winform图片标尺控件

最近要做个winform的东西，要在里面集成一个类似Windows自带画图的标尺功能，还要能在图片上画矩形框。在网上找了好久也没找到写好的控件，无奈自己做了一个。

目前还有些bug，这里先做个分享。（Ps:很少做winform的东西，做的不好，轻喷。另外欢迎指点。）

由于最后要做的东西的背景是黑的，标尺就画成白的了，有需要的自己改吧。。

直接上代码

 

  1 using Helper;
  2 using System;
  3 using System.Collections.Generic;
  4 using System.Drawing;
  5 using System.Windows.Forms;
  6 
  7 namespace UserCtrl
  8 {
  9     public partial class RulerControl : UserControl
 10     {
 11         private double _monitorDPI = 100;
 12         /// <summary>
 13         /// 用于控制放大倍数
 14         /// </summary>
 15         private double _multiple = 1;
 16 
 17         /// <summary>
 18         /// 每多少个像素1格
 19         /// </summary>
 20         public double MonitorDPI
 21         {
 22             get
 23             {
 24                 return _monitorDPI;
 25             }
 26             set
 27             {
 28                 _monitorDPI = value;
 29             }
 30         }    
 31         /// <summary>
 32         /// X轴偏移位置
 33         /// </summary>
 34         private float offSetX=0;
 35 
 36         /// <summary>
 37         /// Y轴偏移位置
 38         /// </summary>
 39         private float offSetY = 0;
 40 
 41         /// <summary>
 42         /// 开始位置X
 43         /// </summary>
 44         public double XStart
 45         {
 46             get;
 47             set;
 48         }
 49 
 50         /// <summary>
 51         /// 开始位置Y
 52         /// </summary>
 53         public double YStart
 54         {
 55             get;
 56             set;
 57         }
 58 
 59         /// <summary>
 60         /// 用户设置的原始图
 61         /// </summary>
 62         private Image _initImg = null;
 63 
 64 
 65 
 66         /// <summary>
 67         /// 图片
 68         /// </summary>
 69         public Image Image
 70         {
 71             get
 72             {
 73                 return Pic.Image;
 74             }
 75             set
 76             {
 77                 Pic.Image = value;
 78                 if (_initImg == null&&value!=null)
 79                 {
 80                     _initImg = PicHelper.GetNewPic(value, value.Width , value.Height );
 81                 }
 82             }
 83         }
 84         private Font font = new Font("宋体", 9); //刻度值显示字体
 85         public RulerControl()
 86         {
 87             InitializeComponent();
 88         }
 89 
 90         private void Pic_MouseWheel(object sender, MouseEventArgs e)
 91         {
 92             if (MouseButtons == MouseButtons.Left)
 93             {
 94                 return;
 95             }
 96             Image img = Pic.Image;
 97             if (img != null)
 98             {
 99                 if (e.Delta >= 0)
100                 {
101                     if (_multiple * 2 > 4)
102                         return;
103                     _multiple *= 2;
104                 }
105                 else
106                 {
107                     if (Pic.Width < this.Width - 50)
108                         return;
109 
110                     _multiple *= 0.5;
111                     if (Pic.Width <= (this.Width - 50))
112                     {
113                         XStart = 0;
114                         YStart = 0;
115                     }
116                 }
117                 DrawRect();
118                 AdapterDpi();
119                 ReDrawX();
120                 ReDrawY();
121             }
122         }
123 
124         private void RulerControl_Paint(object sender, PaintEventArgs e)
125         {
126             P1.Height = 50;
127             P1.Width = this.Width - 50;
128             P2.Height = this.Height - 50;
129             P2.Width = 50;
130             P1.Location = new Point(50, 0);
131             P2.Location = new Point(0, 50);
132             PContainer.Location = new Point(50, 50);
133         }
134 
135         private void RulerControl_Resize(object sender, EventArgs e)
136         {
137             P1.Height = 50;
138             P1.Width = this.Width - 50;
139             P2.Height = this.Height - 50;
140             P2.Width = 50;
141             P1.Location = new Point(50, 0);
142             P2.Location = new Point(0, 50);
143             PContainer.Location = new Point(50, 50);
144         }
145 
146         /// <summary>
147         /// 重画Y轴
148         /// </summary>
149         private void ReDrawY()
150         {
151             if (P2.BackgroundImage != null)
152             {
153                 P2.BackgroundImage.Dispose();
154             }
155             Bitmap bmpY = new Bitmap(P2.Width, P2.Height);
156             using (Graphics g = Graphics.FromImage(bmpY))
157             {
158                 int originLocation = bmpY.Width - 1;
159                 int startY = (int)Math.Ceiling(YStart);
160                 offSetY = (float)(MonitorDPI * _multiple * (startY - YStart));
161                 for (int i = startY; i <= Math.Ceiling(P2.Height / (MonitorDPI * _multiple) + YStart); i++)
162                 {
163                     float y = (float)(MonitorDPI * _multiple * (i - YStart)) + offSetY;
164                     if (y >= 0)
165                     {
166                         PointF start = new PointF(originLocation, y);
167                         PointF end = new PointF(originLocation - 3, y);
168                         if (i % 5 == 0)
169                         {
170                             end = new PointF(originLocation - 6, y);
171                         }
172                         if (i % 10 == 0 && i != 0)
173                         {
174                             end = new PointF(originLocation - 12, y);
175                             g.DrawString((i*MonitorDPI).ToString(), font, Brushes.White, new PointF(originLocation - 30, y - 5));
176                         }
177                         g.DrawLine(Pens.White, start, end);
178                     }
179                 }
180                 g.DrawLine(Pens.White, new PointF(originLocation, 0), new PointF(originLocation, bmpY.Height));
181                 P2.BackgroundImage = bmpY;
182             }
183         }
184 
185         /// <summary>
186         /// 重画X轴
187         /// </summary>
188         private void ReDrawX()
189         {
190             if (P1.BackgroundImage != null)
191             {
192                 P1.BackgroundImage.Dispose();
193             }
194             Bitmap bmpX = new Bitmap(P1.Width, P1.Height);
195             using (Graphics g = Graphics.FromImage(bmpX))
196             {
197                 int originLocation = bmpX.Height - 1;
198                 int startX = (int)Math.Ceiling(XStart);
199                 offSetX = (float)(MonitorDPI * _multiple * (startX - XStart));
200                 for (int i = startX; i <= Math.Ceiling(P1.Width / (MonitorDPI * _multiple) + XStart); i++)
201                 {
202                     float x = (float)(MonitorDPI * _multiple * (i - XStart)) + offSetX;
203                     if (x >= 0)
204                     {
205                         PointF start = new PointF(x, originLocation);
206                         PointF end = new PointF(x, originLocation - 3);
207                         if (i % 5 == 0)
208                         {
209                             end = new PointF(x, originLocation - 6);
210                         }
211                         if (i % 10 == 0 && i != 0)
212                         {
213                             end = new PointF(x, originLocation - 12);
214                             g.DrawString((i*MonitorDPI).ToString(), font, Brushes.White, new PointF(x - 5, originLocation - 30));
215                         }
216                         g.DrawLine(Pens.White, start, end);
217                     }
218                 }
219                 g.DrawLine(Pens.White, new PointF(0, originLocation), new PointF(bmpX.Width, originLocation));
220                 P1.BackgroundImage = bmpX;
221             }
222         }
223 
224         private void RulerControl_Load(object sender, EventArgs e)
225         {
226             P1.Height = 50;
227             P1.Width = this.Width - 50;
228             P2.Height = this.Height - 50;
229             P2.Width = 50;
230             P1.Location = new Point(50, 0);
231             P2.Location = new Point(0, 50);
232             PContainer.Location = new Point(50, 50);
233             ReDrawX();
234             ReDrawY();
235             Pic.MouseWheel += new MouseEventHandler(Pic_MouseWheel);
236         }
237 
238         private void Pic_MouseEnter(object sender, EventArgs e)
239         {
240             Pic.Focus();
241         }
242 
243         private void PContainer_Scroll(object sender, ScrollEventArgs e)
244         {
245             if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll)
246             {
247                 XStart = e.NewValue / (MonitorDPI * _multiple);
248                 ReDrawX();
249             }
250             else if (e.ScrollOrientation == ScrollOrientation.VerticalScroll)
251             {
252                 YStart = e.NewValue / (MonitorDPI * _multiple);
253                 ReDrawY();
254             }
255         }
256 
257 
258         #region 画图片选定区域
259         bool MouseIsDown = false;
260         Rectangle MouseRect = Rectangle.Empty;
261 
262         private void Pic_MouseDown(object sender, MouseEventArgs e)
263         {
264             MouseIsDown = true;
265             MouseRect = new Rectangle(e.X, e.Y, 0, 0);
266             Rectangle rec = new Rectangle(0, 0,
267                 Math.Min(PContainer.ClientRectangle.Width, Pic.ClientRectangle.Width),
268                 Math.Min(PContainer.ClientRectangle.Height, Pic.ClientRectangle.Height));
269             Cursor.Clip = PContainer.RectangleToScreen(rec);
270         }
271 
272         private void Pic_MouseMove(object sender, MouseEventArgs e)
273         {
274             if (MouseIsDown)
275             {
276                 MouseRect.Width = e.X - MouseRect.Left;
277                 MouseRect.Height = e.Y - MouseRect.Top;
278                 if (MouseRect.Width > 0 && MouseRect.Height > 0)
279                 {
280                     Rectangle rect = Pic.RectangleToScreen(MouseRect);
281                     ControlPaint.DrawReversibleFrame(rect, Color.White, FrameStyle.Dashed);
282                 }
283                 Pic.Refresh();
284             }
285 
286         }
287 
288         private void Pic_MouseUp(object sender, MouseEventArgs e)
289         {
290             if (MouseIsDown)
291             {
292                 MouseRect.Width = e.X - MouseRect.Left;
293                 MouseRect.Height = e.Y - MouseRect.Top;
294                 using (Graphics g = Graphics.FromImage(Pic.Image))
295                 {
296                     g.DrawRectangle(new Pen(Color.Red), MouseRect);
297                 }
298                 Pic.Refresh();
299                 MouseIsDown = false;
300                 if ((int)(MouseRect.Width * _multiple) > 0 && (int)(MouseRect.Height * _multiple) > 0)
301                 {
302                     list.Add(new Rectangle((int)(MouseRect.X / _multiple),
303                         (int)(MouseRect.Y / _multiple),
304                         (int)(MouseRect.Width / _multiple),
305                         (int)(MouseRect.Height / _multiple)
306                         ));
307                 }
308                 MouseRect = Rectangle.Empty;
309                 Cursor.Clip = Rectangle.Empty;
310             }
311         }
312         #endregion
313         public List<Rectangle> list = new List<Rectangle>();
314 
315         private void Pic_DoubleClick(object sender, EventArgs e)
316         {
317             MouseEventArgs ev = e as MouseEventArgs;
318             List<Rectangle> temp = new List<Rectangle>();
319             foreach (Rectangle item in list)
320             {
321                 if (ev.X > item.X * _multiple && ev.X < item.X * _multiple + item.Width * _multiple &&
322                     ev.Y > item.Y * _multiple && ev.Y < item.Y * _multiple + item.Height * _multiple)
323                 {
324                     temp.Add(item);
325                 }
326             }
327             foreach (Rectangle item in temp)
328             {
329                 list.Remove(item);
330             }
331             
332             DrawRect();
333         }
334 
335         /// <summary>
336         /// 把list中的框画到图片中
337         /// </summary>
338         private void DrawRect()
339         {
340             if (Pic.Image != _initImg)
341                 Pic.Image.Dispose();
342             Pic.Image = PicHelper.GetNewPic(_initImg, (int)(_initImg.Width * _multiple), (int)(_initImg.Height * _multiple));
343             using (Graphics g = Graphics.FromImage(Image))
344             {
345                 foreach (Rectangle item in list)
346                 {
347                     g.DrawRectangle(new Pen(Color.Red), new Rectangle((int)(item.X * _multiple),
348                         (int)(item.Y * _multiple),
349                         (int)(item.Width * _multiple),
350                         (int)(item.Height * _multiple)
351                         ));
352                 }
353             }
354             Pic.Refresh();
355         }
356 
357         private void AdapterDpi()
358         {
359             if (MonitorDPI * _multiple < 10)
360             {
361                 MonitorDPI *= 2;
362             }
363             if (MonitorDPI * _multiple > 20)
364             {
365                 MonitorDPI /= 2;
366             }
367         }
368 
369 
370         
371     }
372 }

下载链接：http://download.csdn.net/download/p690075426/10142184