Example

TLINE 0;0;3;3:

Erases previously drawn 45 degree line from (0,0) to (3,3), or draws that line if it doesn’t already exist.

Graphic commands

The graphic commands use the graphics variables G0 through G9—or the Page variable from Sketch—as graphicname arguments. The position argument takes the form (x,y). Position coordinates depend on the current aplet’s scale, which is specified by Xmin, Xmax, Ymin, and Ymax. The upper left corner of the target graphic (graphic2) is at (Xmin,Ymax).

 

You can capture the current display and store it in G0 by

 

simultaneously pressing

+

.

DISPLAY→

Stores the current display in graphicname.

 

DISPLAY→ graphicname:

 

→DISPLAY

Displays graphic from graphicname in the display.

 

→DISPLAY graphicname:

 

→GROB

Creates a graphic from expression, using font_size, and

 

stores the resulting graphic in graphicname. Font sizes

 

are 1, 2, or 3. If the fontsize argument is 0, the HP 39gs

 

creates a graphic display like that created by the SHOW

 

operation.

 

 

 

→GROB graphicname;expression; fontsize:

GROBNOT

Replaces graphic in graphicname with bitwise-inverted

 

graphic.

 

 

 

GROBNOT graphicname:

 

GROBOR

Using the logical OR, superimposes graphicname2 onto

 

graphicname1. The upper left corner of graphicname2 is

 

placed at position.

 

 

GROBOR graphicname1;(position);graphicname2:

Example

GROBOR G0; (1,1); G1:

Programming

18-21