mfc绘制数学函数图像

 // mfcplotView.cpp: CmfcplotView 类的实现 // #include "pch.h" #include "framework.h" // SHARED_HANDLERS 可以在实现预览、缩略图和搜索筛选器句柄的 // ATL 项目中进行定义，并允许与该项目共享文档代码。 #ifndef SHARED_HANDLERS #include "mfcplot.h" #endif #include "mfcplotDoc.h" #include "mfcplotView.h" #include <vector> using std::vector; #ifdef _DEBUG #define new DEBUG_NEW #endif // CmfcplotView IMPLEMENT_DYNCREATE(CmfcplotView, CView) BEGIN_MESSAGE_MAP(CmfcplotView, CView) // 标准打印命令 ON_COMMAND(ID_FILE_PRINT, &CView::OnFilePrint) ON_COMMAND(ID_FILE_PRINT_DIRECT, &CView::OnFilePrint) ON_COMMAND(ID_FILE_PRINT_PREVIEW, &CView::OnFilePrintPreview) // ON_WM_NCMOUSEMOVE() ON_WM_MOUSEMOVE() ON_WM_SETCURSOR() ON_COMMAND(ID_MOVE_MENU, &CmfcplotView::OnMoveMenu) ON_WM_LBUTTONDOWN() ON_WM_LBUTTONUP() //ON_UPDATE_COMMAND_UI(ID_EDGE_MENU, &CmfcplotView::OnUpdateEdgeMenu) ON_UPDATE_COMMAND_UI(ID_MOVE_MENU, &CmfcplotView::OnUpdateMoveMenu) ON_WM_LBUTTONDBLCLK() END_MESSAGE_MAP() // CmfcplotView 构造/析构 CmfcplotView::CmfcplotView() noexcept { // TODO: 在此处添加构造代码 isMoving = false; //下面这个没什么用，防止编译警告 tmp_Xmin = m_Xmin = -10; tmp_Xmax = m_Xmax = 10; tmp_Ymin = m_Ymin = -1; tmp_Ymax = m_Ymax = 1; } CmfcplotView::~CmfcplotView() { } BOOL CmfcplotView::PreCreateWindow(CREATESTRUCT& cs) { // TODO: 在此处通过修改 // CREATESTRUCT cs 来修改窗口类或样式 return CView::PreCreateWindow(cs); } // double CmfcplotView::LPxtoFPx(int x) { return m_Xmin + (1.0 * x - nLeft) * (m_Xmax - m_Xmin) / (1.0 * nRight - nLeft); } int CmfcplotView::FPxtoLPx(double x) { return nLeft + (int)round((x - m_Xmin) * (1.0 * nRight - nLeft) / (m_Xmax - m_Xmin)); } double CmfcplotView::LPytoFPy(int y) { return m_Ymin + (1.0 * nButton - y) * (m_Ymax - m_Ymin) / (1.0 * nButton - nTop); } int CmfcplotView::FPytoLPy(double y) { return nButton - (int)round((y - m_Ymin) * (1.0 * nButton - nTop) / (m_Ymax - m_Ymin)); } // CmfcplotView 绘图 void CmfcplotView::OnDraw(CDC* pDC) { CmfcplotDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc); if (!pDoc) return; m_Xmin = pDoc->m_Xmin;//极值保存在Doc中 m_Xmax = pDoc->m_Xmax; m_Ymin = pDoc->m_Ymin; m_Ymax = pDoc->m_Ymax; CRect rect; GetClientRect(&rect);//获得视图区 nTop = (int)round(rect.bottom * 0.1); //函数图像不会占据整个视图区 nButton = (int)round(rect.bottom * 0.9); nLeft = (int)round(rect.right * 0.1); nRight = (int)round(rect.right * 0.9); if (pDoc->m_WillShowEdge) {//画边框 pDC->MoveTo(nLeft, nTop); pDC->LineTo(nLeft, nButton); pDC->LineTo(nRight, nButton); pDC->LineTo(nRight, nTop); pDC->LineTo(nLeft, nTop); } //画x坐标信息 int nX,nY; bool BIGX = abs(m_Xmin) > 100 || abs(m_Xmax) > 100;//x坐标值比较大时，标注更稀 for (nX = nLeft; nX < nRight; nX += (BIGX ? 100 : 50)) { //每隔100/50像素一个标注 CRect textRect(nX - (BIGX ? 50 : 25), nButton + 1, nX + (BIGX ? 50 : 25), nButton + 20);//显示区域 CString xInfo; xInfo.Format(_T("%.2f"),LPxtoFPx(nX)); pDC->DrawText(xInfo, &textRect, DT_SINGLELINE | DT_CENTER); //单行,上下左右居中显示 } if (nX - nRight <= (BIGX ? 50 : 25)) {//最后一个x坐标，与前一个标注距离太近则不显示 CRect textRect(nRight, nButton + 1, nRight + 50, nButton + 20); CString xInfo; xInfo.Format(_T("%.2f"),m_Xmax); pDC->DrawText(xInfo, &textRect, DT_SINGLELINE | DT_LEFT | DT_TOP); } //y坐标 for (nY = nButton - 50; nY > nTop; nY -= 50) { CRect textRect(nLeft - 200, nY-10, nLeft - 3, nY + 10); CString yInfo; yInfo.Format(_T("%.2f"), LPytoFPy(nY)); pDC->DrawText(yInfo, &textRect, DT_SINGLELINE | DT_RIGHT); } if (nTop - nY <= 25) { CRect textRect(nLeft - 200, nTop - 10, nLeft - 3, nTop + 10); CString yInfo; yInfo.Format(_T("%.2f"),m_Ymax); pDC->DrawText(yInfo, &textRect, DT_SINGLELINE | DT_BOTTOM | DT_RIGHT); } // 显示网格 if (pDoc->m_WillShowGrid) { CPen pen(PS_DOT, 1, RGB(100, 100, 100)); //创建笔，虚线，并调整坐标颜色灰色 CPen *pOldPen = (CPen *)pDC->SelectObject(&pen); for (nX = nLeft+50; nX < nRight; nX += 50) { pDC->MoveTo(nX, nTop); pDC->LineTo(nX, nButton); } for (nY = nButton - 50; nY > nTop; nY -= 50) { pDC->MoveTo(nLeft, nY); pDC->LineTo(nRight, nY); } pDC->SelectObject(pOldPen); } // 显示坐标轴 if (pDoc->m_WillShowAxis) { CPen pen(PS_SOLID, 2, RGB(0, 0, 0)); CPen* pOldPen = (CPen*)pDC->SelectObject(&pen); int oX = FPxtoLPx(0); int oY = FPytoLPy(0); bool showY = oX >= nLeft && oX <= nRight; bool showX = oY >= nTop && oY <= nButton;//判断x,y轴是否在范围内 if (showX) { pDC->MoveTo(nLeft - 10, oY); pDC->LineTo(nRight + 10, oY); } if (showY) { pDC->MoveTo(oX, nButton + 10); pDC->LineTo(oX, nTop - 10); } if (showX && showY) { pDC->TextOutW(oX + 1, oY + 1, _T("O")); } if (showX) { pDC->MoveTo(nRight + 10, oY); pDC->LineTo(nRight + 5, oY + 5); pDC->MoveTo(nRight + 10, oY); pDC->LineTo(nRight + 5, oY - 5); pDC->TextOutW(nRight + 10, oY, _T("X轴")); } if (showY) { pDC->MoveTo(oX, nTop - 10); pDC->LineTo(oX - 5, nTop - 5); pDC->MoveTo(oX, nTop - 10); pDC->LineTo(oX + 5, nTop - 5); pDC->TextOutW(oX + 5, nTop - 10, _T("Y轴")); } pDC->SelectObject(pOldPen); } POSITION p = pDoc->m_List.GetHeadPosition(); int showTop = nTop; while (p != nullptr) { bool shouldMov = true;//一段曲线第一个点MoveTo，其他都是LineTo FuncData* tmpFD = (FuncData*)pDoc->m_List.GetNext(p); CPen pen(tmpFD->m_penType, tmpFD->m_penWidth, tmpFD->m_color); CPen* pOldPen = (CPen*)pDC->SelectObject(&pen); if (tmpFD->FuncCas == CAS_NORMAL) {//动态X坐标模式下，普通函数x范围与视图不同时自动同步 if (pDoc->m_ForceXrange && isMoving!=2) if (tmpFD->minX != m_Xmin || tmpFD->maxX != m_Xmax) { tmpFD->minX = m_Xmin; tmpFD->maxX = m_Xmax; tmpFD->CalcList(); } } for (auto dot : tmpFD->vetPoint) { if (dot.first < m_Xmin || dot.first > m_Xmax || dot.second < m_Ymin || dot.second > m_Ymax || dot.second != dot.second) { shouldMov = true; continue; } if (shouldMov) { pDC->MoveTo(FPxtoLPx(dot.first), FPytoLPy(dot.second)); shouldMov = false; } else pDC->LineTo(FPxtoLPx(dot.first), FPytoLPy(dot.second)); } pDC->MoveTo(nRight+5, showTop);//显示图例 pDC->LineTo(rect.right, showTop); showTop += 5; if (tmpFD->FuncCas == CAS_NORMAL) pDC->TextOutW(nRight + 5, showTop, _T("f(x)=")+tmpFD->m_Equation); else if (tmpFD->FuncCas == CAS_POLAR) pDC->TextOutW(nRight + 5, showTop, _T("r(t)=") + tmpFD->m_Equation); else if (tmpFD->FuncCas == CAS_TWO) { pDC->TextOutW(nRight + 5, showTop, _T("x(t)=") + tmpFD->m_Equation); showTop += 20; pDC->TextOutW(nRight + 5, showTop, _T("y(t)=") + tmpFD->GetEquation2()); } else if (tmpFD->FuncCas == CAS_DATA) pDC->TextOutW(nRight + 5, showTop, _T("y(t)=") + tmpFD->m_Equation); showTop += 25; pDC->SelectObject(pOldPen); } } // CmfcplotView 打印 BOOL CmfcplotView::OnPreparePrinting(CPrintInfo* pInfo) { // 默认准备 return DoPreparePrinting(pInfo); } void CmfcplotView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: 添加额外的打印前进行的初始化过程 } void CmfcplotView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/) { // TODO: 添加打印后进行的清理过程 } // CmfcplotView 诊断 #ifdef _DEBUG void CmfcplotView::AssertValid() const { CView::AssertValid(); } void CmfcplotView::Dump(CDump