实现图形的重绘.doc

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1、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#include2、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：typedefstructtagDrawLine{POINTptStart;POINTptEnd;}DRAWLINE,*PDRAWLINE;typedefstructta

2、gDrawRect{RECTrect;}DRAWRECT,*PDRAWRECT;typedefenumtagSHAPE{SHAPELINE,SHAPERECT,SHAPEELLIPSE}SHAPE;typedefstructtagDrawShape{SHAPEshape;UINTpenWidth;DWORDcolor;BOOLbFill;union{DRAWLINEShapeLine;DRAWRECTShapeRect;};}DRAWSHAPE,*PDRAWSHAPE;4、修改firstWnd.cpp中DrawStru的定义，增加CArray

3、E,DRAWSHAPE&>graphicArray;这一句，修改后的代码为typedefstructtagDrawStru{enumDrawToolshape;BOOLbMouseDown;BOOLbFill;intxBegin,yBegin,x,y;COLORREFcolor;HPENhPen;HBRUSHhBr;intlineWidth;CArraygraphicArray;}DRAWSTRU,*PDRAWSTRU;5、修改voidLineMouseUp函数在函数的最后增加以下代码DRAWSHAPEmyShape

4、;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voidEllipseMouseUp函数在函

5、数的最后增加以下代码DRAWSHAPEmyShape;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(

6、myShape);7、修改voidRectMouseUp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：HPENhPen,hOldPen;HBRUSHhBr,hOldBr;在//Todo后面增加以下代码inti;DRAWSHAPEmyShape;for(i=0;i

7、Br=CreateSolidBrush(myShape.color);}else{hBr=(HBRUSH)GetStockObject(NULL_BRUSH);}hOldPen=(HPEN)SelectObject(hdc,hPen);hOldBr=(HBRUSH)SelectObject(hdc,hBr);switch(myShape.shape){caseSHAPELINE:MoveToEx(hdc,myShape.ShapeLine.ptStart.x,myShape.ShapeLine.ptStart.y,NULL);LineTo(hdc,myShap

8、e.ShapeLine.ptEnd.x