版权声明：转载请注明出处。 https://blog.csdn.net/baidu_38304645/article/details/82827028
小球碰壁会回弹。
运行结果：
#include <windows.h>
#pragma comment(lib, "winmm.lib") //调用PlaySound函数所需库文件t
#pragma comment(lib, "Msimg32.lib")
#define WINDOW_WIDTH 800
#define WINDOW_HEIGHT 600
#define WINDOW_TITLE L"【游戏程序设计】匀速直线运动"
HINSTANCE hInst;
HDC hdc, mdc, bufdc;
HBITMAP hbg, hball; //位图句柄，用来存储背景和运动的小球
DWORD g_iNow, g_iPre; //声明两个变量来记录时间，g_tPre记录上一次绘图的时间，g_tNow记录此次准备绘图的时间
RECT rect; //存储客户区所在的矩形
int x, y, vx, vy; //x,y存储小球的位置，vx,vy用来表示速度的x分量和y分量
int MyWindowClass(HINSTANCE);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
void MyDraw(HDC);
/*****************************************************************************************************************
在不同的应用程序中，在此处添加相关的全局变量
******************************************************************************************************************/
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPreInstace,
LPSTR lpCmdLine, int nCmdShow)
{
MyWindowClass(hInstance);
PlaySound(L"sound.wav", NULL, SND_FILENAME| SND_ASYNC| SND_LOOP); //循环播放背景音乐
if(!InitInstance(hInstance, nCmdShow))
return FALSE;
MSG msg = {0};
while(msg.message != WM_QUIT)
{
if(PeekMessage(&msg, 0, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
else
{
g_iNow = GetTickCount();
if(g_iNow - g_iPre >= 40)
{
MyDraw(hdc);
g_iPre = GetTickCount();
}
}
}
return msg.wParam;
}
int MyWindowClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = NULL;
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = L"gamebase";
wcex.hIconSm = NULL;
return RegisterClassEx(&wcex);
}
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hInst = hInstance;
HWND hwnd = CreateWindow(L"gamebase", WINDOW_TITLE, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, WINDOW_WIDTH, WINDOW_HEIGHT, NULL, NULL, hInstance, NULL);
if(!hwnd)
return FALSE;
MoveWindow(hwnd, 10, 10, WINDOW_WIDTH, WINDOW_HEIGHT, true);
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
hdc = GetDC(hwnd);
mdc = CreateCompatibleDC(hdc);
bufdc = CreateCompatibleDC(hdc);
HBITMAP bmp = CreateCompatibleBitmap(hdc, WINDOW_WIDTH, WINDOW_HEIGHT);
SelectObject(mdc, bmp);
hbg = (HBITMAP)LoadImage(NULL, L"bg.bmp", IMAGE_BITMAP, WINDOW_WIDTH, WINDOW_HEIGHT, LR_LOADFROMFILE);
hball = (HBITMAP)LoadImage(NULL, L"ball.bmp", IMAGE_BITMAP, 26, 26, LR_LOADFROMFILE);
//设定小球的初始位置和初始速度分量
x = 50;
y = 50;
vx = 20;
vy = 20;
GetClientRect(hwnd, &rect);
return TRUE;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch(message)
{
case WM_KEYDOWN: //按下键盘消息
switch(wParam) //判断按键的虚拟键码
{
case VK_ESCAPE: //按下【Esc】键
DestroyWindow(hwnd);
break;
}
break;
/**************************************************************************************************************
在退出程序前，往往在此处删除创建的相关资源
***************************************************************************************************************/
case WM_DESTROY:
DeleteObject(hbg);
DeleteObject(hball);
DeleteDC(mdc);
DeleteDC(bufdc);
ReleaseDC(hwnd, hdc);
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, message, wParam, lParam);
}
return 0;
}
/***************************************************************************************************************
在函数MyDraw（）中进行相关绘制工作
****************************************************************************************************************/
void MyDraw(HDC hdc)
{
//绘制背景图片
SelectObject(bufdc, hbg);
BitBlt(mdc, 0, 0, WINDOW_WIDTH, WINDOW_HEIGHT, bufdc, 0, 0, SRCCOPY);
//绘制小球图片
SelectObject(bufdc, hball);
TransparentBlt(mdc, x, y, 26, 26, bufdc, 0, 0, 26, 26, RGB(0,0,0));
//将内存DC内容映射到屏幕上
BitBlt(hdc, 0, 0, WINDOW_WIDTH, WINDOW_HEIGHT, mdc, 0, 0, SRCCOPY);
//计算小球的下一次位置
x += vx;
if(x > rect.right-26)
{
x = rect.right-26;
vx = -vx;
}
else if(x < 0)
{
x = 0;
vx = -vx;
}
y += vy;
if(y > rect.bottom-26)
{
y = rect.bottom-26;
vy = -vy;
}
else if(y < 0)
{
y = 0;
vy = -vy;
}
}