Vẽ Hình Bát Quái

Code:

CBrush * newbrush1=new CBrush(RGB(4500,4500,500));
   CBrush * oldbrush1=pDC->SelectObject(newbrush1);
   pDC->SelectObject(oldbrush1);
   int x1,y1,x2,y2;
   x1=100;
   y1=100;
   x2=500;
   y2=500;
   pDC->MoveTo(x1,y1);
   pDC->Ellipse(x1,y1,x2,y2);//ve hinh tron dau tien
   pDC->MoveTo((x1+x2)/2,y1);
   pDC->AngleArc((x1+x2)/2,(y1+y2)/3,(x1+x2)/6,90,181);//ve nua hinh tron phia tren
   pDC->MoveTo((x1+x2)/2,y2);
   pDC->AngleArc((x1+x2)/2,(y2-y1),(x1+x2)/6,-90,180);//ve nua hinh tron phia duoi (-90)
   pDC->MoveTo((x1+x2)/2,150);
   pDC->SelectObject(newbrush1);
   pDC->AngleArc((x1+x2)/2,(y1+y2)/3,(x1+x2)/12,90,360);//ve hinh tron nho o tren
   pDC->FloodFill(x1+(x2-x1)/2,y1+(y2-y1)/3,RGB(0,0,0));
   pDC->SelectObject(oldbrush1);
   pDC->MoveTo((x1+x2)/2,y2-50);
   pDC->AngleArc((x1+x2)/2,(y2-y1),(x1+x2)/12,-90,360);//ve hinh tron nho o duoi
   pDC->SelectObject(newbrush1);//chon mau
   pDC->FloodFill(x1+(x2-x1)/3,(y1+y2)/2,RGB(0,0,0));//to mau.
   delete newbrush1;//hủy newbrush1
   delete oldbrush1;//hủy oldbrush1


gecko đã viết:Mong pác chỉ rõ ra pác thắc mắc chổ nào em sẽ giải thích

nguyenhuuthanh đã viết:thanks pác nhá,nhưng Thanh vẫn chưa hiểu vì sao có chỗ (x1+x2)/2 có chỗ lại khác?????

Code:


//HINH 1

   //duong tron ngoai
   
   
   pDC->MoveTo(100,300);
   pDC->AngleArc(300,300,200,180,360);
   
   
   
   
   //cung tron tren
   pDC->MoveTo(300,100);
   pDC->AngleArc(300,200,100,90,180);
   //cung tron duoi
   pDC->MoveTo(300,300);
   pDC->AngleArc(300,400,100,90,-180);

   //duong tron tren
   
   pDC->MoveTo(260,180);
   pDC->AngleArc(300,180,40,180,360);

   //duong tron duoi
   pDC->MoveTo(260,420);
   pDC->AngleArc(300,420,40,180,360);

   CBrush *newbrush=new CBrush(RGB(0,0,0));
   CBrush *oldbrush=pDC->SelectObject(newbrush);
   pDC->FloodFill(320,300,RGB(0,0,0));

   //pDC->SelectObject(oldbrush);
   pDC->FloodFill(300,410,RGB(0,0,0));
   

   //HINH 2
   //cung tren
   pDC->MoveTo(800,200);
   pDC->AngleArc(800,300,100,90,-90);
   //cung duoi
   pDC->MoveTo(800,230);
   pDC->AngleArc(800,300,70,90,-90);
   //noi 2 cung
   pDC->MoveTo(800,230);
   pDC->LineTo(800,200);

   pDC->MoveTo(870,300);
   pDC->LineTo(900,300);

   //HINH 3
   //cung tren
   
   pDC->MoveTo(800,400);
   pDC->AngleArc(800,500,100,90,-90);
   //cung duoi
   pDC->MoveTo(800,430);
   pDC->AngleArc(800,500,70,90,-90);
   //tao 2 duong noi
   pDC->MoveTo(800,400);
   pDC->LineTo(800,430);

   pDC->MoveTo(900,500);
   pDC->LineTo(870,500);

   newbrush=new CBrush(RGB(100,200,0));
   pDC->SelectObject(newbrush);
   pDC->FloodFill(810,420,RGB(0,0,0));


Tớ nghĩ pác nên làm một bài mô tả như tớ zị nè
https://07ck2.forumvi.com/forum-f37/topic-t1896.htm

Code:


// dh1.3View.cpp : implementation of the Cdh13View class
//

#include "stdafx.h"
#include "dh1.3.h"
#include "dh1.3Doc.h"
#include "dh1.3View.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// Cdh13View

IMPLEMENT_DYNCREATE(Cdh13View, CView)

BEGIN_MESSAGE_MAP(Cdh13View, CView)
   // 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()

// Cdh13View construction/destruction

Cdh13View::Cdh13View()
{
   // TODO: add construction code here

}

Cdh13View::~Cdh13View()
{
}

BOOL Cdh13View::PreCreateWindow(CREATESTRUCT& cs)
{
   // TODO: Modify the Window class or styles here by modifying
   //  the CREATESTRUCT cs

   return CView::PreCreateWindow(cs);
}

// Cdh13View drawing

void Cdh13View::OnDraw(CDC* pDC)
{
   Cdh13Doc* pDoc = GetDocument();
   ASSERT_VALID(pDoc);
   if (!pDoc)
      return;

   // TODO: add draw code for native data here
   //--------------------Hình 1.Bát Quái:-------------------------
   CBrush * newbrush1=new CBrush(RGB(4500,4500,500));
   CBrush * oldbrush1=pDC->SelectObject(newbrush1);
   pDC->SelectObject(oldbrush1);
   int x1,y1,x2,y2;
   x1=300;
   y1=300;
   x2=600;
   y2=600;
   pDC->MoveTo(x1,y1);
   pDC->Ellipse(x1,y1,x2,y2);//ve hinh tron dau tien
   pDC->MoveTo((x1+x2)/2,y1);
   pDC->AngleArc((x1+x2)/2,y1+(y2-y1)/4,(x2-x1)/4,90,181);//ve nua hinh tron phia tren
   pDC->MoveTo((x1+x2)/2,y2);
   pDC->AngleArc((x1+x2)/2,y2-(y2-y1)/4,(x2-x1)/4,-90,180);//ve nua hinh tron phia duoi (-90)
   pDC->MoveTo((x1+x2)/2,y1+(y2-y1)/8);
   pDC->SelectObject(newbrush1);
   pDC->AngleArc((x1+x2)/2,y1+(y2-y1)/4,(x2-x1)/8,90,360);//ve hinh tron nho o tren
   pDC->FloodFill(x1+(x2-x1)/2,y1+(y2-y1)/3,RGB(0,0,0));
   pDC->SelectObject(oldbrush1);
   pDC->MoveTo((x1+x2)/2,y2-(y2-y1)/8);
   pDC->AngleArc((x1+x2)/2,y2-(y2-y1)/4,(x2-x1)/8,-90,360);//ve hinh tron nho o duoi
   pDC->SelectObject(newbrush1);//chon mau
   pDC->FloodFill(x1+(x2-x1)/3,(y1+y2)/2,RGB(0,0,0));//to mau.
   //delete newbrush1;
   //delete oldbrush1;
   //---------------------------------------------------------

}


// Cdh13View printing

BOOL Cdh13View::OnPreparePrinting(CPrintInfo* pInfo)
{
   // default preparation
   return DoPreparePrinting(pInfo);
}

void Cdh13View::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
   // TODO: add extra initialization before printing
}

void Cdh13View::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
   // TODO: add cleanup after printing
}


// Cdh13View diagnostics

#ifdef _DEBUG
void Cdh13View::AssertValid() const
{
   CView::AssertValid();
}

void Cdh13View::Dump(CDumpContext& dc) const
{
   CView::Dump(dc);
}

Cdh13Doc* Cdh13View::GetDocument() const // non-debug version is inline
{
   ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(Cdh13Doc)));
   return (Cdh13Doc*)m_pDocument;
}
#endif //_DEBUG


// Cdh13View message handlers