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1、实验二实验目的：绘制金刚石图案，并利用鼠标交互实现平移、放大和缩小实验过程：设置映射模式为MM_ISOTROPIC，通过在MouseDown、MouseUp及MouseMove消息处理中改变逻辑坐标的原点及范围实现图形的平移及放大和缩小实验主要算法： CAaaaaView:CAaaaaView()/构造函数/ TOD: add construction code hereXw=1000;Yw=1000;x0=y0=0;void CAaaaaView:OnDraw(CDC* pDC)CAaaaaDoc* pDoc = GetDocument();ASSERT_VALID(pDoc);/ TODO
2、: add draw code for native data heredraw(pCurrentDC);/ CAaaaaView printingvoid CAaaaaView:draw(CDC *pDC)CRect Rect;/GetClientRect(& Rect);/pDC-SetMapMode(MM_ISOTROPIC);/设置映射模式/pDC-SetWindowExt(Xw,Yw);/pDC-SetWindowOrg(x0,y0);pDC-SetViewportExt(Rect.right,-Rect.bottom);/pDC-SetViewportOrg(Rect.right/
3、2,Rect.bottom/2);/CBrush d(RGB(0,255,0);/设置填充颜色/pDC-SelectObject(d);/pDC-Ellipse(-200,200,200,-200);int a302;/x坐标为ai0;y坐标为ai1;int r=200; double c=3.141592653; for(int i=0;i=29;i+)ai0=r* cos(2*c/30*i);ai1=r* sin(2*c/30*i);/ofstream d(checkpoint.txt,ios:trunc);/写入记事本，检验是否正确创建各个点/for(int l=0;l30;l+)/da
4、l0 al1endl;/d.close();for(int j=0;j30;j+)for(int k=0;kMoveTo(aj0,aj1);pDC-LineTo(ak0,ak1);void CAaaaaView:OnLButtonDown(UINT nFlags, CPoint point) /缩放下左击放大，平移下平移/ TODO: Add your message handler code here and/or call defaultif(a)Xw=Xw/2;Yw=Yw/2;CPoint p=point;pCurrentDC-DPtoLP(&p);x0=Xw/4+p.x;y0=Yw/4
5、+p.y;elseCPoint b=point;pCurrentDC-DPtoLP(&b);x0=x0-b.x;y0=y0-b.y;Invalidate();CView:OnLButtonDown(nFlags, point);int CAaaaaView:OnCreate(LPCREATESTRUCT lpCreateStruct) if (CView:OnCreate(lpCreateStruct) = -1)return -1;/ TODO: Add your specialized creation code herepCurrentDC= new CClientDC(this);re
6、turn 0;void CAaaaaView:OnRButtonDown(UINT nFlags, CPoint point) /缩放下的右击缩小/ TODO: Add your message handler code here and/or call defaultif(a)Xw=Xw*2;Yw=Yw*2;CPoint p=point;pCurrentDC-DPtoLP(&p);x0=p.x+Xw/4;y0=p.y+Yw/4;Invalidate();CView:OnRButtonDown(nFlags, point);void CAaaaaView:On1() /缩放菜单/ TODO: Add your command handler code herea=true;void CAaaaaView:On2() /平移菜单/ TODO: Add your command handler code herea=false;实验体会： 本次实验让我懂得如何去平移一个物体，也让我懂得如何缩放物体。
