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大虾求救.急急急急!!高分求解!! 与重画有关的简单问题.
在里面画了一个波形图, 想在鼠标移动的同时,在水平和垂直方向画两条直线,并且显示,当前点的坐标值!我的代码如下'
CRect rect;
GetWindowRect(&rect);
CPen pen(PS_SOLID,1,RGB(180,180,180));
CPen *oldPen;
oldPen=pDC->SelectObject(&pen);
pDC->MoveTo(CPoint(point.x,0));
pDC->LineTo(CPoint(point.x,rect.Height()));
pDC->MoveTo(CPoint(0,point.y));
pDC->LineTo(CPoint(rect.Width(),point.y));
pDC->SelectObject(oldPen);
Invalidate(TRUE);
但是每次都重画,屏幕闪的根本看不清,.
第一个答对给满分!
CRect rect;
GetWindowRect(&rect);
CPen pen(PS_SOLID,1,RGB(180,180,180));
CPen *oldPen;
oldPen=pDC->SelectObject(&pen);
pDC->MoveTo(CPoint(point.x,0));
pDC->LineTo(CPoint(point.x,rect.Height()));
pDC->MoveTo(CPoint(0,point.y));
pDC->LineTo(CPoint(rect.Width(),point.y));
pDC->SelectObject(oldPen);
Invalidate(TRUE);
但是每次都重画,屏幕闪的根本看不清,.
第一个答对给满分!
...全文
当前发帖距今超过3年，不再开放新的回复
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VCVCVC 2001-04-13
CRect rect;
GetWindowRect(&rect);
CClientDC pDC(this);
CPen *oldPen;
InvalidateRect(NULL,true);
this->UpdateWindow();
CPen pen(PS_SOLID,1,RGB(180,180,180));
oldPen = pDC.SelectObject(&pen);
pDC.MoveTo(CPoint(point.x,0));
pDC.LineTo(CPoint(point.x,rect.Height()));
pDC.MoveTo(CPoint(0,point.y));
pDC.LineTo(CPoint(rect.Width(),point.y));
pDC.SelectObject(oldPen);
试试这个吧：）应该可以的
GetWindowRect(&rect);
CClientDC pDC(this);
CPen *oldPen;
InvalidateRect(NULL,true);
this->UpdateWindow();
CPen pen(PS_SOLID,1,RGB(180,180,180));
oldPen = pDC.SelectObject(&pen);
pDC.MoveTo(CPoint(point.x,0));
pDC.LineTo(CPoint(point.x,rect.Height()));
pDC.MoveTo(CPoint(0,point.y));
pDC.LineTo(CPoint(rect.Width(),point.y));
pDC.SelectObject(oldPen);
试试这个吧：）应该可以的
hooligan 2001-04-12
不要用Invalidate(TRUE) ,用InvalidateRect(...),指定要刷新的区域，只要包含你的线就可以了，区域越小，闪烁就越小。
qiaoyu2k 2001-04-12
快点回答呀!
hooligan 2001-04-12
不可能的，怎么个不行啊？
qiaoyu2k 2001-04-12
to hooligan(风)
试了,还是不行
试了,还是不行
ffmm 2001-04-12
利用光栅操作（异或操作，画两次同样的线就会擦除），在鼠标移动消息时先重画要擦掉的线再画现在要的线，
void DrawLine(CDC *pDC,CPoint point)
{
int oldrop=pDC->SetROP2(R2_NOTXORPEN);
CPen pen(PS_DOT,1,RGB(192,192,192));
CPen*oldpen=pDC->SelectObject(&pen);
pDC->MoveTo(CPoint(point.x,0));
pDC->LineTo(CPoint(point.x,rect.Height()));
pDC->MoveTo(CPoint(0,point.y));
pDC->LineTo(CPoint(rect.Width(),point.y));
pDC->SetROP2(oldrop);
pDC->SelectObject(oldpen);
}
这样不用重新刷新，就不会闪屏了
void DrawLine(CDC *pDC,CPoint point)
{
int oldrop=pDC->SetROP2(R2_NOTXORPEN);
CPen pen(PS_DOT,1,RGB(192,192,192));
CPen*oldpen=pDC->SelectObject(&pen);
pDC->MoveTo(CPoint(point.x,0));
pDC->LineTo(CPoint(point.x,rect.Height()));
pDC->MoveTo(CPoint(0,point.y));
pDC->LineTo(CPoint(rect.Width(),point.y));
pDC->SetROP2(oldrop);
pDC->SelectObject(oldpen);
}
这样不用重新刷新，就不会闪屏了
hooligan 2001-04-12
然后在OnMouseMove中调InvalidateRect()
hooligan 2001-04-12
是这个样子的，你应该把画线的代码放在OnDraw里
qiaoyu2k 2001-04-12
to yaw() and hooligan(风)
我试了你们的方法,但是自己又时画的线也被重画掉了
CRect rect;
GetWindowRect(&rect);
InvalidateRect(CRect(oldpoint.x-1,0,oldpoint.x+1,rect.Height()),FALSE);
InvalidateRect(CRect(0,oldpoint.y-1,rect.Width(),oldpoint.y+1),FALSE);
CDC * pDC=GetDC();
// m_pChart->DoDraw(pDC, &m_DragInfo );
CPen pen(PS_SOLID,1,RGB(180,180,180));
CPen *oldPen;
oldPen=pDC->SelectObject(&pen);
pDC->MoveTo(CPoint(point.x,0));
pDC->LineTo(CPoint(point.x,rect.Height()));
pDC->MoveTo(CPoint(0,point.y));
pDC->LineTo(CPoint(rect.Width(),point.y));
pDC->SelectObject(oldPen);
我试了你们的方法,但是自己又时画的线也被重画掉了
CRect rect;
GetWindowRect(&rect);
InvalidateRect(CRect(oldpoint.x-1,0,oldpoint.x+1,rect.Height()),FALSE);
InvalidateRect(CRect(0,oldpoint.y-1,rect.Width(),oldpoint.y+1),FALSE);
CDC * pDC=GetDC();
// m_pChart->DoDraw(pDC, &m_DragInfo );
CPen pen(PS_SOLID,1,RGB(180,180,180));
CPen *oldPen;
oldPen=pDC->SelectObject(&pen);
pDC->MoveTo(CPoint(point.x,0));
pDC->LineTo(CPoint(point.x,rect.Height()));
pDC->MoveTo(CPoint(0,point.y));
pDC->LineTo(CPoint(rect.Width(),point.y));
pDC->SelectObject(oldPen);
yaw 2001-04-12
_________
| A |
| ___|___
| | C | |
____|___| |
| B |
|-------|
C = A交BI
InvalidateRect( a.left, a.top, a.rigth, c.top);
InvalidateRect( a.left, c.top, b.rigth, c.bottom);
InvalidateRect( c.left, c.bottom, b.rigth, b.bottom);
| A |
| ___|___
| | C | |
____|___| |
| B |
|-------|
C = A交BI
InvalidateRect( a.left, a.top, a.rigth, c.top);
InvalidateRect( a.left, c.top, b.rigth, c.bottom);
InvalidateRect( c.left, c.bottom, b.rigth, b.bottom);
musicdancer 2001-04-12
可以用内存DC。先画在他上面，然后BitBlt.结合楼上的用法更好。
