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                ## 2.3顏色 FLTK用一個32位的無符號整形存儲顏色。它可能是256種顏色一個索引,也可能是一個24位的RGB顏色。調色板不是X或WIN32的colormap,它是有對應固定內容的調色板 以下是一些常用的顏色的符號定義: + FL_BLACK + FL_RED + FL_GREEN + FL_YELLOW + FL_BLUE + FL_MAGENTA + FL_CYAN + FL_WHITE 這些符號是FLTK控件默認的顏色,詳細情況請參考Enumerations + FL_FOREGROUND_COLOR + FL_BACKGROUND_COLOR + FL_INACTIVE_COLOR + FL_SELECTION_COLOR RGB顏色可以用fl_rgb_color()函數設置。 ``` Fl_Color c = fl_rgb_color(80,170,255); ``` 控件的顏色用color()函數設置 ``` button->color(FL_RED); ``` 類似的,標簽的顏色用labelcolor()函數設置 ``` button->labelcolor(FL_WHITE); ```
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