Question

关于用VS2005 C/C++画点的问题

如何用VS2005画点，本人不会MFC,只懂纯写代码，目前新东西来不及学了，所以讲的越简单越好，最主要现在上课学计算机图形学要做练习，所以关键在看看效果对不对。

请高手写一段代码，实现画一个看得见的点
要黏贴上去直接就能通过编译的，OK？什么头文件的都要

Thanks

Answer 1

/* 如果能看懂，自己写好再调试，挺基础的 */
#include <windows.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

typedef struct STNodeType
{
WORD x;
WORD y;
struct STNodeType *next;
} NodeType;

NodeType *poly_head;

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
int WINAPI WinMain
(
HINSTANCE hInstance,HINSTANCE hPrevInst,LPSTR lpszCmdLine,int nCmdShow)

{
HWND hwnd;
MSG Msg;
WNDCLASS wndclass;
char lpszClassName[] = "basic";
char lpszTitle[]= "Drawing";
wndclass.style = 0;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon( NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor( NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = lpszClassName ;

if( !RegisterClass( &wndclass))
{
MessageBeep(0) ;
return FALSE ;
}

hwnd = CreateWindow(
lpszClassName,
lpszTitle,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);

// init poly list
poly_head = (NodeType *)malloc(sizeof(NodeType));
if (NULL == poly_head) return Msg.wParam;
poly_head->x = poly_head->y = 0;
poly_head->next = NULL;

ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);

while( GetMessage(&Msg, NULL, 0, 0))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}

return Msg.wParam;
}

void BeforeRelease(HDC hdc)
{
HBRUSH hB;
NodeType *pNTA = NULL;
if (NULL == poly_head || NULL == poly_head->next)
return;

SetMapMode(hdc,MM_ANISOTROPIC);

pNTA = poly_head;
// one point can not be draw
while (NULL != pNTA->next)
{
hB=CreateSolidBrush(RGB(255,0,0));
SelectObject(hdc,hB); //update brush

Ellipse(hdc,pNTA->next->x-5,pNTA->next->y-5,pNTA->next->x+5,pNTA->next->y+5);
DeleteObject(hB);

pNTA = pNTA->next;
}
}

LRESULT CALLBACK WndProc
(
HWND hwnd,
UINT message,
WPARAM wParam,
LPARAM lParam
)

{ HDC hdc;
PAINTSTRUCT ps;
static BOOL LButtonDown = FALSE;
static WORD x,y;

switch(message)
{
case WM_PAINT:
hdc=BeginPaint(hwnd,&ps); //取得设备环境句柄
BeforeRelease(hdc);
EndPaint(hwnd,&ps); //释放设备环境句柄
break;
case WM_LBUTTONDOWN:
LButtonDown = FALSE;

x=LOWORD(lParam); //mouse x.
y=HIWORD(lParam); //mouse y.

{
NodeType *pNTA;
pNTA = (NodeType *)malloc(sizeof(NodeType));
if (NULL != pNTA)
{
pNTA->x = x;
pNTA->y = y;
pNTA->next = poly_head->next;
poly_head->next = pNTA;
}
}
LButtonDown = TRUE;
InvalidateRect(hwnd,NULL,FALSE);
break;
case WM_DESTROY:
{
// release poly list
NodeType *pNTA = NULL;
if (NULL != poly_head)
{
pNTA = poly_head->next;
while (NULL != pNTA)
{
poly_head->next = pNTA->next;
free(pNTA);
pNTA = poly_head->next;
}
free(poly_head);
poly_head = NULL;
}
}

PostQuitMessage(0);
break;

default:
return DefWindowProc(hwnd,message,wParam,lParam);
}
return 0;
}