提前准备好游戏要的素材，可以到爱给网去找，飞机大战我们需要的是一个我方战机图片，一个背景图，三个敌方战机的图，我方战机的图片，敌方战机的图片，并且将图片和.cpp放在同一文件夹下.
这里创建.cpp的文件是因为要用到图形库，所以创建.cpp的文件，然后图片格式都是png
1.我方飞机和背景图片的加载和贴图
#include#include //图形库头文件#define HEIGHT503#define WIDTH 700IMAGE img_bk, img_plane;//定义背景图片，玩家的类int main(){initgraph(WIDTH, HEIGHT);//初始化游戏的背景loadimage(&img_bk, "./back.png");//加载游戏背景图loadimage(&img_plane, "./1.png");//加载游戏玩家图片putimage(0, 0, &img_bk);//贴游戏背景图putimage(200,200, &img_plane);//贴玩家战机的图片getchar();//防止窗口闪退}背景图片是503*700，背景图片大小自己设置，为了让游戏体验感增强，如果铺满整个屏幕的话，会不好移动.
2.去掉飞机背后的黑色背景，使用一个算法函数
#include#include #define HEIGHT503#define WIDTH 700IMAGE img_bk, img_plane;void drawAlpha(IMAGE* picture, intpicture_x, int picture_y) //x为载入图片的X坐标，y为Y坐标{// 变量初始化DWORD* dst = GetImageBuffer();// GetImageBuffer()函数，用于获取绘图设备的显存指针，EASYX自带DWORD* draw = GetImageBuffer();DWORD* src = GetImageBuffer(picture); //获取picture的显存指针int picture_width = picture->getwidth(); //获取picture的宽度，EASYX自带int picture_height = picture->getheight(); //获取picture的高度，EASYX自带int graphWidth = getwidth(); //获取绘图区的宽度，EASYX自带int graphHeight = getheight(); //获取绘图区的高度，EASYX自带int dstX = 0;//在显存里像素的角标// 实现透明贴图 公式： Cp=αp*FP+(1-αp)*BP ， 贝叶斯定理来进行点颜色的概率计算for (int iy = 0; iy < picture_height; iy++){for (int ix = 0; ix < picture_width; ix++){int srcX = ix + iy * picture_width; //在显存里像素的角标int sa = ((src[srcX] & 0xff000000) >> 24); //0xAArrggbb;AA是透明度int sr = ((src[srcX] & 0xff0000) >> 16); //获取RGB里的Rint sg = ((src[srcX] & 0xff00) >> 8); //Gint sb = src[srcX] & 0xff;//Bif (ix >= 0 && ix <= graphWidth && iy >= 0 && iy <= graphHeight && dstX <= graphWidth * graphHeight){if ((ix + picture_x) >= 0 && (ix + picture_x) <= graphWidth)//防止出边界后循环显示{dstX = (ix + picture_x) + (iy + picture_y) * graphWidth; //在显存里像素的角标int dr = ((dst[dstX] & 0xff0000) >> 16);int dg = ((dst[dstX] & 0xff00) >> 8);int db = dst[dstX] & 0xff;draw[dstX] = ((sr * sa / 255 + dr * (255 - sa) / 255) << 16)//公式： Cp=αp*FP+(1-αp)*BP； αp=sa/255 , FP=sr , BP=dr| ((sg * sa / 255 + dg * (255 - sa) / 255) << 8) //αp=sa/255 , FP=sg , BP=dg| (sb * sa / 255 + db * (255 - sa) / 255);//αp=sa/255 , FP=sb , BP=db}}}}}int main(){initgraph(WIDTH, HEIGHT);loadimage(&img_bk, "./back.png");loadimage(&img_plane, "./1.png");putimage(0, 0, &img_bk);//贴背景前两个为图片左上角要贴在窗口的坐标drawAlpha(&img_plane, 200, 200);//贴飞机图片getchar();}这个函数我看不懂，是在网上搜的，我来解释一下三个参数，第一个是图片的地址，第二个参数，第三个参数的坐标是图片左上角从窗口的哪个位置贴，背景肯定是从窗口的左上角贴.
注意：使用这个函数在飞机移动屏幕过程中，会出现异常，不知道怎么解决，希望有大佬可以帮帮我，drawAlpha区别putimage可以把背景变透明
3.静态显示所有素材图片
#include#include #define HEIGHT503#define WIDTH 700IMAGE img_bk, img_plane, img_a, img_b, img_c,img_abullet,img_bbullet,img_cbullet,img_planebullet;struct aircraft {int x, y;};aircraft plane, a, b, c;void datainit(){plane = { 150,150 };a = { 0,0 };b = { 300,0 };c = { 450,0 };}void drawAlpha(IMAGE* picture, intpicture_x, int picture_y) //x为载入图片的X坐标，y为Y坐标{// 变量初始化DWORD* dst = GetImageBuffer();// GetImageBuffer()函数，用于获取绘图设备的显存指针，EASYX自带DWORD* draw = GetImageBuffer();DWORD* src = GetImageBuffer(picture); //获取picture的显存指针int picture_width = picture->getwidth(); //获取picture的宽度，EASYX自带int picture_height = picture->getheight(); //获取picture的高度，EASYX自带int graphWidth = getwidth(); //获取绘图区的宽度，EASYX自带int graphHeight = getheight(); //获取绘图区的高度，EASYX自带int dstX = 0;//在显存里像素的角标// 实现透明贴图 公式： Cp=αp*FP+(1-αp)*BP ， 贝叶斯定理来进行点颜色的概率计算for (int iy = 0; iy < picture_height; iy++){for (int ix = 0; ix < picture_width; ix++){int srcX = ix + iy * picture_width; //在显存里像素的角标int sa = ((src[srcX] & 0xff000000) >> 24); //0xAArrggbb;AA是透明度int sr = ((src[srcX] & 0xff0000) >> 16); //获取RGB里的Rint sg = ((src[srcX] & 0xff00) >> 8); //Gint sb = src[srcX] & 0xff;//Bif (ix >= 0 && ix <= graphWidth && iy >= 0 && iy <= graphHeight && dstX <= graphWidth * graphHeight){if ((ix + picture_x) >= 0 && (ix + picture_x) <= graphWidth)//防止出边界后循环显示{dstX = (ix + picture_x) + (iy + picture_y) * graphWidth; //在显存里像素的角标int dr = ((dst[dstX] & 0xff0000) >> 16);int dg = ((dst[dstX] & 0xff00) >> 8);int db = dst[dstX] & 0xff;draw[dstX] = ((sr * sa / 255 + dr * (255 - sa) / 255) << 16)//公式： Cp=αp*FP+(1-αp)*BP； αp=sa/255 , FP=sr , BP=dr| ((sg * sa / 255 + dg * (255 - sa) / 255) << 8) //αp=sa/255 , FP=sg , BP=dg| (sb * sa / 255 + db * (255 - sa) / 255);//αp=sa/255 , FP=sb , BP=db}}}}}void load(){loadimage(&img_bk, "./back.png");loadimage(&img_plane, "./1.png");loadimage(&img_a, "./2.png");loadimage(&img_b, "./3.png");loadimage(&img_c, "./4.png");loadimage(&img_abullet, "./5.png");loadimage(&img_bbullet, "./6.png");loadimage(&img_cbullet, "./7.png");loadimage(&img_planebullet, "./8.png");}void draw(){putimage(0, 0, &img_bk);drawAlpha(&img_plane,plane.x,plane.y);drawAlpha(&img_a, a.x, a.y);drawAlpha(&img_b, b.x, b.y);drawAlpha(&img_c, c.x, c.y);drawAlpha(&img_abullet,400,0 );//后两个参数是图片左上角在窗口要贴的位置drawAlpha(&img_bbullet,400 ,50 );drawAlpha(&img_cbullet, 400, 100);drawAlpha(&img_planebullet, 400, 150);}int main(){initgraph(WIDTH, HEIGHT);datainit();load();draw();getchar();}定义3个敌方战机，a,b,c,3个敌机的子弹abullet,bbullet,cbullet,我方战机的子弹planebullet
IMAGE img_a, img_b, img_c,img_abullet,img_bbullet,img_cbullet,img_planebullet;
定义一个结构体记录每个图片左上角要贴在窗口的坐标.四个结构体表示我方战机，3个敌方战机在窗口上的坐标，图中的初始化只是为了让图片不重叠而已。
将加载图片的函数统一放在load函数里面，将贴图片的函数放在draw中.
4.我方飞机的移动
void player_move(int speed) //处理飞机移动{if (GetAsyncKeyState(VK_UP) || GetAsyncKeyState('W')){if (plane.y > 0)plane.y -= speed;}if (GetAsyncKeyState(VK_DOWN) || GetAsyncKeyState('S')){if (plane.y + 126< HEIGHT)plane.y += speed;}if (GetAsyncKeyState(VK_LEFT) || GetAsyncKeyState('A')){if (plane.x > 0)plane.x -= speed;}if (GetAsyncKeyState(VK_RIGHT) || GetAsyncKeyState('D')){if (plane.x + 51 < WIDTH)plane.x += speed;}}这个移动函数在之前游戏里用了好多次，这里就不强调了.函数中的speed参数是我方战机的速度，每按一次会移动几个像素.这里的重点放在飞机边界的判断上，记得加双缓冲，要不然，屏幕会闪
边界的判断以及飞机的移动
if (GetAsyncKeyState(VK_DOWN) || GetAsyncKeyState('S')){if (plane.y + 126< HEIGHT)plane.y += speed;}这里加126是为了不让程序出现异常，如果正常的话应该加51，因为我方战机图片大小是51*51；如果是51的话会出现如下视频的错误，不知道为什么，请看vcr
5.敌方战机的移动
首先我们要修改一下飞机结构体的变量
struct aircraft{int x, y;int width;//敌机图片的宽度int height;//敌机图片的高度int speed;//敌机的速度int bornflag;//敌机在窗口里面置0，在外面置1};然后修改一下初始话敌机的属性.
void datainit(){plane = { 150,150 };//a = { 0,0 };/*b = { 300,0 };*//*c = { 450,0 };*/a.speed = 1;//a敌机的速度a.bornflag = 1;//a敌机是否存在b.bornflag = 1;c.bornflag = 1;a.width = 100;//a敌机的宽度a.height = 100;//a敌机的高度b.speed = 1;b.width = 80;b.height = 100;c.height = 70;c.width = 70;c.speed = 3;}敌机a的移动
敌机a的移动
如视频所示，对应的代码实现是
void ufoamove(){static int dir1 = 1;if (a.bornflag == 1){a.bornflag = 0;a.x = rand() % (WIDTH - a.width);a.y = -50;}if (a.y > 200){dir1 = 0;}else if (a.y < -150){dir1 = 1;a.bornflag = 1;}if (1 == dir1){a.y += a.speed;}else{a.y -= a.speed;}}定义一个静态变量dir,dir为1的话，表示敌机前进，dir为0，敌机后退。因为是static，所以只有第一次初始化时候是1，别的时候不执行第一句.当敌机a没在窗口里面，说明a.bornflag == 1，就将a.bornflag 置为0，敌机a要出现了，随机数生成敌机a要出现的左右方向哪个地方，y=-50;是为了初始化的时候隐藏飞机.当敌机a前进200个像素时，dir置0，让敌机a后退.当敌机向上退出屏幕50个像素时，重新dir=1;敌机向前.此时会出现在另一个位置。在主函数中加入产生随机种子函数
srand(time(NULL));包含头文件
#include#include敌机出屏幕，drawAlpha这个函数会出错，所以我们把draw中的drawAlpha都改成putimage,这样黑框框又出现了，（电子叹气）
void draw(){putimage(0, 0, &img_bk);putimage(plane.x, plane.y ,&img_plane );putimage(a.x, a.y ,&img_a);putimage(b.x, b.y ,&img_b );putimage(c.x, c.y, &img_c );putimage(400, 0 ,&img_abullet );putimage(400, 50 ,&img_bbullet);putimage(400, 100 ,&img_cbullet );putimage(400, 150, &img_planebullet );}敌机b的移动
请看vcr
敌机b的移动
对应代码
void ufobmove(){static int step = b.speed;if (b.bornflag == 1){b.bornflag = 0;b.x = rand() % (WIDTH - b.width);b.y = -b.height;}if (b.x <= 0 || b.x + b.width >= WIDTH){step = -step;}b.x += step;b.y++;if (b.y >= HEIGHT){b.bornflag = 1;}}由视频可知敌机b的移动规律是在左右移动的同时还向前移动，step如果为正，向右移动，step如果为负，表示向左移动，如果b战机没有出现在窗口内（b.bornflag == 1），将b.bornflag 置0，表示要出现，随机数生成b战机的坐标.y=-b.height;初始化先隐藏起来.如果b战机到了左右边界，step=-step;
就向相反的方向移动了，左右移动实质是在给b.x±step;然后y++,b战机在左右移动的过程中，一直往前走.当b战机出了下边界，b.bornflag = 1;表示b战机出了窗口.
敌机c的移动
请看vcr
敌机c的移动
对应的代码为
void ufocmove(){static float disx = 0, disy = 0;static float tmpx = 0, tmpy = 0;static float vx = 0, vy = 0;float step = 1000 / c.speed;if (1 == c.bornflag){c.bornflag = 0;tmpx = rand() % (WIDTH - c.width);tmpy = -c.height;disx = plane.x - tmpx;disy = plane.y - tmpy;vx = disx / step;vy = disy / step;}tmpx += vx;tmpy += vy;c.x = (int)(tmpx + 0.5);c.y = (int)(tmpy + 0.5);if (c.x < -c.width){c.bornflag = 1;}else if (c.x > WIDTH){c.bornflag = 1;}if (c.y > HEIGHT){c.bornflag = 1;}}这个c战机是要撞向我方飞机，tmpx,tmpy存放的是c战机的临时的位置，刚生成时，当然是他出生点的坐标，disx是c战机刚出来x方向上与当时我方战机x方向上的距离，同理另一个.step是，假如c.speed的速度为5的话，step==200,就是说将x方向上的距离分为200份，vx就是每一份的距离是多少像素，这里强制类型转化，c.x,c.y是整数，因为vx，vy不清楚，所以+0.5，四舍五入一下就是整数了.如果在左，右，下方向超出了，就c.bornflag = 1;离开窗口了.
6.整体代码展示
#include#include //#include//_getch();#define HEIGHT503#define WIDTH 700IMAGE img_bk, img_plane, img_a, img_b, img_c, img_abullet, img_bbullet, img_cbullet, img_planebullet;struct aircraft{int x, y;int width;int height;int speed;int bornflag;};aircraft plane, a, b, c;void datainit(){plane = { 150,150 };//a = { 0,0 };/*b = { 300,0 };*//*c = { 450,0 };*/a.speed = 1;a.bornflag = 1;b.bornflag = 1;c.bornflag = 1;a.width = 100;a.height = 100;b.speed = 1;b.width = 80;b.height = 100;c.height = 70;c.width = 70;c.speed = 3;}void drawAlpha(IMAGE* picture, intpicture_x, int picture_y) //x为载入图片的X坐标，y为Y坐标{// 变量初始化DWORD* dst = GetImageBuffer();// GetImageBuffer()函数，用于获取绘图设备的显存指针，EASYX自带DWORD* draw = GetImageBuffer();DWORD* src = GetImageBuffer(picture); //获取picture的显存指针int picture_width = picture->getwidth(); //获取picture的宽度，EASYX自带int picture_height = picture->getheight(); //获取picture的高度，EASYX自带int graphWidth = getwidth(); //获取绘图区的宽度，EASYX自带int graphHeight = getheight(); //获取绘图区的高度，EASYX自带int dstX = 0;//在显存里像素的角标// 实现透明贴图 公式： Cp=αp*FP+(1-αp)*BP ， 贝叶斯定理来进行点颜色的概率计算for (int iy = 0; iy < picture_height; iy++){for (int ix = 0; ix < picture_width; ix++){int srcX = ix + iy * picture_width; //在显存里像素的角标int sa = ((src[srcX] & 0xff000000) >> 24); //0xAArrggbb;AA是透明度int sr = ((src[srcX] & 0xff0000) >> 16); //获取RGB里的Rint sg = ((src[srcX] & 0xff00) >> 8); //Gint sb = src[srcX] & 0xff;//Bif (ix >= 0 && ix <= graphWidth && iy >= 0 && iy <= graphHeight && dstX <= graphWidth * graphHeight){if ((ix + picture_x) >= 0 && (ix + picture_x) <= graphWidth)//防止出边界后循环显示{dstX = (ix + picture_x) + (iy + picture_y) * graphWidth; //在显存里像素的角标int dr = ((dst[dstX] & 0xff0000) >> 16);int dg = ((dst[dstX] & 0xff00) >> 8);int db = dst[dstX] & 0xff;draw[dstX] = ((sr * sa / 255 + dr * (255 - sa) / 255) << 16)//公式： Cp=αp*FP+(1-αp)*BP； αp=sa/255 , FP=sr , BP=dr| ((sg * sa / 255 + dg * (255 - sa) / 255) << 8) //αp=sa/255 , FP=sg , BP=dg| (sb * sa / 255 + db * (255 - sa) / 255);//αp=sa/255 , FP=sb , BP=db}}}}}void load(){loadimage(&img_bk, "./back.png");loadimage(&img_plane, "./1.png");loadimage(&img_a, "./2.png");loadimage(&img_b, "./3.png");loadimage(&img_c, "./4.png");loadimage(&img_abullet, "./5.png");loadimage(&img_bbullet, "./6.png");loadimage(&img_cbullet, "./7.png");loadimage(&img_planebullet, "./8.png");}void draw(){putimage(0, 0, &img_bk);putimage(plane.x, plane.y ,&img_plane );putimage(a.x, a.y ,&img_a);putimage(b.x, b.y ,&img_b );putimage(c.x, c.y, &img_c );putimage(400, 0 ,&img_abullet );putimage(400, 50 ,&img_bbullet);putimage(400, 100 ,&img_cbullet );putimage(400, 150, &img_planebullet );}void player_move(int speed) //处理飞机移动{if (GetAsyncKeyState(VK_UP) || GetAsyncKeyState('W')){if (plane.y > 0)plane.y -= speed;}if (GetAsyncKeyState(VK_DOWN) || GetAsyncKeyState('S')){if (plane.y + 51< HEIGHT)plane.y += speed;}if (GetAsyncKeyState(VK_LEFT) || GetAsyncKeyState('A')){if (plane.x > 0)plane.x -= speed;}if (GetAsyncKeyState(VK_RIGHT) || GetAsyncKeyState('D')){if (plane.x + 51 < WIDTH)plane.x += speed;}}void ufoamove(){static int dir1 = 1;if (a.bornflag == 1){a.bornflag = 0;a.x = rand() % (WIDTH - a.width);a.y = -50;}if (a.y > 200){dir1 = 0;}else if (a.y < -150){dir1 = 1;a.bornflag = 1;}if (1 == dir1){a.y += a.speed;}else{a.y -= a.speed;}}void ufobmove(){static int step = b.speed;if (b.bornflag == 1){b.bornflag = 0;b.x = rand() % (WIDTH - b.width);b.y = -b.height;}if (b.x <= 0 || b.x + b.width >= WIDTH){step = -step;}b.x += step;b.y++;if (b.y >= HEIGHT){b.bornflag = 1;}}void ufocmove(){static float disx = 0, disy = 0;static float tmpx = 0, tmpy = 0;static float vx = 0, vy = 0;float step = 1000 / c.speed;if (1 == c.bornflag){c.bornflag = 0;tmpx = rand() % (WIDTH - c.width);tmpy = -c.height;disx = plane.x - tmpx;disy = plane.y - tmpy;vx = disx / step;vy = disy / step;}tmpx += vx;tmpy += vy;c.x = (int)(tmpx + 0.5);c.y = (int)(tmpy + 0.5);if (c.x < -c.width){c.bornflag = 1;}else if (c.x > WIDTH){c.bornflag = 1;}if (c.y > HEIGHT){c.bornflag = 1;}}int main(){initgraph(WIDTH, HEIGHT);BeginBatchDraw();datainit();while (1){load();draw();ufoamove();ufobmove();ufocmove();player_move(5);FlushBatchDraw();}EndBatchDraw();getchar();}