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python画图程序，画红心和其他的图案，还有桌面显示的代码。

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我在dialog 的 button 中写入下列代码。但没有画出来。rn CRect l;rn l.left=0;rn l.top=0;rn l.right=90;rn l.bottom=90;rnrn CDC *dc=this->GetDC();rn CDC memdc;rn CBrush brBackground(RGB(34,0,196));rnrn memdc.CreateCompatibleDC(dc);rn memdc.FillRect(l, &brBackground);rnrn dc->BitBlt(0,0,90,90,&memdc,0,0,SRCCOPY);rn rn ReleaseDC(dc);rn ReleaseDC(&memdc);rn

为什么还是画不出来

Bitmap bm=new Bitmap(200,200); rn Pen blackPen = new Pen(Color.Black, 6);rn Graphics g=Graphics.FromImage(bm);rn g.DrawEllipse(blackPen, 1,1,100,100);rn

画图工具画不出来，求教！

/************************************************************************************************************/rnpublic class DrawMain extends JFramern //Main Methodrn public static void main(String[] args) rn J_ButtonPanel btPanel = new J_ButtonPanel();rn J_PaintingGround ptGround = new J_PaintingGround(btPanel);rn DrawMain app = new DrawMain(btPanel, ptGround);rnrn app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);rn app.setSize(600, 600);rn app.setVisible(true);rn rn //设置显示外观rn tryrn UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());rn catch(Exception e) rn e.printStackTrace();rn rn rn rn //构造函数rn public DrawMain(J_ButtonPanel btPanel, J_PaintingGround ptGround) rn //设置容器及容器的整体布局rn super("画板例程");rn Container cp = getContentPane();rnrn cp.add(btPanel.getPanel(),BorderLayout.WEST);rn cp.add(ptGround, BorderLayout.CENTER);rn rnrn/************************************************************************************************************/rnpublic class J_ButtonPanel extends JPanel implements ActionListenerrn private int optype = 0; //操作类型变量，默认值为0rn private JPanel buttonPanel = new JPanel(); //按钮版rn public JPanel getPanel()return buttonPanel; //获取按钮版rn public int getOptype()return optype; //获取操作类型rn J_ButtonPanel() rn //新建按钮rn btFree = new JButton("随手画");rn btLine = new JButton("直线");rn btRectangle = new JButton("矩形");rn btRound = new JButton("圆");rn btEllipse = new JButton("椭圆");rn btFill = new JButton("填充");rn btSave = new JButton("保存");rn btOpen = new JButton("打开");rn //添加按钮rn buttonPanel.add(btOpen);rn buttonPanel.add(btSave);rn buttonPanel.add(btFree);rn buttonPanel.add(btLine);rn buttonPanel.add(btRectangle);rn buttonPanel.add(btRound);rn buttonPanel.add(btEllipse);rn buttonPanel.add(btFill);rn rnrn public void actionPerformed(ActionEvent event) //鼠标监听器rn Object source = event.getSource(); //获取动作，确定操作类型rn if(source == btFree) optype = 0;rn if(source == btLine) optype = 1;rn if(source == btRectangle) optype = 2;rn if(source == btRound) optype = 3;rn if(source == btEllipse) optype = 4;rn if(source == btFill) optype = 5;rn if(source == btOpen) optype = 6;rn if(source == btSave) optype = 7;rn rnrn private JButton btFree;rn private JButton btLine;rn private JButton btRectangle;rn private JButton btRound;rn private JButton btEllipse;rn private JButton btFill;rn private JButton btSave;rn private JButton btOpen;rnrn/************************************************************************************************************/rnpublic class J_PaintingGround extends JPanelrn public Vector> m_vectorSet = new Vector>(); //设置变量存放笔画rn rn public J_PaintingGround(J_ButtonPanel buttonpanel) //构造函数rn btPanel = buttonpanel; //按钮版rn rn if(btPanel.getOptype() == 0)rn addMouseListener(new MouseAdapter()rn rn public void mousePressed(MouseEvent event)rn rn Vector v = new Vector();rn v.add(btPanel.getOptype());rn v.add(event.getX());rn v.add(event.getY());rn m_vectorSet.add(v);rn rn rn );rn addMouseMotionListener(new MouseMotionListener()rn rn public void mouseMoved(MouseEvent event)rnrn public void mouseDragged(MouseEvent event)rn rn int n = m_vectorSet.size()-1;rn Vector v = new Vector();rn v = m_vectorSet.get(n);rn v.add(event.getX());rn v.add(event.getY());rn repaint();rn rn rn );rn rn if(btPanel.getOptype() >=1 && btPanel.getOptype() <= 4)rn addMouseListener(new MouseAdapter()rn rn Vector v = new Vector();rn public void mousePressed(MouseEvent event)rn rn v.add(btPanel.getOptype());rn v.add(event.getX());rn v.add(event.getY());rn rn public void mouseReleased(MouseEvent event)rn rn v.add(event.getX());rn v.add(event.getY());rn m_vectorSet.add(v);rn repaint();rn rn rn );rn rn if(btPanel.getOptype() == 5)rn if(btPanel.getOptype() == 7)rn tryrn rn FileOutputStream f = new FileOutputStream("绘画作品.txt");rn DataOutputStream fout = new DataOutputStream(f);rn int i,j,m;rn int n = m_vectorSet.size();rn Vector vv = new Vector();rn for(i=0;i v = new Vector();rn Vector vv = new Vector();rnrn for(i=0;i();rn rn else rn f.seek(i*4);rn vv.add(f.readInt());rn rn rn this.repaint();rn rn catch(Exception e)rn rn System.err.println("发生异常：" + e);rn e.printStackTrace();rn rn rn rnrn protected void paintComponent(Graphics g)rn rn g.setColor(Color.YELLOW);rn g.clearRect(0, 0, getWidth(), getHeight());rn Vector v = new Vector();rn Point s, t;rn int i, j, m;rn int n = m_vectorSet.size();rn for(i=0,j=0; i

python 发送告警邮件

经常会遇到人不在程序面前，程序抛出异常时却没法及时处理时，可以通过如下的程序，发送一封告警邮件。 from smtplib import SMTP from email.mime.text import MIMEText from email.header import Header def send_email(SMTP_host, from_addr, password, to_addrs,...

用C#画图，跟画图版差不多

分类的思想，没有多余的代码，打开就能用，仔细阅读对编写图形文件很有好处。

用java画图如何画一个点？

如题

分隔符为什么画不出来？

我在学菜单这一章时，为什么按照书上的样子制分隔符时，在菜单里出现的是下划线，而不是分隔线，这是怎么回事呢。

canvas.drawPath无效，画不出来

canvas.drawPath无效 需要关闭手机的硬件加速 1.在自定义view中 加入 setLayerType(View.LAYER_TYPE_SOFTWARE, null); 2.在清单文件中 ，activity 或者application 中添加 android:hardwareAccelerated="false"

界面画不出来图形

我声明了一个CDC*类变量pBkDc，然后在Onpaint跑以下代码，然后dc.BitBlt SRCCOPY.但无法显示所要的图形。这是为什么呢？rn[code=c]rn CRect rect;rn CClientDC nDC(this);rn CBrush nBrush(RGB(255, 255, 255));rn CPen nPenBk;rn int cx_step, cy_step;rnrn GetClientRect(&rect);rn if (pBkDc->GetSafeHdc() == NULL)rn rn pBkDc->CreateCompatibleDC(&nDC);rn nBkBmp.CreateCompatibleBitmap(&nDC, rect.Width(), rect.Height());rn pBkDc->FillRect(rect, RGB(0, 0, 0));rn rnrn cx_step = rect.Width() /10;rn cy_step = rect.Height() / 10;rnrn if (pBkDc->GetSafeHdc() != NULL)rn rn nPenBk.CreatePen(PS_SOLID, 0, RGB( 150, 150, 50));rn CPen* pOldPen = pBkDc->SelectObject(&nPenBk);rnrn for (int i = 1; i < 10; i ++)rn rn pBkDc->MoveTo(cx_step * i, rect.top);rn pBkDc->LineTo(cx_step * i,rect.bottom);rn pBkDc->MoveTo(rect.left, cy_step * i);rn pBkDc->LineTo(rect.right, cy_step * i);rn rnrn pBkDc->SelectObject(&nBrush);rn pBkDc->DrawEdge(rect, EDGE_BUMP, BF_RECT);rn pBkDc->SelectObject(pOldPen);rn rn[/code]

怎么我用D3D的索引来画三角形画不出来

//顶点缓存和索引缓存的创建和填充rnrnrnHRESULT InitGriphics()rnrn //创建纹理对象rn if( FAILED( D3DXCreateTextureFromFile( g_pd3dDevice, L"texture.jpg", &g_pTexture ) ) )rn rn MessageBox(NULL, L"创建纹理失败", L"Texture.exe", MB_OK);rn return E_FAIL;rn rnrn //顶点数据rn CUSTOMVERTEX g_Vertices[] =rn rn 0, 0, 0.0f, 0.5f, 0.5f, rn -3, 3, 0.0f, 0.0f, 0.0f, rn 0, 3, 0.0f, 0.5f, 0.0f, rn 3, 3, 0.0f, 1.0f, 0.0f, rn 3, 0, 0.0f, 1.0f, 0.5f rnrn ;rn rn //创建顶点缓冲区rn if( FAILED( g_pd3dDevice->CreateVertexBuffer( 4*sizeof(CUSTOMVERTEX),rn 0, D3DFVF_CUSTOMVERTEX,rn D3DPOOL_MANAGED, &g_pVB,NULL ) ) )rn rn return E_FAIL;rn rnrn //填充顶点缓冲区rn VOID* pVertices;rn if( FAILED( g_pVB->Lock( 0, sizeof(g_Vertices), (void**)&pVertices, 0 ) ) )rn return E_FAIL;rn memcpy( pVertices, g_Vertices, sizeof(g_Vertices) );rn g_pVB->Unlock();rnrnrn g_pd3dDevice->CreateIndexBuffer(rn 5 * sizeof(WORD), // 3 indices per trianglern D3DUSAGE_WRITEONLY,rn D3DFMT_INDEX16,rn D3DPOOL_MANAGED,rn &g_pIB,rn NULL);rnrn DWORD* indices;rn g_pIB->Lock(0,0,(void**)&indices,D3DLOCK_DISCARD);rnrn indices[0] = 0;rn indices[1] = 1;rn indices[2] = 2;rn //indices[3] = 3;rnrn g_pIB->Unlock();rnrn return S_OK;rnrnrn//其他代码跳过，上渲染的代码。rnVOID Render()rnrnrn //清空后台缓冲区rn g_pd3dDevice->Clear( 0, NULL, D3DCLEAR_TARGET, D3DCOLOR_XRGB(45, 50, 170), 1.0f, 0 );rn rn //开始在后台缓冲区绘制图形rn if( SUCCEEDED( g_pd3dDevice->BeginScene() ) )rn rn g_pd3dDevice->SetTexture( 0, g_pTexture ); //设置纹理rn g_pd3dDevice->SetStreamSource( 0, g_pVB, 0, sizeof(CUSTOMVERTEX) );rn g_pd3dDevice->SetFVF( D3DFVF_CUSTOMVERTEX );rn g_pd3dDevice->SetIndices(g_pIB);rnrnrn //D3DPT_TRIANGLELISTrn //D3DPT_TRIANGLEFANrn g_pd3dDevice->DrawIndexedPrimitive(rn D3DPT_TRIANGLELIST ,rn 0,rn 0,rn 3,rn 0,rn 1);rn //g_pd3dDevice->DrawPrimitive( D3DPT_TRIANGLELIST , 0, 1);rnrn //结束在后台缓冲区绘制图形rn g_pd3dDevice->EndScene();rn rnrn //将在后台缓冲区绘制的图形提交到前台缓冲区显示rn g_pd3dDevice->Present( NULL, NULL, NULL, NULL );rnrnrn如果我把DrawIndexedPrimitive注释掉，用DrawPrimitive来执行就可以渲染出三角形。rnrn我用的三角形渲染方式是 D3DPT_TRIANGLELIST rnrn谁知道为什么没有画出来啊？rn

用OpenCV画个简单的圆，结果画不出来

rn用OpenCV画个简单的圆，结果画不出来，只能显示原图像，没有圆。问题在哪里？请高手帮忙看看rn[code=c]#include "stdafx.h"rn#include "cv.h"rn#include "highgui.h"rnrnIplImage *image02 =0,*image03 = 0,*image04 = 0;rnrnint _tmain(int argc, _TCHAR* argv[])rnrn const char *filename ="d://Image001.bmp";rn if ((image03 = cvLoadImage(filename,0))==0)//读入图像为灰度图像rn rn return -1;rn rn rn cvNamedWindow("Source",1);rn cvShowImage("Source",image03);rn CvPoint centerpoint;rn centerpoint.x =100;rn centerpoint.y =200; rn cvCircle(image03,centerpoint,30,CV_RGB(255,255,255),3,8,1); //画圆，结果显示不出来rn cvWaitKey(0);rn cvReleaseImage(&image03);rn cvDestroyWindow("Source");rn return 0;rn rn[/code]

VS 环境创造不出来

求大神 解决  项目“hello”无法加载，因为它缺少安装组件。若要解决此问题，请使用以下选择启动 Visual Studio 安装程序:Microsoft.VisualStudio.Component.VC.Tools.x86.x64                这是那个组件...

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