C++ DirectD2D

第一章 绘制简单图形rectangle、round rectangle、ellipse、triangle、circle、line

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前言

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提示：以下是本篇文章正文内容，下面案例可供参考

一、头文件引用

#pragma comment (lib,"D2d1.lib")
#include <windows.h>
#include <d2d1.h>
#include <tchar.h>

二、头文件声明

我这只是简单处理了一下，封装做的并不是很好，只是为了练习。

struct WndClass {

	LPCTSTR plClassName;
	LPCTSTR lpWindowName;
	UINT dwStyle;
	INT x;
	INT y;
	INT nWidth;
	INT nHeight;
} m_wndClass
{
	_T("lesson001"),
	_T("lesson001"),
	WS_CAPTION | WS_VISIBLE | WS_SYSMENU,
	100,
	100,
	800,
	600

};
class MainApp
{
public:
	ID2D1Factory* pD2D1Factory = NULL; //D2D工厂
	ID2D1HwndRenderTarget* pRenderTarget = NULL;//渲染
	ID2D1SolidColorBrush* pBlackBrush = NULL;//创建一个刷子
	RECT rc;//Render area
	HWND m_Hwnd;//window handler
	HRESULT hr;

	VOID CleanUp();
	HRESULT OnRender();
};

三、绘制处理

Win32创建窗口步骤和D2D工厂构造：

MainApp mainApp;
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsgId, WPARAM wParam, LPARAM lParam) {
	PAINTSTRUCT ps;
	switch (uMsgId)
	{
	case WM_CREATE:
	{

	}
	break;
	case WM_PAINT:
	case WM_DISPLAYCHANGE:
	{
		BeginPaint(hWnd, &ps);

		mainApp.OnRender();

		EndPaint(hWnd, &ps);
	}
	break;
	case WM_CLOSE:
	{
		if (MessageBox(hWnd, _T("Do you want to quit?"), _T("tip"), MB_YESNO | MB_ICONQUESTION) == IDYES)
		{
			PostQuitMessage(0);
		}
	}
	break;
	case WM_DESTROY:
	{



	}
	break;
	case WM_QUIT:
	{

	}
	break;
	default:
		return DefWindowProc(hWnd, uMsgId, wParam, lParam);
	}
}

int WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPSTR lpCmdLine, _In_ int nShowCmd) {



	WNDCLASS wnd;
	wnd.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
	wnd.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wnd.hInstance = hInstance;
	wnd.lpfnWndProc = WndProc;
	wnd.lpszClassName = m_wndClass.plClassName;
	wnd.style = NULL;
	wnd.hCursor = LoadCursor(NULL, IDC_ARROW);
	wnd.cbClsExtra = NULL;
	wnd.cbWndExtra = NULL;
	wnd.lpszMenuName = NULL;

	//注册窗口类
	if (!RegisterClass(&wnd))
	{
		MessageBox(NULL, "Register window class is failed!", _T("tip"), MB_OK | MB_ICONERROR);
		return 0;
	}

	//创建窗口
	HWND hwnd = CreateWindow(
		m_wndClass.plClassName,
		m_wndClass.lpWindowName,
		m_wndClass.dwStyle,
		m_wndClass.x,
		m_wndClass.y,
		m_wndClass.nWidth,
		m_wndClass.nHeight,
		NULL,
		NULL,
		hInstance,
		0
	);
	if (!hwnd)
	{
		MessageBox(NULL, "Create window is failed!", _T("tip"), MB_OK | MB_ICONERROR);
		return 0;
	}
	mainApp.m_Hwnd = hwnd;



	//构造 D2D工厂
	mainApp.hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &mainApp.pD2D1Factory);

	if (FAILED(mainApp.hr))
	{
		MessageBox(hwnd, "Create D2D factory failed!", _T("tip"), MB_OK | MB_ICONERROR);
		return 0;
	}
	GetClientRect(mainApp.m_Hwnd, &mainApp.rc);
	//创建渲染句柄
	mainApp.hr = mainApp.pD2D1Factory->CreateHwndRenderTarget(
		D2D1::RenderTargetProperties(),
		D2D1::HwndRenderTargetProperties(
			hwnd,
			D2D1::SizeU(mainApp.rc.right - mainApp.rc.left, mainApp.rc.bottom - mainApp.rc.top)
		),
		&mainApp.pRenderTarget
	);
	if (FAILED(mainApp.hr))
	{
		MessageBox(hwnd, _T("Create Hwnd render target failed!"), _T("tip"), MB_OK | MB_ICONERROR);
		return 0;
	}
	//创建笔刷
	mainApp.hr = mainApp.pRenderTarget->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::Red), &mainApp.pBlackBrush);
	if (FAILED(mainApp.hr))
	{
		MessageBox(hwnd, _T("Create brush failed!"), _T("tip"), MB_OK | MB_ICONERROR);
		return 0;
	}
	//展示窗口
	ShowWindow(hwnd, SW_NORMAL);
	//更新窗口
	UpdateWindow(hwnd);

	//派发消息
	MSG msg{ 0 };
	while (true)
	{
		if (PeekMessage(&msg, hwnd, 0, 0, PM_REMOVE))
		{
			if (msg.message == WM_QUIT)
			{
				break;
			}
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}


	mainApp.CleanUp();

	UnregisterClass(m_wndClass.plClassName, hInstance);
	return 0;
}






HRESULT MainApp::OnRender()
{

	//绘制图形


	mainApp.pRenderTarget->BeginDraw();

	//clear background color white
	mainApp.pRenderTarget->Clear(D2D1::ColorF(D2D1::ColorF::White));


	//draw rectangle
	mainApp.pRenderTarget->DrawRectangle(D2D1::RectF(100.0f, 100.0f, 200.0f, 200.0f), mainApp.pBlackBrush);


	// draw round rectangle
	mainApp.pRenderTarget->DrawRoundedRectangle(D2D1::RoundedRect(D2D1::RectF(300.0f, 300.0f, 400.0f, 400.0f), 30.0f, 30.0f), mainApp.pBlackBrush);


	//draw ellipse
	mainApp.pRenderTarget->DrawEllipse(D2D1::Ellipse(D2D1::Point2F(150, 55), 50, 30), pBlackBrush);

	//draw triangle.
	D2D1_POINT_2F p0{30,10};
	D2D1_POINT_2F p1{20,40};
	D2D1_POINT_2F p2{40,40};
	mainApp.pRenderTarget->DrawLine(p0, p1, pBlackBrush);
	mainApp.pRenderTarget->DrawLine(p1, p2, pBlackBrush);
	mainApp.pRenderTarget->DrawLine(p2, p0, pBlackBrush);

	//draw Circle,same as radius
	mainApp.pRenderTarget->DrawEllipse(D2D1::Ellipse(D2D1::Point2F(150, 55), 50, 50), pBlackBrush);

	//set line stronger
	mainApp.pRenderTarget->DrawLine(D2D1_POINT_2F{ 10,7 }, D2D1_POINT_2F{ 100,7 }, pBlackBrush, 10);




	mainApp.hr = mainApp.pRenderTarget->EndDraw();

	if (FAILED(mainApp.hr))
	{
		MessageBox(mainApp.m_Hwnd, _T("Draw failed!"), _T("tip"), MB_OK | MB_ICONERROR);
	}
	//结束绘制
	return mainApp.hr;
}

VOID MainApp::CleanUp() {

	SAFE_RELEASE(pRenderTarget);
	SAFE_RELEASE(pBlackBrush);
	SAFE_RELEASE(pD2D1Factory);
}

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总结

提示：以上就是今天要讲的内容，本文仅仅简单介绍了DirectD2D的使用，DirectD2D还有很多要学习掌握的东西，这点东西还远远不够呢。