c++简单的分形

1 //Copyright (c) LeafCore
2 #include <windows.h>
3 #include <math.h>
4
5 LRESULT CALLBACK WindowProcedure(HWND, UINT, WPARAM, LPARAM);
6 void draw(HDC, double, double, double, double);
7
8 char szClassName[ ] = "LeafCore";
9
10 int WINAPI WinMain(HINSTANCE hThisInstance,
11                    HINSTANCE hPrevInstance,
12                    LPSTR lpszArgument,
13                    int nFunsterStil)
14
15 {
16     HWND hwnd;
17     MSG messages;
18     WNDCLASSEX wincl;
19
20     wincl.hInstance = hThisInstance;
21     wincl.lpszClassName = szClassName;
22     wincl.lpfnWndProc = WindowProcedure;
23     wincl.style = CS_DBLCLKS;
24     wincl.cbSize = sizeof (WNDCLASSEX);
25
26     wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
27     wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
28     wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
29     wincl.lpszMenuName = NULL;
30     wincl.cbClsExtra = 0;
31     wincl.cbWndExtra = 0;
32     wincl.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
33
34     if (!RegisterClassEx(&wincl))
35         return 0;
36
37     hwnd=CreateWindowEx(
38               0,
39               szClassName,
40               "LeafCore",
41               WS_OVERLAPPEDWINDOW,
42               CW_USEDEFAULT,
43               CW_USEDEFAULT,
44               1024,
45               768,
46               HWND_DESKTOP,
47               NULL,
48               hThisInstance,
49               NULL
50          );
51
52     ShowWindow(hwnd, nFunsterStil);
53
54     while(GetMessage(&messages, NULL, 0, 0)) {
55         TranslateMessage(&messages);
56         DispatchMessage(&messages);
57     }
58
59     return messages.wParam;
60 }
61
62 LRESULT CALLBACK WindowProcedure(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
63 {
64     PAINTSTRUCT ps;
65     HDC hdc;
66     switch (message) {
67     case WM_PAINT:
68         hdc=BeginPaint(hwnd, &ps);
69         HPEN green_pen=CreatePen(PS_SOLID, 1, RGB(0, 127, 0));
70         HPEN old_pen=(HPEN) SelectObject(hdc, green_pen);
71
72         draw(hdc, 200, 400, 600, 400);
73
74         SelectObject(hdc, old_pen);
75         DeleteObject(green_pen);
76         EndPaint(hwnd, &ps);
77         break;
78     case WM_DESTROY:
79         PostQuitMessage (0);
80         break;
81     default:
82         return DefWindowProc (hwnd, message, wParam, lParam);
83     }
84
85     return 0;
86 }
87
88 void draw(HDC hdc, double start_x, double start_y, double end_x, double end_y)
89 {
90     if (fabs(start_x-end_x)<2 && fabs(start_y-end_y)<2) {
91         //递归出口
92         return;
93     }
94
95     //左三分点
96     int left_point_x=(int)((2*start_x+end_x)/3);
97     int left_point_y=(int)((2*start_y+end_y)/3);
98
99     //中间点
100     int middle_point_x=(int)((start_x+end_x)/2-0.2887*(start_y-end_y));
101     int middle_point_y=(int)((start_y+end_y)/2+0.2887*(start_x-end_x));
102
103     //右三分点
104     int right_point_x=(int)((start_x+2*end_x)/3);
105     int right_point_y=(int)((start_y+2*end_y)/3);
106
107     //画出起点至左三分点
108     MoveToEx(hdc, (int)start_x, (int)start_y, 0);
109     LineTo(hdc, left_point_x, left_point_y);
110
111     //画出左三分点至中间点
112     draw(hdc, left_point_x, left_point_y, middle_point_x, middle_point_y);
113
114     //画出中间点至右三分点
115     draw(hdc, middle_point_x, middle_point_y, right_point_x, right_point_y);
116
117     //画出右三分点至终点
118     MoveToEx(hdc, right_point_x, right_point_y, 0);
119     LineTo(hdc, (int)end_x, (int)end_y);
120
121     //休眠30毫秒
122     Sleep(30);
123 }

补充：软件开发 , C++ ,