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 //遞歸出口
92 return;
93 }
94
95 //左三分點
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 //中間點
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 //右三分點
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 //畫出起點至左三分點
108 MoveToEx(hdc, (int)start_x, (int)start_y, 0);
109 LineTo(hdc, left_point_x, left_point_y);
110
111 //畫出左三分點至中間點
112 draw(hdc, left_point_x, left_point_y, middle_point_x, middle_point_y);
113
114 //畫出中間點至右三分點
115 draw(hdc, middle_point_x, middle_point_y, right_point_x, right_point_y);
116
117 //畫出右三分點至終點
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 }
