ps中的异形画笔是怎样实现的

[yutingxiaozhe]

ps中的那种特殊画笔用vc怎样实现，我用定义的位图画笔画不出那种效果，出现的是一个一个的位图，而ps中画笔一拖就像是拿刷子涂上去的（蜡笔什么的）

[xiaoyisnail]

mark

[waizqfor]

好像弄不出来 不知道MFC能行不 里面有几个相关的类和函数 也就是画矩形 圆啥的 没听说还有蜡笔 刷子
帮顶

[yutingxiaozhe]

就是看有什么算法没有，可以用mfc实现

[waizqfor]

一个用MFC模仿windows的例子

#include "stdafx.h" 
#include "Draw.h" 
#include "DrawDoc.h" 
#include "DrawView.h" 

#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 

///////////////////////////////////////////////////////////////////////////// 
// CDrawView 

IMPLEMENT_DYNCREATE(CDrawView, CView) 

BEGIN_MESSAGE_MAP(CDrawView, CView) 
//{{AFX_MSG_MAP(CDrawView) 
ON_WM_CREATE() 
ON_COMMAND(ID_DRAW_LINECOLOR, OnDrawLinecolor) 
ON_COMMAND(ID_DRAW_FILLCOLOR, OnDrawFillcolor) 
ON_WM_LBUTTONUP() 
ON_WM_MOUSEMOVE() 
ON_WM_LBUTTONDOWN() 
ON_WM_SETCURSOR() 
//}}AFX_MSG_MAP 
ON_COMMAND_RANGE(ID_DRAW_LINE,ID_DRAW_FILL, OnSelectDrawType) 
ON_UPDATE_COMMAND_UI_RANGE(ID_DRAW_LINE,ID_DRAW_FILL, OnUpdateSelectDrawType) 

ON_COMMAND_RANGE(ID_DRAW_LINEWIDTH_ONE,ID_DRAW_LINEWIDTH_FIVE, OnDrawLineWidth) 
ON_UPDATE_COMMAND_UI_RANGE(ID_DRAW_LINEWIDTH_ONE,ID_DRAW_LINEWIDTH_FIVE,OnUpdateDrawLineWidth) 
// Standard printing commands 
ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint) 
ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint) 
ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview) 
END_MESSAGE_MAP() 

///////////////////////////////////////////////////////////////////////////// 
// CDrawView construction/destruction 

CDrawView::CDrawView() 
{ 
// TODO: add construction code here 
m_pMemDC = new CDC; 
m_pBitmap = new CBitmap; 
m_nDrawType = -1; 
m_nLineWidth = 1; 
m_cLineColor = RGB(0,0,0); 
m_cFillColor = RGB(0,0,255); 
m_bDrawing = false; 

} 

CDrawView::~CDrawView() 
{ 
delete m_pMemDC; 
delete m_pBitmap; 
} 

BOOL CDrawView::PreCreateWindow(CREATESTRUCT& cs) 
{ 
// TODO: Modify the Window class or styles here by modifying 
// the CREATESTRUCT cs 

return CView::PreCreateWindow(cs); 
} 

///////////////////////////////////////////////////////////////////////////// 
// CDrawView drawing 

void CDrawView::OnDraw(CDC* pDC) 
{ 
CDrawDoc* pDoc = GetDocument(); 
ASSERT_VALID(pDoc); 
// TODO: add draw code for native data here 
CBitmap * pOldBitmap = m_pMemDC->SelectObject(m_pBitmap); 

pDC->BitBlt(0,0,m_nMaxX, m_nMaxY, m_pMemDC, 0,0, SRCCOPY); 

m_pMemDC->SelectObject(pOldBitmap); 
} 

///////////////////////////////////////////////////////////////////////////// 
// CDrawView printing 

BOOL CDrawView::OnPreparePrinting(CPrintInfo* pInfo) 
{ 
// default preparation 
return DoPreparePrinting(pInfo); 
} 
void CDrawView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) 
{ 
// TODO: add extra initialization before printing 
} 
void CDrawView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) 
{ 
// TODO: add cleanup after printing 
} 
///////////////////////////////////////////////////////////////////////////// 
// CDrawView diagnostics 
#ifdef _DEBUG 
void CDrawView::AssertValid() const 
{ 
CView::AssertValid(); 
} 
void CDrawView::Dump(CDumpContext& dc) const 
{ 
CView::Dump(dc); 
} 
CDrawDoc* CDrawView::GetDocument() // non-debug version is inline 
{ 
ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CDrawDoc))); 
return (CDrawDoc*)m_pDocument; 
} 
#endif //_DEBUG 
///////////////////////////////////////////////////////////////////////////// 
// CDrawView message handlers 

[waizqfor]

int CDrawView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{ 
if (CView::OnCreate(lpCreateStruct) == -1) 
return -1; 
// TODO: Add your specialized creation code here 
m_nMaxX = GetSystemMetrics(SM_CXSCREEN); 
m_nMaxY = GetSystemMetrics(SM_CYSCREEN); 
CDC * pDC = GetDC(); 
m_pMemDC->CreateCompatibleDC(pDC); 
m_pBitmap->CreateCompatibleBitmap(pDC, m_nMaxX, m_nMaxY); 
CBitmap * pOldBitmap = m_pMemDC->SelectObject(m_pBitmap); 
CBrush brush; 
brush.CreateStockObject(WHITE_BRUSH); 
CRect rect(-1,-1,m_nMaxX, m_nMaxY); 
m_pMemDC->FillRect(rect,&brush); 
m_pMemDC->SelectObject(pOldBitmap); 
ReleaseDC(pDC); 
return 0; 
} 
void CDrawView::OnSelectDrawType(UINT nID) 
{ 
m_nDrawType = nID - ID_DRAW_LINE; 
} 
void CDrawView::OnUpdateSelectDrawType(CCmdUI * pCmdUI) 
{ 
int nID = pCmdUI->m_nID - ID_DRAW_LINE; 
if(nID == m_nDrawType) 
pCmdUI->SetCheck(true); 
else 
pCmdUI->SetCheck(false); 
} 
void CDrawView::OnDrawLineWidth(UINT nID) 
{ 
m_nLineWidth = nID - ID_DRAW_LINEWIDTH_ONE + 1; 
} 
void CDrawView::OnUpdateDrawLineWidth(CCmdUI * pCmdUI) 
{ 
int nID = pCmdUI->m_nID - ID_DRAW_LINEWIDTH_ONE + 1; 
if(nID == m_nLineWidth) 
pCmdUI->SetCheck(true); 
else 
pCmdUI->SetCheck(false); 
} 
void CDrawView::OnDrawLinecolor() 
{ 
// TODO: Add your command handler code here 
CColorDialog dlg; 
dlg.m_cc.Flags |= CC_PREVENTFULLOPEN | CC_RGBINIT; 
dlg.m_cc.rgbResult = m_cLineColor; 
if(dlg.DoModal() == IDOK) 
{ 
m_cLineColor = dlg.GetColor(); 
} } 
void CDrawView::OnDrawFillcolor() 
{ 
// TODO: Add your command handler code here 
CColorDialog dlg; 
dlg.m_cc.Flags |= CC_PREVENTFULLOPEN | CC_RGBINIT; 
dlg.m_cc.rgbResult = m_cFillColor; 
if(dlg.DoModal() == IDOK) 
{ 
m_cFillColor = dlg.GetColor(); 
} 
} 
void CDrawView::OnLButtonDown(UINT nFlags, CPoint point) 
{ 
// TODO: Add your message handler code here and/or call default 
SetCapture(); 
m_bDrawing = true; 
m_ptStart = point; 
m_ptOld = point; 
if(m_nDrawType == 3) 
{ 
CBrush * pOldBrush; 
CBitmap * pOldBitmap; 

CBrush brFill; 
brFill.CreateSolidBrush(m_cFillColor); 
pOldBrush = m_pMemDC->SelectObject(&brFill); 
pOldBitmap = m_pMemDC->SelectObject(m_pBitmap); 

m_pMemDC->ExtFloodFill(point.x,point.y, m_pMemDC->GetPixel(point), FLOODFILLSURFACE); 
Invalidate(false); 
m_pMemDC->SelectObject(pOldBrush); 
m_pMemDC->SelectObject(pOldBitmap); 
m_bDrawing = false; 
} 

CView::OnLButtonDown(nFlags, point); 
} 

void CDrawView::OnMouseMove(UINT nFlags, CPoint point) 
{ 
// TODO: Add your message handler code here and/or call default 
if(m_bDrawing) 
{ 
CDC * pDC = GetDC(); 
CBitmap * pOldBitmap = m_pMemDC->SelectObject(m_pBitmap); 
CPen pen; 
pen.CreatePen(PS_SOLID, m_nLineWidth, m_cLineColor); 
CPen * pOldPen = pDC->SelectObject(&pen); 
CBrush * pOldBrush = (CBrush *) pDC->SelectStockObject(NULL_BRUSH); 
CRect rectOld(m_ptStart, m_ptOld); 
rectOld.NormalizeRect(); 
rectOld.InflateRect(m_nLineWidth, m_nLineWidth); 
pDC->BitBlt(rectOld.left, rectOld.top, rectOld.Width(), rectOld.Height(),m_pMemDC, rectOld.left, rectOld.top, SRCCOPY); 
CRect rectNew(m_ptStart,point); 
switch(m_nDrawType) 
{ 
case 0: 
pDC->MoveTo(m_ptStart); 
pDC->LineTo(point); 
break; 
case 1: 
pDC->Rectangle(rectNew); 
break; 
case 2: 
pDC->Ellipse(rectNew); 
break; 
default: 
break; 
} 
m_pMemDC->SelectObject(pOldBitmap); 
pDC->SelectObject(pOldPen); 
pDC->SelectObject(pOldBrush); 
ReleaseDC(pDC); 
m_ptOld = point; 
} 
CView::OnMouseMove(nFlags, point); 
} 
void CDrawView::OnLButtonUp(UINT nFlags, CPoint point) 
{ 
// TODO: Add your message handler code here and/or call default 
if(m_bDrawing) 
{ 
m_bDrawing = false; 
CBitmap * pOldBitmap = m_pMemDC->SelectObject(m_pBitmap); 
CPen pen; 
pen.CreatePen(PS_SOLID, m_nLineWidth, m_cLineColor); 
CPen * pOldPen = m_pMemDC->SelectObject(&pen); 
CBrush * pOldBrush = (CBrush *) m_pMemDC->SelectStockObject(NULL_BRUSH); 
CRect rectNew(m_ptStart,point); 
switch(m_nDrawType) 
{ 
case 0: 
m_pMemDC->MoveTo(m_ptStart); 
m_pMemDC->LineTo(point); break; 
case 1: 
m_pMemDC->Rectangle(rectNew); break; 
case 2: 
m_pMemDC->Ellipse(rectNew); break; 
default: break; 
} 
Invalidate(false); 
m_pMemDC->SelectObject(pOldBitmap); 
m_pMemDC->SelectObject(pOldPen); 
m_pMemDC->SelectObject(pOldBrush); 
} 
ReleaseCapture(); 
CView::OnLButtonUp(nFlags, point); 
} 
BOOL CDrawView::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{ 
// TODO: Add your message handler code here and/or call default 
switch(m_nDrawType) 
{ case 0: case 1: case 2: ::SetCursor(AfxGetApp()->LoadStandardCursor(IDC_CROSS)); break; 
case 3: 
::SetCursor(AfxGetApp()->LoadCursor(ID_CURSOR_FILL)); break; 
default: 
::SetCursor(AfxGetApp()->LoadStandardCursor(IDC_ARROW)); break; 
} 
return CView::OnSetCursor(pWnd, nHitTest, message); 
} 

[/code]

[hhyttppd]

用brush实现
HBRUSH CreateDIBPatternBrush(
HGLOBAL hglbDIBPacked, // handle to DIB
UINT fuColorSpec // color table data
);

[猫已经找不回了]

mark

[yutingxiaozhe]

好像不行耶，有人说是要用到什么滤波，差值算法之类的

[hhyttppd]

呵呵，你对画进去的再进行处理。
直接使用copy模式应该不行。

[yutingxiaozhe]

哦，这样啊，好的，我再看看

[yutingxiaozhe]

没有人做过吗？怎么没有人回答了

[ep2980]

我感觉VC里所说的路径城可能会有用！

[wiowei]

你用pen当然不行，用brush，HBrush or CBrush，建个位图刷子，CreatePatternBrush，在鼠标消息响应OnMouseMove和onButtonDown/Up里面画呗：鼠标路过的区域（可自定义）用刷子填充你所需要的图案。如果你想图案复杂点，自己写呗
PS里面的刷子多了，有些是根据背景图案和画刷图案以及显示模式一起计算得到的，总之原理都一样：
1 位图计算 2 CreatePatternBrush 3 画出来（画刷填充区域）