CAD时钟生成，C语言实现

代码如下：

#include<STDIO.H>#include<STDLIB.H>#include<MATH.H>#define PI 3.14159265359void DrawCircle(FILE* fp,double x,double y,double radius){fprintf(fp,"0 \nSECTION\n");fprintf(fp,"2 \nENTITIES\n");fprintf(fp,"0 \nCIRCLE\n");fprintf(fp,"8 \n0\n");fprintf(fp,"10 \n%f\n",0.0);fprintf(fp,"20 \n%f\n",0.0);fprintf(fp,"40 \n%f\n",radius);fprintf(fp,"62 \n1\n");//设置为红色//圆形绘制结束for (int i=0;i<12;i++){fprintf(fp,"0 \nLINE\n");fprintf(fp,"8 \n0\n");fprintf(fp,"10 \n%f\n20 \n%f\n11 \n%f\n21 \n%f\n 62\n 1\n",radius*0.8*cos(i*PI/6.0),radius*0.8*sin(i*PI/6.0),radius*cos(i*PI/6.0),radius*sin(i*PI/6.0));}}//绘图顺序为先画时针，再画分针，为第二题准备void DrawHands(FILE* fp,double hourangle,double minuteangle,double radius){fprintf(fp,"0 \nLINE\n");fprintf(fp,"8 \n0\n");fprintf(fp,"10 \n%f\n20 \n%f\n11 \n%f\n21 \n%f\n 62 \n3\n",0.0,0.0,radius*0.4*cos(hourangle),radius*0.4*sin(hourangle));//画时针fprintf(fp,"0 \nLINE\n");fprintf(fp,"8 \n0\n");fprintf(fp,"10 \n%f\n20 \n%f\n11 \n%f\n21 \n%f\n 62 \n3\n",0.0,0.0,radius*0.6*cos(minuteangle),radius*0.6*sin(minuteangle));//画分针}int main(){double hour,minute,r;double hour_angle,minute_angle;FILE* fp;fp=fopen("Circle.dxf","w");if (fp==NULL){printf("Can not open this file !\n");return 0;}while(1){printf("请输入表盘的直径R:");scanf("%lf",&r);printf("请输入时间(Hour Minut):");scanf("%lf %lf",&hour,&minute);//依次输入，用空格隔开。默认输入为10:30，用来与第二题作比较if (hour>23||minute>59){printf("输入错误，请重新输入!\n");} else{break;}}minute_angle=(90.0-minute*6.0)*PI/180.0;hour_angle=(90.0-(hour+minute/60.0)*30.0)*PI/180.0;DrawCircle(fp,hour_angle,minute_angle,r);DrawHands(fp,hour_angle,minute_angle,r);fprintf(fp,"0 \nENDSEC\n");fprintf(fp,"0 \nEOF");fclose(fp);return 0;}