学习windows编程 day4 之多边矩形填充

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#include <windows.h>
#include <math.h>LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);#define R 200
#define PI 3.1415926int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
//声明全局数据：类名
static TCHAR szClassName[] = TEXT("MyWindows");
HWND hwnd;
MSG msg; //注册窗口类
WNDCLASS wndclass; wndclass.hInstance = hInstance;
wndclass.lpszClassName = szClassName;
wndclass.cbClsExtra = ;
wndclass.cbWndExtra = ;
wndclass.lpfnWndProc = WndProc;
wndclass.lpszMenuName = NULL;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.style = CS_HREDRAW; if (!RegisterClass(&wndclass))
{
MessageBox(NULL, TEXT("this program must run in Windows NT!"), szClassName, MB_ICONERROR);
return ;
} hwnd = CreateWindow(
szClassName,
TEXT("MyFirstPractice"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL
); ShowWindow(hwnd, nShowCmd);
UpdateWindow(hwnd); while (GetMessage(&msg, NULL, , ))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
} return msg.wParam;
}LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
RECT rect; static HBRUSH hBrush, hOldBrush;
// 绘制一个多边形，可填充是需要顶点的个数polygon
POINT apt1[] = { , , , , , ,, };
// 绘制一个封闭多边形polyline需要顶点数+1 注意：用线绘制的封闭图像不具有填充能力
// POINT apt2[5] = { 400, 200, 500, 100, 600, 200, 500, 300, 400, 200 };
POINT apt2[];
int cxClient, cyClient; //星星的中心位置 switch (message)
{
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
GetClientRect(hwnd, &rect); cxClient = rect.right / ;
cyClient = rect.bottom / ; //获取五个顶点
//左上顶点
apt2[].x = cxClient - (int)(R*cos(PI / ));
apt2[].y = cyClient - (int)(R*sin(PI / )); //右上顶点
apt2[].x = cxClient + (int)(R*cos(PI / ));
apt2[].y = cyClient - (int)(R*sin(PI / )); //左下顶点
apt2[].x = cxClient - (int)(R*cos(PI / ));
apt2[].y = cyClient + (int)(R*sin(PI / )); //上顶点
apt2[].x = cxClient;
apt2[].y = cyClient - R; //右下顶点
apt2[].x = cxClient + (int)(R*cos(PI / ));
apt2[].y = cyClient + (int)(R*sin(PI / )); hBrush = CreateSolidBrush(RGB(,,));
hOldBrush = SelectObject(hdc, hBrush);// SetPolyFillMode(hdc, ALTERNATE); //交替填充
SetPolyFillMode(hdc, WINDING); //螺旋填充，填充所有能够一笔完成的图形
//
Polygon(hdc, apt2, );
// Polyline(hdc, apt2, 5);
//
SelectObject(hdc, hOldBrush);
DeleteObject(hOldBrush);
EndPaint(hwnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage();
return ;
} return DefWindowProc(hwnd, message, wParam, lParam);
}

#include <windows.h>#include <math.h>
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
#define R 200#define PI 3.1415926
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd){//声明全局数据：类名static TCHAR szClassName[] = TEXT("MyWindows");HWND hwnd;MSG msg;
//注册窗口类WNDCLASS wndclass;
wndclass.hInstance = hInstance;wndclass.lpszClassName = szClassName;wndclass.cbClsExtra = 0;wndclass.cbWndExtra = 0;wndclass.lpfnWndProc = WndProc;wndclass.lpszMenuName = NULL;wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);wndclass.style = CS_HREDRAW;
if (!RegisterClass(&wndclass)){MessageBox(NULL, TEXT("this program must run in Windows NT!"), szClassName, MB_ICONERROR);return 0;}
hwnd = CreateWindow(szClassName,TEXT("MyFirstPractice"),WS_OVERLAPPEDWINDOW,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,NULL,NULL,hInstance,NULL);
ShowWindow(hwnd, nShowCmd);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;RECT rect;
static HBRUSH hBrush, hOldBrush;//绘制一个多边形，可填充是需要顶点的个数polygonPOINT apt1[4] = { 100, 200, 200, 100, 300, 200,200, 300 };//绘制一个封闭多边形polyline需要顶点数+1注意：用线绘制的封闭图像不具有填充能力//POINT apt2[5] = { 400, 200, 500, 100, 600, 200, 500, 300, 400, 200 };POINT apt2[5];int cxClient, cyClient;//星星的中心位置
switch (message){case WM_PAINT:hdc = BeginPaint(hwnd, &ps);GetClientRect(hwnd, &rect);
cxClient = rect.right / 2;cyClient = rect.bottom / 2;
//获取五个顶点//左上顶点apt2[0].x = cxClient - (int)(R*cos(PI / 5));apt2[0].y = cyClient - (int)(R*sin(PI / 5));
//右上顶点apt2[1].x = cxClient + (int)(R*cos(PI / 5));apt2[1].y = cyClient - (int)(R*sin(PI / 5));
//左下顶点apt2[2].x = cxClient - (int)(R*cos(PI / 5));apt2[2].y = cyClient + (int)(R*sin(PI / 5));
//上顶点apt2[3].x = cxClient;apt2[3].y = cyClient - R;
//右下顶点apt2[4].x = cxClient + (int)(R*cos(PI / 5));apt2[4].y = cyClient + (int)(R*sin(PI / 5));
hBrush = CreateSolidBrush(RGB(255,255,0)); hOldBrush = SelectObject(hdc, hBrush);
//SetPolyFillMode(hdc, ALTERNATE);//交替填充SetPolyFillMode(hdc, WINDING);//螺旋填充，填充所有能够一笔完成的图形// Polygon(hdc, apt2, 5);// Polyline(hdc, apt2, 5);// SelectObject(hdc, hOldBrush); DeleteObject(hOldBrush);EndPaint(hwnd, &ps);break;case WM_DESTROY:PostQuitMessage(0);return 0;}