开发学院软件开发VC World space到Page space的转换简介 阅读

World space到Page space的转换简介

 2010-09-04 20:48:25 来源:WEB开发网   
核心提示:三、示例 将图形以原点为中心逆时针旋转,主要代码如下:01void TransformAndDraw(int iTransform,HWND hWnd)?02{03HDC hDC;04XFORM xForm;05RECT rect;06::GetClientRect(hWnd, (LPRECT) &rect);07hD

三、示例 将图形以原点为中心逆时针旋转。

主要代码如下:

01void TransformAndDraw(int iTransform,HWND hWnd)?
02{
03   HDC hDC;
04   XFORM xForm;
05   RECT rect;
06   ::GetClientRect(hWnd, (LPRECT) &rect);
07   hDC = ::GetDC(hWnd);
08   ::MoveToEx(hDC ,rect.right / 2 , 0 , NULL ) ;
09   ::LineTo(hDC , rect.right / 2 , rect.bottom ) ;
10   ::MoveToEx(hDC , 0 , rect.bottom / 2 , NULL ) ;
11   ::LineTo(hDC , rect.right , rect.bottom / 2) ;
12   ::SetGraphicsMode(hDC, GM_ADVANCED);
13   switch (iTransform)
14   {
15   case 0:
16     AfxGetMainWnd()->SetWindowText("原始图像") ;
17       break;
18     case 1:    // Scale to 1/2 of the original size.
19       xForm.eM11 = (FLOAT) 0.5;
20       xForm.eM12 = (FLOAT) 0.0;
21       xForm.eM21 = (FLOAT) 0.0;
22       xForm.eM22 = (FLOAT) 0.5;
23       xForm.eDx = (FLOAT) 0.0;
24       xForm.eDy = (FLOAT) 0.0;
25       ::SetWorldTransform(hDC, &xForm);
26       AfxGetMainWnd()->SetWindowText("缩小到一半") ;
27       break;
28 
29     case 2:  // Translate right by 3/4 inch.
30       xForm.eM11 = (FLOAT) 1.0;
31       xForm.eM12 = (FLOAT) 0.0;
32       xForm.eM21 = (FLOAT) 0.0;
33       xForm.eM22 = (FLOAT) 1.0;
34       xForm.eDx = (FLOAT) 75.0;
35       xForm.eDy = (FLOAT) 0.0;
36       ::SetWorldTransform(hDC, &xForm);
37     AfxGetMainWnd()->SetWindowText("平移") ;
38       break;
39
40     case 3:   // Rotate 30 degrees counterclockwise.
41       xForm.eM11 = (FLOAT) 0.8660;
42       xForm.eM12 = (FLOAT) 0.5000;
43       xForm.eM21 = (FLOAT) -0.5000;
44       xForm.eM22 = (FLOAT) 0.8660;
45       xForm.eDx = (FLOAT) 0.0;
46       xForm.eDy = (FLOAT) 0.0;
47       ::SetWorldTransform(hDC, &xForm);
48     AfxGetMainWnd()->SetWindowText("旋转") ;
49       break;
50
51     case 4:    // Shear along the x-axis with a
52              // proportionality constant of 1.0.
53       xForm.eM11 = (FLOAT) 1.0;
54       xForm.eM12 = (FLOAT) 1.0;
55       xForm.eM21 = (FLOAT) 0.0;
56       xForm.eM22 = (FLOAT) 1.0;
57       xForm.eDx = (FLOAT) 0.0;
58       xForm.eDy = (FLOAT) 0.0;
59       ::SetWorldTransform(hDC, &xForm);
60     AfxGetMainWnd()->SetWindowText("剪切") ;
61       break;
62
63     case 5:   // Reflect about a horizontal axis.
64       xForm.eM11 = (FLOAT) 1.0;
65       xForm.eM12 = (FLOAT) 0.0;
66       xForm.eM21 = (FLOAT) 0.0;
67       xForm.eM22 = (FLOAT) -1.0;
68       xForm.eDx = (FLOAT) 0.0;
69       xForm.eDy = (FLOAT) 0.0;
70       ::SetWorldTransform(hDC, &xForm);
71       AfxGetMainWnd()->SetWindowText("水平镜像") ;
72       break;
73
74   case 6:   // Reflect about a Vertical axis.
75       xForm.eM11 = (FLOAT) -1.0;
76       xForm.eM12 = (FLOAT) 0.0;
77       xForm.eM21 = (FLOAT) 0.0;
78       xForm.eM22 = (FLOAT) 1.0;
79       xForm.eDx = (FLOAT) 0.0;
80       xForm.eDy = (FLOAT) 0.0;
81       ::SetWorldTransform(hDC, &xForm);
82     AfxGetMainWnd()->SetWindowText("垂直镜像") ;
83       break;
84
85   }
86   ::DtoLP(hDC, (LPPOINT) &rect, 2);
87   HBITMAP hBMP1;
88   hBMP1 = ::LoadBitmap(AfxGetResourceHandle() , MAKEINTRESOURCE(IDB_BITMAP1)) ;
89   HDC hImageDC = ::CreateCompatibleDC((HDC)hDC);
90   HBITMAP hOldImageBMP = (HBITMAP)::SelectObject( hImageDC , hBMP1 );
91   ::BitBlt((HDC)hDC,(rect.right/2 -40),(rect.bottom / 2 -40),
         80,80,hImageDC,0,0,SRCCOPY );
92   ::SelectObject((HDC)hDC , hOldImageBMP);
93   ::DeleteObject(hBMP1) ;
94   ::DeleteDC(hImageDC) ;
95   ::ReleaseDC(hWnd, hDC);
96 }

四、结束语

错误之处希望大家批评指正!关于坐标变换的详细信息请参阅msdn中 Coordinate Spaces and Transformations一节。源代码见附件。

本文配套源码

上一页  1 2 

Tags:World space Page

编辑录入:爽爽 [复制链接] [打 印]
[]
  • 好
  • 好的评价 如果觉得好,就请您
      0%(0)
  • 差
  • 差的评价 如果觉得差,就请您
      0%(0)
赞助商链接