左键实现 加线条，右键实现指定位置的点消失，现时删除线。
// delpoint.cpp : 定义应用程序的入口点。
//#include "stdafx.h"
#include "delpoint.h"#define MAX_LOADSTRING 100typedef struct tag_POINT{long x;long y;struct tag_POINT *next;
}POINT_m, *PPOINT_m;
PPOINT_m Head=NULL, p=NULL;
PPOINT_m cur=Head, pre=NULL, delNode=NULL;int Add_Point(PPOINT_m *HEAD,PPOINT_m node)//返回链表里有多少个结点； Head是实参，HEAD是形参 //尾部插入结点
{PPOINT_m p;if((*HEAD)==NULL)//一个结点都没有{(*HEAD)=node;}else//至少有一个结点{p=(*HEAD);while(p->next!=NULL){p=p->next;}p->next=node;}return 0;}int DEL_Point(PPOINT_m *HEAD,int pos,PPOINT_m node)
{}POINT ls_point;
// 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(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPTSTR lpCmdLine,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_DELPOINT, 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_DELPOINT));// 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。
//
// 注释:
//
// 仅当希望
// 此代码与添加到 Windows 95 中的“RegisterClassEx”
// 函数之前的 Win32 系统兼容时，才需要此函数及其用法。调用此函数十分重要，
// 这样应用程序就可以获得关联的
// “格式正确的”小图标。
//
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_DELPOINT));wcex.hCursor = LoadCursor(NULL, IDC_ARROW);wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);wcex.lpszMenuName = MAKEINTRESOURCE(IDC_DELPOINT);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, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);if (!hWnd){return FALSE;}ShowWindow(hWnd, nCmdShow);UpdateWindow(hWnd);return TRUE;
}//
// 函数: WndProc(HWND, UINT, WPARAM, LPARAM)
//
// 目的: 处理主窗口的消息。
//
// WM_COMMAND - 处理应用程序菜单
// WM_PAINT - 绘制主窗口
// WM_DESTROY - 发送退出消息并返回
//
//
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_ABOUT:DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);break;case IDM_EXIT:DestroyWindow(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...PPOINT_m p;p=Head;TextOut(hdc,0,0,_T("Hello, Windows!"),15);while(p){MoveToEx(hdc,p->x,p->y,&ls_point);if(p->next!=NULL){LineTo(hdc,p->next->x,p->next->y);p=p->next;}else{break;}}EndPaint(hWnd, &ps);break;case WM_LBUTTONDOWN: //画节点p=(PPOINT_m)malloc(sizeof(POINT_m));p->x=lParam&0x0000FFFF; //x y是通过LBUTTON这个消息里获得的p->y=(lParam>>16);p->next=NULL;Add_Point(&Head,p);InvalidateRect(hWnd,NULL,TRUE);break;case WM_RBUTTONDOWN:p=Head;p->x=lParam&0x0000FFFF; p->y=(lParam>>16);DEL_Point(&Head,p);InvalidateRect(hWnd,NULL,TRUE);break;case WM_DESTROY:PostQuitMessage(0);break;default:return DefWindowProc(hWnd, message, wParam, lParam);}return 0;
}// “关于”框的消息处理程序。
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{UNREFERENCED_PARAMETER(lParam);switch (message){case WM_INITDIALOG:return (INT_PTR)TRUE;case WM_COMMAND:if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL){EndDialog(hDlg, LOWORD(wParam));return (INT_PTR)TRUE;}break;}return (INT_PTR)FALSE;
}
)
