实现图形的重绘

实现图形的重绘在所给代码的基础上实现图形的重绘（窗口大小改变后所绘制图形不丢失）。1、修改stdafx.h删除 #include 增加#include #include #include 2、修改项目属性将 【配置属性】-【常规】-【MFC的使用】修改为 在共享的DLL中使用MFC3、修改FirstWnd.h增加以下代码：typedef struct tagDrawLinePOINT ptStart;POINT ptEnd;DRAWLINE,*PDRAWLINE;typedef struct tagDrawRectRECT rect;DRAWRECT,*PDRAWRECT;typedef enum tagSHAPESHAPELINE,SHAPERECT,SHAPEELLIPSESHAPE;typedef struct tagDrawShapeSHAPE shape;UINT penWidth;DWORD color;BOOL bFill;unionDRAWLINE ShapeLine;DRAWRECT ShapeRect;DRAWSHAPE,*PDRAWSHAPE;4、修改firstWnd.cpp中 DrawStru的定义，增加CArray graphicArray;这一句，修改后的代码为typedef struct tagDrawStruenum DrawTool shape;BOOL bMouseDown;BOOL bFill;int xBegin,yBegin ,x,y;COLORREF color;HPEN hPen;HBRUSH hBr;int lineWidth;CArray graphicArray; DRAWSTRU ,*PDRAWSTRU;5、修改void LineMouseUp函数在函数的最后增加以下代码DRAWSHAPE myShape;myShape.shape=SHAPELINE;myShape.bFill=dr.bFill;myShape.color=dr.color;myShape.penWidth=1;myShape.ShapeLine.ptStart.x=dr.xBegin;myShape.ShapeLine.ptStart.y=dr.yBegin;myShape.ShapeLine.ptEnd.x=dr.x;myShape.ShapeLine.ptEnd.y=dr.y;dr.graphicArray.Add(myShape);6、修改void EllipseMouseUp函数在函数的最后增加以下代码DRAWSHAPE myShape;myShape.shape=SHAPEELLIPSE;myShape.bFill=dr.bFill;myShape.color=dr.color;myShape.penWidth=1;myShape.ShapeRect.rect.left=dr.xBegin;myShape.ShapeRect.rect.top=dr.yBegin;myShape.ShapeRect.rect.right=dr.x;myShape.ShapeRect.rect.bottom=dr.y;dr.graphicArray.Add(myShape);7、修改void RectMouseUp函数参考6的代码8、修改WM_PAINT处理代码在窗口函数的开始部分增加以下定义：HPEN hPen,hOldPen;HBRUSH hBr,hOldBr;在/Todo后面增加以下代码int i;DRAWSHAPE myShape;for(i=0;idr.graphicArray.GetSize();i+)myShape=dr.graphicArrayi;hPen=CreatePen(PS_SOLID,myShape.penWidth,myShape.color);if(myShape.bFill)hBr=CreateSolidBrush(myShape.color);elsehBr=(HBRUSH)GetStockObject(NULL_BRUSH);hOldPen=(HPEN)SelectObject(hdc,hPen);hOldBr=(HBRUSH)SelectObject(hdc,hBr);switch(myShape.shape)case SHAPELINE:MoveToEx(hdc,myShape.ShapeLine.ptStart.x,myShape.ShapeLine.ptStart.y,NULL);LineTo(hdc,myShape.ShapeLine.ptEnd.x,myShape.ShapeLine.ptEnd.y);break;case SHAPEELLIPSE:Ellipse(hdc,myShape.ShapeRect.rect.left,myShape.ShapeRect.rect.top,myShape.ShapeRect.rect.right,myShape.ShapeRect.rect.bottom);break;case SHAPERECT:Rectangle(hdc,myShape.ShapeRect.rect.left,myShape.ShapeRect.rect.top,myShape.ShapeRect.rect.right,myShape.ShapeRect.rect.bottom);break;SelectObject(hdc,hOldPen);DeleteObject(hPen);if(myShape.bFill)SelectObject(hdc,hOldBr);DeleteObject(hBr);9、在菜单资源中增加菜单项在【File】菜单下增加【打开】菜单 Caption 为打开(&O)，ID为 IDM_FILE_OPEN【保存】菜单 Caption 为保存(&S)，ID为 IDM_FILE_SAVE10、在窗口函数中增加菜单处理代码如下：case IDM_FILE_SAVE:CFile file(TEXT(.g.dat),CFile:modeCreate|CFile:modeWrite);CArchive ar(&file,CArchive:store);dr.graphicArray.Serialize(ar);break;case IDM_FILE_OPEN:CFile file(TEXT(.g.dat),