C++的GDI+编程

tamashii

2. #include <stdio.h>
3. #include <windows.h>
4. #include <gdiplus.h>
6. using namespace Gdiplus;
8. HWND g_hWnd;
9. Graphics * graphics;
10. Bitmap * bitmap;
11. Graphics * g_pGraphics;
13. HDC hDC;
14. GdiplusStartupInput gdiplusStartupInput;
15. ULONG_PTR GdiToken;
17. char title[255];
19. int screenwidth = 640;
20. int screenheight = 480;
23. int x = 0, y = 0, a = 0;
25. LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
26. void Render();
27. void OnMouseMove(WPARAM wParam, LPARAM lParam);
29. int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) {
30.     WNDCLASS wndclass;
31.     wndclass.cbClsExtra = 0;
32.     wndclass.cbWndExtra = 0;
33.     wndclass.hbrBackground = (HBRUSH)(COLOR_3DFACE + 1);
34.     wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
35.     wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
36.     wndclass.hInstance = hInstance;
37.     wndclass.lpfnWndProc = WndProc;
38.     wndclass.lpszClassName = "DLMEngine";
39.     wndclass.lpszMenuName = NULL;
40.     wndclass.style = CS_HREDRAW | CS_VREDRAW;
41.     RegisterClass(&wndclass);
42.     int x, y, width, height;
43.     GetPrivateProfileString("Engine",  "Title", "Untitled", title, 255, ".\\Config.ini");
44.     width = GetSystemMetrics(SM_CXDLGFRAME) * 2 + screenwidth;
45.     height = GetSystemMetrics(SM_CYDLGFRAME) * 2 + screenheight + GetSystemMetrics(SM_CYCAPTION);
46.     x = (GetSystemMetrics(SM_CXSCREEN) - width) / 2;
47.     y = (GetSystemMetrics(SM_CYSCREEN) - height) / 2;
48.     g_hWnd = CreateWindow("DLMEngine", title, WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX, x, y, width, height, NULL, NULL, hInstance, NULL);
49.     GdiplusStartup(&GdiToken, &gdiplusStartupInput,NULL);
50.     hDC = GetDC(g_hWnd);
51.     g_pGraphics = new Graphics(hDC);
52.     bitmap = new Bitmap(screenwidth, screenheight);
53.     graphics = Graphics::FromImage(bitmap);
54.     graphics->SetTextRenderingHint(TextRenderingHintAntiAlias);
55.     ShowWindow(g_hWnd, SW_SHOWNORMAL);
56.     MSG msg;
57.     while(true) {
58.         if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
59.             if (msg.message == WM_QUIT) {
60.                 break;
61.             }
62.             Render();
63.             TranslateMessage(&msg);
64.             DispatchMessage(&msg);
65.         }
66.     }
67.     ReleaseDC(g_hWnd, hDC);
68.     GdiplusShutdown(GdiToken);
69.     return 0;
70. }
72. LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
73.     switch(uMsg) {
74.         case WM_PAINT :
75.             Render();
76.             return 0;
77.         case WM_MOUSEMOVE :
78.             OnMouseMove(wParam, lParam);
79.             return 0;
80.         case WM_DESTROY :
81.             PostQuitMessage(0);
82.             return 0;
83.         default :
84.             return DefWindowProc(hWnd, uMsg, wParam, lParam);
85.     }
86. }
88. void Render() {
89.     Font * font = new Font(L"SimHei", 18);
90.     graphics->Clear(Color::Black);
91.     graphics->DrawString(L"文字测试", 4, font, PointF(x, y), new SolidBrush(Color::White));
92.     g_pGraphics->DrawImage(bitmap, 0, 0);
93. }
95. void OnMouseMove(WPARAM wParam, LPARAM lParam) {
96.     x = LOWORD(lParam);
97.     y = HIWORD(lParam);
98.     a = wParam;
99. }

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需要用到库文件 gdipluse.lib

shawind

可惜，主程序的结构还是标准的win app结构，没有为游戏特别优化啊。

inffu

用来画一个主窗体吗？

tamashii

我先来说一下 GDI+ 的特点：
1.支持含有 Alpha 通道的32位图片（例如png）
2.全部面向对象的编程方式
3.支持双缓冲的画面（用一个Bitmap来做后台）
4.图片操作更加方便

shawind

是啊，很多绘图形的工具都用GDI+来作了。唯一的不足就是没有硬件加速，作大动态游戏还是有点缺陷。DX11里新加了个D2D，当然比GDI+快那是肯定的，不知道比起GDI+来是否方便。