MFC straight line dotted line circle oval rectangular arc

* *** Add the DLG. h header file:

// Add the paint brush and dot variable array to the project: public: cpen m_pen [5]; cpoint m_point [5]; public: void drawline (CDC * PDC ); void drawpolyline (CDC * PDC); void drawpolygon (CDC * PDC); void drawrect (CDC * PDC); void drawroundrect (CDC * PDC); void drawellipse (CDC * PDC ); void drawarc (CDC * PDC); void drawanglearc (CDC * PDC );

* *** Modify the DLG. cpp constructor:

Clinetestdlg: clinetestdlg (cwnd * pparent/* = NULL */): cdialogex (clinetestdlg: IDD, pparent) {m_hicon = afxgetapp ()-> loadicon (idr_mainframe ); // initialize the paint brush and dot variable array m_pen [0]. createpen (ps_solid, 1, RGB (255, 0, 0); // red solid line, 1 pixel width --- parameter: style, width, color m_pen [1]. createpen (ps_solid, 6, RGB (0,255, 0); // green solid line, 6 pixels wide m_pen [2]. createpen (ps_dash, 1, RGB (255, 0, 0); // The red dotted line, which must be a pixel width m_pen [3]. createpen (ps_dot, 1, RGB (255,); // blue dot line, which must be a pixel width m_pen [4]. createpen (ps_dashdotdot, 1, RGB (255, 0, 0); // red dotted line, must be a pixel width // draw a polygon point array m_point [0]. X = 10; m_point [0]. y = 100; m_point [1]. X = 10; m_point [1]. y = 120; m_point [2]. X = 100; m_point [2]. y = 105; m_point [3]. X = 170; m_point [3]. y = 120; m_point [4]. X = 170; m_point [4]. y = 100 ;}

* ** DLG. cpp onpaint Function

Void clinetestdlg: onpaint () {cpaintdc DC (this); // The device context cbrush brush (RGB (190,190,190) used for painting; // The image brush DC. selectObject (& brush); // select dcdrawline (& DC); drawpolyline (& DC); drawpolygon (& DC); drawrect (& DC ); drawroundrect (& DC); drawellipse (& DC); drawarc (& DC); drawanglearc (& DC); If (isiconic () {cpaintdc (this ); // The device context sendmessage (wm_iconerasebkgnd, reinterpret_cast <wparam> (DC. getsafehdc (), 0); // center the icon in the rectangle of the workspace int cxicon = getsystemmetrics (sm_cxicon); int cyicon = getsystemmetrics (sm_cyicon); crect rect; getclientrect (& rect); int x = (rect. width ()-cxicon + 1)/2; int y = (rect. height ()-cyicon + 1)/2; // draw the icon DC. drawicon (X, Y, m_hicon);} else {cdialogex: onpaint ();}}

Define plotting functions:

// Draw the line function void clinetestdlg: drawline (CDC * PDC) {cpen * oldpen = PDC-> SelectObject (& m_pen [0]); // Save the original DC paint brush for (INT I = 0; I <5; I ++) {PDC-> SelectObject (& m_pen [I]); // select dcpdc-> moveTo (20, 20 + I * 15) as the paint brush; // set the current DC point PDC-> lineto (170,20 + I * 15 ); // draw a straight line} PDC-> SelectObject (oldpen); // restore the original DC paint brush} // draw the line void clinetestdlg: drawpolyline (CDC * PDC) {cpen * oldpen = PDC-> SelectObject (& m_pen [0]); // Save the original DC paint brush for (INT I = 0; I <5; I ++) {for (Int J = 0; j <5; j ++) {m_point [J]. Y + = 35; // 35 pixels down each time} PDC-> SelectObject (& m_pen [I]); PDC-> polyline (m_point, 5 );} PDC-> SelectObject (oldpen);} // draw the polygon void clinetestdlg: drawpolygon (CDC * PDC) {for (Int J = 0; j <5; j ++) m_point [J]. Y + = 75; // the point in the array moves down 75 pixels cpen * oldpen = PDC-> SelectObject (& m_pen [0]); // Save the original DC paint brush for (INT I = 0; I <5; I ++) {for (Int J = 0; j <5; j ++) {m_point [J]. Y + = 35; // 35 pixels down each drawing} PDC-> SelectObject (& m_pen [I]); PDC-> polygon (m_point, 5 ); // draw polygon} PDC-> SelectObject (oldpen);} // draw the rectangle void clinetestdlg: drawrect (CDC * PDC) {crect rect (, 20 ); cpen * oldpen = PDC-> SelectObject (& m_pen [0]); For (INT I = 0; I <5; I ++) {rect. offsetrect (80, 0); // right shift of each drawing 80 pixels PDC-> SelectObject (& m_pen [I]); PDC-> rectangle (& rect ); // draw rectangle} PDC-> SelectObject (oldpen);} // draw the rounded rectangle void clinetestdlg: drawroundrect (CDC * PDC) {crect rect (150,150,220,230 ); cpen * oldpen = PDC-> SelectObject (& m_pen [0]); For (INT I = 0; I <5; I ++) {rect. offsetrect (); // each drawing shifts 80 pixels to the right of PDC-> SelectObject (& m_pen [I]); PDC-> roundrect (& rect, cpoint ));} PDC-> SelectObject (oldpen);} // draw the Oval void clinetestdlg: drawellipse (CDC * PDC) {crect rect (150,260,220,310 ); cpen * oldpen = PDC-> SelectObject (& m_pen [0]); For (INT I = 0; I <5; I ++) {rect. offsetrect (80, 0); PDC-> SelectObject (& m_pen [I]); PDC-> ellipse (& rect);} PDC-> SelectObject (oldpen );} // draw the arc void clinetestdlg: drawarc (CDC * PDC) {crect rect (150,400,220,460); cpoint ptstart (170,440); cpoint ptend (210,400 ); cpen * oldpen = PDC-> SelectObject (& m_pen [0]); For (INT I = 0; I <5; I ++) {rect. offsetrect (80, 0); ptstart + = cpoint (80, 0); ptend + = cpoint (80, 0); PDC-> SelectObject (& m_pen [I]); PDC-> arc (& rect, ptstart, ptend);} PDC-> SelectObject (oldpen);} // draw a straight line and an arc void clinetestdlg: drawanglearc (CDC * PDC) {crect rect (150,500,220,560); cpoint ptcenter (185,600); cpoint ptstart (150,630); int r = 30; float anglestart = 0; float angleend = 180; cpen * oldpen = PDC-> SelectObject (& m_pen [0]); For (INT I = 0; I <5; I ++) {rect. offsetrect (80, 0); ptstart + = cpoint (80, 0); PDC-> moveTo (ptstart); PDC-> SelectObject (& m_pen [I]); PDC-> anglearc (ptcenter. x, ptcenter. y, R, anglestart, angleend);} PDC-> SelectObject (oldpen );}

Running effect: