这是C++的完整原代码，很好的可以转换成C#代码，用System.2Drawing中的GDI+ Graphics绘图功能画园或是画其它的方式画移动物，
如果移动物是小的pic块，只需要改变pic块的左顶点坐标就可以移动了。计算方法还是那个不变，关键代码部分偶已经解释了。
移动大小是：
rt.left = 0;
rt.top = 0;
rt.right = 50;
rt.bottom = 50;
所以碰边判断需要是左顶点坐标X方向和Y方向各加50，才是方块右下角坐标。
#include <windows.h>
#include <math.h>
/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
/* Make the class name into a global variable */
char szClassName[ ] = "CodeBlocksWindowsApp";
RECT rt;
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nCmdShow)
{
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */
/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default colour as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
"Code::Blocks Template Windows App", /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
/* Make the window visible on the screen */
ShowWindow (hwnd, nCmdShow);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}
/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
/* This function is called by the Windows function DispatchMessage() */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int dirx = 1, diry = 1;
static int speedx = 5, speedy;
static double pi = 3.1415926f;
switch (message) /* handle the messages */
{
case WM_CREATE:
rt.left = 0;
rt.top = 0;
rt.right = 50;
rt.bottom = 50;
SetTimer(hwnd, 1, 10, NULL);
break;
case WM_TIMER:
{
HDC hdc;
RECT r = {0, 0, 535, 350};
speedy = tan(pi / 4) * speedx;
if((rt.left + 50) > 530 || rt.left < 0 ) dirx = -dirx;
if((rt.top + 50) > 350 || rt.top < 0 ) diry = -diry;
rt.left += dirx * speedx;
rt.top += diry * speedy;
hdc = GetDC(hwnd);
//InvalidateRect(hwnd, NULL, FALSE);
FillRect(hdc, &r, (HBRUSH)RGB(0, 0, 0));
Rectangle(hdc, rt.left, rt.top, rt.left + rt.right, rt.top + rt.bottom);
ReleaseDC(hwnd, hdc);
}
break;
case WM_DESTROY:
KillTimer(hwnd, 1);
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}
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