#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 = ;

    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;

    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 = ;

        break;

    case WM_SIZE:

        xClient = LOWORD(lParam);

        yClient = HIWORD(lParam);

        xCount = xClient / padding - ;

        yCount = yClient / padding - ;

        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, , yClient / , NULL);

        LineTo(hdc, xClient, yClient / );

        for (int j = ; j < NUM;j++)

        {

            apt4[j].x = j*xClient/NUM;

            apt4[j].y = (int)(( - sin(PI *  / NUM*j)) /  * yClient);

        }

        Polyline(hdc, apt4, NUM);

        DrawText(hdc, L"this is my first pragram win32", -, &rect, DT_CENTER | DT_VCENTER | DT_SINGLELINE);

        break;

    case WM_DESTROY:

        PostQuitMessage();

        return ;

    }

    return DefWindowProc(hwnd, message, wParam, lParam);

}