一个非常好用的图片切割工具（c# winform开发）

本人业余时间开发了一个图片切割工具，非常好用，也很灵活！

特别对大型图片切割，更能体现出该软件的优势！

功能说明

可以设定切割的高度和宽度。切割线可以上下拖动，可以增加一个切割区域，可设定某个区域不参与切割。

主要技术点分析

切割区域确定

每个切割区域是一个长方形。用一个结构标识该属性。

 class SpliteMoveIndex
     {
         public enum EN_DIR
         {
             NON,
             HORIZONTAL,
             VERTICAL
         };
         public EN_DIR direct = EN_DIR.NON;//0 无；1 水平；2垂直
         public int rectIndex; //第几个rect
         public int lineIndex; //第几个线 1:上或左；2 下或右
         public int mouseX;
         public int mouseY;

         public static SpliteMoveIndex CreateNon(int x, int y)
         {
             SpliteMoveIndex _nonIndex = new SpliteMoveIndex();
             _nonIndex.direct = EN_DIR.NON;
             _nonIndex.SetMouse(x, y);
             return _nonIndex;
         }

         public SpliteMoveIndex()
         {

         }
         public SpliteMoveIndex(int x, int y)
         {
             SetMouse(x, y);
         }

         public bool IsSameLine(SpliteMoveIndex another)
         {
             return this.direct == another.direct
                 && this.rectIndex == another.rectIndex
                 && this.lineIndex == another.lineIndex;
         }

         public bool IsIn()
         {
             return direct != EN_DIR.NON;
         }
         public bool IsHorIn()
         {
             return direct == EN_DIR.HORIZONTAL;
         }
         public bool IsVertIn()
         {
             return direct == EN_DIR.VERTICAL;
         }

         public void SetMouse(int x, int y)
         {
             mouseX = x;
             mouseY = y;
         }
     }

SpliteRectGroup 负责组合这些长方形。当有鼠标移动时，动态调整这些长方形大小，再重画！

  class SpliteRectGroup
     {
         List<Rectangle> _listSplitRect = new List<Rectangle>();
         int _widthSrc;
         int _heightSrc;

         SpliteMoveIndex _lastMoveIndex = new SpliteMoveIndex();

         public int _defaultHitSpace = ;

         int _moveAllFlagR = ;
         bool _isMoveAll = false;

         //不参加切割的区域
         List<int> _listSplitRectNotUsed = new List<int>();

         public void SetRect(int widthSrc, int heightSrc, int startX, int startY,
             int widthDest, int heightDest)
         {
             _widthSrc = widthSrc;
             _heightSrc = heightSrc;
             _listSplitRect.Clear();

             GetSplitSize(_widthSrc, _heightSrc, startX, startY,
            widthDest, heightDest, ref _listSplitRect);
         }

         public List<Rectangle> GetRects()
         {
             return _listSplitRect;
         }

         public List<Rectangle> GetRectsSplit()
         {
             List<Rectangle> listShow = new List<Rectangle>();

             int i = ;
             foreach(Rectangle rect in _listSplitRect)
             {
                 if(IsRectUsed(i))
                 {
                     listShow.Add(rect);
                 }
                 i++;
             }
             return listShow;
         }

         public int GetStartX()
         {
             if (_listSplitRect.Count == )
                 return ;
             Rectangle first = _listSplitRect.First();
             return first.X;
         }

         public int GetSpliteWidth()
         {
             if (_listSplitRect.Count == )
                 return ;
             Rectangle first = _listSplitRect.First();
             return first.Width;
         }

         public int GetSpliteTotalHeight()
         {
             if (_listSplitRect.Count == )
                 return ;
             int i = ;
             foreach (Rectangle r in _listSplitRect)
             {
                 i += r.Height;
             }
             return i;
         }

         public void SetMoveAllFlag(bool flag)
         {
             _isMoveAll = flag;
         }

         public bool GetMoveAllFlag()
         {
             return _isMoveAll;
         }

         public int GetStartY()
         {
             if (_listSplitRect.Count == )
                 return ;
             Rectangle first = _listSplitRect.First();
             return first.Y;
         }
         public void Draw(Graphics g)
         {
             SolidBrush brushRect = new SolidBrush(Color.FromArgb(, , , ));
             Font strfont = new Font("Verdana", );
             Brush strBrush = Brushes.Blue;
             Brush strBrushBack = Brushes.White;

             //起点圆
             int x = GetStartX();
             int y = GetStartY();
             g.FillEllipse(brushRect, x - _moveAllFlagR, y - _moveAllFlagR,  * _moveAllFlagR,  * _moveAllFlagR);
             brushRect.Dispose();
             //起点信息
             string startInfo = string.Format("({0}:{1})",x,y);
             SizeF sizeF = g.MeasureString(startInfo, strfont);
             Point ptStart = new Point((int)(x-sizeF.Width/), (int)(y -sizeF.Height- _defaultHitSpace*) );
             g.FillRectangle(strBrushBack, new RectangleF(ptStart, sizeF));
             g.DrawString(startInfo, strfont, strBrush, ptStart);

             //画方框
             Color backColor = Color.FromArgb(, Color.PowderBlue);
             HatchBrush hat1 = new HatchBrush(HatchStyle.OutlinedDiamond, Color.DarkBlue, backColor);
             HatchBrush hat2 = new HatchBrush(HatchStyle.OutlinedDiamond, Color.Red, backColor);

             //输出提示信息
             Pen rectPen = Pens.Red;
             int i = ;
             int showIndex = ;
             string info;
             foreach (Rectangle rect in _listSplitRect)
             {
                 i++;
                 bool used = IsRectUsed(rect);
                 if (used)
                 {
                     showIndex++;
                     info = string.Format("{0}-({1}:{2})", showIndex, rect.Width, rect.Height);
                 }
                 else
                 {
                     info = string.Format("({0}:{1})--不参与切割",  rect.Width, rect.Height);
                 }

                 g.DrawRectangle(rectPen, rect);
                 if (!used)
                 {
                     g.FillRectangle(hat1, rect);
                 }

                 Point strStart = new Point(rect.X + , rect.Y + );
                 sizeF = g.MeasureString(info, strfont);
                 g.FillRectangle(strBrushBack, new RectangleF(strStart, sizeF));

                 g.DrawString(info, strfont, strBrush, strStart);
             }
             strfont.Dispose();
             hat1.Dispose();
             hat2.Dispose();
         }
         public bool StartPointMoveTo(int x, int y)
         {
             if (_listSplitRect.Count == )
                 return false;

             Rectangle first = _listSplitRect.First();
             int moveX = x - first.X;
             int moveY = y - first.Y;

             List<Rectangle> listSplitRectNew = new List<Rectangle>();
             foreach (Rectangle r in _listSplitRect)
             {
                 Rectangle tmp = r;
                 tmp.Offset(moveX, moveY);
                 listSplitRectNew.Add(tmp);
             }

             _listSplitRect.Clear();
             _listSplitRect = listSplitRectNew;
             return true;
         }

         public bool IsAllMove(int mouseX, int mouseY)
         {
             GraphicsPath myGraphicsPath = new GraphicsPath();
             myGraphicsPath.Reset();
             Region myRegion = new Region();

             int x = GetStartX();
             int y = GetStartY();
             myGraphicsPath.AddEllipse(x - _moveAllFlagR, y - _moveAllFlagR,  * _moveAllFlagR,  * _moveAllFlagR);//points);
             myRegion.MakeEmpty();
             myRegion.Union(myGraphicsPath);
             //返回判断点是否在多边形里
             bool myPoint = myRegion.IsVisible(mouseX, mouseY);
             return myPoint;
         }

         public void ResetMoveFlag()
         {
             _lastMoveIndex.direct = SpliteMoveIndex.EN_DIR.NON;
         }

         public bool SetMove(SpliteMoveIndex index)
         {
             //移动到区域外
             if (!index.IsIn())
             {
                 _lastMoveIndex = index;
                 return false;
             }

             //不是同一条线
             if (!_lastMoveIndex.IsSameLine(index))
             {
                 _lastMoveIndex = index;
                 return false;
             }

             //移动到新的区域
             MoveRect(_lastMoveIndex, index);
             _lastMoveIndex = index;
             return true;
         }

         public bool IsInSplite()
         {
             if (_lastMoveIndex == null)
                 return false;
             return _lastMoveIndex.IsIn();
         }

         void MoveRect(SpliteMoveIndex last, SpliteMoveIndex now)
         {
             if (last.IsHorIn())
             {
                 MoveRectHor(last, now);
             }
             else if (last.IsVertIn())
             {
                 MoveRectVert(last, now);
             }
         }

         void MoveRectHor(SpliteMoveIndex last, SpliteMoveIndex now)
         {
             int moveY = now.mouseY - last.mouseY;
             List<Rectangle> listSplitRectNew = new List<Rectangle>();
             int i = ;
             int find = ;
             foreach (Rectangle r in _listSplitRect)
             {
                 Rectangle tmp = r;
                 i++;
                 if (find == )
                 {
                     listSplitRectNew.Add(tmp);
                     continue;
                 }
                 if (find == )
                 {
                     tmp.Y += moveY;
                     tmp.Height -= moveY;
                     find = ;
                     listSplitRectNew.Add(tmp);
                     continue;
                 }

                 if (i == last.rectIndex)
                 {
                     if (last.lineIndex == )
                     {
                         tmp.Y += moveY;
                         tmp.Height -= moveY;
                         find = ;
                         listSplitRectNew.Add(tmp);
                     }
                     else if (last.lineIndex == )
                     {
                         tmp.Height += moveY;
                         find = ;
                         listSplitRectNew.Add(tmp);
                     }
                 }
                 else
                 {
                     listSplitRectNew.Add(tmp);
                 }
             }

             _listSplitRect.Clear();
             _listSplitRect = listSplitRectNew;
         }

         void MoveRectVert(SpliteMoveIndex last, SpliteMoveIndex now)
         {
             int moveX = now.mouseX - last.mouseX;
             List<Rectangle> listSplitRectNew = new List<Rectangle>();
             int i = ;
             foreach (Rectangle r in _listSplitRect)
             {
                 Rectangle tmp = r;
                 i++;
                 if (last.lineIndex == )
                 {
                     tmp.X += moveX;
                     tmp.Width -= moveX;
                     listSplitRectNew.Add(tmp);
                 }
                 else if (last.lineIndex == )
                 {
                     tmp.Width += moveX;
                     listSplitRectNew.Add(tmp);
                 }
             }

             _listSplitRect.Clear();
             _listSplitRect = listSplitRectNew;
         }

         SpliteMoveIndex GetHorizontal(int x, int y, int hitSpace)
         {
             int startX = GetStartX();
             int width = GetSpliteWidth();
             if (x < startX || x > (startX + width))
                 return SpliteMoveIndex.CreateNon(x, y);

             int i = ;
             foreach (Rectangle rect in _listSplitRect)
             {
                 i++;
                 int y1 = rect.Y;
                 //是否落在水平线 一定范围内
                 if (y >= y1 - hitSpace && y <= (y1 + hitSpace))
                 {
                     SpliteMoveIndex moveIndex = new SpliteMoveIndex(x, y);
                     moveIndex.direct = SpliteMoveIndex.EN_DIR.HORIZONTAL;
                     moveIndex.rectIndex = i;
                     moveIndex.lineIndex = ;
                     return moveIndex;
                 }

                 int y2 = rect.Y + rect.Height;
                 if (y >= (y2 - hitSpace) && y <= (y2 + hitSpace))
                 {
                     SpliteMoveIndex moveIndex = new SpliteMoveIndex(x, y);
                     moveIndex.direct = SpliteMoveIndex.EN_DIR.HORIZONTAL;
                     moveIndex.rectIndex = i;
                     moveIndex.lineIndex = ;
                     return moveIndex;
                 }
             }

             return SpliteMoveIndex.CreateNon(x, y);
         }

         SpliteMoveIndex GetVectical(int x, int y, int hitSpace)
         {
             int startY = GetStartY();
             if (y < startY || y > (startY + _heightSrc))
                 return SpliteMoveIndex.CreateNon(x, y);

             int i = ;
             foreach (Rectangle rect in _listSplitRect)
             {
                 i++;
                 //是否落在垂直线 一定范围内
                 if (y >= rect.Y && y <= (rect.Y + rect.Height))
                 {
                     int x1 = rect.X;
                     if (x >= (x1 - hitSpace) && x <= (x1 + hitSpace))
                     {
                         SpliteMoveIndex moveIndex = new SpliteMoveIndex(x, y);
                         moveIndex.direct = SpliteMoveIndex.EN_DIR.VERTICAL;
                         moveIndex.rectIndex = i;
                         moveIndex.lineIndex = ;
                         return moveIndex;
                     }

                     int x2 = rect.X + rect.Width;
                     if (x >= (x2 - hitSpace) && x <= (x2 + hitSpace))
                     {
                         SpliteMoveIndex moveIndex = new SpliteMoveIndex(x, y);
                         moveIndex.direct = SpliteMoveIndex.EN_DIR.VERTICAL;
                         moveIndex.rectIndex = i;
                         moveIndex.lineIndex = ;
                         return moveIndex;
                     }
                 }
             }

             return SpliteMoveIndex.CreateNon(x, y);
         }

         public SpliteMoveIndex PointHit(int x, int y, int hitSpace)
         {
             //判断是否在水平线
             SpliteMoveIndex hRect = GetHorizontal(x, y, hitSpace);
             if (hRect.IsIn())
                 return hRect;

             //判断是否在垂直线
             SpliteMoveIndex vRect = GetVectical(x, y, hitSpace);
             if (vRect.IsIn())
                 return vRect;

             return SpliteMoveIndex.CreateNon(x, y);
         }

         public bool PointInRect(int x,int y)
         {
             int startX = GetStartX();
             int width = GetSpliteWidth();
             if (x < startX || x > (startX + width))
                 return false;

             int startY = GetStartY();
             int heght = GetSpliteTotalHeight();
             if (y < startY || y > (startY + heght))
                 return false;
             return true;
         }

         public void ClearNotUsedRect()
         {
             _listSplitRectNotUsed.Clear();
         }

         public bool GetRectIndex(int index,ref Rectangle outRect)
         {
             int i = ;
             foreach (Rectangle rect in _listSplitRect)
             {
                 if (i == index)
                 {
                     outRect = rect;
                     return true;
                 }
                 i++;
             }
             return false;
         }

         public bool IsNotUsed(int x, int y)
         {
             Rectangle rect = new Rectangle();
             foreach (int n in _listSplitRectNotUsed)
             {
                 if (GetRectIndex(n, ref rect) && rect.Contains(x, y))
                 {
                     return true;
                 }
             }
             return false;
         }

         public bool IsRectUsed(Rectangle rect)
         {
             Rectangle rectNot = new Rectangle();
             foreach (int n in _listSplitRectNotUsed)
             {
                 if (GetRectIndex(n, ref rectNot) && rectNot == rect)
                 {
                     return false;
                 }
             }
             return true;
         }

         public bool IsRectUsed(int index)
         {
             foreach (int n in _listSplitRectNotUsed)
             {
                 if (n == index)
                     return false;
             }
             return true;
         }

         //区块加入切割
         public bool AddRectUsed(int x,int y)
         {
             int i = ;
             Rectangle rectNot = new Rectangle();
             foreach (int n in _listSplitRectNotUsed)
             {
                 if (GetRectIndex(n, ref rectNot) && rectNot.Contains(x,y))
                 {
                     _listSplitRectNotUsed.RemoveAt(i);
                     return true;
                 }
                 i++;
             }
             return false;
         }

         //区块不加入切割
         public bool DelRectUsed(int x, int y)
         {
             int i = ;
             foreach (Rectangle rect in _listSplitRect)
             {
                 if (rect.Contains(x, y))
                 {
                     _listSplitRectNotUsed.Add(i);
                     return true;
                 }
                 i++;
             }
             return false;
         }

         public bool AddHorLine(int x, int y)
         {
             List<Rectangle> listSplitRectNew = new List<Rectangle>();
             foreach (Rectangle rect in _listSplitRect)
             {
                 if (y > rect.Y && y < rect.Y + rect.Height)
                 {
                     Rectangle r1 = new Rectangle(rect.Location, rect.Size);
                     r1.Height = y - rect.Y;
                     listSplitRectNew.Add(r1);

                     r1.Y = y ;
                     r1.Height = (rect.Y + rect.Height - y);
                     listSplitRectNew.Add(r1);
                 }
                 else
                 {
                     listSplitRectNew.Add(rect);
                 }
             }
             _listSplitRect = listSplitRectNew;
             return true;
         }

         //删除水平线
         public bool DeleteHorSplite(SpliteMoveIndex index)
         {
             List<Rectangle> listSplitRectNew = new List<Rectangle>();
             int i = ;
             bool del = false;
             Rectangle lastRect = new Rectangle();
             bool haveLast = false;

             foreach (Rectangle rect in _listSplitRect)
             {
                 i++;
                 if(haveLast)
                 {
                     haveLast = false;
                     lastRect.Height += rect.Height;
                     listSplitRectNew.Add(lastRect);
                     continue;
                 }

                 if(index.rectIndex == i)
                 {
                     del = true;
                     if (index.lineIndex == )
                     {
                         if(listSplitRectNew.Count == )
                         {
                             continue;
                         }
                         else
                         {
                             Rectangle r = listSplitRectNew.Last();
                             r.Height += rect.Height;
                             listSplitRectNew.RemoveAt(listSplitRectNew.Count-);
                             listSplitRectNew.Add(r);
                         }
                     }
                     else if (index.lineIndex == )
                     {
                         if(i == _listSplitRect.Count)
                         {
                             continue;
                         }
                         else
                         {
                             lastRect = rect;
                             haveLast = true;
                         }
                     }
                     else { Debug.Assert(false); }
                 }
                 else
                 {
                     listSplitRectNew.Add(rect);
                 }
             }

             _listSplitRect = listSplitRectNew;
             return del;
         }

         public static int GetSplitSize(int widthSrc, int heightSrc, int startX, int startY,
             int widthDest, int heightDest, ref List<Rectangle> listOut)
         {
             listOut = new List<Rectangle>();

             int width = Math.Min(widthSrc - startX, widthDest);

             int i = ;
             bool stop = false;
             while (!stop)
             {
                 Rectangle rect = new Rectangle();

                 rect.X = startX;
                 rect.Y = startY + (i * heightDest);
                 rect.Width = width;
                 rect.Height = heightDest;
                 if (rect.Y + rect.Height >= heightSrc)
                 {
                     stop = true;
                     rect.Height = heightSrc - rect.Y;
                 }
                 listOut.Add(rect);
                 i++;
             }
             return ;
         }
     }

图像快速切割

图像切割其实就是在一个内存中重新绘制，再将内存中的数据保存到文件。切割代码如下：

 。。。

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