Glpixelzoom - HP b2600 Reference Manual

glPixelZoom

glPixelZoom: specify the pixel zoom factors.
C Specification
void glPixelZoom(
Parameters
xfactor, yfactor
Description
glPixelZoom specifies values for the x and y zoom factors. During the execution of
glDrawPixels or glCopyPixels, if (x
element is in the mth row and nth column of the pixel rectangle, then pixels whose
centers are in the rectangle with corners at
(x
(x
are candidates for replacement. Any pixel whose center lies on the bottom or left edge of
this rectangular region is also modified.
Pixel zoom factors are not limited to positive values. Negative zoom factors reflect the
resulting image about the current raster position.
Errors
•
Associated Gets
glGet with argument GL_ZOOM_X
glGet with argument GL_ZOOM_Y
See Also
glCopyPixels,
glDrawPixels
Chapter 14
GLfloat xfactor,
GLfloat yfactor)
Specify the x and y zoom factors for pixel write operations.
+ n ·xfactor, y + m ·yfactor)
r r
+ (n+1) ·xfactor, y + (m+1) ·yfactor)
r r
GL_INVALID_OPERATION is generated if glPixelZoom is executed between the
execution of glBegin and the corresponding execution of glEnd.
, y ) is the current raster position, and a given
r r
P
glPixelZoom
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