#include <windows.h> #include <math.h> LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam); #define PI 3.1415926 #define NUM 1000 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; int i; static int padding; static int xCount, yCount; //线条数 static int xClient, yClient;//窗口大小 switch (message) { case WM_CREATE: padding = 50; break; case WM_SIZE: xClient = LOWORD(lParam); yClient = HIWORD(lParam); xCount = xClient / padding - 1; yCount = yClient / padding - 1; break; case WM_PAINT: hdc = BeginPaint(hwnd, &ps); GetClientRect(hwnd, &rect); //1 //画点 // for (i = rect.left; i < rect.right;i++) // { // //画像素点--->成线 // //setpixel返回的是个颜色rgb,因为系统有时候会自动用相近颜色替换，效率不高 // //setpixelv返回bool类型，效率更高 // //但是当用这些函数绘制图形，会快速出入栈，效率不高 // SetPixel(hdc, i, 100, RGB(255, 0, 0)); // } //2 //画线 //movetoex将当前绘图位置移动到某个具体的点，可以获得之前的位置坐标 // POINT pt; // MoveToEx(hdc, 100, 50, &pt); //默认起点是左上角 // //LineTo(hdc, pt.x, pt.y); // LineTo(hdc, 150, 100); // LineTo(hdc, 300, 400); // // //getcurrentpositionex获取当前绘图点坐标 // GetCurrentPositionEx(hdc, &pt); //3 //绘制一个网格 //先绘制上到下 //获取线条数量 // for (i = 1; i <= xCount;i++) // { // MoveToEx(hdc, i*padding, 0, NULL); // LineTo(hdc, i*padding, yClient); // } // // //再绘制左到右 // for (i = 1; i <= yCount;i++) // { // MoveToEx(hdc, 0, i*padding, NULL); // LineTo(hdc, xClient, i*padding); // } //4 //绘制网格2 //rect就是客户区矩形...... // for (int x = 0; x < rect.right;x+=50) // { // MoveToEx(hdc, x, 0, NULL); // LineTo(hdc, x, rect.bottom); // } // // for (int x = 0; x < rect.bottom; x += 50) // { // MoveToEx(hdc, 0, x, NULL); // LineTo(hdc, rect.right, x); // } //5. //画一个五角星 // MoveToEx(hdc, 30, 10,NULL); // LineTo(hdc, 20, 50); // LineTo(hdc, 50, 20); // LineTo(hdc, 10, 20); // LineTo(hdc, 40, 50); // LineTo(hdc, 30, 10); //6. //折线绘制五角星 // POINT apt[] = { 30, 10, 20, 50, 50, 20, 10, 20, 40, 50, 30, 10 }; // Polyline(hdc, apt, 6); // PolylineTo(hdc, apt, 6); //会重当前位置为起点开始向顶点绘制 //7. //同时绘制多个图像 // POINT apt2[] = { // 30, 10, 20, 50, 50, 20, 10, 20, 40, 50, 30, 10, //五角星 // 120, 120, 180, 120, 120, 180,120,120, //直角三角形 // 300, 300, 300, 400, 400, 400, 400, 300,300,300 //矩形 // }; // DWORD count[] = { 6, 4, 5 }; // PolyPolyline(hdc, apt2, count, 3);; // MoveToEx(hdc, 100, 100, NULL); // LineTo(hdc, 500, 100); //8. //绘制sin曲线 // POINT apt3[400]; // double x, y,rad; // for (int i = 0; i < 400;i+=1) // { // x = i; // rad = PI / 180.0 * (360.0 / 400.0)*i; // y = sin(rad); // // apt3[i].x = x+100; // apt3[i].y = y*100+100; // } // Polyline(hdc, apt3, 400); //9. //h绘制sin曲线，规范 POINT apt4[NUM]; MoveToEx(hdc, 0, yClient / 2, NULL); LineTo(hdc, xClient, yClient / 2); for (int j = 0; j < NUM;j++) { apt4[j].x = j*xClient/NUM; apt4[j].y = (int)((1 - sin(PI * 2 / NUM*j)) / 2 * yClient); } Polyline(hdc, apt4, NUM); DrawText(hdc, L"this is my first pragram win32", -1, &rect, DT_CENTER | DT_VCENTER | DT_SINGLELINE); break; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hwnd, message, wParam, lParam); }