Linux Certif

Toute la documentation sur la certification Linux LPI

glRotate.3gl

NAME

glRotated, glRotatef - multiply the current matrix by a rotation matrix

C SPECIFICATION

void glRotated( GLdouble angle,

 
                   GLdouble x,
                   GLdouble y,
                   GLdouble z )
 

void glRotatef( GLfloat angle,

 
                   GLfloat x,
                   GLfloat y,
                   GLfloat z )
 

delim $$

PARAMETERS

angle

Specifies the angle of rotation, in degrees.

x, y, z

Specify the x, y, and z coordinates of a vector, respectively.

DESCRIPTION

glRotate produces a rotation of angle degrees around the vector $("x", "y", "z")$. The current matrix (see glMatrixMode) is multiplied by a rotation matrix with the product replacing the current matrix, as if glMultMatrix were called with the following matrix as its argument:
left ( ~ down 20 matrix {
 ccol { 
   "x" sup 2 (1 ^-^ c)~+~ c above
   "y" "x" (1 ^-^ c)~+~ "z" s above
   "x" "z" (1 ^-^ c)~-~"y" s above
   ~0 
 } 
 ccol {
   ~~ "x" "y" (1 ^-^ c)~-~"z" s above
   ~~ "y" sup 2 (1 ^-^ c)~+~ c above
   ~~ "y" "z" (1 ^-^ c)~+~ "x" s above
   ~~ ~0
 } 
 ccol {
   ~~ "x" "z" (1 ^-^ c)~+~ "y" s above
   ~~ "y" "z" (1 ^-^ c)~-~ "x" s above
   ~~ "z" sup 2 (1 ^-^ c) ~+~  c above
   ~~ ~0
 } 
 ccol { ~0 above ~0 above ~0 above ~1} } ~~ right )

Where $c ~=~ cos ("angle")$, $s ~=~ sin ("angle")$, and $||(~"x", "y", "z"~)|| ~=~ 1$ (if not, the GL will normalize this vector).

If the matrix mode is either GL_MODELVIEW or GL_PROJECTION, all objects drawn after glRotate is called are rotated. Use glPushMatrix and glPopMatrix to save and restore the unrotated coordinate system.

NOTES

This rotation follows the right-hand rule, so if the vector $("x", "y", "z")$ points toward the user, the rotation will be counterclockwise.

ERRORS

GL_INVALID_OPERATION is generated if glRotate is executed between the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS

glGet with argument GL_MATRIX_MODE
glGet with argument GL_COLOR_MATRIX
glGet with argument GL_MODELVIEW_MATRIX
glGet with argument GL_PROJECTION_MATRIX
glGet with argument GL_TEXTURE_MATRIX

SEE ALSO

glMatrixMode(3G), glMultMatrix(3G), glPushMatrix(3G), glScale(3G), glTranslate(3G)