105 lines
3.9 KiB
HTML
105 lines
3.9 KiB
HTML
|
<HTML>
|
||
|
|
<HEAD><TITLE>QuickBASIC 3.0 - Long Entry</TITLE></HEAD>
|
||
|
|
<BODY>
|
||
|
|
|
||
|
|
<A HREF="nge1c2.html">[<<Previous Entry]</A>
|
||
|
|
<A HREF="ng320.html">[^^Up^^]</A>
|
||
|
|
<A HREF="ngf078.html">[Next Entry>>]</A>
|
||
|
|
<A HREF="menu.html" >[Menu]</A>
|
||
|
|
<A HREF="info.html">[About The Guide]</A>
|
||
|
|
<HR>
|
||
|
|
<PRE>
|
||
|
|
<B>DRAW Draw Object</B>
|
||
|
|
|
||
|
|
<B>DRAW</B> <U>string</U>
|
||
|
|
|
||
|
|
Draws an object according to instructions specified as a string
|
||
|
|
expression.
|
||
|
|
|
||
|
|
<U>string</U> A string expression containing commands in the BASIC
|
||
|
|
graphics definition language.
|
||
|
|
|
||
|
|
<B>Graphics Definition Language</B>
|
||
|
|
|
||
|
|
In the movement instructions below, <U>n</U> specifies a distance to move.
|
||
|
|
The number of pixels moved is equal to <U>n</U> multiplied by the current
|
||
|
|
scaling factor, which is set by the S command.
|
||
|
|
|
||
|
|
U<U>n</U> Move up.
|
||
|
|
|
||
|
|
D<U>n</U> Move down.
|
||
|
|
|
||
|
|
L<U>n</U> Move left.
|
||
|
|
|
||
|
|
R<U>n</U> Move right.
|
||
|
|
|
||
|
|
E<U>n</U> Move diagonally up and right.
|
||
|
|
|
||
|
|
F<U>n</U> Move diagonally down and right.
|
||
|
|
|
||
|
|
G<U>n</U> Move diagonally down and left.
|
||
|
|
|
||
|
|
H<U>n</U> Move diagonally up and left.
|
||
|
|
|
||
|
|
M<U>x</U>,<U>y</U> Move to coordinate <U>x</U>,<U>y</U>. If <U>x</U> is preceded by a + or -, the
|
||
|
|
movement is relative to the last point referenced (LPR).
|
||
|
|
|
||
|
|
B A prefix command. Next movement command moves but doesn't
|
||
|
|
plot.
|
||
|
|
|
||
|
|
N A prefix command. Next movement command moves, but returns
|
||
|
|
immediately to previous point.
|
||
|
|
|
||
|
|
A<U>n</U> Set angle. <U>n</U> may be 0, for 0 degrees; 1, for 90 degrees;
|
||
|
|
2, for 180 degrees; or 3, for 270 degrees. Rotated figures
|
||
|
|
are rescaled to adjust to the CGA's 4/3 aspect ratio.
|
||
|
|
|
||
|
|
TA<U>n</U> Turn angle. <U>n</U> may range from -360 degrees to +360 degrees.
|
||
|
|
Positive values cause counterclockwise rotation; negative
|
||
|
|
values cause clockwise rotation.
|
||
|
|
|
||
|
|
C<U>n</U> Set color to <U>n</U>. The default color for medium-resolution
|
||
|
|
is 3; high-resolution default color is 1. See PALETTE for
|
||
|
|
a list of legal colors.
|
||
|
|
|
||
|
|
S<U>n</U> Set scale factor. <U>n</U> may range from 1 to 255. The scaling
|
||
|
|
factor used is <U>n</U>/4. The default for <U>n</U> is 4.
|
||
|
|
|
||
|
|
P<U>paint</U>,<U>boundary</U> Fill figure color to <U>paint</U>, stopping at areas of color
|
||
|
|
<U>boundary</U>. See PALETTE for a list of legal colors.
|
||
|
|
|
||
|
|
"=" + VARPTR$(<U>var</U>)
|
||
|
|
Get argument from variable. May be used to supply
|
||
|
|
arguments to any of the foregoing commands.
|
||
|
|
|
||
|
|
"X" + VARPTR$(<U>stringvar</U>)
|
||
|
|
Execute command sequence stored in a string variable. This
|
||
|
|
command allows you to call graphics-language subroutines.
|
||
|
|
|
||
|
|
-------------------------------------------------------------------------
|
||
|
|
|
||
|
|
<B>Notes:</B> To get arguments or instructions from variables, you must
|
||
|
|
use VARPTR$(<U>var</U>) or VARPTR$(<U>stringvar</U>). QuickBASIC does
|
||
|
|
not support the =<U>variable</U>; and X<U>stringvar</U> formulations
|
||
|
|
available with the Interpreter.
|
||
|
|
|
||
|
|
Spaces between or within instructions are insignificant.
|
||
|
|
|
||
|
|
Semicolons may be used between commands to enhance
|
||
|
|
readability.
|
||
|
|
|
||
|
|
The drawing begins at the last point referenced (LPR) and
|
||
|
|
LPR is updated as the object is being drawn.
|
||
|
|
</PRE>
|
||
|
|
<HR>
|
||
|
|
<B>See Also:</B>
|
||
|
|
<A HREF="ng23171.html">PALETTE</A>
|
||
|
|
<A HREF="ng2c723.html">SCREEN (Statement)</A>
|
||
|
|
<A HREF="ng321ab.html">VARPTR$</A>
|
||
|
|
<HR>
|
||
|
|
This page created by ng2html v1.05, the Norton guide to HTML conversion utility.
|
||
|
|
Written by <A HREF="http://www.acemake.com/hagbard">Dave Pearson</A>
|
||
|
|
<HR>
|
||
|
|
</BODY>
|
||
|
|
</HTML>
|