Commodore 128D - Page 112

the boundary line df a pixel that is colored from the same
source. The source numbers of the screen coordinate and the
coordinate specified in the PAINT command must be different.
Displaying Characters on a Bit Mapped Screen—The CHAR
Command
So far, the example program has operated in standard bit map mode.
Bit map mode uses a completely different area of memory to store
the screen data than text mode (the mode in which you enter pro
grams and text). If you enter bit map mode, and try to type charac
ters onto the screen, nothing happens. This is because the charac
ters you are typing are being displayed on the text screen and you
are looking at the bit map screen. Sometimes it is necessary to dis
play characters on the bit map screen, when you are creating and
plotting charts and graphs. The CHAR command is designed espe
cially for this purpose. To display standard characters on a bit map
screen, use the CHAR statement as follows:
220 CHAR 1,11,24,"GRAPHICS EXAMPLE"
This displays the text "GRAPHICS EXAMPLE" starting at line 25,
column 12. The CHAR command can also be used in text mode,
however, it is primarily designed for the bit map screen.
Changing the Size of Graphic Images—
The SCALE Command
The Commodore 128 has another graphics statement which offers
additional power to your graphics system. The SCALE statement
offers the ability to scale up (enlarge) or scale down (reduce) the size
of graphic images on your screen. The SCALE statement also
accomplishes another task, which can be explained as follows.
In standard bit-map mode, the 40-column screen has 320 horizontal
coordinates and 200 vertical coordinates. In multicolor bit map
104 USING C128 MODE—Color, Animation and Sprite Graphics Statements