API简单绘图3
#include<windows.h>
#include<string.h>
#include<stdlib.h>
#include<stdio.h>
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[]="基本绘图";
char lpszTitle[]="My_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
);
ShowWindow(hwnd,nCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&Msg,NULL,0,0))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
LRESULT CALLBACK WndProc
(
HWND hwnd,
UINT message,
WPARAM wParam,
LPARAM lParam
)
{
HDC hdc;
PAINTSTRUCT ps;
HPEN hP;//定义画笔句柄
HBRUSH hB;//定义画刷句柄
switch(message)
{
case WM_PAINT: //通过响应WM_PAINT消息完成绘图工作
hP=CreatePen(PS_DASHDOT,1,RGB(0,255,0));//自定义一个画笔，该画笔为绿色,所画线条为点划线，宽度为1
hB=CreateHatchBrush(HS_CROSS,RGB(255,0,0));//自定义一个红色网格状画刷
hdc=BeginPaint(hwnd,&ps);//取得设备环境句柄
SetMapMode(hdc,MM_TEXT);//设置映象模式，此程序使用默认模式，可省略
//使用当前默认画笔.画刷进行绘图
Rectangle(hdc,130,60,270,200);//使用当前画笔绘制矩形，用当前画刷填充
SelectObject(hdc,hB);//更新画刷，设置自定义画刷为当前画刷
Ellipse(hdc,130,70,270,190);//使用当前画笔绘制一个椭圆，用当前画刷填充椭圆
SelectObject(hdc,hP);//更新画笔，设置自定义画笔为当前画笔
MoveToEx(hdc,100,130,NULL);//使用当前画笔绘制轴线
LineTo(hdc,300,130);
MoveToEx(hdc,200,30,NULL);
LineTo(hdc,200,230);
EndPaint(hwnd,&ps);//释放设备环境句柄
break;
case WM_DESTROY:
DeleteObject(hP);//退出窗口时删除画笔
DeleteObject(hB);//退出窗口时删除黑色画刷
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,message,wParam,lParam);
}
return 0;
}