CHAPTER 4 HP-GL/2 - 16
With type 1 scaling you can specify the percentage of unused space that is to lie below, or to the left of,
the isotropic area.
left specifies the percentage of unused space you want to lie to the left of the isotropic area and can be from 0
to 100. If you do not specify the value for left, it is automatically set to the default value = 50%.
bottom specifies the percentage of unused space you want to lie below the isotropic area and can be from 0 to
100. If you do not specify the value for bottom, it is automatically set to the default value = 50%.
P1(0,0)
(10,10)
P2
P2
P2
P2
P1
P1
P1
(0,10)
(10,10)
(10,0)
(10,10)
(0,0)
(20,10)
SC 0,10,0,10,1,0,0
SC0,20,0,10,1,100,100
SC 0,10,0,10,1,100,100
SC 0,20,0,10,1,0,0
Extra space
Extra space
Extra space
Extra space
You must either specify both left and bottom, or specify neither. However, the printer can only use one of
these two parameters at a time, depending where the extra space is on a page. ¥
If you do not specify a percentage for unused space to the left or at the bottom, the isotropic area is centred
in the rectangle defined by P1 and P2.
Type 2 scaling (point factor scaling) specifies the ratio of graphics units to user units and sets user units
coordinates for P1.
X
factor
specifies the number of graphics units that comprise a single user x-axis unit.
Y
factor
specifies the number of graphics units that comprise a single user y-axis unit.
Valid values for X
factor
and Y
factor
are real numbers.
An SC command remains in effect until another SC command is issued, until default settings are restored
with the DF command or until the printer is initialized with an IN command.
10 '-Scale-'
20 WIDTH "LPT1:", 255
30 LPRINT CHR$(27); "E";
40 LPRINT CHR$(27); "%0B";
50 LPRINT "IN;SP1;"
60 '-- Anisotropic scaling --
70 LPRINT "PA1500,6000;EA3500,8000;"
80 LPRINT "IP1500,6000,3500,8000;SC0,200,0,100,0;PA50,50;CI50;"
90 LPRINT "IN;PA1500,3000;EA3500,5000;"
100 LPRINT "IP1500,3000, 3500,5000;SC0,100,0,200,0;PA50,50;CI50;"
110 LPRINT"IN;PA1300,8200;DT#;LBAnisotropic scaling#";
120 '--Isotropic scaling--
130 'Left,Bottom= 0,0
140 LPRINT "PA4500,6000;EA6500,8000;"
150 LPRINT"IP4500,6000,6500,8000;SC0,200,0,100,1,0,0;PA50,50;CI50;"
160 'Left, Bottom = 100,100
170 LPRINT "IN;PA4500,3000;EA6500,5000;"
180 LPRINT"IP4500,3000,6500,5000;SC0,100,0,200,1,100,100;PA50,50;CI50;"
190 LPRINT "IN;PA4000,82;DT#;LBIsotrop00ic scaling#";
200 LPRINT CHR$(27);"%0A";
210LPRINT CHR$(27);"E";
220 END
<Sample 21>
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