The function sets the current line stipple pattern. The second parameter is an unsigned short (i.e., a 16-bit number) and defines the stippling pattern while the first sets the stretch factor. The 0s and 1s in the binary representation of pattern determine how the pixels forming the line are displayed. Starting with the low-order bits and moving left in the number, a 1 means the pixel is on (gets the line color) and a 0 means the pixel is off (does not get the line color). The factor multiplies the number of 1s and 0s in the subparts of pattern and, in essence, stretches the pattern. The pattern (or stretched pattern) is repeated as many times as necessary to cover the line being rendered. If the geometry type is line strip or line loop, the pattern continues over the common vertices without restarting at each endpoint. Line stippling is a property that must be enabled in order for it to be applied. Enabling and disabling is accomplished with GLenum value  GL_LINE_STIPPLE defined in gl.h.

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