1 /***************************
2 *
3 * 程序名称 ： 模拟正弦波
4 * 作 者 ： doodle777
5 * 版 本 ： 1.1
6 * 日 期 ： 2012-10-19
7 * 说 明 ： 1.1--解决了闪屏问题
8 *
9 ***************************/
10
11 #include<Windows.h>
12 #include<math.h>
13
14 #define NUM 1000
15 #define PI 3.14159
16
17 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM) ;
18 void Draw(HWND,
float,
float) ;
19
20 static int cxClient, cyClient, xOffset, yOffset;
21 POINT apt[NUM] ;
22 static int A =
1000 ;
23 static float w =
20, g =
0 ;
24
25 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine,
int iCmdShow)
26 {
27 static TCHAR szAppName[] = TEXT(
"模拟正弦波") ;
28 HWND hwnd ;
29 MSG msg ;
30 WNDCLASS wndclass ;
31
32 wndclass.cbClsExtra =
NULL ;
33 wndclass.cbWndExtra =
NULL ;
34 wndclass.hbrBackground =
(HBRUSH)GetStockObject(WHITE_BRUSH) ;
35 wndclass.hCursor =
LoadCursor(NULL, IDC_ARROW) ;
36 wndclass.hIcon =
LoadIcon(NULL, IDI_APPLICATION) ;
37 wndclass.hInstance =
hInstance ;
38 wndclass.lpfnWndProc =
WndProc ;
39 wndclass.lpszClassName =
szAppName ;
40 wndclass.lpszMenuName =
NULL ;
41 wndclass.style = CS_HREDRAW |
CS_VREDRAW ;
42
43 if(!RegisterClass(&
wndclass))
44 {
45 MessageBox(NULL, TEXT(
"This Program Requires Windows NT !"), szAppName, MB_ICONERROR) ;
46 return 0 ;
47 }
48
49 hwnd = CreateWindow(szAppName, TEXT(
"模拟正弦波(上下左右控制)"), WS_OVERLAPPEDWINDOW,
50 CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,CW_USEDEFAULT,
51 NULL, NULL, hInstance, NULL) ;
52 ShowWindow(hwnd, iCmdShow) ;
53 UpdateWindow(hwnd) ;
54
55 while(TRUE)
56 {
57 if(PeekMessage(&msg, NULL,
0,
0, PM_REMOVE))
58 {
59 if(msg.message ==
WM_QUIT)
60 break ;
61 TranslateMessage(&
msg) ;
62 DispatchMessage(&
msg) ;
63 }
64 else
65 {
66 Draw(hwnd, w, g) ;
67 // w += 1 ;
68 // g += PI / 6 ;
69
70 }
71 }
72 return msg.wParam ;
73 }
74
75 LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
76 {
77 RECT rect ;
78
79 rect.bottom =
cyClient ;
80 rect.left =
0 ;
81 rect.right =
cxClient ;
82 rect.top =
0 ;
83
84 switch(message)
85 {
86 case WM_SIZE :
87 cxClient =
LOWORD(lParam) ;
88 cyClient =
HIWORD(lParam) ;
89 xOffset = cxClient /
2 ;
90 yOffset = cyClient /
2 ;
91 A = cyClient /
2 ;
92
93 return 0 ;
94
95 case WM_KEYDOWN :
96 InvalidateRect(hwnd, &
rect, TRUE) ;
97 switch(wParam)
98 {
99 case VK_UP :
100 g += PI /
6 ;
101 break ;
102 case VK_DOWN :
103 g -= PI /
6 ;
104 break ;
105 case VK_LEFT :
106 w -=
1 ;
107 break ;
108 case VK_RIGHT :
109 w +=
1 ;
110 break ;
111 }
112 return 0 ;
113
114
115 case WM_DESTROY :
116 PostQuitMessage(
0) ;
117 return 0 ;
118 }
119 return DefWindowProc(hwnd, message, wParam, lParam) ;
120 }
121
122 void Draw(HWND hwnd,
float w,
float g)
123 {
124 HDC hdc ;
125 PAINTSTRUCT ps ;
126 int t ;
127
128 hdc =
GetDC(hwnd) ;
129
130 MoveToEx(hdc,
0, yOffset, NULL) ;
131 LineTo(hdc, cxClient, yOffset) ;
132 MoveToEx(hdc, xOffset,
0, NULL) ;
133 LineTo(hdc, xOffset, cyClient) ;
134
135 apt[
0].x =
0 ;
136 apt[
0].y = yOffset + A *
sin(g) ;
137 MoveToEx(hdc, apt[
0].x, apt[
0].y, NULL) ;
138 for(t =
1; t < NUM ; t++
)
139 {
140 apt[t].x = cxClient * t /
NUM ;
141 apt[t].y = yOffset + A * sin(w * t / NUM +
g ) ;
142 LineTo(hdc, apt[t].x, apt[t].y) ;
143 MoveToEx(hdc, apt[t].x, apt[t].y, NULL) ;
144 }
145
146 ReleaseDC(hwnd, hdc) ;
147 }
转载于:https://www.cnblogs.com/doodle777/p/3160478.html
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