cpdf_setrgbcolor
Description
bool cpdf_setrgbcolor ( int pdf_document, float red_value, float green_value, float blue_value)The cpdf_setrgbcolor() function sets the current drawing and filling color to the given rgb color value. 如果成功则返回 TRUE，失败则返回 FALSE。
注: The values are expected to be floating point values between 0.0 and 1.0. (i.e black is (0.0, 0.0, 0.0) and white is (1.0, 1.0, 1.0)).
See also cpdf_setrgbcolor_stroke() and cpdf_setrgbcolor_fill().