画一个圆角矩形、椭圆
#include <windows.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
/* The 'main' function of Win32 GUI programs: this is where execution starts */
int WINAPI WinMain(
HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
static TCHAR szClassName[] = TEXT("HelloWin"); /*窗口类名*/
HWND hwnd; /*窗口句柄*/
MSG msg; /*消息*/
WNDCLASS wndclass; /*窗口类*/
/***********第一步：注册窗口类*************/
/*为窗口类各个字段赋值*/
wndclass.style = CS_HREDRAW | CS_VREDRAW; /*窗口风格*/
wndclass.lpfnWndProc = WndProc; /*窗口过程*/
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance; /*当前窗口句柄*/
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION); /*窗口图标*/
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);/*鼠标样式*/
wndclass.hbrBackground= (HBRUSH)GetStockObject(WHITE_BRUSH);/*窗口背景画刷*/
wndclass.lpszMenuName = NULL; /*窗口菜单*/
wndclass.lpszClassName= szClassName; /*窗口类名*/
/*注册窗口*/
RegisterClass(&wndclass);
/*************第二步：创建窗口(并让窗口显示出来)***************/
hwnd = CreateWindow(
szClassName, /*窗口名字*/
TEXT("Welcome"), /*窗口标题*/
WS_OVERLAPPEDWINDOW, /*窗口风格*/
CW_USEDEFAULT, /*初始化x轴的位置*/
CW_USEDEFAULT, /*初始化y轴的位置*/
640, /*窗口宽度*/
480, /*窗口高度*/
NULL, /*父窗口句柄*/
NULL, /*窗口菜单句柄*/
hInstance, /*当前窗口句柄*/
NULL /*不使用该值*/
);
if(hwnd == NULL)
{
MessageBox(NULL, "创建窗口出错！", "Error", MB_OK);
return -1;
}
/*显示窗口*/
ShowWindow(hwnd, nCmdShow);
/*更新（绘制）窗口*/
UpdateWindow(hwnd);
/*************第三步：消息循环*************/
while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg); /*翻译消息*/
DispatchMessage(&msg); /*分派消息*/
}
return msg.wParam; /*当GetMessage程序返回FALSE是程序结束*/
}
/*************第四步：窗口过程*****************/
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
switch(message)
{
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
/*画圆角矩形，左上角坐标（50,50），右下角坐标（150,150），圆角宽10，高15*/
RoundRect(hdc, 50, 50, 150, 150, 10, 15);
EndPaint(hwnd, &ps);
return 0;
/*窗口销毁消息*/
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
椭圆函数原型：
BOOL Ellipse(
HDC hdc, //设备环境句柄
int nLeftRect, //左上角x坐标
int nTopRect, //左上角y坐标
int nRightRect, //右下角x坐标
int nBottomRect //右下角y坐标
);
画直线：
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
MoveToEx(hdc, 150, 150, NULL); //设定起始点,不保存当前点坐标
LineTo(hdc,200, 60); //第一条线
LineTo(hdc, 250, 150); //第二条线
LineTo(hdc, 150, 150); //第三条线
EndPaint(hwnd, &ps);
return 0 ;