HP 39g+ Graphing Calculator User's Guide download pdf (Page 230)

16-20 Programming

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:

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HP 39g+ Graphing Calculator User's Guide Page 230