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D2D RPG游戏开发日记（一）
主要是作为自己做的2DRPG游戏日记 采用direct2D vs2015 c++ win32 还在开发中 预计写到3月底应该
简述：
本项目使用D2D API制作一款2DRPG游戏。暂定游戏设计有三个主角，6幅地图（1张城镇，5张迷宫），5幅战斗背景图，100个NPC
D2D如何渲染位图：
参见博客：.html
第零步：C++Win32程序基本结构
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
2. {
3. switch (message)
4. {
5. case WM_PAINT: //Draw
6. if (!pRenderTarget)
7. {
8. CreateResource(hwnd);
9. Form_Load();
10. }
11. else
12. {
13. Begindraw();
14. DrawMap(hwnd, pRenderTarget,map, player,npc,current_player,current_map, animation_ctrl);
15. Enddraw();
16. }
17.
18. return 0;
19.
20. case WM_KEYDOWN:
21. {
22.
23. end = GetTickCount();
24. if (end - start > player[current_player].walk_interval)
25. {
26. start = end;
27. animation_ctrl++;
28. key_ctrl(hwnd, wParam, player, ¤t_player,map,¤t_map,npc);
29. }
30. }
31. break;
32.
33. case WM_DESTROY:
34. Cleanup();
35. PostQuitMessage(0);
36. return 0;
37. }
38.
39. return DefWindowProc(hwnd, message, wParam, lParam);
40. }
41.
42. int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
43. {
44.
45. WNDCLASSEX winClass;
46.
47. winClass.lpszClassName = "Direct2D";
48. winClass.cbSize = sizeof(WNDCLASSEX);
49. winClass.style = CS_HREDRAW | CS_VREDRAW;
50. winClass.lpfnWndProc = WndProc;
51. winClass.hInstance = hInstance;
52. winClass.hIcon = NULL;
53. winClass.hIconSm = NULL;
54. winClass.hCursor = LoadCursor(NULL, IDC_ARROW);
55. winClass.hbrBackground = NULL;
56. winClass.lpszMenuName = NULL;
57. winClass.cbClsExtra = 0;
58. winClass.cbWndExtra = 0;
59.
60. if (!RegisterClassEx(&winClass))
61. {
62. MessageBox(NULL, TEXT("This program requires Windows NT!"), "error", MB_ICONERROR);
63. return 0;
64. }
65.
66. HWND hwnd = CreateWindowEx(NULL,
67. "Direct2D", // window class name
68. "寻仙传", // window caption
69. WS_MAXIMIZE, // window style
70. CW_USEDEFAULT, // initial x position
71. CW_USEDEFAULT, // initial y position
72. 640, // initial x size
73. 480, // initial y size
74. NULL, // parent window handle
75. NULL, // window menu handle
76. hInstance, // program instance handle
77. NULL); // creation parameters
78.
79. ShowWindow(hwnd, iCmdShow);
80. UpdateWindow(hwnd);
81.
82. MSG msg;
83. ZeroMemory(&msg, sizeof(msg));
84.
85. while (GetMessage(&msg, NULL, 0, 0))
86. {
87. TranslateMessage(&msg);
88. DispatchMessage(&msg);
89. }
90.
91. return msg.wParam;
92. } 第一步：创建D2D工厂，画布，WIC工厂
1. VOID CreateResource(HWND hWnd)
2. {
3. HRESULT hr;
4. //创建D2D工厂 D2D1CreateFactory
5. hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &pD2DFactory);
6. if (FAILED(hr))
7. {
8. MessageBox(hWnd, "Create D2D factory failed!", "Error", 0);
9. return;
10. }
11.
12. // Obtain the size of the drawing area
13. RECT rc;
14. GetClientRect(hWnd, &rc);
15.
16. // Create a Direct2D render target
17. hr = pD2DFactory->CreateHwndRenderTarget(
18. D2D1::RenderTargetProperties(),
19. D2D1::HwndRenderTargetProperties(
20. hWnd,
21. D2D1::SizeU(rc.right - rc.left, rc.bottom - rc.top)
22. ),
23. &pRenderTarget
24. );
25. if (FAILED(hr))
26. {
27. MessageBox(hWnd, "Create render target failed!", "Error", 0);
28. return;
29. }
30.
31. // Create WIC factory 用于加载位图
32. hr = CoCreateInstance(
33. CLSID_WICImagingFactory1,
34. NULL,
35. CLSCTX_INPROC_SERVER,
36. IID_IWICImagingFactory,
37. reinterpret_cast<void **>(&pWICFactory)
38. );
39. if (FAILED(hr))
40. {
41. MessageBox(hWnd, "Create render target failed!", "Error", 0);
42. return;
43. }
44. } 第二步：使用WIC从文件中加载位图到ID2D1Bitmap
1. HRESULT LoadBitmapFromFile(
2. ID2D1RenderTarget *pRenderTarget,
3. IWICImagingFactory *pIWICFactory,
4. PCWSTR uri, // 文件的路径
5. UINT destinationWidth,
6. UINT destinationHeight,
7. ID2D1Bitmap **ppBitmap
8. )
9. {
10. HRESULT hr = S_OK;
11.
12. IWICBitmapDecoder *pDecoder = NULL;
13. IWICBitmapFrameDecode *pSource = NULL;
14. IWICStream *pStream = NULL;
15. IWICFormatConverter *pConverter = NULL;
16. IWICBitmapScaler *pScaler = NULL;
17.
18. hr = pIWICFactory->CreateDecoderFromFilename(
19. uri,
20. NULL,
21. GENERIC_READ,
22. WICDecodeMetadataCacheOnLoad,
23. &pDecoder
24. );
25. if (SUCCEEDED(hr))
26. {
27.
28. // Create the initial frame.
29. hr = pDecoder->GetFrame(0, &pSource);
30. }
31.
32. if (SUCCEEDED(hr))
33. {
34. // Convert the image format to 32bppPBGRA
35. // (DXGI_FORMAT_B8G8R8A8_UNORM + D2D1_ALPHA_MODE_PREMULTIPLIED).
36. hr = pIWICFactory->CreateFormatConverter(&pConverter);
37. }
38. if (SUCCEEDED(hr))
39. {
40. // If a new width or height was specified, create an
41. // IWICBitmapScaler and use it to resize the image.
42. if (destinationWidth != 0 || destinationHeight != 0)
43. {
44. UINT originalWidth, originalHeight;
45. hr = pSource->GetSize(&originalWidth, &originalHeight);
46. if (SUCCEEDED(hr))
47. {
48. if (destinationWidth == 0)
49. {
50. FLOAT scalar = static_cast<FLOAT>(destinationHeight) / static_cast<FLOAT>(originalHeight);
51. destinationWidth = static_cast<UINT>(scalar * static_cast<FLOAT>(originalWidth));
52. }
53. else if (destinationHeight == 0)
54. {
55. FLOAT scalar = static_cast<FLOAT>(destinationWidth) / static_cast<FLOAT>(originalWidth);
56. destinationHeight = static_cast<UINT>(scalar * static_cast<FLOAT>(originalHeight));
57. }
58.
59. hr = pIWICFactory->CreateBitmapScaler(&pScaler);
60. if (SUCCEEDED(hr))
61. {
62. hr = pScaler->Initialize(
63. pSource,
64. destinationWidth,
65. destinationHeight,
66. WICBitmapInterpolationModeCubic
67. );
68. }
69. if (SUCCEEDED(hr))
70. {
71. hr = pConverter->Initialize(
72. pScaler,
73. GUID_WICPixelFormat32bppPBGRA,
74. WICBitmapDitherTypeNone,
75. NULL,
76. 0.f,
77. WICBitmapPaletteTypeMedianCut
78. );
79. }
80. }
81. }
82. else // Don't scale the image.
83. {
84. hr = pConverter->Initialize(
85. pSource,
86. GUID_WICPixelFormat32bppPBGRA,
87. WICBitmapDitherTypeNone,
88. NULL,
89. 0.f,
90. WICBitmapPaletteTypeMedianCut
91. );
92. }
93. }
94. if (SUCCEEDED(hr))
95. {
96. // Create a Direct2D bitmap from the WIC bitmap.
97. hr = pRenderTarget->CreateBitmapFromWicBitmap(
98. pConverter,
99. NULL,
100. ppBitmap
101. );
102. }
103.
104. SAFE_RELEASE(pDecoder);
105. SAFE_RELEASE(pSource);
106. SAFE_RELEASE(pStream);
107. SAFE_RELEASE(pConverter);
108. SAFE_RELEASE(pScaler);
109.
110. return hr;
111. } 第三步：开始绘图，结束绘图，释放资源函数
1. VOID Begindraw()
2. {
3. pRenderTarget->BeginDraw();
4. }
5. VOID Enddraw()
6. {
7. HRESULT hr = pRenderTarget->EndDraw();
8. if (FAILED(hr))
9. {
10. MessageBox(NULL, "Draw failed!", "Error", 0);
11.
12. return;
13. }
14. }
15. VOID Cleanup()
16. {
17. SAFE_RELEASE(pWICFactory);
18. SAFE_RELEASE(pRenderTarget);
19. SAFE_RELEASE(pD2DFactory);
20. } 第四步：绘图函数
1. pRenderTarget->DrawBitmap( 2. map[current_map].map, 3. window_size,// D2D1_SIZE_ F格式窗口大小 4. 1.0f, 5. D2D1_BITMAP_INTERPOLATION_MODE_LINEAR, 6. map_size // D2D1_SIZE_ F格式要显示的位图区域 7. );
将绘图函数放到begindraw与enddraw之间，几个函数放置在WndProc函数W的IN_PAIN中。
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本文标签： D2D RPG游戏开发日记（一）
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