Masters, some questions about VC drawing dotted lines?

firehawk85

The points and points I draw with CPen's PS_DOT type are too small and the distance is narrow. How do I make the point larger and how to adjust the distance between points.
   The method of drawing a small circle at the starting point and the ending point can solve my problem, but isn't this clumsy and the speed is particularly slow? (I have to draw a lot, almost full screen)
   Wang experts enlighten simple methods, as far as possible through the function provided by gdi

qiaojia

The second parameter of the CPen constructor specifies the line width. You can increase its value to increase the line width. You can use LineTo to draw continuous lines.
The following is called in the onPaint function:
CPen pen (PS_DOT, 20, RGB (0, 0, 255));
CClient dc (this);
CPen * oldPen = dc.SelectObject (&pen);
dc.MoveTo (m_ptOrigin);
dc.LineTo (point);
dc.SelectObject (&pOldPen);

huanwu

// CDialog :: OnPaint ();
        CPaintDC dc (this);
        LOGBRUSH lb;
        lb.lbColor = RGB (255,0,0);
        lb.lbHatch = HS_CROSS;
        lb.lbStyle = BS_SOLID;

        CPen NewPen (PS_GEOMETRIC | PS_DOT | PS_ENDCAP_SQUARE, 20,&lb, 0, NULL);
        CPen * pOldPen = dc.SelectObject (&NewPen);
        dc.MoveTo (20,20);
        dc.LineTo (200,200);
        dc.SelectObject (pOldPen);

kkedward

The method upstairs is to use the second constructor of cpen. Use clientdc to draw?
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CClientDC dc (this);
        LOGBRUSH lb;
        lb.lbColor = RGB (255,0,0);
        lb.lbHatch = HS_CROSS;
        lb.lbStyle = BS_SOLID;

        CPen NewPen (PS_GEOMETRIC | PS_DOT | PS_ENDCAP_SQUARE, 20,&lb, 0, NULL);
        CPen * pOldPen = dc.SelectObject (&NewPen);
        dc.MoveTo (20,20);
        dc.LineTo (200,200);
        dc.SelectObject (pOldPen);

firehawk85

Thank you two upstairs. The point size problem is solved, but what about distance?

tianfeng

That one seems to change the brush, but I’m not sure

霜之哀愁

The distance is large, then you can just draw some

tonychen82

Are you going to draw a dotted line?

kkedward

firehawk85


   
Thank you two upstairs. The point size problem is solved, but what about distance?

  

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Distance is related to width. You see on MSDN, when you change from 20 to 10, isn't the spacing smaller?