论坛 › 『 提问交流 』 › 类似桌面粉笔那种软件的笔迹显示的原理是什么

sanmoking 发表于 2009-9-13 18:39:15

类似桌面粉笔那种软件的笔迹显示的原理是什么

类似桌面粉笔那种软件的笔迹显示的原理是什么？就是直接在屏幕上显示出来颜色。
多谢各位帮忙解疑的领导。。

sewell85 发表于 2010-5-7 14:44:18

学习中，，，，

wuweixian 发表于 2010-5-7 14:57:40

关注中:face (35):

lxz 发表于 2010-5-7 15:13:02

我也想知道啊...

lynfr8 发表于 2010-5-8 16:46:30

如此？

关键思路部分代码：
Func myup()
$click = True
EndFunc ;==>myup
Func mydown()
If $click = True Then
$click = False
_GDIPlus_Startup()
$hGraphic = _GDIPlus_GraphicsCreateFromHWND($hWnd)
For $i = 1 To 20
$xy1 = MouseGetPos()
Sleep(100)
$xy2 = MouseGetPos()
$hPen = _GDIPlus_PenCreate(0xFFee0000, 8)
_GDIPlus_PenSetWidth($hPen, 8)
_GDIPlus_GraphicsDrawLine($hGraphic, $xy1, $xy1, $xy2, $xy2, $hPen)
Next
Else
$click = True
EndIf
EndFunc ;==>mydown

lynfr8 发表于 2010-5-8 16:48:10

void CDrawView::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
m_ptOrigin=m_ptOld=point;
m_bDraw=TRUE;
CView::OnLButtonDown(nFlags, point);
}

void CDrawView::OnLButtonUp(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
/*HDC hdc;
hdc=::GetDC(m_hWnd);
MoveToEx(hdc,m_ptOrigin.x,m_ptOrigin.y,NULL);
LineTo(hdc,point.x,point.y);
::ReleaseDC(m_hWnd,hdc);*/
/*CDC *pDC=GetDC();
pDC->MoveTo(m_ptOrigin);
pDC->LineTo(point);
ReleaseDC(pDC);*/

//CClientDC dc(this);
/*CClientDC dc(GetParent());
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);*/

//CWindowDC dc(this);
//CWindowDC dc(GetParent());
/*CWindowDC dc(GetDesktopWindow());
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);*/
/*CPen pen(PS_DOT,1,RGB(0,255,0));
CClientDC dc(this);
CPen *pOldPen=dc.SelectObject(&pen);
dc.MoveTo(m_ptOrigin);
dc.LineTo(point);
dc.SelectObject(pOldPen);*/
// CBrush brush(RGB(255,0,0));

/*CBitmap bitmap;
bitmap.LoadBitmap(IDB_BITMAP1);
CBrush brush(&bitmap);*/
/*CClientDC dc(this);
//dc.FillRect(CRect(m_ptOrigin,point),&brush);
CBrush *pBrush=CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));
CBrush *pOldBrush=dc.SelectObject(pBrush);
dc.Rectangle(CRect(m_ptOrigin,point));
dc.SelectObject(pOldBrush);*/
m_bDraw=FALSE;
CView::OnLButtonUp(nFlags, point);
}

void CDrawView::OnMouseMove(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
CClientDC dc(this);
CPen pen(PS_SOLID,1,RGB(255,0,0));
CPen *pOldPen=dc.SelectObject(&pen);
if(m_bDraw==TRUE)
{
dc.SetROP2(R2_BLACK);
dc.MoveTo(m_ptOrigin);
//dc.LineTo(point);
dc.LineTo(m_ptOld);
//dc.MoveTo(m_ptOrigin);
dc.MoveTo(m_ptOld);
dc.LineTo(point);
//m_ptOrigin=point;
m_ptOld=point;
}
dc.SelectObject(pOldPen);
CView::OnMouseMove(nFlags, point);
}此乃VC版电子粉笔代码，借鉴下（网络所获，与本人无关）

linkuncool 发表于 2010-5-8 18:20:19

学习了 学习

要学的东西太多了

netegg 发表于 2010-5-9 00:11:58

应该是gdi里笔形的事情

netegg 发表于 2010-5-9 00:12:02

应该是gdi里笔形的事情

lxz 发表于 2010-5-9 06:56:47

是这样的意思,就是效果不怎么好啊.

查看完整版本: 类似桌面粉笔那种软件的笔迹显示的原理是什么