找茬

// 仿写_4_找茬辅助.cpp : 定义应用程序的入口点。
//

#include "stdafx.h"
#include "仿写_4_找茬辅助.h"
#include <windowsx.h>
#include <vector>
using std::vector;

#define MAX_LOADSTRING 100

// 全局变量: 
HINSTANCE hInst;                                // 当前实例
TCHAR szTitle[MAX_LOADSTRING];                    // 标题栏文本
TCHAR szWindowClass[MAX_LOADSTRING];            // 主窗口类名

// 此代码模块中包含的函数的前向声明: 
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPTSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);

     // TODO:  在此放置代码。
    MSG msg;
    HACCEL hAccelTable;

    // 初始化全局字符串
    LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadString(hInstance, IDC__4_, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

    // 执行应用程序初始化: 
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC__4_));

    // 主消息循环: 
    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int) msg.wParam;
}



//
//  函数:  MyRegisterClass()
//
//  目的:  注册窗口类。
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style            = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra        = 0;
    wcex.cbWndExtra        = 0;
    wcex.hInstance        = hInstance;
    wcex.hIcon            = LoadIcon(hInstance, MAKEINTRESOURCE(IDI__4_));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground    = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName    = MAKEINTRESOURCE(IDC__4_);
    wcex.lpszClassName    = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

    return RegisterClassEx(&wcex);
}

//
//   函数:  InitInstance(HINSTANCE, int)
//
//   目的:  保存实例句柄并创建主窗口
//
//   注释: 
//
//        在此函数中，我们在全局变量中保存实例句柄并
//        创建和显示主程序窗口。
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // 将实例句柄存储在全局变量中

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, 1600, 700, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

static HBITMAP hBitmap1;
static HBITMAP hBitmap2;
static BOOL   helpFlag = 0;
vector<COORD> vcPoints;
void ShowPicture(HWND hWnd){

    //加载图片
    hBitmap1 = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP1));
    hBitmap2 = LoadBitmap(hInst, MAKEINTRESOURCE(IDB_BITMAP2));

    //获取图片信息
    BITMAP bitmap;
    GetObject(hBitmap1, sizeof(BITMAP), &bitmap);

    //获取DC
    HDC hdc = GetDC(hWnd);
    HDC hdcMem = CreateCompatibleDC(hdc);

    //选入图片1
    SelectObject(hdcMem, hBitmap1);

    //复制到DC，完成图片1显示
    BitBlt(hdc, 0, 0, bitmap.bmWidth, bitmap.bmHeight, hdcMem, 0, 0, SRCCOPY);

    //选入图片2
    SelectObject(hdcMem, hBitmap2);

    //复制到DC，完成图片2显示
    BitBlt(hdc, bitmap.bmWidth + 10, 0, bitmap.bmWidth, bitmap.bmHeight, hdcMem, 0, 0, SRCCOPY);
        
    if (helpFlag)
    {
        //找茬
        //设置图片
        SelectObject(hdc   , hBitmap1);
        SelectObject(hdcMem, hBitmap2);
        //设置采样系数 
        DWORD dwAmendValue = 40;     //x，y轴 相差不超过40的点只算一个点     
        DWORD dwSampling = 3;         //每三个像素点找一次，加快匹配速度
        //清空容器
        vcPoints.clear();

        COORD point = {-1,-1};        
        //找出不一样的地方
        for (int row = 0; row <= bitmap.bmHeight; row += dwSampling)
        {
            for (int col = 0; col <= bitmap.bmWidth; col += dwSampling)
            {
                COLORREF src = GetPixel(hdc   , col, row);//图1
                COLORREF dec = GetPixel(hdcMem, col, row);//图2
                if (src != dec)
                {
                    //精确找到不同的像素点，仅作测试用
                    //SetPixel(hdc, col, row, 255);
 
                     //第一个不同点
                     if (point.X == -1)
                     {
                         point.X = col;
                         point.Y = row;
                         continue;
                     }
                     //两点比较近的话，看成是一个不同的点
                    if ((abs(col - point.X) + abs(row - point.Y)) < dwAmendValue)
                     {
                         point.X = (col + point.X) / 2;
                         point.Y = (row + point.Y) / 2;
                         continue;
                     }
                     //找到了一个新的点，把上一个点加入容器，并重新开始
                    if ((abs(col - point.X) + abs(row - point.Y)) > dwAmendValue)
                     {
                         //把上一个点加入容器
                        vcPoints.push_back(point);
                         //然后开始记录新的不同点
                         point.X = col;
                         point.Y = row;
                         continue;
                     }                    
                }
                //结束的时候最后一个不同点也加到向量内
                if (((abs(col - bitmap.bmWidth) + abs(row - bitmap.bmHeight)))<dwSampling*dwSampling)
                {
                    vcPoints.push_back(point);
                }
            }
        }
    }    

    ReleaseDC(hWnd,hdc);
    DeleteDC(hdcMem);
    DeleteObject(hBitmap1);
    DeleteObject(hBitmap2);
}

void ShowDifferent(HWND hWnd){

    if (vcPoints.size()<0)
    {
        return;
    }
    //获取DC
    HDC hdc = GetDC(hWnd);

    //显示不一样的地方
    HPEN  hPen = CreatePen(PS_SOLID, 4, RGB(246, 106, 44));
    HBRUSH hBrush = GetStockBrush(NULL_BRUSH);
    SelectObject(hdc, hPen);
    SelectObject(hdc, hBrush);
    for (size_t i = 0; i < vcPoints.size(); i++)
    {
        Ellipse(hdc, vcPoints[i].X - 30, vcPoints[i].Y - 30, vcPoints[i].X + 30, vcPoints[i].Y + 30);
    }
    ReleaseDC(hWnd, hdc);
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;
    switch (message)
    {
    case WM_COMMAND:
        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        // 分析菜单选择: 
        switch (wmId)
        {
        case IDM_HELP:
            //既找茬，又显示图片，还显示结果
            helpFlag = TRUE;            
            ShowPicture(hWnd);
            ShowDifferent(hWnd);
            break;
        case IDM_START:
            //不找茬，只显示图片，不显示结果
            helpFlag = FALSE;
            ShowPicture(hWnd);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
        break;
    case WM_PAINT:
    {
        hdc = BeginPaint(hWnd, &ps);
        // TODO:  在此添加任意绘图代码...
        //响应paint消息时，不找茬，只显示图片，以及结果（无结果就不显示结果）。
        helpFlag = FALSE;
        ShowPicture(hWnd);
        ShowDifferent(hWnd);

        EndPaint(hWnd, &ps);
    }    break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}