D2dengine edible tutorial (4) -- draw text

D2DEngine Library links ：Direct2D Of C++ Self made auxiliary Library ———D2DEngine ( Continuous updating )

The goal is ： Draw text

Because it didn't come true GIF Dynamic map export can only use other software …

Not much to say , Code up
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D2DEngine Member functions	effect
bool ChangeTextFormat(FontSize,TextColor,FontFamilyName);	Change text style , Set monochrome text , Parameters ：FontSize font size ,TextColor The font color ,FontFamilyName Font cluster , Such as " Microsoft YaHei "“ Song style " etc. , Default " NSimSun ”. If the font cluster cannot be found, the system default font will be used ( Not going to happen COM error )
void DrawText(text,x,y,width,height);	( Rendering ) Draw monochrome text , Parameters ：text Text ,x,y Relative to the render target Start coordinates of ,width Text drawing area Width of ,height The height of the text drawing area , If the text exceeds the drawing area , Will open up space to draw down or right

D2DDrawText.CPP

#include<windows.h>

#include"D2D_DRAW.h"

using namespace D2D1;



LRESULT CALLBACK CallBackFunc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    
	switch (message)
	{
    

	case WM_DESTROY:
		PostQuitMessage(0);
		break;

	default:
		return DefWindowProc(hwnd, message, wParam, lParam);
	}

	return 0;
}


int WINAPI WinMain(HINSTANCE hin, HINSTANCE, LPSTR, int CmdShow)
{
    

	MSG msg = {
    };
	WNDCLASSEX wcex = {
    };

	memset(&wcex, 0, sizeof(wcex));
	wcex.cbSize = sizeof(WNDCLASSEX);
	wcex.lpfnWndProc = CallBackFunc;
	wcex.lpszClassName = L"D2D";
	wcex.hInstance = hin;
	wcex.style = CS_GLOBALCLASS;
	wcex.hbrBackground = (HBRUSH)GetStockObject(NULL_BRUSH);

	RegisterClassEx(&wcex);

	HWND hwnd = CreateWindowW(wcex.lpszClassName, L"D2D",
		WS_OVERLAPPED | WS_SYSMENU,
		0, 0, 900, 554,
		nullptr,
		nullptr,
		hin,
		nullptr
	);


	ShowWindow(hwnd, CmdShow);






	D2DEngine* Engine = new D2DEngine; // establish D2DEngine object 

	Picture Pic(L" " .jpeg"); // Create a picture object 

	Engine->Initialize(hwnd); // Initialize with handle D2DEngine

	Engine->TransformPictureIntoBitmap(Pic);  // Convert pictures 

	Engine->BeginDraw(); // Start rendering 

	Engine->DrawPicture(Pic, 0, 0, 900, 554); // Draw the picture first 

	Engine->ChangeTextFormat(40, ColorF::White,L" Ye Genyou brush running calligraphy 2.0 edition ");
	// Change text style , Font size: 40, The color is white , Font cluster ( family ) by " Ye Genyou brush running calligraphy 2.0 edition "

	Engine->Drawtext(L" " , Not Wang Chen ", 400, 100, 400, 100); 
	// stay  (400,100,800,200)  Draw text in the area of , Make the text not covered by the picture 

	Engine->EndDraw(); // Stop rendering 






	while (GetMessage(&msg, NULL, 0, 0) > 0)
	{
    
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return msg.wParam;
}

D2DDrawText2.CPP

#include<windows.h>
#include<string>
#include<thread> // Thread library 

#include"D2D_DRAW.h"

using namespace std;
using namespace D2D1;


D2DEngine* Engine;  // overall situation D2DEngine, So that sub threads can use 
Picture Pic(L" The Supreme Master disordered the Han .jpeg");  // Create a picture object 

void D2DThread();  // Provide functions run by sub threads 


LRESULT CALLBACK CallBackFunc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    
	switch (message)
	{
    

	case WM_DESTROY:
		PostQuitMessage(0);
		break;

	default:
		return DefWindowProc(hwnd, message, wParam, lParam);
	}

	return 0;
}


int WINAPI WinMain(HINSTANCE hin, HINSTANCE, LPSTR, int CmdShow)
{
    

	MSG msg = {
    };
	WNDCLASSEX wcex = {
    };

	memset(&wcex, 0, sizeof(wcex));
	wcex.cbSize = sizeof(WNDCLASSEX);
	wcex.lpfnWndProc = CallBackFunc;
	wcex.lpszClassName = L"D2D";
	wcex.hInstance = hin;
	wcex.style = CS_GLOBALCLASS;
	wcex.hbrBackground = (HBRUSH)GetStockObject(NULL_BRUSH);

	RegisterClassEx(&wcex);

	HWND hwnd = CreateWindowW(wcex.lpszClassName, L"D2D",
		WS_OVERLAPPED | WS_SYSMENU,
		0, 0, 1280, 642,
		nullptr,
		nullptr,
		hin,
		nullptr
	);


	ShowWindow(hwnd, CmdShow);





	Engine = new D2DEngine; // establish D2DEngine object 

	Engine->Initialize(hwnd); // Initialize with handle D2DEngine

	Engine->TransformPictureIntoBitmap(Pic);  // Convert pictures 

	thread thread1(D2DThread); // Create child threads 

	thread1.detach();  // Do not block main thread , Let the sub thread run alone 

	



	while (GetMessage(&msg, NULL, 0, 0) > 0)
	{
    
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return msg.wParam;
}


void D2DThread()
{
    
	wstring text(L" DongZhuo Wudao , The emperor's room fell , needless , Failure, , Wait for the heroes of life to help them ");

	float color[3] = {
     1.0f,0.0f,0.0f }; // The font color 
	

	for(size_t i = 0 ; i < text.size(); i++)
	{
    
		color[0] -= 0.03f;
		color[1] += 0.03f;
		color[2] += 0.03f;

		Engine->BeginDraw(); // Start rendering 

		Engine->DrawPicture(Pic, 0, 0, 1280, 642); // Draw the picture first 

		Engine->ChangeTextFormat(40, color, L" Ye Genyou brush running calligraphy 2.0 edition ");
		// Change text style , Font size: 40, The color is white , Font cluster ( family ) by " Ye Genyou brush running calligraphy 2.0 edition "

		Engine->Drawtext(&text.substr(0,i+1)[0],
		75, 400, 1200, 100);
		// stay  (75,400,1200,100)  Draw text in the area of , Make the text not covered by the picture 

		Engine->EndDraw(); // Stop rendering 

		Sleep(200);  // stop it 200 millisecond 
	}
}

Be careful ： Because we used Multithreading , When we click on the window while the program is running , The window will not get stuck and unresponsive , This is because the drawing process is placed in another thread that runs separately , Make the application still have space to process window messages . But you will find , Compiling this code many times will report an error , This is because C++ Standard thread library and Direct2D Are not compatible , Lead to resource conflict in critical areas , Then we will use Microsoft's thread library for D2DEngine Add features that support multithreading , Make its rendering process perfectly compatible .

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