//反彈球之間相互碰撞，碰撞為理想的彈性碰撞，兩球相撞之后交換速度 #include <graphics.h> #include <conio.h> #include <stdlib.h> #include <math.h> #define high 480 #define width 640 #define ballnum 15int main() {float ball_x[ballnum],ball_y[ballnum];float ball_vx[ballnum],ball_vy[ballnum];float radius;int i,j;radius=20;for(i=0;i<ballnum;i++){ball_x[i]=rand()%int (width-4*radius)+2*radius;ball_y[i]=rand()%int (high-4*radius)+2*radius;ball_vx[i]=(rand()%2)*2-1;ball_vy[i]=(rand()%2)*2-1;}initgraph(width,high);BeginBatchDraw();while(1){setcolor(BLACK);setfillcolor(BLACK);for(i=0;i<ballnum;i++){fillcircle(ball_x[i],ball_y[i],radius);}for(i=0;i<ballnum;i++){ball_x[i]=ball_x[i]+ball_vx[i];ball_y[i]=ball_y[i]+ball_vy[i];if(ball_x[i]<radius)ball_x[i]=radius;if(ball_y[i]<radius)ball_y[i]=radius;if(ball_x[i]>width-radius)ball_x[i]=width-radius;if(ball_y[i]>high-radius)ball_y[i]=high-radius;}//判斷是否和墻壁碰撞for(i=0;i<ballnum;i++){if((ball_x[i]<=radius)||(ball_x[i]>=width-radius))ball_vx[i]=-ball_vx[i];if((ball_y[i]<=radius)||(ball_y[i]>=high-radius))ball_vy[i]=-ball_vy[i];}float mindistance2[ballnum][2]; //記錄某個小球和與它最近小球的距離，以及這個小球的下標for(i=0;i<ballnum;i++){mindistance2[i][0]=999999;mindistance2[i][1]=-1;}//求所有小球兩兩之間的距離的平方for(i=0;i<ballnum;i++){for(j=0;j<ballnum;j++){if(i!=j) //不需要和自己比{float dist2;dist2=(ball_x[i]-ball_x[j])*(ball_x[i]-ball_x[j])+(ball_y[i]-ball_y[j])*(ball_y[i]-ball_y[j]);if(dist2<mindistance2[i][0]){mindistance2[i][0]=dist2;mindistance2[i][1]=j;}}}}//判斷球之間是否碰撞for(i=0;i<ballnum;i++){if(mindistance2[i][0]<=4*radius*radius)//若最小距離小于閥值，發(fā)生碰撞{j=mindistance2[i][1];int temp;temp=ball_vx[i];ball_vx[i]=ball_vx[j];ball_vx[j]=temp;temp=ball_vy[i];ball_vy[i]=ball_vy[j];ball_vy[j]=temp;mindistance2[j][0]=9999999; //避免交換兩次速度mindistance2[j][1]=-1;}}setcolor(YELLOW);setfillcolor(GREEN);for(i=0;i<ballnum;i++)fillcircle(ball_x[i],ball_y[i],radius);FlushBatchDraw();sleep(3);}EndBatchDraw;closegraph();return 0; }

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