如何改变画笔的颜色

Question

我在用VC画矩形,圆形,线时,想改变画笔的颜色,用了以下函数
         CPen p;
p.CreatePen(PS_SOLID,PS_GEOMETRIC,RGB(255,0,0));
         pDC->SelectStockObject(NULL_BRUSH);
         pDC->Rectangle(Start.x,Start.y,End.x,End.y);
    可是为什么画出来的还是黑色的线?
 我是菜鸟,请各位高手指教,最好写清楚些,多谢了!

Answer 1

选入画笔
pDC->SelectStockObject(p);

Answer 2

COLORREF CopyColor = RGB(???,???,???)//自己定义
CPen pen(PS_SOLID, 1, CopyColor), *oldpen;
int oldmode = pDC->GetROP2();
oldpen = pDC->SelectObject(&pen);
pDC->SetROP2(R2_COPYPEN); pDC->MoveTo(m_x1, m_y1);//移动当前绘图点为线段第一点
pDC->LineTo(m_x2, m_y2);//绘制直线 pDC->SelectObject(oldpen);
pDC->SetROP2(oldmode);
pen.DeleteObject();//释放笔资源

Answer 3

CPen p,*pOldPen;         //定义画笔
    p.CreatePen(PS_SOLID,PS_GEOMETRIC,RGB(255,0,0));  //初始化画笔（红色）
    pOldPen=pDC->SelectObject(&p);  //把画笔选入DC，并保存原来画笔
    pDC->Rectangle(Start.x,Start.y,End.x,End.y);     //开始绘图

Answer 4

在OnDraw里
COLORREF CopyColor = RGB(???,???,???)//自己定义
CPen pen(PS_SOLID, 1, CopyColor), *oldpen;
oldpen = pDC->SelectObject(&pen); pDC->MoveTo(m_x1, m_y1);//移动当前绘图点为线段第一点
pDC->LineTo(m_x2, m_y2);//绘制直线 pDC->SelectObject(oldpen);
pen.DeleteObject();//释放笔资源

Answer 5

CPen p;pDC->SelectObject(&p);

Answer 6

CPen ipen(PS_SOLID,1 ,RGB(255,0,0));
pDC->SelectObject(&ipen);
pDC->SetPixel(pa.x,pa.y,RGB(255,255,0));

Answer 7

CPen ps(PS_SOLID, 1, RGB(255, 0, 0));

Answer 8

CPen p;
p.CreatePen(PS_SOLID,PS_GEOMETRIC,RGB(255,0,0));
         pDC->SelectObject(&p);
         pDC->SelectStockObject(NULL_BRUSH);
         pDC->Rectangle(Start.x,Start.y,End.x,End.y);