStyleBackColor = false; this.button2.Click += new System.EventHandler(this.button2_Click); // // 翻转VToolStripMenuItem // this.翻转VToolStripMenuItem.Name = "翻转VToolStripMenuItem"; this.翻转VToolStripMenuItem.Size = new System.Drawing.Size(152, 22); this.翻转VToolStripMenuItem.Text = "翻转(&V)"; this.翻转VToolStripMenuItem.Click += new System.EventHandler(this.翻转VToolStripMenuItem_Click); // // 刷屏RToolStripMenuItem // this.刷屏RToolStripMenuItem.Name = "刷屏RToolStripMenuItem"; this.刷屏RToolStripMenuItem.Size = new System.Drawing.Size(152, 22); this.刷屏RToolStripMenuItem.Text = "刷屏（&R）"; this.刷屏RToolStripMenuItem.Click += new System.EventHandler(this.刷屏RToolStripMenuItem_Click); // // 查看cToolStripMenuItem // this.查看cToolStripMenuItem.Name = "查看cToolStripMenuItem"; this.查看cToolStripMenuItem.Size = new System.Drawing.Size(152, 22); this.查看cToolStripMenuItem.Text = "查看(&c)"; this.查看cToolStripMenuItem.Click += new System.EventHandler(this.查看cToolStripMenuItem_Click); // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(655, 375); this.Controls.Add(this.button2); this.Controls.Add(this.button1); this.Controls.Add(this.panel2); this.Controls.Add(this.panel1); this.Controls.Add(this.menuStrip1); this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon"))); this.MainMenuStrip = this.menuStrip1; this.Name = "Form1"; this.Text = "Form1"; this.Load += new System.EventHandler(this.Form1_Load); this.menuStrip1.ResumeLayout(false); this.menuStrip1.PerformLayout(); this.ResumeLayout(false); this.PerformLayout(); } #endregion private System.Windows.Forms.MenuStrip menuStrip1; private System.Windows.Forms.ToolStripMenuItem 文件FToolStripMenuItem; private System.Windows.Forms.ToolStripMenuItem 图像IToolStripMenuItem; private System.Windows.Forms.ToolStripMenuItem 屏幕ＳToolStripMenuItem; private System.Windows.Forms.ToolStripMenuItem openMenuItem; private System.Windows.Forms.Panel panel1; private System.Windows.Forms.Panel panel2; private System.Windows.Forms.Button button1; private System.Windows.Forms.Button button2; private System.Windows.Forms.ToolStripMenuItem mirrorMenuItem; private System.Windows.Forms.ToolStripMenuItem 翻转VToolStripMenuItem; private System.Windows.Forms.ToolStripMenuItem 刷屏RToolStripMenuItem; private System.Windows.Forms.ToolStripMenuItem 查看cToolStripMenuItem; } } |
Progrem.cs页面
| using System; using System.Collections.Generic; using System.Windows.Forms; namespace WindowsApplication6 { 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()); } } } |
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