C语言图形库函数

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1、1.初始化图形系统 函数名:initgraph功 能:初始化图形系统用 法:voidfarinitgraph(intfar*graphdriver,intfar*graphmode,   charfar*pathtodriver);程序例:#include#include#include#includeintmain(void){  /*requestautodetection*/  intgdriver=DETECT,gmode,errorcode;  /*initializegraphicsmode*/ 

2、 initgraph(&gdriver,&gmode,"");  /*readresultofinitialization*/  errorcode=graphresult();  if(errorcode!=grOk) /*anerroroccurred*/  {     printf("Graphicserror:%s",grapherrormsg(errorcode));     printf("Pressanykeytohalt:");     getch();     exit(1);            /*returnwitherrorcode*/  }  /*dra

3、waline*/  line(0,0,getmaxx(),getmaxy());  /*cleanup*/  getch();  closegraph();  return0;}  2. 函数名:drawpoly功 能:画多边形用 法:voidfardrawpoly(intnumpoints,intfar*polypoints);程序例:#include#include#include#includeintmain(void){  /*requestautodetection*/  intgdriver=DE

4、TECT,gmode,errorcode;  intmaxx,maxy;  /*ourpolygonarray*/  intpoly[10];  /*initializegraphicsandlocal     variables*/  initgraph(&gdriver,&gmode,"");  /*readresultofinitialization*/  errorcode=graphresult();  if(errorcode!=grOk)  /*anerroroccurred*/  {     printf("Graphicserror:%s",     graphe

5、rrormsg(errorcode));     printf("Pressanykeytohalt:");     getch();  /*terminatewithanerrorcode*/     exit(1);  }  maxx=getmaxx();  maxy=getmaxy();  poly[0]=20;       /*1stvertext*/  poly[1]=maxy/2;  poly[2]=maxx-20;/*2nd*/  poly[3]=20;  poly[4]=maxx-50;/*3rd*/  poly[5]=maxy-20;  poly[6]=maxx/2; 

6、/*4th*/  poly[7]=maxy/2;/*  drawpolydoesn'tautomaticallyclose  thepolygon,sowecloseit.*/  poly[8]=poly[0];  poly[9]=poly[1];  /*drawthepolygon*/  drawpoly(5,poly);  /*cleanup*/  getch();  closegraph();  return0;}   函数名:ellipse功 能:画一椭圆用 法:voidfarellipse(intx,inty,intstangle,intendangle,   intxrad

7、ius,intyradius);程序例:#include#include#include#includeintmain(void){  /*requestautodetection*/  intgdriver=DETECT,gmode,errorcode;  intmidx,midy;  intstangle=0,endangle=360;  intxr