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2001/10/02
CHAPTER 4 HP-GL/2 - 36
• With screen type 21 option 1 specifies one of six predefined PCL cross-hatch patterns (patterns 1 - 6).
option 2 is ignored.
• With screen type 22, option 1 specifies the ID number of PCL user-defined pattern which is defined by the
ESC*c#W command. option 2 is ignored.
• With fill screen type 130 option 1 specifies the percentage of shading ( 0 - 100 ): option 2 is ignored.
• If option 1 and option 2 are omitted, the most recently specified values for these parameters, for the
specified screen type, are used.
• All screening patterns use the current anchor corner.
• Invoking the command with no parameter turns screening off. This is equivalent to SV0;
10 '-Screened Vectors-
20 WIDTH "LPT1:", 255
30 LPRINT CHR$(27); "E";
40 LPRINT CHR$(27); "%0B";
50 LPRINT "IN;SP1;";
60 LPRINT "SV1,15;PA4000,5000;CI500;"
70 LPRINT "SV1,50;PA5000,4000;CI400;"
80 LPRINT "SV1,100;PA6000,6000;CI300;"
90 LPRINT "PW10;SV21,5;PA2000,1000;PD;AA0,0,90;PC;"
100 LPRINT "PW5;SV21,3;PA6000,6000;CI500;"
110 LPRINT "PW7;SV21,6;PA2000,8000;PDPA5000,8000;PU;"
120 LPRINT "PW7;SV21,6;PA2000,8000;PDPA5000,8000;PU;"
130 LPRINT "1,1,0,0,0,0,0,0,1,1,";
140 LPRINT "0,0,1,1,0,0,1,1,0,0,";
150 LPRINT "0,0,0,0,1,1,0,0,0,0,";
160 LPRINT "0,0,1,1,0,0,1,1,0,0,";
170 LPRINT "1,1,0,0,0,0,0,0,1,1;";
180 LPRINT
"PW15;SV2,3;PA4000,2000;PM0;PD6000,2000,6000,4000,4000,4000;PM1;PM2;EP;
"
190 LPRINT CHR$(27); "%0A";
200 LPRINT CHR$(27); "E";
210 END
<Sample 44>
TR - Transparency mode
TR [ n ] [;]
n ; transparency type
• This command turns transparency mode on and off. Transparency mode defines how source and
destination graphics images interact.
• n is either 0 (off) or 1(on).
• When transparency mode is on, the white parts of a source image (the image that is being superimposed on
the destination image) do not affect the destination image - that is, part of the destination image will be
visible beneath the source image.
• When transparency mode is off the destination image is not visible beneath the source image.
• Invoking the command with no parameter turns transparency mode on. This is equivalent to TR1;
• An Esc E reset, a control panel reset, the IN command and the DF command all turn transparency mode
on.
10 'Transparency Mode-
20 WIDTH "LPT1:", 255
30 LPRINT CHR$(27); "E";
40 LPRINT CHR$(27); "%0b";
50 LPRINT "IN;SP1;";
60 'PART1 TR1
70 'Original Destination 1
80 LPRINT "TR1;PA1900,4900;PM0;PM3100;4900,2500,6100;PM1;"
90 LPRINT "PM2;FP;"
100 'Source 1
110 LPRINT "FT10,50;PA2000,5000;RR500,500;PA2500,5500;RR500,500;"
120 LPRINT "FT10,1;PA2500,5000;RR500,500;PA2000,5500;RR500,500;FT;"
130 'PART2 TR0
140 'Original Destination 2