// TranslateView.cpp : implementation of the CTranslateView class
//

#include "stdafx.h"
#include "Translate.h"

#include "TranslateDoc.h"
#include "TranslateView.h"

//add down 
#include "gl\gl.h"
#include "gl\glu.h"
//add up

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CTranslateView

IMPLEMENT_DYNCREATE(CTranslateView, CView)

BEGIN_MESSAGE_MAP(CTranslateView, CView)
	//{{AFX_MSG_MAP(CTranslateView)
	ON_WM_CREATE()
	ON_WM_DESTROY()
	ON_WM_SIZE()
	ON_WM_ERASEBKGND()
	//}}AFX_MSG_MAP
	// 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()

/////////////////////////////////////////////////////////////////////////////
// CTranslateView construction/destruction

CTranslateView::CTranslateView()
{
	//add down
	m_pDC = NULL;
	//add up
}

CTranslateView::~CTranslateView()
{
}

BOOL CTranslateView::PreCreateWindow(CREATESTRUCT& cs)
{
	//add down
	cs.style |= WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
	//add up

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CTranslateView drawing

void CTranslateView::OnDraw(CDC* pDC)
{
	CTranslateDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	//add down
	DrawScene();
	//add up
}

/////////////////////////////////////////////////////////////////////////////
// CTranslateView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CTranslateView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CTranslateView message handlers

int CTranslateView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CView::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	//add down
	Init(); // 初始化OpenGL
	//add up
	
	return 0;
}

void CTranslateView::OnDestroy() 
{
	//add down
	HGLRC   hrc;

	hrc = ::wglGetCurrentContext();

	::wglMakeCurrent(NULL,  NULL);

	if (hrc)
		::wglDeleteContext(hrc);

	if (m_pDC)
		delete m_pDC;
	//add up

	CView::OnDestroy();
}

void CTranslateView::OnSize(UINT nType, int cx, int cy) 
{
	CView::OnSize(nType, cx, cy);
	//add down
	int w=cx;
	int h=cy;
	GLfloat nRange=1.0f;
	//避免除數為0
	if(h==0) h=1;

	//設置視口與窗口匹配
	glViewport(0,0,w,h);

	//重新設置坐標系統
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	
	//建立正交變換下的剪切體
	if(w<h)
		glOrtho(-nRange,nRange,-nRange*h/w,nRange*h/w,-nRange,nRange);
	else
		glOrtho(-nRange*w/h,nRange*w/h,-nRange,nRange,-nRange,nRange);
	
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	//add up
}

BOOL CTranslateView::OnEraseBkgnd(CDC* pDC) 
{
	return TRUE;
}

//add down
void CTranslateView::Init()
{
	PIXELFORMATDESCRIPTOR pfd;
	int         n;
	HGLRC       hrc;

	m_pDC = new CClientDC(this);

	ASSERT(m_pDC != NULL);

	if (!bSetupPixelFormat())
		return;

	n = ::GetPixelFormat(m_pDC->GetSafeHdc());
	::DescribePixelFormat(m_pDC->GetSafeHdc(), n, sizeof(pfd), &pfd);

	hrc = wglCreateContext(m_pDC->GetSafeHdc());
	wglMakeCurrent(m_pDC->GetSafeHdc(), hrc);

	glClearDepth(1.0f);
	glEnable(GL_DEPTH_TEST);

}

BOOL CTranslateView::bSetupPixelFormat()
{
	static PIXELFORMATDESCRIPTOR pfd =
	{
		sizeof(PIXELFORMATDESCRIPTOR),  // size of this pfd
		1,                              // version number
		PFD_DRAW_TO_WINDOW |            // support window
		  PFD_SUPPORT_OPENGL |          // support OpenGL
		  PFD_DOUBLEBUFFER,             // double buffered
		PFD_TYPE_RGBA,                  // RGBA type
		24,                             // 24-bit color depth
		0, 0, 0, 0, 0, 0,               // color bits ignored
		0,                              // no alpha buffer
		0,                              // shift bit ignored
		0,                              // no accumulation buffer
		0, 0, 0, 0,                     // accum bits ignored
		32,                             // 32-bit z-buffer
		0,                              // no stencil buffer
		0,                              // no auxiliary buffer
		PFD_MAIN_PLANE,                 // main layer
		0,                              // reserved
		0, 0, 0                         // layer masks ignored
	};
	int pixelformat;

	if ( (pixelformat = ChoosePixelFormat(m_pDC->GetSafeHdc(), &pfd)) == 0 )
	{
		MessageBox("ChoosePixelFormat failed");
		return FALSE;
	}

	if (SetPixelFormat(m_pDC->GetSafeHdc(), pixelformat, &pfd) == FALSE)
	{
		MessageBox("SetPixelFormat failed");
		return FALSE;
	}

	return TRUE;
}

void CTranslateView::DrawScene(void)
{
	//設置清屏顏色為白色
	glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
	//清除顏色緩沖區和深度緩沖區
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	
	//必須要加的矩陣堆棧函數，和glPopMatrix()相對應，具體內容請見下一章
	glPushMatrix();
	
	glColor3f(1.0,0.0,0.0);
	//繪制填充多邊形
	glBegin(GL_POLYGON);
		glVertex2f(-1.0,0.7);
		glVertex2f(-0.8,0.7);
		glVertex2f(-0.8,0.6);
		glVertex2f(-0.9,0.5);
	glEnd();

	//繪制轉換后的填充多邊形
	//向左平移填充多邊形
	glTranslatef(0.5,0.0,0.0);
	//旋轉填充多邊形
	glRotatef(30,1.0,0.0,0.0);
	//壓縮填充多邊形
	glScalef(2.0,1.0,1.0);
	glBegin(GL_POLYGON);
		glVertex2f(-1.0,0.7);
		glVertex2f(-0.8,0.7);
		glVertex2f(-0.8,0.6);
		glVertex2f(-0.9,0.5);
	glEnd();

	glPopMatrix();
	glFinish();
	SwapBuffers(wglGetCurrentDC());
}
//add up