Remote-processing RPC-2350 Bedienungsanleitung PDF herunterladen (Seite 65)

GRAPHIC DISPLAY PORT CHAPTER 15

15-4

largest font is 32 pixels wide by 48 tall.

Small characters are pr inted on its own plane. Thus,

small text can be turned off if desired. The larger sizes

are considered graphics and are printed on the graphics

plane.

Printing small characters is much like printing to a

terminal. U nless there is a semi-colon (;) at the end of a

PRIN T or D ISPLAY statement, the cursor advances to

the beginning of the next line simulating a

< CR> < LF> sequence.

Text is printed using a number of CAM BASIC

commands. Some of them are listed below.

PRIN T #10, ”T ext”

PRINT #10,USING “##.####”;A

DISPLAY “T ext”

DISPLAY (Row, Colum n); ” Text”

DISPLAY L (Row , C olumn); ”T ext”;

DISPLAY M (Row, Colum n);” Text” ;

DISPLAY M, R(Row, Column);"Text";

PRINT #10 can write formatted number s and text in the

same way as PRINT. PRINT uses small text. Larger

characters must use DISPLAY. PRINT USING is not

available for larger chara cters.

Medium and large char acters are form ed in CAM BASIC

and are treated as graphics . P rinting these characters is

much the same as sm all ones. The m ajor differ ence is

CAM BASIC does not re-position text on the next line if

you run out of room on the current line.

Positioning text

Small character text is positioned using the DISPLAY

command. Text begins in the upper left corner at (0,0).

The lower right corner is (29,39). Text is auto-

incremented to the next position. When small text is at

the end of the line, it is positioned at the next line. An

entire screen of small text will scroll up one line when

the bottom line is printed followed by a < LF>

character.

Medium sized characters are positioned based on

graphical X and Y pixel position. When printing a

string, characters automatically advance to the right by

10 pixels.

The X, Y coordinates in the DISPLA Y command for

medium characters specify the upper right corner of the

character block. Thus, a D ISPLAY M(2,3) command

starts printing the char acter on the 3rd pixe l to the right,

and 4th pixel down from the top (coordinates start at

0,0).

The largest character is positioned based on pixel and

small character resolution. T he X position starts on the

column based on the small character set. Its range is 0-

34. The Y position sets the top of the chara cter. Its

range is 0 to 192. Thus, you have 19 2 vertical p oints

and 35 horizontal points to position a large character.

Medium and large char acters are drawn as gr aphics.

This means they app ear on the graphics layer. The fonts

for these characters are stored in Flash EPROM , U3. If

this EPROM is missing or W11 is removed, the larger

characters will display garbage. Fonts can be modified

as desired. See "C hanging and loading fonts" later in this

chapter.

Printing normal and reverse characters

Medium and large characters may be printed in normal

(white on black backgr ound) and r everse (black on w hite

background). This is done by specifying the "R"

parameter in the DISPLAY com mand.

DISPLAY M,R(0,0)"REVERSE";

DISPLAY M(0,16)"NORMAL";

The semi-colon (;)

You may (or may not) notice a semi-colon (;) after

some, but not all DISPLAY and PRINT #10 statements.

A (;) suppresses a < CR> < LF> sequence to the

display (and serial ports). A comma (,) works in a

similar fashion except a number of spaces are printed

while it tabs to the next location..

The display driver was designed so when printing sm all

characters, the screen acted like a terminal display.

Thus, a < CR> < LF> sequence simply moved the

cursor down one line.

Medium and large char acters do not operate this way. A

< CR> or < LF> are simply tr eated as spaces. Unless

you include a ";" at the end of a DISPLAY M or

DISPLAY L type line, you will effectively print two

more blocks of character s. T his is especially notic eable

in the reverse display mode.

Scrolling

Small text automatically scrolls up 1 line when it reaches

the bottom of the screen. Thus, the display acts like a

terminal.

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 82 83

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