zoukankan html css js c++ java

win32框架,GDI图形编程写一个HelloWorld游戏_c语言

1.如图，实现功能:

Hello World!字符串跟随鼠标移动
鼠标左击Hello World!颜色为红色
鼠标右击Hello World!颜色为蓝色

鼠标滚轮滚动改变Hello World!颜色的RGB中的G值

2.实现工具:

vs2013

3.实现步骤:

　新建一个win32项目

如图,看到HelloWorldGame.cpp中

_tWinMain()的函数是程序入口函数，

WndProc()是处理主窗口的所有消息，

About()是显示关于信息

这样就搭建好了win32框架

接下来开始使用GDI图形编程

　　在WndProc函数中找到case WM_PAINT,在注释中可以看出,WM_PAINT表示绘制消息，我们就是在此

进行绘制操作,我们加入以下代码

TextOut(hdc,0,0,L"Hello World!",12)；

　　参数解释:

hdc 待输出的设备

0 坐标x

0 坐标y

L"Hello World!" L表示将ANSI字符转换为unicode 以便支持中文,Hello World!表示要打印的字符串

12 表示要输出的字符数

F5运行

效果如图

好，接下来我们来添加颜色

在变量声明区域加入以下代码

int r = 125;
int g = 125;
int b = 125;
COLORREF color = RGB(r, g, b);

//定义一个颜色索引color

并在TextOut函数前加入

SetTextColor(hdc, color);//设置文本的颜色

F5运行

如图

好的继续，我们来增加一些互动性,添加更多的消息处理

在WndProc函数中

添加以下代码

case WM_LBUTTONDOWN://鼠标左击消息
color = RGB(255, 0, 0);
break;
case WM_RBUTTONDOWN://鼠标右击消息
color = RGB(0, 0, 255);
break;

F5运行一下看看,哈哈O(∩_∩)O哈！是不是发现没效果！

对！没效果是对的，为什么呢？

因为没有及时发出重新绘制消息

case WM_LBUTTONDOWN://鼠标左击消息
color = RGB(255, 0, 0);
InvalidateRect(hWnd, NULL, TRUE);
break;
case WM_RBUTTONDOWN://鼠标右击消息
color = RGB(0, 0, 255);
InvalidateRect(hWnd, NULL, TRUE);

这样就行了

InvalidateRect参数

hWnd 窗口句柄

NULL 设置矩形

TRUE 设置重画

F5运行

好的，我们实现了鼠标左右击颜色变化

接下来，我们加入鼠标移动消息处理，让Hello World！跟着鼠标移动

首先在声明区声明

WCHAR str[64];
int x = 200, y = 150;

然后在WndProc中加入

case WM_MOUSEMOVE:
x = LOWORD(lParam);//得到x坐标
y = HIWORD(lParam);//得到y坐标
InvalidateRect(hWnd, NULL, TRUE);//发出重绘消息
break;

F5运行

好的，接下来添加鼠标滚轮消息

case WM_MOUSEWHEEL:
//得到鼠标滚轮的参数
int zDelta = (short)HIWORD(wParam);
if (zDelta > 0) //正值向前
{
if (g<255)
g += 1;

}
else //负值向后
{
if (g>0)
g--;
}
color = RGB(0, g, 122);
InvalidateRect(hWnd, NULL, TRUE);
break;

编译运行试试，你发现了什么，haha，编译不同过

因为在case 中定义变量需要用括号把整个部分包含起来才行

case WM_MOUSEWHEEL:
{
//得到鼠标滚轮的参数
int zDelta = (short)HIWORD(wParam);
if (zDelta > 0) //正值向前
{
if (g<255)
g += 1;

}
else //负值向后
{
if (g>0)
g--;
}
color = RGB(0, g, 122);
InvalidateRect(hWnd, NULL, TRUE);
}
break;

我们再添加显示x,y,r,g,b值

定义

int r = 125;
int g = 125;
int b = 125;
COLORREF color = RGB(r, g, b);
WCHAR infor[64];
int x = 200, y = 150;

在case WM_PAINT:中

swprintf_s(infor, L"r:%d,g:%d,b:%d x=%d,y=%d",r,g,b, x, y);//格式化字符串
TextOut(hdc, x, y - 100, infor, wcslen(infor));

F5运行一下

就得到了实现的效果

下面给出 HelloWorldGame.cpp的代码

  1 // HelloWorldGame.cpp : Defines the entry point for the application.
  2 //
  3 
  4 #include "stdafx.h"
  5 #include "HelloWorldGame.h"
  6 
  7 #define MAX_LOADSTRING 100
  8 
  9 // Global Variables:
 10 HINSTANCE hInst;                                // current instance
 11 TCHAR szTitle[MAX_LOADSTRING];                    // The title bar text
 12 TCHAR szWindowClass[MAX_LOADSTRING];            // the main window class name
 13 
 14 //
 15 int r = 125;
 16 int g = 125;
 17 int b = 125;
 18 COLORREF color = RGB(r, g, b);
 19 WCHAR infor[64];
 20 int x = 200, y = 150;
 21 //
 22 // Forward declarations of functions included in this code module:
 23 ATOM                MyRegisterClass(HINSTANCE hInstance);
 24 BOOL                InitInstance(HINSTANCE, int);
 25 LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
 26 INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);
 27 
 28 int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,
 29     _In_opt_ HINSTANCE hPrevInstance,
 30     _In_ LPTSTR    lpCmdLine,
 31     _In_ int       nCmdShow)
 32 {
 33     UNREFERENCED_PARAMETER(hPrevInstance);
 34     UNREFERENCED_PARAMETER(lpCmdLine);
 35 
 36     // TODO: Place code here.
 37     MSG msg;
 38     HACCEL hAccelTable;
 39 
 40     // Initialize global strings
 41     LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
 42     LoadString(hInstance, IDC_HELLOWORLDGAME, szWindowClass, MAX_LOADSTRING);
 43     MyRegisterClass(hInstance);
 44 
 45     // Perform application initialization:
 46     if (!InitInstance(hInstance, nCmdShow))
 47     {
 48         return FALSE;
 49     }
 50 
 51     hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_HELLOWORLDGAME));
 52 
 53     // Main message loop:
 54     while (GetMessage(&msg, NULL, 0, 0))
 55     {
 56         if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
 57         {
 58             TranslateMessage(&msg);
 59             DispatchMessage(&msg);
 60         }
 61     }
 62 
 63     return (int)msg.wParam;
 64 }
 65 
 66 
 67 
 68 //
 69 //  FUNCTION: MyRegisterClass()
 70 //
 71 //  PURPOSE: Registers the window class.
 72 //
 73 ATOM MyRegisterClass(HINSTANCE hInstance)
 74 {
 75     WNDCLASSEX wcex;
 76 
 77     wcex.cbSize = sizeof(WNDCLASSEX);
 78 
 79     wcex.style = CS_HREDRAW | CS_VREDRAW;
 80     wcex.lpfnWndProc = WndProc;
 81     wcex.cbClsExtra = 0;
 82     wcex.cbWndExtra = 0;
 83     wcex.hInstance = hInstance;
 84     wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_HELLOWORLDGAME));
 85     wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
 86     wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
 87     wcex.lpszMenuName = MAKEINTRESOURCE(IDC_HELLOWORLDGAME);
 88     wcex.lpszClassName = szWindowClass;
 89     wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
 90 
 91     return RegisterClassEx(&wcex);
 92 }
 93 
 94 //
 95 //   FUNCTION: InitInstance(HINSTANCE, int)
 96 //
 97 //   PURPOSE: Saves instance handle and creates main window
 98 //
 99 //   COMMENTS:
100 //
101 //        In this function, we save the instance handle in a global variable and
102 //        create and display the main program window.
103 //
104 BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
105 {
106     HWND hWnd;
107 
108     hInst = hInstance; // Store instance handle in our global variable
109 
110     hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
111         CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
112 
113     if (!hWnd)
114     {
115         return FALSE;
116     }
117 
118     ShowWindow(hWnd, nCmdShow);
119     UpdateWindow(hWnd);
120 
121     return TRUE;
122 }
123 
124 //
125 //  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
126 //
127 //  PURPOSE:  Processes messages for the main window.
128 //
129 //  WM_COMMAND    - process the application menu
130 //  WM_PAINT    - Paint the main window
131 //  WM_DESTROY    - post a quit message and return
132 //
133 //
134 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
135 {
136     int wmId, wmEvent;
137     PAINTSTRUCT ps;
138     HDC hdc;
139 
140     switch (message)
141     {
142     case WM_COMMAND:
143         wmId = LOWORD(wParam);
144         wmEvent = HIWORD(wParam);
145         // Parse the menu selections:
146         switch (wmId)
147         {
148         case IDM_ABOUT:
149             DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
150             break;
151         case IDM_EXIT:
152             DestroyWindow(hWnd);
153             break;
154         default:
155             return DefWindowProc(hWnd, message, wParam, lParam);
156         }
157         break;
158     case WM_LBUTTONDOWN://鼠标左击消息
159         color = RGB(255, 0, 0);
160         InvalidateRect(hWnd, NULL, TRUE);
161         break;
162     case WM_RBUTTONDOWN://鼠标右击消息
163         color = RGB(0, 0, 255);
164         InvalidateRect(hWnd, NULL, TRUE);
165         break;
166     case WM_MOUSEMOVE:
167         x = LOWORD(lParam);//得到x坐标
168         y = HIWORD(lParam);//得到y坐标
169         InvalidateRect(hWnd, NULL, TRUE);//发出重绘消息
170         break;
171     case WM_MOUSEWHEEL:
172     {
173         //得到鼠标滚轮的参数
174         int zDelta = (short)HIWORD(wParam);
175         if (zDelta > 0) //正值向前
176         {
177             if (g<255)
178                 g += 1;
179 
180         }
181         else //负值向后
182         {
183             if (g>0)
184                 g--;
185         }
186         color = RGB(0, g, 122);
187         InvalidateRect(hWnd, NULL, TRUE);
188     }
189         break;
190     
191     case WM_PAINT:
192         hdc = BeginPaint(hWnd, &ps);
193         // TODO: Add any drawing code here...
194         SetTextColor(hdc, color);
195         TextOut(hdc, x, y, L"Hello World!", 12);
196         swprintf_s(infor, L"r:%d,g:%d,b:%d
x=%d,y=%d",r,g,b, x, y);//格式化字符串
197         TextOut(hdc, x, y - 100, infor, wcslen(infor));
198         EndPaint(hWnd, &ps);
199         break;
200     case WM_DESTROY:
201         PostQuitMessage(0);
202         break;
203     default:
204         return DefWindowProc(hWnd, message, wParam, lParam);
205     }
206     return 0;
207 }
208 
209 // Message handler for about box.
210 INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
211 {
212     UNREFERENCED_PARAMETER(lParam);
213     switch (message)
214     {
215     case WM_INITDIALOG:
216         return (INT_PTR)TRUE;
217 
218     case WM_COMMAND:
219         if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
220         {
221             EndDialog(hDlg, LOWORD(wParam));
222             return (INT_PTR)TRUE;
223         }
224         break;
225     }
226     return (INT_PTR)FALSE;
227 }

HelloWorldGame.cpp

查看全文

相关阅读:
编译原理-第二章一个简单的语法指导编译器-2.4 语法制导翻译
 编译原理-第二章一个简单的语法指导编译器-2.3 语法定义
 编译原理-第二章一个简单的语法指导编译器-2.2 词法分析
 LeetCode 1347. Minimum Number of Steps to Make Two Strings Anagram
LeetCode 1348. Tweet Counts Per Frequency
1349. Maximum Students Taking Exam（DP，状态压缩）
LeetCode 1345. Jump Game IV(BFS)
LeetCode 212. Word Search II
LeetCode 188. Best Time to Buy and Sell Stock IV (动态规划)
LeetCode 187. Repeated DNA Sequences(位运算，hash)

原文地址：https://www.cnblogs.com/ncgds/p/6288885.html