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#0143 CClientDC dc(this);
#0144 OnPrepareDC(&dc);
#0145 dc。DPtoLP(&point);
#0146
#0147 m_pStrokeCur = GetDocument()…》NewStroke();
#0148 // Add first point to the new stroke
#0149 m_pStrokeCur…》m_pointArray。Add(point);
#0150
#0151 SetCapture(); // Capture the mouse until button up。
#0152 m_ptPrev = point; // Serves as the MoveTo() anchor point for the
#0153 // LineTo() the next point; as the user drags the
#0154 // mouse。
#0155
#0156 return;
#0157 }
#0158
#0159 void CScribbleView::OnLButtonUp(UINT; CPoint point)
#0160 {
#0161 // Mouse button up is interesting in the Scribble application
#0162 // only if the user is currently drawing a new stroke by dragging
#0163 // the captured mouse。
#0164
#0165 if (GetCapture() != this)
#0166 return; // If this window (view) didn't capture the mouse;
#0167 // then the user isn't drawing in this window。
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第五篇 附錄
#0168
#0169 CScribbleDoc* pDoc = GetDocument();
#0170
#0171 CClientDC dc(this);
#0172
#0173 // CScrollView changes the viewport origin and mapping mode。
#0174 // It's necessary to convert the point from device coordinates
#0175 // to logical coordinates; such as are stored in the document。
#0176 OnPrepareDC(&dc); // set up mapping mode and viewport origin
#0177 dc。DPtoLP(&point);
#0178
#0179 CPen* pOldPen = dc。SelectObject(pDoc…》GetCurrentPen());
#0180 dc。MoveTo(m_ptPrev);
#0181 dc。LineTo(point);
#0182 dc。SelectObject(pOldPen);
#0183 m_pStrokeCur…》m_pointArray。Add(point);
#0184
#0185 // Tell the stroke item that we're done adding points to it。
#0186 // This is so it can finish puting its bounding rectangle。
#0187 m_pStrokeCur…》FinishStroke();
#0188
#0189 // Tell the other views that this stroke has been added
#0190 // so that they can invalidate this stroke's area in their
#0191 // client area。
#0192 pDoc…》UpdateAllViews(this; 0L; m_pStrokeCur);
#0193
#0194 ReleaseCapture(); // Release the mouse capture established at
#0195 // the beginning of the mouse drag。
#0196 return;
#0197 }
#0198
#0199 void CScribbleView::OnMouseMove(UINT; CPoint point)
#0200 {
#0201 // Mouse movement is interesting in the Scribble application
#0202 // only if the user is currently drawing a new stroke by dragging
#0203 // the captured mouse。
#0204
#0205 if (GetCapture() != this)
#0206 return; // If this window (view) didn't capture the mouse;
#0207 // then the user isn't drawing in this window。
#0208
#0209 CClientDC dc(this);
#0210 // CScrollView changes the viewport origin and mapping mode。
#0211 // It's necessary to convert the point from device coordinates
#0212 // to logical coordinates; such as are stored in the document。
#0213 OnPrepareDC(&dc);
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附錄B Scribble Step5 完整原始碼
#0214 dc。DPtoLP(&point);
#0215
#0216 m_pStrokeCur…》m_pointArray。Add(point);
#0217
#0218 // Draw a line from the previous detected point in the mouse
#0219 // drag to the current point。
#0220 CPen* pOldPen = dc。SelectObject(GetDocument()…》GetCurrentPen());
#0221 dc。MoveTo(m_ptPrev);
#0222 dc。LineTo(point);
#0223 dc。SelectObject(pOldPen);
#0224 m_ptPrev = point;
#0225 return;
#0226 }
#0227
#0228 void CScribbleView::OnUpdate(CView* /* pSender */; LPARAM /* lHint */;
#0229 CObject* pHint)
#0230 {
#0231 // The document has informed this view that some data has changed。
#0232
#0233 if (pHint != NULL)
#0234 {
#0235 if (pHint…》IsKindOf(RUNTIME_CLASS(CStroke)))
#0236 {
#0237 // The hint is that a stroke as been added (or changed)。
#0238 // So; invalidate its rectangle。
#0239 CStroke* pStroke = (CStroke*)pHint;
#0240 CClientDC dc(this);
#0241 OnPrepareDC(&dc);
#0242 CRect rectInvalid = pStroke…》GetBoundingRect();
#0243 dc。LPtoDP(&rectInvalid);
#0244 InvalidateRect(&rectInvalid);
#0245 return;
#0