执行 link.exe 时出错（贴源码）
#include <iostream>#include <fstream>
#include <cmath>
#include <iomanip>
#include <afxwin.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glaux.h>
#include <afx.h>
using namespace std;
//声明绘图函数
void myinit(void);//设置视口
void DrawMyObjects(void);//画点和线
void CALLBACK myReshape(GLsizei w,GLsizei h);//窗口改变后刷新
void CALLBACK display(void);
typedef struct Point
{ double x;
double y;
int num; //记录原始点号
} Point;
int iTotalNum; //点集中总点数
Point *que; // 保存凸包结点，que为一个栈
Point *p; //存储平面点集
int top; // 记录栈顶位置
//读取点坐标
void ReadData()
{ ifstream in("D:\\t.dat");
in >> iTotalNum;
p = new Point[iTotalNum]; //循环读入平面点坐标数据 que = new Point[iTotalNum];
double tt;
int i;
for (i=0; i<iTotalNum; ++i)
{ int j = i+1;
in >> j >> p[i].x >> p[i].y >> tt;
p[i].num = i+1;
} in.close(); //关闭文件
}
double dis(Point a, Point b) // 求a, b两点距离
{ double distance;
distance = sqrt(((a.x-b.x)*(a.x-b.x) + (a.y-b.y)*(a.y-b.y)));
return distance; }
// 求P1P0与P2P0的叉积
//叉积,如果l>0,则说明直线P0P2在P0P1的逆时针方向
//判断左转，l>0，就做左转
double left(Point p2,Point p1, Point p0)
{ double l;
l = (p1.x-p0.x)*(p2.y-p0.y)-(p2.x-p0.x)*(p1.y-p0.y);
return l; }
// 用GrahamScan求凸包
void GrahamScan(int n)
{ Point tmp;
int k = 0;
int i;
//[1]找出y值(y值相同时找x最小)最小的点作为起始点P0
for(i=1; i<n; ++i)
if((p[i].y < p[k].y) || ((p[i].y==p[k].y) && (p[i].x<p[k].x)))
k = i;
tmp = p[0]; p[0] = p[k]; p[k] = tmp;
// [2] 按极角大小逆时针排序，大于0时，p2在p1上面
for( i=1; i<n; ++i)
{ k = i;
for(int j=i+1; j<n; ++j)
{ if((left(p[j], p[k], p[0]) < 0) //j在k下面时才要互换
|| (left(p[j], p[k], p[0])==0 && dis(p[0], p[j])<dis(p[0], p[k])))
k = j; }
tmp = p[i]; p[i] = p[k]; p[k] = tmp; }
cout<<"按极角大小逆时针排序结果："<<endl;
cout<<"起始点号:"<<"NO."<<p[0].num<<endl;
for( i=1; i<n; i++)
{ cout<<"第"<<i<<"个点:"<<"NO."<<p[i].num<<"\t";
} cout<<endl;
// [3] 把极角最小的0, 1, 2三点存入栈中
for(i = 0; i <= 2; ++i)
que[i] = p[i];
top = 2;
// [4] 从第3点开始判断左转，直到最后，若不左转则退栈
for(i=3; i<n; i++)
{ while((left(p[i],que[top],que[top-1]))<=0)
//<0时不做左转，退栈
top--; que[++top]=p[i]; }
top++;
//显示结果
cout<<endl;
cout<<"构成凸包点坐标："<<endl;
for(i=0; i<top; i++)
{ cout<<i+1<<": "<<"NO."<<p[i].num<<"\t"<<"坐标："<<setprecision(10)<<que[i].x<<" "<<setprecision(10)<<que[i].y<<endl; }
}
//GL绘图
void myinit(void)
{ glClearColor(1.0,1.0,0.0,0.0);
glClear(GL_COLOR_BUFFER_BIT);
glShadeModel(GL_FLAT); }
void CALLBACK myReshape(GLsizei w,GLsizei h)
{ glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if(w<=h) //glOrtho(左，右，下，上，近，远)
glOrtho(0.0,800.0,0.0*(GLfloat)h/(GLfloat)w,
600.0*(GLfloat)h/(GLfloat)w,-50.0,50.0);
glOrtho(0.0*(GLfloat)w/(GLfloat)h, 800.0*(GLfloat)w/(GLfloat)h,0.0,600.0,-50.0,50.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void CALLBACK display(void)
{ glClearColor(1.0,1.0,0.0,0.0);
glClear(GL_COLOR_BUFFER_BIT);
DrawMyObjects(); //画图函数
glFlush(); }
void DrawMyObjects(void)
{ glBegin(GL_POINTS); //画点
glColor3f(1.0,0.0,0.0);
for(int i=0; i<iTotalNum; i++)
{ glVertex2d(p[i].x-492050,p[i].y-2639990);
} glEnd();
glBegin(GL_LINE_LOOP); //画线
for(i=0; i<top; i++)
{ glVertex2d(que[i].x-492050,que[i].y-2639990);
} glEnd();
glBegin(GL_TRIANGLES); //凸包点三角号加重处理
glColor3f(0.5,0.5,0.5);
for(i =0; i<top; i++)
{ glVertex2d(que[i].x-7830+0.4,que[i].y-7520-0.36);
glVertex2d(que[i].x-7830,que[i].y-7520+0.46);
glVertex2d(que[i].x-7830-0.4,que[i].y-7520-0.36); } glEnd();
}
int main()
{ ReadData();
GrahamScan(iTotalNum);
auxInitDisplayMode(AUX_SINGLE|AUX_RGBA);
auxInitPosition(80,80,910,640 );
auxInitWindow("凸包示意图");
myinit();
auxReshapeFunc(myReshape);
auxMainLoop(display);
_sleep(6000);
return 0;
}
--------------------Configuration: 1111 - Win32 Debug--------------------
Linking...
nafxcwd.lib(afxmem.obj) : error LNK2005: "void __cdecl operator delete(void *)" (??3@YAXPAX@Z) already defined in libcpd.lib(delop.obj)
1111.obj : error LNK2001: unresolved external symbol __imp__glShadeModel@4
1111.obj : error LNK2001: unresolved external symbol __imp__glClear@4
1111.obj : error LNK2001: unresolved external symbol __imp__glClearColor@16
1111.obj : error LNK2001: unresolved external symbol __imp__glOrtho@48
1111.obj : error LNK2001: unresolved external symbol __imp__glLoadIdentity@0
1111.obj : error LNK2001: unresolved external symbol __imp__glMatrixMode@4
1111.obj : error LNK2001: unresolved external symbol __imp__glViewport@16
1111.obj : error LNK2001: unresolved external symbol __imp__glFlush@0
1111.obj : error LNK2001: unresolved external symbol __imp__glEnd@0
1111.obj : error LNK2001: unresolved external symbol __imp__glVertex2d@16
1111.obj : error LNK2001: unresolved external symbol __imp__glColor3f@12
1111.obj : error LNK2001: unresolved external symbol __imp__glBegin@4
1111.obj : error LNK2001: unresolved external symbol _auxMainLoop@4
1111.obj : error LNK2001: unresolved external symbol _auxReshapeFunc@4
1111.obj : error LNK2001: unresolved external symbol _auxInitWindowA@4
1111.obj : error LNK2001: unresolved external symbol _auxInitPosition@16
1111.obj : error LNK2001: unresolved external symbol _auxInitDisplayMode@4
nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __endthreadex
nafxcwd.lib(thrdcore.obj) : error LNK2001: unresolved external symbol __beginthreadex
Debug/1111.exe : fatal error LNK1120: 19 unresolved externals
执行 link.exe 时出错.
1111.exe - 1 error(s), 0 warning(s)
