XGraphicsglPointSize Method

Parameters

size

Type: SystemDouble
The diameter of rasterized points. The default is 1.0.

Return Value

Type: 
This function does not return a value.

The glPointSize function specifies the rasterized diameter of both aliased and anti-aliased points. Using a point size other than 1.0 has different effects, depending on whether point anti-aliasing is enabled. Point anti-aliasing is controlled by calling glEnable and glDisable with argument GL_POINT_SMOOTH. If point anti-aliasing is disabled, the actual size is determined by rounding the supplied size to the nearest integer. (If the rounding results in the value 0, it is as if the point size were 1.) If the rounded size is odd, then the center point (x,y) of the pixel fragment that represents the point is computed as (xw + .5, yw + .5) where w subscripts indicate window coordinates. All pixels that lie within the square grid of the rounded size centered at (x,y) make up the fragment. If the size is even, the center point is (xw + .5, yw + .5) and the rasterized fragment's centers are the half-integer window coordinates within the square of the rounded size centered at (x,y). All pixel fragments produced in rasterizing a nonantialiased point are assigned the same associated data; that of the vertex corresponding to the point. If anti-aliasing is enabled, then point rasterization produces a fragment for each pixel square that intersects the region lying within the circle having diameter equal to the current point size and centered at the points (xw ,yw ). The coverage value for each fragment is the window coordinate area of the intersection of the circular region with the corresponding pixel square. This value is saved and used in the final rasterization step. The data associated with each fragment is the data associated with the point being rasterized. Not all sizes are supported when point anti-aliasing is enabled. If an unsupported size is requested, the nearest supported size is used. Only size 1.0 is guaranteed to be supported; others depend on the implementation. The range of supported sizes and the size difference between supported sizes within the range can be queried by calling glGet with arguments GL_POINT_SIZE_RANGE and GL_POINT_SIZE_GRANULARITY. The point size specified by glPointSize is always returned when GL_POINT_SIZE is queried. Clamping and rounding for aliased and anti-aliased points have no effect on the specified value. Non-anti-aliased point size may be clamped to an implementation-dependent maximum. Although this maximum cannot be queried, it must be no less than the maximum value for anti-aliased points, rounded to the nearest integer value.