****Dlg.h头文件加入：
//为project加入画笔、点变量数组
public:
CPen m_pen[5];
CPoint m_point[5];
public:
void DrawLine(CDC *pDC);
void DrawPolyline(CDC *pDC);
void DrawPolygon(CDC *pDC);
void DrawRect(CDC *pDC);
void DrawRoundRect(CDC *pDC);
void DrawEllipse(CDC *pDC);
void DrawArc(CDC *pDC);
void DrawAngleArc(CDC *pDC);
****Dlg.cpp构造函数改动：
CLineTestDlg::CLineTestDlg(CWnd* pParent /*=NULL*/)
: CDialogEx(CLineTestDlg::IDD, pParent)
{
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); //初始化画笔、点变量数组
m_pen[0].CreatePen(PS_SOLID,1,RGB(255,0,0)); //红色实线。1像素宽---參数：样式、宽度、颜色
m_pen[1].CreatePen(PS_SOLID,6,RGB(0,255,0)); //绿色实线，6像素宽
m_pen[2].CreatePen(PS_DASH,1,RGB(255,0,0)); //红色虚线，必须为一个像素宽
m_pen[3].CreatePen(PS_DOT,1,RGB(0,0,255)); //蓝色点线。必须为一个像素宽
m_pen[4].CreatePen(PS_DASHDOTDOT,1,RGB(255,0,0));//红色双点虚线，必须为一个像素宽 //绘制多边形的点数组
m_point[0].x=10;
m_point[0].y=100;
m_point[1].x=10;
m_point[1].y=120;
m_point[2].x=100;
m_point[2].y=105;
m_point[3].x=170;
m_point[3].y=120;
m_point[4].x=170;
m_point[4].y=100;
}
***Dlg.cpp onpaint函数
void CLineTestDlg::OnPaint()
{
CPaintDC dc(this); // 用于绘制的设备上下文
CBrush brush(RGB(190,190,190));//画刷
dc.SelectObject(&brush);//将画刷选入DC
DrawLine(&dc);
DrawPolyline(&dc);
DrawPolygon(&dc);
DrawRect(&dc);
DrawRoundRect(&dc);
DrawEllipse(&dc);
DrawArc(&dc);
DrawAngleArc(&dc); if (IsIconic())
{
CPaintDC dc(this); // 用于绘制的设备上下文
SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0); // 使图标在工作区矩形中居中
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2; // 绘制图标
dc.DrawIcon(x, y, m_hIcon); }
else
{
CDialogEx::OnPaint();
}
}
定义画图函数：
//绘制直线函数
void CLineTestDlg::DrawLine(CDC *pDC)
{
CPen *oldPen=pDC->SelectObject(&m_pen[0]);//保存DC原始画笔
for(int i=0;i<5;i++)
{
pDC->SelectObject(&m_pen[i]); //将画笔选入DC
pDC->MoveTo(20,20+i*15); //设置DC当前点
pDC->LineTo(170,20+i*15); //绘制直线
}
pDC->SelectObject(oldPen); //回复DC原画笔
} //绘制折线
void CLineTestDlg::DrawPolyline(CDC *pDC)
{
CPen *oldPen=pDC->SelectObject(&m_pen[0]);//保存DC原始画笔
for(int i=0;i<5;i++)
{
for(int j=0;j<5;j++)
{
m_point[j].y+=35; //每次下移35个像素
}
pDC->SelectObject(&m_pen[i]);
pDC->Polyline(m_point,5);
}
pDC->SelectObject(oldPen);
} //绘制多边形
void CLineTestDlg::DrawPolygon(CDC *pDC)
{
for(int j=0;j<5;j++)
m_point[j].y+=75; //数组中的点下移75个像素
CPen *oldPen=pDC->SelectObject(&m_pen[0]);//保存DC原始画笔
for(int i=0;i<5;i++)
{
for(int j=0;j<5;j++)
{
m_point[j].y+=35; //每次绘制图形下移35个像素
}
pDC->SelectObject(&m_pen[i]);
pDC->Polygon(m_point,5); //绘制多边形
}
pDC->SelectObject(oldPen);
} //绘制矩形
void CLineTestDlg::DrawRect(CDC *pDC)
{
CRect rect(150,20,220,80);
CPen *oldPen=pDC->SelectObject(&m_pen[0]);
for(int i=0;i<5;i++)
{
rect.OffsetRect(80,0);//每次画图右移80个像素
pDC->SelectObject(&m_pen[i]);
pDC->Rectangle(&rect);//绘制矩形
}
pDC->SelectObject(oldPen);
} //绘制圆角矩形
void CLineTestDlg::DrawRoundRect(CDC *pDC)
{
CRect rect(150,150,220,230);
CPen *oldPen=pDC->SelectObject(&m_pen[0]);
for(int i=0;i<5;i++)
{
rect.OffsetRect(80,0);//每次画图右移80个像素
pDC->SelectObject(&m_pen[i]);
pDC->RoundRect(&rect,CPoint(15,15));
}
pDC->SelectObject(oldPen);
} //绘制椭圆
void CLineTestDlg::DrawEllipse(CDC *pDC)
{
CRect rect(150,260,220,310);
CPen *oldPen=pDC->SelectObject(&m_pen[0]);
for(int i=0;i<5;i++)
{
rect.OffsetRect(80,0);
pDC->SelectObject(&m_pen[i]);
pDC->Ellipse(&rect);
}
pDC->SelectObject(oldPen);
} //绘制弧线
void CLineTestDlg::DrawArc(CDC *pDC)
{
CRect rect(150,400,220,460);
CPoint ptStart(170,440);
CPoint ptEnd(210,400);
CPen *oldPen=pDC->SelectObject(&m_pen[0]);
for(int i=0;i<5;i++)
{
rect.OffsetRect(80,0);
ptStart+=CPoint(80,0);
ptEnd+=CPoint(80,0);
pDC->SelectObject(&m_pen[i]);
pDC->Arc(&rect,ptStart,ptEnd);
}
pDC->SelectObject(oldPen);
} //绘制直线与弧线
void CLineTestDlg::DrawAngleArc(CDC *pDC)
{
CRect rect(150,500,220,560);
CPoint ptCenter(185,600);
CPoint ptStart(150,630);
int r=30;
float angleStart=0;
float angleEnd=180;
CPen *oldPen=pDC->SelectObject(&m_pen[0]);
for(int i=0;i<5;i++)
{
rect.OffsetRect(80,0);
ptStart+=CPoint(80,0);
pDC->MoveTo(ptStart);
pDC->SelectObject(&m_pen[i]);
pDC->AngleArc(ptCenter.x,ptCenter.y,r,angleStart,angleEnd);
}
pDC->SelectObject(oldPen);
}
执行效果：