gdi+学习笔记

RECT rect;
	//获得客户区坐标
	GetClientRect(&rect);
	//Graphics作图对象
	Graphics g(m_hWnd);

画线：

Pen pen(Color(255, 0, 0, 0));
	g.DrawLine(&pen, rect.left, rect.top, rect.right, rect.bottom);
	g.DrawLine(&pen, rect.left, rect.bottom, rect.right, rect.top);

画字符串：

//画字符串
	SolidBrush brush(Color(255, 0, 0, 255));
	FontFamily fontFamily(TEXT("Times New Roman"));
	Font font(&fontFamily, 24, FontStyleRegular, UnitPixel);
	PointF pt(10.0f, 10.0f);
	g.DrawString(L"Hello World", -1, &font, pt, &brush);

画矩形：

Pen pen(Color(255, 0, 255, 0));
	while (rect.left < rect.right && rect.top < rect.bottom)
	{
		g.DrawRectangle(&pen, rect.left, rect.top, rect.right, rect.bottom);
		rect.left += 5;
		rect.top += 5;
		rect.right -= 10;
		rect.bottom -= 10;
	}

填充区域：

//填充矩形
	SolidBrush brush(Color(255, 0, 255, 0));
	brush.SetColor(Color(255, 0, 0, 255));
	g.FillRectangle(&brush, rect.left, rect.top, rect.right, rect.bottom);

MainDlg.h

// MainDlg.h : interface of the CMainDlg class
//
/////////////////////////////////////////////////////////////////////////////

#pragma once

class CMainDlg : public CDialogImpl<CMainDlg>
{
public:
	enum { IDD = IDD_MAINDLG };

	BEGIN_MSG_MAP(CMainDlg)
		MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)
		MESSAGE_HANDLER(WM_PAINT, OnPaint)
		COMMAND_ID_HANDLER(IDCANCEL, OnCancel)
	END_MSG_MAP()

//  Handler prototypes (uncomment arguments if needed):
//	LRESULT MessageHandler(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
//	LRESULT CommandHandler(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
//	LRESULT NotifyHandler(int /*idCtrl*/, LPNMHDR /*pnmh*/, BOOL& /*bHandled*/)

	LRESULT OnInitDialog(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/);
	LRESULT OnCancel(WORD /*wNotifyCode*/, WORD wID, HWND /*hWndCtl*/, BOOL& /*bHandled*/);
	LRESULT OnPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/);
};

MainDlg.cpp

// MainDlg.cpp : implementation of the CMainDlg class
//
/////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "resource.h"
#include "MainDlg.h"
#include <atlimage.h>
#include <time.h>
#include <gdiplus.h>
#pragma comment (lib,"Gdiplus.lib")
using namespace Gdiplus;
ULONG_PTR gdiplusToken;

LRESULT CMainDlg::OnInitDialog(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
	// center the dialog on the screen
	CenterWindow();

	// set icons
	HICON hIcon = AtlLoadIconImage(IDR_MAINFRAME, LR_DEFAULTCOLOR, ::GetSystemMetrics(SM_CXICON), ::GetSystemMetrics(SM_CYICON));
	SetIcon(hIcon, TRUE);
	HICON hIconSmall = AtlLoadIconImage(IDR_MAINFRAME, LR_DEFAULTCOLOR, ::GetSystemMetrics(SM_CXSMICON), ::GetSystemMetrics(SM_CYSMICON));
	SetIcon(hIconSmall, FALSE);

	GdiplusStartupInput gdiplusStartupInput;
	GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

	return TRUE;
}

LRESULT CMainDlg::OnCancel(WORD /*wNotifyCode*/, WORD wID, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
	EndDialog(wID);
	GdiplusShutdown(gdiplusToken);
	return 0;
}

LRESULT CMainDlg::OnPaint(UINT /*uMsg*/, WPARAM /*wParam*/, LPARAM /*lParam*/, BOOL& /*bHandled*/)
{
/*
	srand((unsigned)time(NULL));
	CPaintDC dc(this->m_hWnd);
	CBrush brush;
	CRect rect;
	GetClientRect(&rect);
	InvalidateRect(&rect, FALSE);
	brush.CreateSolidBrush(RGB(rand() % 255, rand() % 255, rand() % 255));
	dc.FillRect(&rect, brush);
*/

	RECT rect;
	//获得客户区坐标
	GetClientRect(&rect);
	//Graphics作图对象
	Graphics g(m_hWnd);


	//画线
	//Pen pen(Color(255, 0, 0, 0));
	//g.DrawLine(&pen, rect.left, rect.top, rect.right, rect.bottom);
	//g.DrawLine(&pen, rect.left, rect.bottom, rect.right, rect.top);

	//画字符串
	/*
	SolidBrush brush(Color(255, 0, 0, 255));
	FontFamily fontFamily(TEXT("Times New Roman"));
	Font font(&fontFamily, 24, FontStyleRegular, UnitPixel);
	PointF pt(10.0f, 10.0f);
	g.DrawString(L"Hello World", -1, &font, pt, &brush);
	*/

	//画矩形
	Pen pen(Color(255, 0, 255, 0));
	while (rect.left < rect.right && rect.top < rect.bottom)
	{
		g.DrawRectangle(&pen, rect.left, rect.top, rect.right, rect.bottom);
		rect.left += 5;
		rect.top += 5;
		rect.right -= 10;
		rect.bottom -= 10;
	}

	//填充矩形

	SolidBrush brush(Color(255, 0, 255, 0));
	brush.SetColor(Color(255, 0, 0, 255));
	g.FillRectangle(&brush, rect.left, rect.top, rect.right, rect.bottom);
	
	return TRUE;
}