glutGetColor3
Retrieves a red, green, or blue component for a given color index colormap entry for the layer in use's logical colormap for the current window.
Usage
GLfloat glutGetColor(int cell, int component);
Arguments
cell
|
Color cell index (starting at zero). |
|---|---|
component
|
One of GLUT_RED, GLUT_GREEN, or GLUT_BLUE. |
Overview
glutGetColor retrieves a red, green, or blue component for a given color index colormap entry for the current window's logical colormap. The current window should be a color index window. cell should be zero or greater and less than the total number of colormap entries for the window. For valid color indices, the value returned is a floating point value between 0.0 and 1.0 inclusive. glutGetColor will return -1.0 if the color index specified is an overlay's transparent index, less than zero, or greater or equal to the value returned by glutGet(GLUT_WINDOW_COLORMAP_SIZE), that is if the color index is transparent or outside the valid range of color indices.