彩色小球祖玛：C++入门——实现“祖玛”游戏

参考

《C和C++游戏趣味编程》 童晶

祖玛游戏

游戏的思路是，各种颜色的小球沿着轨道移动，玩家必须阻止小球进入轨道终点的城堡。玩家移动鼠标控制炮台旋转，按下鼠标右键更换小球颜色，点击鼠标左键发射小球。发射的小球进入轨道，如果周围有连续3个相同颜色的小球即可消除

顶点类

游戏中小球会沿着固定的轨迹移动，而轨迹可由一些离散的顶点组成，定义顶点类：

class Point{public:float x, y;Point(){}Point(float ix, float iy){x = ix;y = iy;}};

轨迹类

在Point的基础上，定义轨迹类，并添加draw()成员函数基于关键点绘制圆和连线：

class Path{public:vector<Point> keyPoints;void draw(){setlinecolor(RGB(0, 0, 0));setfillcolor(RGB(0, 0, 0));for (int i = 0; i < keyPoints.size(); i++){fillcircle(keyPoints[i].x, keyPoints[i].y, 8);}for (int i = 0; i < keyPoints.size() - 1; i++){line(keyPoints[i].x, keyPoints[i].y, keyPoints[i + 1].x, keyPoints[i + 1].y);}}};

进一步，在关键点的连线上进行等间隔采样，小球可以在这些稠密的采样点上移动，从而实现运动的效果：

class Path{public:vector<Point> keyPoints;float sampleInterval; // 采样间隔vector<Point> allPoints; // 所有采样得到的点void getAllPoints(){int i;for (i = 0; i < keyPoints.size() - 1; i++){float xd = keyPoints[i + 1].x - keyPoints[i].x;float yd = keyPoints[i + 1].y - keyPoints[i].y;float length = sqrt(xd * xd + yd * yd);int num = length / sampleInterval;for (int j = 0; j < num; j++){float x_sample = keyPoints[i].x + j * xd / num;float y_sample = keyPoints[i].y + j * yd / num;allPoints.push_back(Point(x_sample, y_sample));}}}void draw(){setlinecolor(RGB(0, 0, 0));setfillcolor(RGB(0, 0, 0));for (int i = 0; i < keyPoints.size() - 1; i++) // 将关键点依次连接形成多条线段{line(keyPoints[i].x, keyPoints[i].y, keyPoints[i + 1].x, keyPoints[i + 1].y);}for (int i = 0; i < allPoints.size(); i++) // 在所有采样点处画一个小圆点{fillcircle(allPoints[i].x, allPoints[i].y, 3);}}

绘制出所有的采样点：

#include <graphics.h>#include <conio.h>#include <vector>using namespace std;#define WIDTH 1000#define HEIGHT 700class Point{public:float x, y;Point(){}Point(float ix, float iy){x = ix;y = iy;}};class Path{public:vector<Point> keyPoints;float sampleInterval; // 采样间隔vector<Point> allPoints; // 所有采样得到的点void getAllPoints(){int i;for (i = 0; i < keyPoints.size() - 1; i++){float xd = keyPoints[i + 1].x - keyPoints[i].x;float yd = keyPoints[i + 1].y - keyPoints[i].y;float length = sqrt(xd * xd + yd * yd);int num = length / sampleInterval;for (int j = 0; j < num; j++){float x_sample = keyPoints[i].x + j * xd / num;float y_sample = keyPoints[i].y + j * yd / num;allPoints.push_back(Point(x_sample, y_sample));}}}void draw(){setlinecolor(RGB(0, 0, 0));setfillcolor(RGB(0, 0, 0));for (int i = 0; i < keyPoints.size() - 1; i++) // 将关键点依次连接形成多条线段{line(keyPoints[i].x, keyPoints[i].y, keyPoints[i + 1].x, keyPoints[i + 1].y);}for (int i = 0; i < allPoints.size(); i++) // 在所有采样点处画一个小圆点{fillcircle(allPoints[i].x, allPoints[i].y, 3);}}};Path path;void startup(){initgraph(WIDTH, HEIGHT);setbkcolor(WHITE);cleardevice();path.keyPoints.push_back(Point(100, 600));path.keyPoints.push_back(Point(900, 600));path.keyPoints.push_back(Point(900, 100));path.keyPoints.push_back(Point(100, 100));path.sampleInterval = 10;path.getAllPoints();BeginBatchDraw();}void show(){cleardevice();path.draw();FlushBatchDraw();Sleep(1);}int main(){startup();while (1){show();}return 0;}

小球类

小球一共有5种颜色，定义数组存储：

#define ColorNum 5COLORREF colors[ColorNum] = { RED, BLUE, GREEN, YELLOW, MAGENTA };

定义小球类，添加成员函数movetoIndexInPath()让小球移动到轨迹相应位置：

class Ball{public:Point center;float radius;int colorId;int indexInPath; // 小球位置在Path的allPoints中的对应序号void draw(){setlinecolor(colors[colorId]);setfillcolor(colors[colorId]);fillcircle(center.x, center.y, radius);}void movetoIndexPath(Path path){center = path.allPoints[indexInPath];}void initiate(Path path){radius = Radius;indexInPath = 0;movetoIndexPath(path);colorId = rand() % ColorNum;}};

修改startup()，向轨迹中放置30个小球：

path.sampleInterval = Radius / 5;path.getAllPoints();for (int i = 30; i >= 0; i--){Ball ball;ball.initiate(path);ball.indexInPath = i * (2 * ball.radius / path.sampleInterval);ball.movetoIndexPath(path);balls.push_back(ball);}

小球自动运动

在Ball类中新增成员变量direction，设定小球沿着轨迹线的移动方向，1向终点运动，-1向起点运动，0暂停。initiate()中让小球初始状态为静止：

int direction;void initiate(Path path){radius = Radius;indexInPath = 0;direction = 0;movetoIndexPath(path);colorId = rand() % ColorNum;}

定义changeIndexbyDirection()成员函数，用于判断移动方向并移动：

void changeIndexbyDirection(Path path){if (direction == 1 && indexInPath + 1 < path.allPoints.size()){indexInPath++;}else if (direction == -1 && indexInPath - 1 >= 0){indexInPath--;}}

小球运动的源动力来自于最后一个在起点处添加的小球。将最接近起点的小球的direction设为1，如果终点方向前面一个小球和这个小球相切，则其direction也等于1，否则为0。在updateWithoutInput()中实现：

void updateWithoutInput(){if (balls[0].indexInPath >= path.allPoints.size() - 1) // 第一个求到了终点，游戏失败{return;}int i;for (i = 0; i < balls.size(); i++){balls[i].direction = 0;}i = balls.size() - 1; // 最后一个小球balls[i].direction = 1; // 最后一个小球向前运动while (i > 0){if (balls[i - 1].indexInPath - balls[i].indexInPath <= 2 * Radius / path.sampleInterval) // 前后两个小球相切{balls[i - 1].direction = 1;balls[i - 1].indexInPath = balls[i].indexInPath + 2 * Radius / path.sampleInterval;i--;}else{break;}}for (int i = 0; i < balls.size(); i++) // 小球根据direction更新位置{balls[i].movetoIndexPath(path);balls[i].changeIndexbyDirection(path);}Sleep(50);}

小球的插入与消除

遍历balls中所有小球，找到被鼠标点击的小球，然后将当前小球复制一份，插入到被点击的小球的位置，前面的小球依次向轨迹线终点方向移动：

void updateWithInput(){int i, j;ExMessage e;while (peekmessage(&e)){if (e.message == WM_LBUTTONDOWN){for (i = 0; i < balls.size(); i++){float distance = Distance(balls[i].center.x, balls[i].center.y, e.x, e.y);if (distance < Radius){Ball fireball = balls[i];balls.insert(balls.begin() + i, fireball); // 复制一个小球插入for (j = i; j >= 0; j--){if (balls[j].indexInPath - balls[j + 1].indexInPath <= 0){balls[j].indexInPath = balls[j + 1].indexInPath + 2 * Radius / path.sampleInterval;}else{break;}}return;}}}}}

对被鼠标点击的小球周围进行判断，如果有位置连续、颜色相同且数目大于等于3的小球，就将这些小球删除：

int eraseSameColorBalls(int i, Ball fireball, Path& path, vector<Ball>& balls){vector<int> sameColorIndexes; // 记录与插入小球颜色一样的序号int forward = i;int backward = i;sameColorIndexes.push_back(i);while (forward > 0 && balls[forward].colorId == fireball.colorId) // 向终点方向寻找{sameColorIndexes.push_back(forward);if (balls[forward - 1].indexInPath - balls[forward].indexInPath > 2 * Radius / path.sampleInterval){break;}forward--;}if (forward == 0 && balls[0].colorId == fireball.colorId) // 临界情况{sameColorIndexes.push_back(forward);}while (backward < balls.size() - 1 && balls[backward].colorId == fireball.colorId) // 向起点方向寻找{sameColorIndexes.push_back(backward);if (balls[backward].indexInPath - balls[backward + 1].indexInPath > 2 * Radius / path.sampleInterval){break;}backward++;}if (backward == balls.size() - 1 && balls[balls.size() - 1].colorId == fireball.colorId){sameColorIndexes.push_back(backward);}sort(sameColorIndexes.begin(), sameColorIndexes.end());vector<int>::iterator ite = unique(sameColorIndexes.begin(), sameColorIndexes.end()); // 去重sameColorIndexes.erase(ite, sameColorIndexes.end());int NumSameColors = sameColorIndexes.size();if (NumSameColors >= 3){int minIndex = sameColorIndexes[0];int maxIndex = sameColorIndexes[NumSameColors - 1];balls.erase(balls.begin() + minIndex, balls.begin() + maxIndex + 1); // 删除同颜色小球return NumSameColors;}return 0;}

炮台类

定义炮台类：

class Cannon{public:IMAGE im;IMAGE im_rotate;float x, y;Ball ball;float angle;void draw(){rotateimage(&im_rotate, &im, angle, RGB(160, 211, 255), false, false);putimage(x - im.getwidth() / 2, y - im.getheight() / 2, &im_rotate);ball.draw();}void setBallPosition(){ball.center.x = x + 100 * cos(angle);ball.center.y = y + 100 * sin(angle);}};

在startup()中初始化背景、炮台等：

loadimage(&im_bk, _T("bk.jpg")); // 导入背景图片loadimage(&im_role, _T("role.jpg")); // 导入角色图片loadimage(&im_house, _T("house.jpg")); // 导入家图片cannon.im = im_role; // 炮台角色图片cannon.angle = 0; // 初始角度cannon.x = 500; // 中心坐标cannon.y = 350;cannon.ball.radius = Radius; // 炮台带的小球的半径cannon.ball.colorId = rand() % ColorNum; // 炮台小球颜色cannon.setBallPosition(); // 设置炮台小球的坐标

炮台旋转与更改小球颜色

为炮台类添加成员函数updateWithMouseMOVE()，实现炮台跟着鼠标旋转：

void updateWithMouseMOVE(int mx, int my){float xs = mx - x;float ys = my - y;float length = sqrt(xs * xs + ys * ys);if (length > 4){angle = atan2(-ys, xs);ball.center.x = x + 100 * xs / length;ball.center.y = y + 100 * ys / length;}}

添加成员函数updateWithButtonDown()，实现鼠标点击时，改变小球颜色：

void updateWithRButtonDown(){ball.colorId += 1;if (ball.colorId == ColorNum){ball.colorId = 0;}}

然后在updateWithInput()中调用即可

炮台发射小球

当点击鼠标左键时，炮台小球沿着朝向鼠标的射线方向进行移动。判断每帧移动后和balls中的所有小球是否相交，如果没有则继续移动；如果有则将炮台小球插入到当前位置：

if (e.message == WM_LBUTTONDOWN){cannon.updateWithMouseMOVE(e.x, e.y); // 先更新炮台旋转角度、小球坐标float vx = (cannon.ball.center.x - cannon.x) / 5; // 小球移动速度float vy = (cannon.ball.center.y - cannon.y) / 5;int isCollider = 0;while (isCollider == 0 && cannon.ball.center.y > 0 && cannon.ball.center.y < HEIGHT && cannon.ball.center.x > 0 && cannon.ball.center.x < WIDTH) // 没有碰撞和越界{cannon.ball.center.x += vx;cannon.ball.center.y += vy;show(); // 显示移动轨迹for (i = 0; i < balls.size(); i++){float distance = Distance(balls[i].center.x, balls[i].center.y, cannon.ball.center.x, cannon.ball.center.y);if (distance < Radius) // 找到与炮台小球碰撞的小球{isCollider = 1;cannon.updateWithMouseMOVE(e.x, e.y); // 恢复炮台小球位置Ball fireball = balls[i];fireball.colorId = cannon.ball.colorId;balls.insert(balls.begin() + i, fireball); // 复制一个小球插入int count = eraseSameColorBalls(i, fireball, path, balls);if (count == 0){for (j = i; j >= 0; j--){if (balls[j].indexInPath - balls[j + 1].indexInPath <= 0){balls[j].indexInPath = balls[j + 1].indexInPath + 2 * Radius / path.sampleInterval;}else{break;}}}return;}}}}

连续出球与胜负判断

定义全局变量gameStatus描述游戏状态，在show()中根据游戏状态显示对应文字：

setbkmode(TRANSPARENT);settextcolor(RGB(255, 0, 0));settextstyle(60, 0, _T("宋体"));if (gameStatus == 1){outtextxy(WIDTH * 0.35, HEIGHT * 0.35, _T("游戏胜利 :)"));}else if (gameStatus == -1){outtextxy(WIDTH * 0.35, HEIGHT * 0.35, _T("游戏失败 :("));}

每隔10秒产生一批小球。如果balls中没有小球且运行时间超过100秒，游戏胜利；如果有球跑到终点，游戏失败：

static clock_t start = clock(); // 第一次运行时刻clock_t now = clock(); // 当前时刻int nowSencond = (int(now - start) / CLOCKS_PER_SEC); // 程序目前运行了多少秒if (nowSencond % 10 == 0 && nowSencond <= 100 && gameStatus == 0) // 每隔10秒，新增一批小球{Ball ball;ball.initiate(path);balls.push_back(ball);}if (balls.size() == 0){if (nowSencond > 100){gameStatus = 1;}return;}if (balls[0].indexInPath >= path.allPoints.size() - 1) // 第一个求到了终点，游戏失败{gameStatus = -1;return;}

添加音效

在startup()中循环播放背景音乐：

mciSendString(_T("open game_music.mp3 alias bkmusic"), NULL, 0, NULL);//打开背景音乐mciSendString(_T("play bkmusic repeat"), NULL, 0, NULL); // 循环播放

在updateWithInput()中，消除小球时播放一次消除音效：

if (count >= 3)PlayMusicOnce((TCHAR*)_T("coin.mp3")); // 播放一次金币音效

添加复杂轨道

path.keyPoints.push_back(Point(50, 300));path.keyPoints.push_back(Point(50, 600));path.keyPoints.push_back(Point(100, 650));path.keyPoints.push_back(Point(700, 650));path.keyPoints.push_back(Point(700, 550));path.keyPoints.push_back(Point(250, 550));path.keyPoints.push_back(Point(200, 500));path.keyPoints.push_back(Point(200, 200));path.keyPoints.push_back(Point(250, 150));path.keyPoints.push_back(Point(800, 150));path.keyPoints.push_back(Point(850, 200));path.keyPoints.push_back(Point(850, 650));path.keyPoints.push_back(Point(950, 650));path.keyPoints.push_back(Point(950, 100));path.keyPoints.push_back(Point(900, 50));path.keyPoints.push_back(Point(150, 50));

最后对轨道做一些美化：

完整代码

#include <graphics.h>#include <conio.h>#include <time.h>#include <vector>#include <algorithm>#pragma comment(lib, "Winmm.lib")using namespace std;#define WIDTH 1000#define HEIGHT 700#define Radius 25#define ColorNum 5COLORREF colors[ColorNum] = { RED, BLUE, GREEN, YELLOW, MAGENTA };float Distance(float x1, float y1, float x2, float y2){float xd = x1 - x2;float yd = y1 - y2;float length = sqrt(xd * xd + yd * yd);return length;}void sleep(DWORD ms) // 精确延时函数{static DWORD oldtime = GetTickCount();while (GetTickCount() - oldtime < ms){Sleep(1);}oldtime = GetTickCount();}void PlayMusicOnce(TCHAR fileName[80]){TCHAR cmdString1[50];swprintf_s(cmdString1, _T("open %s alias tmpmusic"), fileName); // 生成命令字符串mciSendString(_T("close tmpmusic"), NULL, 0, NULL); // 先把前面一次的音乐关闭mciSendString(cmdString1, NULL, 0, NULL); // 打开音乐mciSendString(_T("play tmpmusic"), NULL, 0, NULL); // 仅播放一次}class Point{public:float x, y;Point(){}Point(float ix, float iy){x = ix;y = iy;}};class Path{public:vector<Point> keyPoints;float sampleInterval; // 采样间隔vector<Point> allPoints; // 所有采样得到的点void getAllPoints(){int i;for (i = 0; i < keyPoints.size() - 1; i++){float xd = keyPoints[i + 1].x - keyPoints[i].x;float yd = keyPoints[i + 1].y - keyPoints[i].y;float length = sqrt(xd * xd + yd * yd);int num = length / sampleInterval;for (int j = 0; j < num; j++){float x_sample = keyPoints[i].x + j * xd / num;float y_sample = keyPoints[i].y + j * yd / num;allPoints.push_back(Point(x_sample, y_sample));}}allPoints.push_back(Point(keyPoints[i].x, keyPoints[i].y)); // 最后一个关键点}void draw(){setlinecolor(RGB(0, 0, 0));setfillcolor(RGB(0, 0, 0));for (int i = 0; i < keyPoints.size() - 1; i++) // 将关键点依次连接形成多条线段{line(keyPoints[i].x, keyPoints[i].y, keyPoints[i + 1].x, keyPoints[i + 1].y);}for (int i = 0; i < allPoints.size(); i++) // 在所有采样点处画一个小圆点{fillcircle(allPoints[i].x, allPoints[i].y, 2);}}~Path(){keyPoints.clear();allPoints.clear();}};class Ball{public:Point center;float radius;int colorId;int indexInPath; // 小球位置在Path的allPoints中的对应序号int direction;void draw(){setlinecolor(colors[colorId]);setfillcolor(colors[colorId]);fillcircle(center.x, center.y, radius);}void movetoIndexPath(Path path){center = path.allPoints[indexInPath];}void initiate(Path path){radius = Radius;indexInPath = 0;direction = 0;movetoIndexPath(path);colorId = rand() % ColorNum;}void changeIndexbyDirection(Path path){if (direction == 1 && indexInPath + 1 < path.allPoints.size()){indexInPath++;}else if (direction == -1 && indexInPath - 1 >= 0){indexInPath--;}}};class Cannon{public:IMAGE im;IMAGE im_rotate;float x, y;Ball ball; // 炮台自带的小球float angle;void draw(){rotateimage(&im_rotate, &im, angle, RGB(160, 211, 255), false, false);putimage(x - im.getwidth() / 2, y - im.getheight() / 2, &im_rotate);ball.draw();}void setBallPosition(){ball.center.x = x + 100 * cos(angle);ball.center.y = y + 100 * sin(angle);}void updateWithMouseMOVE(int mx, int my){float xs = mx - x;float ys = my - y;float length = sqrt(xs * xs + ys * ys);if (length > 4){angle = atan2(-ys, xs);ball.center.x = x + 100 * xs / length;ball.center.y = y + 100 * ys / length;}}void updateWithRButtonDown(){ball.colorId += 1;if (ball.colorId == ColorNum){ball.colorId = 0;}}};int eraseSameColorBalls(int i, Ball fireball, Path& path, vector<Ball>& balls){vector<int> sameColorIndexes; // 记录与插入小球颜色一样的序号int forward = i;int backward = i;sameColorIndexes.push_back(i);while (forward > 0 && balls[forward].colorId == fireball.colorId) // 向终点方向寻找{sameColorIndexes.push_back(forward);if (balls[forward - 1].indexInPath - balls[forward].indexInPath > 2 * Radius / path.sampleInterval){break;}forward--;}if (forward == 0 && balls[0].colorId == fireball.colorId) // 临界情况{sameColorIndexes.push_back(forward);}while (backward < balls.size() - 1 && balls[backward].colorId == fireball.colorId) // 向起点方向寻找{sameColorIndexes.push_back(backward);if (balls[backward].indexInPath - balls[backward + 1].indexInPath > 2 * Radius / path.sampleInterval){break;}backward++;}if (backward == balls.size() - 1 && balls[balls.size() - 1].colorId == fireball.colorId){sameColorIndexes.push_back(backward);}sort(sameColorIndexes.begin(), sameColorIndexes.end());vector<int>::iterator ite = unique(sameColorIndexes.begin(), sameColorIndexes.end()); // 去重sameColorIndexes.erase(ite, sameColorIndexes.end());int NumSameColors = sameColorIndexes.size();if (NumSameColors >= 3){int minIndex = sameColorIndexes[0];int maxIndex = sameColorIndexes[NumSameColors - 1];balls.erase(balls.begin() + minIndex, balls.begin() + maxIndex + 1); // 删除同颜色小球return NumSameColors;}return 0;}Path path;vector<Ball> balls;IMAGE im_role, im_house, im_bk; // 一些图片Cannon cannon; // 定义炮台对象int gameStatus = 0;void startup(){mciSendString(_T("open game_music.mp3 alias bkmusic"), NULL, 0, NULL);//打开背景音乐mciSendString(_T("play bkmusic repeat"), NULL, 0, NULL); // 循环播放srand(time(0));initgraph(WIDTH, HEIGHT);cleardevice();loadimage(&im_bk, _T("bk.jpg")); // 导入背景图片loadimage(&im_role, _T("role.jpg")); // 导入角色图片loadimage(&im_house, _T("house.jpg")); // 导入家图片path.keyPoints.push_back(Point(50, 300));path.keyPoints.push_back(Point(50, 600));path.keyPoints.push_back(Point(100, 650));path.keyPoints.push_back(Point(700, 650));path.keyPoints.push_back(Point(700, 550));path.keyPoints.push_back(Point(250, 550));path.keyPoints.push_back(Point(200, 500));path.keyPoints.push_back(Point(200, 200));path.keyPoints.push_back(Point(250, 150));path.keyPoints.push_back(Point(800, 150));path.keyPoints.push_back(Point(850, 200));path.keyPoints.push_back(Point(850, 650));path.keyPoints.push_back(Point(950, 650));path.keyPoints.push_back(Point(950, 100));path.keyPoints.push_back(Point(900, 50));path.keyPoints.push_back(Point(150, 50));path.sampleInterval = Radius / 5;path.getAllPoints();cannon.im = im_role; // 炮台角色图片cannon.angle = 0; // 初始角度cannon.x = 500; // 中心坐标cannon.y = 350;cannon.ball.radius = Radius; // 炮台带的小球的半径cannon.ball.colorId = rand() % ColorNum; // 炮台小球颜色cannon.setBallPosition(); // 设置炮台小球的坐标for (int i = 15; i >= 10; i--){Ball ball;ball.initiate(path);ball.indexInPath = i * (2 * ball.radius / path.sampleInterval);ball.movetoIndexPath(path);balls.push_back(ball);}for (int i = 5; i >= 0; i--){Ball ball;ball.initiate(path);ball.indexInPath = i * (2 * ball.radius / path.sampleInterval);ball.movetoIndexPath(path);balls.push_back(ball);}BeginBatchDraw();}void show(){putimage(0, 0, &im_bk); // 显示背景图片putimage(30, 10, &im_house); // 显示房子图片//path.draw();cannon.draw();for (int i = 0; i < balls.size(); i++){balls[i].draw();}setbkmode(TRANSPARENT);settextcolor(RGB(255, 0, 0));settextstyle(60, 0, _T("宋体"));if (gameStatus == 1){outtextxy(WIDTH * 0.35, HEIGHT * 0.35, _T("游戏胜利 :)"));}else if (gameStatus == -1){outtextxy(WIDTH * 0.35, HEIGHT * 0.35, _T("游戏失败 :("));}FlushBatchDraw();}void updateWithoutInput(){static clock_t start = clock(); // 第一次运行时刻clock_t now = clock(); // 当前时刻int nowSencond = (int(now - start) / CLOCKS_PER_SEC); // 程序目前运行了多少秒if (nowSencond % 10 == 0 && nowSencond <= 100 && gameStatus == 0) // 每隔10秒，新增一批小球{Ball ball;ball.initiate(path);balls.push_back(ball);}if (balls.size() == 0){if (nowSencond > 100){gameStatus = 1;}return;}if (balls[0].indexInPath >= path.allPoints.size() - 1) // 第一个求到了终点，游戏失败{gameStatus = -1;return;}int i;for (i = 0; i < balls.size(); i++){balls[i].direction = 0;}i = balls.size() - 1; // 最后一个小球balls[i].direction = 1; // 最后一个小球向前运动while (i > 0){if (balls[i - 1].indexInPath - balls[i].indexInPath <= 2 * Radius / path.sampleInterval) // 前后两个小球相切{balls[i - 1].direction = 1;balls[i - 1].indexInPath = balls[i].indexInPath + 2 * Radius / path.sampleInterval;i--;}else{break;}}for (int i = 0; i < balls.size(); i++) // 小球根据direction更新位置{balls[i].movetoIndexPath(path);balls[i].changeIndexbyDirection(path);}Sleep(50);}void updateWithInput(){if (gameStatus != 0){return;}int i, j;ExMessage e;while (peekmessage(&e)){if (e.message == WM_MOUSEMOVE){cannon.updateWithMouseMOVE(e.x, e.y);}else if (e.message == WM_RBUTTONDOWN){cannon.updateWithRButtonDown();}else if (e.message == WM_LBUTTONDOWN){cannon.updateWithMouseMOVE(e.x, e.y); // 先更新炮台旋转角度、小球坐标float vx = (cannon.ball.center.x - cannon.x) / 5; // 小球移动速度float vy = (cannon.ball.center.y - cannon.y) / 5;int isCollider = 0;while (isCollider == 0 && cannon.ball.center.y > 0 && cannon.ball.center.y < HEIGHT && cannon.ball.center.x > 0 && cannon.ball.center.x < WIDTH) // 没有碰撞和越界{cannon.ball.center.x += vx;cannon.ball.center.y += vy;show(); // 显示移动轨迹for (i = 0; i < balls.size(); i++){float distance = Distance(balls[i].center.x, balls[i].center.y, cannon.ball.center.x, cannon.ball.center.y);if (distance < Radius) // 找到与炮台小球碰撞的小球{isCollider = 1;cannon.updateWithMouseMOVE(e.x, e.y); // 恢复炮台小球位置Ball fireball = balls[i];fireball.colorId = cannon.ball.colorId;balls.insert(balls.begin() + i, fireball); // 复制一个小球插入int count = eraseSameColorBalls(i, fireball, path, balls);if (count >= 3){PlayMusicOnce((TCHAR*)_T("coin.mp3")); // 播放一次金币音效}if (count == 0){for (j = i; j >= 0; j--){if (balls[j].indexInPath - balls[j + 1].indexInPath <= 0){balls[j].indexInPath = balls[j + 1].indexInPath + 2 * Radius / path.sampleInterval;}else{break;}}}return;}}}}}}void gameover(){balls.clear();}int main(){startup();while (1){show();updateWithoutInput();updateWithInput();}gameover();return 0;}