HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 88
Anisotropic scaling., SC0
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Note z XMIN, XMAX, YMIN, YMAX - These parameters represent the user-unit X- and Y-axis ranges, respectively. For example, SC0,15,0,10 indicates 15 user-units along the X-axis and 10 user-units along the Y-axis. As a result, the first and third parameters (XMIN and YMIN) are the coordinate pair that is mapped onto P1; the second and fourth parameters (XMAX and YMAX) are the coordinate pair mapped onto P2. Using the same example, the coordinate location of P1 is (0,0) and P2 is (15,10). This is different from the IP command, where the parameters are expressed as X,Y coordinate pairs rather than as ranges. XMIN cannot be set equal to XMAX, and YMIN cannot be set equal to YMAX. As their names suggest, you will normally want to specify XMIN smaller than XMAX, and YMIN smaller than YMAX. If you specify XMIN larger than XMAX and YMIN larger than YMAX, your illustration is drawn as a mirror-image, reversed and/or upside down, depending on the relative positions of P1 and P2. The parameters of the SC command are always mapped onto the current P1 and P2 locations. P1 and P2 retain these new values until scaling is turned off or another SC command redefines the user-unit values. Thus, the size of a user unit could change if any change is made in the relative position and distance between P1 and P2 after an SC command is executed. z Type - Specifies anisotropic or isotropic scaling. Table 19-20 0 Anisotropic scaling. Allows a user-unit along the X-axis to be a different size than user-units along the Y-axis. Printed shapes are distorted when you use anisotropic scaling. For example, a circle might be drawn as an ellipse-oval-shaped instead of round. (Left and bottom parameters are ignored for anisotropic scaling. 1 Isotropic scaling. Produces user-units that are the same size on both the X- and Y-axes. The following illustrations show how the printer adjusts the location of (XMIN,YMIN) and (XMAX,YMAX) to create the largest possible isotropic area within the P1/P2 limits. (Remember, the user-units are always square regardless of the shape of the isotropic area.) 19-42 The Configuration and Status Group EN