[每日一码] 如何查询raster image的像素值

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1. void AsdkGetPixelValue()
2. {
3. ads采用name name;
4. ads采用point pt;
5. Acad::ErrorStatus es;
7. if (acedEntSel(L"\nSelect a Raster Image : ", name, pt) != RTNORM)
8. {
9.   return;
10. }
12. AcDbObjectId objId;
13. acdbGetObjectId(objId, name);
16. AcDbEntity * pEnt;
17. es = acdbOpenObject(pEnt, objId, AcDb::kForRead);
18. AcDbRasterImage *pRaster = AcDbRasterImage::cast(pEnt);
19. if (pRaster == NULL)
20. {
21. pEnt->close();
22.   return;
23. }
26. // Get pixel value
27. AcGeVector2d imgSize = pRaster->imageSize();
28. AcGeMatrix3d mat;
29. es = pRaster->getPixelToModelTransform(mat);
30. AcGePoint3d modpt;
32. if (acedGetPoint(NULL, L"\nSelect point in image : ", asDblArray(modpt)) != RTNORM)
33. {
34.   return;
35. }
38. AcGePoint3d pixpt(0,0,0);
39. pixpt = mat.inverse() * modpt;
42. int x = (int)pixpt[0];
43. int y = (int)pixpt[1];
46. if ((x > imgSize.x) || (x < 0) || (y > imgSize.y) || (y < 0))
47. {
48. acutPrintf(L"\n*** This point is not within the image ***\n");
49. pRaster->close();
50.   return;
51. }
52. else
53. {
54. acutPrintf(L"\nPixel Selected: (%d, %d)", x, y);
55. }
58. // Get a copy of the image from the rastier image def
59. AcDbRasterImageDef * pDef;
61. es = acdbOpenObject(pDef, pRaster->imageDefId(), AcDb::kForWrite);
62. Atil::Image* pImg = pDef->imageCopy();
65. pRaster->close();
66. pDef->close();
70. // Find out bits per pixel of image
71. Atil::ImageContext* imgContext = pImg->createContext(Atil::ImageContext::kRead, pImg->size(), Atil::Offset(0,0));
73. Atil::DataModelAttributes::BitsPerPixel bpp = pImg->dataModel().bitsPerPixel();
75. // Show pixel value
76. switch (bpp)
77. {
78. case Atil::DataModelAttributes::BitsPerPixel::k1:
79. acutPrintf(L"\nPixel value = %u\n", imgContext->get1(x,y));
80.   break;
81. case Atil::DataModelAttributes::BitsPerPixel::k8:
82. acutPrintf(L"\nPixel value = %u\n", imgContext->get8(x,y));
83.   break;
84. case Atil::DataModelAttributes::BitsPerPixel::k16:
85. acutPrintf(L"\nPixel value = %u\n", imgContext->get16(x,y));
86.   break;
87. case Atil::DataModelAttributes::BitsPerPixel::k32:
88. acutPrintf(L"\nPixel value = %u\n", imgContext->get32(x,y));
89.   break;
90. case Atil::DataModelAttributes::BitsPerPixel::k64:
91. acutPrintf(L"\nPixel value = %u\n", imgContext->get64(x,y));
92.   break;
93. default:
94. acutPrintf(L"\n*** This color scale is not supported. ***\n");
95. }
98. //Clean up
99. delete imgContext;
100. delete pImg;
102. return;
103. }

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