本文主要是介绍Visual C++游戏编程基础之追逐移动，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
一、基本思路
1.追逐移动的实现与飞机追随鼠标光标原理类似；
2.现在小鸟作为追逐者，设定其贴图坐标为(nowX-25,nowY-16)，其中(nowX,nowY)是飞机的贴图坐标；
3.通过判断小鸟贴图坐标的X坐标与nowX-25谁大谁小，来决定小鸟在飞机左边还是右边，从而决定贴哪张图；
二、效果
三、代码实现
#include "stdafx.h"
#include <stdio.h>HINSTANCE hInst;
HBITMAP bg,ship,bird;
HDC hdc,mdc,bufdc;
HWND hWnd;
DWORD tPre,tNow;
int x,y,nowX,nowY;
int w=0;
POINT p[3];ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
void MyPaint(HDC hdc);int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{MSG msg;MyRegisterClass(hInstance);if (!InitInstance (hInstance, nCmdShow)) {return FALSE;}while( msg.message!=WM_QUIT ){if( PeekMessage( &msg, NULL, 0,0 ,PM_REMOVE) ){TranslateMessage( &msg );DispatchMessage( &msg );}else{tNow = GetTickCount();if(tNow-tPre >= 40)MyPaint(hdc);}}return msg.wParam;
}ATOM MyRegisterClass(HINSTANCE hInstance)
{WNDCLASSEX wcex;wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;wcex.lpfnWndProc = (WNDPROC)WndProc;wcex.cbClsExtra = 0;wcex.cbWndExtra = 0;wcex.hInstance = hInstance;wcex.hIcon = NULL;wcex.hCursor = NULL;wcex.hCursor = LoadCursor(NULL, IDC_ARROW);wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);wcex.lpszMenuName = NULL;wcex.lpszClassName = "canvas";wcex.hIconSm = NULL;return RegisterClassEx(&wcex);
}BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{HBITMAP bmp;POINT pt,lt,rb;RECT rect;hInst = hInstance;hWnd = CreateWindow("canvas", "绘图窗口" , WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);if (!hWnd){return FALSE;}MoveWindow(hWnd,100,100,640,480,true);ShowWindow(hWnd, nCmdShow);UpdateWindow(hWnd);hdc = GetDC(hWnd);mdc = CreateCompatibleDC(hdc);bufdc = CreateCompatibleDC(hdc);bmp = CreateCompatibleBitmap(hdc,640,480);SelectObject(mdc,bmp);bg = (HBITMAP)LoadImage(NULL,"bg.bmp",IMAGE_BITMAP,648,480,LR_LOADFROMFILE);ship = (HBITMAP)LoadImage(NULL,"ship.bmp",IMAGE_BITMAP,100,148,LR_LOADFROMFILE);bird = (HBITMAP)LoadImage(NULL,"bird.bmp",IMAGE_BITMAP,122,122,LR_LOADFROMFILE);x = 300;y = 300;nowX = 300;nowY = 300;pt.x = 300;pt.y = 300;ClientToScreen(hWnd,&pt);//窗口坐标转换成屏幕坐标SetCursorPos(pt.x,pt.y);//设置鼠标光标位置ShowCursor(false);//隐藏鼠标光标 GetClientRect(hWnd,&rect);//获取窗口区域内矩形lt.x = rect.left;lt.y = rect.top;rb.x = rect.right;rb.y = rect.bottom;//获取左上角和右下角的坐标ClientToScreen(hWnd,<);ClientToScreen(hWnd,&rb);rect.left = lt.x;rect.top = lt.y;rect.right = rb.x;rect.bottom = rb.y;ClipCursor(&rect);//限制鼠标光标的移动区域，该函数参数是相对屏幕坐标而言的//设置3只小鸟的贴图坐标p[0].x = 30;p[0].y = 100;p[1].x = 250;p[1].y = 250;p[2].x = 500;p[2].y = 400;MyPaint(hdc);return TRUE;
}void MyPaint(HDC hdc)
{int i;SelectObject(bufdc,bg);BitBlt(mdc,0,0,w,480,bufdc,640-w,0,SRCCOPY);BitBlt(mdc,w,0,640-w,480,bufdc,0,0,SRCCOPY);if(nowX < x){nowX += 10;if(nowX > x)nowX = x;}else{nowX -=10;if(nowX < x)nowX = x;}if(nowY < y){nowY += 10;if(nowY > y)nowY = y;}else{nowY -= 10;if(nowY < y)nowY = y;}SelectObject(bufdc,ship);BitBlt(mdc,nowX,nowY,100,74,bufdc,0,74,SRCAND);BitBlt(mdc,nowX,nowY,100,74,bufdc,0,0,SRCPAINT);SelectObject(bufdc,bird);for(i=0;i<3;i++){if(rand()%3 != 1) {if(p[i].y > nowY-16) p[i].y -= 5;elsep[i].y += 5;if(p[i].x > nowX-25)//鸟的贴图坐标为(nowX+25,nowY+16)p[i].x -= 5;elsep[i].x += 5;}if(p[i].x > nowX-25) //飞机在小鸟的左边，贴方向向左的小鸟图片{BitBlt(mdc,p[i].x,p[i].y,61,61,bufdc,61,61,SRCAND);BitBlt(mdc,p[i].x,p[i].y,61,61,bufdc,0,61,SRCPAINT);}else{BitBlt(mdc,p[i].x,p[i].y,61,61,bufdc,61,0,SRCAND);//贴方向向右的小鸟图片BitBlt(mdc,p[i].x,p[i].y,61,61,bufdc,0,0,SRCPAINT);}}BitBlt(hdc,0,0,640,480,mdc,0,0,SRCCOPY);tPre = GetTickCount();w += 10;if(w==640)w = 0;
}LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{switch (message){case WM_KEYDOWN: if(wParam==VK_ESCAPE) PostQuitMessage(0);break;case WM_MOUSEMOVE:x = LOWORD(lParam); if(x > 530)x = 530;else if(x < 0)x = 0;y = HIWORD(lParam); if(y > 380)y = 380;else if(y < 0)y = 0;break;case WM_DESTROY: ClipCursor(NULL); DeleteDC(mdc);DeleteDC(bufdc);DeleteObject(bg);DeleteObject(ship);DeleteObject(bird);ReleaseDC(hWnd,hdc);PostQuitMessage(0);break;default: return DefWindowProc(hWnd, message, wParam, lParam);}return 0;
}
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