小球碰撞弹回操作
1 #include <graphics.h> 2 #include <conio.h> 3 #include <time.h> 4 5 int main(){ 6 srand((unsigned)time(NULL)); 7 initgraph(640, 480); 8 9 //int x = 21, y = 21; 10 int x = rand() % 598 + 21; 11 int y = rand() % 438 + 21; 12 13 //int a = 1, b = 1; 14 int a = rand() % 5 + 1; 15 int b = rand() % 5 + 1; 16 while (1){ 17 18 cleardevice(); 19 BeginBatchDraw(); 20 setcolor(GREEN); 21 setfillcolor(GREEN); 22 fillcircle(x, y, 20); 23 // 边界判定 24 if (x < 20 || x > 620){ 25 a *= -1; 26 } 27 if (y < 20 || y > 460){ 28 b *= -1; 29 } 30 31 x += a; 32 y += b; 33 Sleep(10); 34 EndBatchDraw(); 35 } 36 37 closegraph(); 38 return 0; 39 }
// 在640 * 480 内随机一个位置产生一个小球 ,
碰到边框弹回
成功没有捷径,一步一个脚印!