ERASE

Clears the display

 

ERASE:

FREEZE

Halts the program, freezing the current display.

 

Execution resumes when any key is pressed.

LINE

Draws a line from (x1, y1) to (x2, y2).

 

LINE x1;y1;x2;y2:

PIXOFF

Turns off the pixel at the specified coordinates (x,y).

 

PIXOFF x;y:

PIXON

Turns on the pixel at the specified coordinates (x,y).

 

PIXON x;y:

TLINE

Toggles the pixels along the line from (x1, y1) to (x2, y2)

 

on and off. Any pixel that was turned off, is turned on;

 

any pixel that was turned on, is turned off. TLINE can be

 

used to erase a line.

 

TLINE x1;y1;x2;y2:

 

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:

 

16-20

Programming