构造一个函数，是在startPoint,endPoint间画一条带箭头的线段：
void CTry1View::DrawLine(POINT startPoint, POINT endPoint)
{
CClientDC dc(this);
dc.MoveTo(startPoint);
dc.LineTo(endPoint);double PI = 3.1415926;
double t=PI/4; //箭头与直线夹角
double l=0.2; //箭头边长度占直线长度的百分比

POINT arrowPoint;arrowPoint.x = (int)(l*((startPoint.x-endPoint.x)*cos(t)-(startPoint.y-endPoint.y)*sin(t))+endPoint.x);
arrowPoint.y = (int)(l*((startPoint.x-endPoint.x)*sin(t)+(startPoint.y-endPoint.y)*cos(t))+endPoint.y);
dc.MoveTo(endPoint);
dc.LineTo(arrowPoint);arrowPoint.x = (int)(l*((startPoint.x-endPoint.x)*cos(-t)-(startPoint.y-endPoint.y)*sin(-t))+endPoint.x);
arrowPoint.y = (int)(l*((startPoint.x-endPoint.x)*sin(-t)+(startPoint.y-endPoint.y)*cos(-t))+endPoint.y);
dc.MoveTo(endPoint);
dc.LineTo(arrowPoint);
}

#include "stdafx.h"
#include "LineArrow.h"

CLineArrow::CLineArrow(void)
{
}

CLineArrow::~CLineArrow(void)
{
}

void CLineArrow::DrawDashedLineArrow(CDC* pDC)
{
CPen pen;
pen.CreatePen(PS_DASH,1,RGB(0,0,0));//笔刷类型，像素宽，笔刷颜色

}

void CLineArrow::DrawInheritLine(CDC* pDC)
{
double PI = 3.1415926;
double t = PI / 4;
double l = 0.2;

CPoint arrowlftPoint;
arrowlftPoint.x = (int)(l*((m_start.x-m_end.x)*cos(t)-(m_start.y-m_end.y)*sin(t))+m_end.x);
arrowlftPoint.y = (int)(l*((m_start.x-m_end.x)*sin(t)+(m_start.y-m_end.y)*cos(t))+m_end.y);

CPoint arrowRtPoint;
arrowRtPoint.x = (int)(l*((m_start.x-m_end.x)*cos(-t)-(m_start.y-m_end.y)*sin(-t))+m_end.x);
arrowRtPoint.y = (int)(l*((m_start.x-m_end.x)*sin(-t)+(m_start.y-m_end.y)*cos(-t))+m_end.y);

CPoint end;
end.x = (arrowlftPoint.x + arrowRtPoint.x) / 2;
end.y = (arrowlftPoint.y + arrowRtPoint.y) / 2;

pDC->MoveTo(m_start);
pDC->LineTo(end);

pDC->MoveTo(m_end);
pDC->LineTo(arrowlftPoint);

pDC->MoveTo(m_end);
pDC->LineTo(arrowRtPoint);

pDC->MoveTo(arrowlftPoint);
pDC->LineTo(arrowRtPoint);
}

BOOL   CreateFont(    int   nHeight,                       //字体的高度int   nWidth,                         //字体的宽度int   nEscapement,               //字体显示的角度int   nOrientation,             //字体的角度int   nWeight,                       //字体的磅数
BYTE   bItalic,                     //斜体字体
BYTE   bUnderline,               //带下划线的字体
BYTE   cStrikeOut,               //带删除线的字体
BYTE   nCharSet,                   //所需的字符集
BYTE   nOutPrecision,         //输出的精度
BYTE   nClipPrecision,       //裁减的精度
BYTE   nQuality,                   //逻辑字体与输出设备的实际//字体之间的精度
BYTE   nPitchAndFamily,     //字体间距和字体集
LPCTSTR   lpszFacename       //字体名称
);