‎使用 ObjectARX 设置并获取实体颜色的 RGB 值？‎

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Setting and getting the RGB values of an entity’s color using ObjectARX?‎使用 ObjectARX 设置并获取实体颜色的 RGB 值？‎

[code]void asdkGetColor()

{

Adesk::UInt8 blue, green, red;



AcCmColor colors;

// set the color method

Acad::ErrorStatus es =

  colors.setColorMethod(AcCmEntityColor::kByColor);

// ok, lets try and set the color using setRGB and setColor

es = colors.setRGB(3, 2, 1); // nValue is an RGB value



// get the RGB value as an Adesk::Int32

Adesk::Int32 nValue = colors.color();



// now convert back to the original values, first 8 bits blue

blue = nValue;

// now move nValue right 8 bits, green

nValue = nValue>>8;

// now get the green

green = nValue;

// move right to the next 8 bits red

nValue = nValue>>8;

red = nValue;



// should be red = 3, green = 2, blue = 1 :-)



{

  // lets try the other way

  AcCmColor colors;

  Acad::ErrorStatus es =

   colors.setColorMethod(AcCmEntityColor::kByColor);

  // simply get the value with no colours

  // set, only the color method bits

  Adesk::Int32 nValue = colors.color();



  // now set up the colours from our previous values

  Adesk::Int8 *ptr =

   reinterpret_cast<Adesk::Int8 *> (&nValue);

  // now reconstruct

  *(ptr)   = blue;

  *(ptr+1) = green;

  *(ptr+2) = red;



  // now we can try setColor

  es = colors.setColor(nValue);

}

// all works

}[/code]