Specifications

Revision C 16/01/96
Chapter 8 "HP-GL2" 42
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
150 LPRINT "TR0;PA3900,4900;PM0;PA5100,4900,4500,6100;PM1;"
160 LPRINT "PM2;FP;"
170 'Source 2
180 LPRINT "FT10,50;PA4000,5000;RR500,500;PA4500,5500;RR500,500;"
190 LPRINT "FT10,1;PA4500,5000;RR500,500;PA4000,5500;RR500,500;FT;"
200 '
210 '( POLYGON )
220 LPRINT "PA2000,1000;PM0;PDPA4000,1000,3000,3000;PM1;"
230 LPRINT "PA2500,1200,3500,1200,3000,2500;PM1;"
240 LPRINT "PA3000,800,3700,2500,2300,2500;PM1;"
250 LPRINT "PM2;FP;"
260 LPRINT CHR$(27); "%0A";
270 LPRINT CHR$(27); "E";
280 END
<Sample 45>