easyx图形库基础：3实现弹球小游戏

一.实现弹球小游戏:

1.初始化布：

int main()
{initgraph(800, 600);setorigin(400, 300);setaspectratio(1, -1);setbkcolor(RGB(188, 227, 245));cleardevice();getchar();closegraph();
}

画面效果：

2.初始化一个球的信息：

1.球的中心点坐标，球的半径，
2.球的实际速度，水平竖直的分量速度。
3.球的颜色。
4.定义一个结构体去保存这些数值。

#define radius 30typedef struct ball {double x, y;double v, vx, vy;int radius;COLORREF colour;
}Ba;

//初始化球：
void InitBall(Ba* ball)
{//在一个范围内随机生成一个球，数值全部都是随机的ball->x = ((rand() % 301) - 150);//[-150,150]ball->y = ((rand() % 201) - 100);//生成随机速度ball->v = (rand() % 6)+3;//[3,8];//生成随机的角度：int thead = rand() % 360;//定义水平竖直的速度：ball->vx = ball->v *cos((double)thead);ball->vy = ball->v *sin((double)thead);//初始化颜色；ball->colour = GREEN;
}

3.球的移动和碰撞反弹

//球的移动和碰撞反弹
void CrashBall(Ba* ball)
{while (1){cleardevice();//设置颜色绘制球；setfillcolor(ball->colour);fillcircle(ball->x, ball->y,radius);Sleep(40);//球的移动(ball->x) += (ball->vx);(ball->y) += (ball->vy);//判断球是否到墙壁;//不考虑底边是否存在挡板的情况；if ((ball->x >= 400 - radius) || (ball->x <= -400 + radius)){ball->vx = (-(ball->vx));}if ((ball->y >= 300 - radius) || (ball->y <= -300 + radius)){ball->vy = (-(ball->vy));}}
}

4.底边挡板的绘制和移动碰撞重置数据。

void CrashBall(Ba* ball)
{int left, top, right, bottom;left = -100, top = -270;right = 100, bottom = -300;while (1){cleardevice();//设置颜色绘制球；setfillcolor(ball->colour);fillcircle(ball->x, ball->y,radius);//绘制挡板setfillcolor(RGB(113, 187, 234));//挡板不可以出界fillrectangle(left, top, right, bottom);Sleep(40);//球的移动(ball->x) += (ball->vx);(ball->y) += (ball->vy);//控制挡板移动if (_kbhit()){char ch = _getch();switch (ch){case 'a':case 'A':if (left < -400)break;left -= 5;right -= 5;break;case 'd':case 'D':if (right > 400)break;left += 5;right += 5;break;}}//判断球是否到墙壁;//不考虑底边是否存在挡板的情况；if ((ball->x >= 400 - radius) || (ball->x <= -400 + radius)){ball->vx = (-(ball->vx));}if ((ball->y >= 300 - radius)){ball->vy = (-(ball->vy));}//撞到挡板if ((ball->x >= left) && (ball->x <= right)){if (ball->y <= -240)ball->vy = (-(ball->vy));}//判断出界if ((ball->x < left) || (ball->x > right)){if (ball->y < -300){InitBall(ball);left = -100, top = -270;right = 100, bottom = -300;}}}
}

二.整体代码：

#define _CRT_SECURE_NO_WARNINGS 1#include<stdio.h>
#include<easyx.h>
#include<conio.h>
#include<time.h>
#include<math.h>
#include<stdbool.h>#define radius 30
#define move 10typedef struct ball {double x, y;double v, vx, vy;COLORREF colour;
}Ba;//初始化球：
void InitBall(Ba* ball)
{//在一个范围内随机生成一个球，数值全部都是随机的ball->x = ((rand() % 301) - 150);//[-150,150]ball->y = ((rand() % 201) - 100);//生成随机速度ball->v = (rand() % 6) + 5;//[5,11];//生成随机的角度：int thead = rand() % 360;//定义水平竖直的速度：ball->vx = (ball->v) * cos((double)thead);ball->vy = (ball->v) * sin((double)thead);//初始化颜色；ball->colour = GREEN;
}//球的移动和碰撞反弹void CrashBall(Ba* ball)
{int left, top, right, bottom;left = -100, top = -270;right = 100, bottom = -300;while (1){cleardevice();//设置颜色绘制球；setfillcolor(ball->colour);fillcircle(ball->x, ball->y,radius);//绘制挡板setfillcolor(RGB(113, 187, 234));//挡板不可以出界fillrectangle(left, top, right, bottom);Sleep(40);//球的移动(ball->x) += (ball->vx);(ball->y) += (ball->vy);//控制挡板移动if (_kbhit()){char ch = _getch();switch (ch){case 'a':case 'A':if (left < -400)break;left -= 5;right -= 5;break;case 'd':case 'D':if (right > 400)break;left += 5;right += 5;break;}}//判断球是否到墙壁;//不考虑底边是否存在挡板的情况；if ((ball->x >= 400 - radius) || (ball->x <= -400 + radius)){ball->vx = (-(ball->vx));}if ((ball->y >= 300 - radius)){ball->vy = (-(ball->vy));}//撞到挡板if ((ball->x >= left) && (ball->x <= right)){if (ball->y <= -240)ball->vy = (-(ball->vy));}//判断出界if ((ball->x < left) || (ball->x > right)){if (ball->y < -300){InitBall(ball);left = -100, top = -270;right = 100, bottom = -300;}}}
}int main()
{initgraph(800, 600);setorigin(400, 300);setaspectratio(1, -1);setbkcolor(RGB(188, 227, 245));cleardevice();//获取当前时间作为随机数种子；srand((unsigned int)time(NULL));//定义变量Ba ball;//初始化球：InitBall(&ball);//球的移动和碰撞反弹CrashBall(&ball);getchar();closegraph();
}