Creating a graphics output is particularly simple with RBASIC. Opening and closing graph windows and plotting spectrum graphs can be accomplished with very little programming effort.

OPENGRAPH

Opens a graphics window with X,Y dimensions and names it.

Example:

OPENGRAPH("mygraph1",200,100)

CLOSEGRAPH

Closes a graphic window.

Example: CLOSEGRAPH("mygraph1")

CLEAR

Clears the graphic window.

Example:

CLEAR("mygraph1")

CLEARV

Clears only one vertical line in a graph.

Example:

CLEARV("mygraph1",x_coordinate)

This is useful for real-time plotting of spectra (clears the old spectrum).

CLEARH

Clears only one horizontal line in a graph.

Example:

CLEARH("mygraph1",y_coordinate)

SETCOLOR

Sets the current color (red, green, blue; with values ranging from 0 to 255) in the graph. This affects all drawing commands.

Example:

SETCOLOR("mygraph1",red,green,blue)

SETPOINT

Sets graph pixel [X,Y] to the current color. A synonym for SETPOINT is SETP.

Example:

SETPOINT("mygraph1",x,y)

or

SETP("mygraph1",x,y)

PLOT

Draws a line from last position to the new one.

Example:

PLOT("mygraph1",new_x,new_y)

LINE

Draws a line defined by the start and end co-ordinates.

Example:

LINE("mygraph1",x1,y1,x2,y2)

In addition to the above graphics commands, there is a single graphic function POINT, which returns the color of a point if it is set, and zero if it is reset. The color value is calculated as RED+256*GREEN+65536*BLUE (corresponding to hexadecimal representation BBGGRR).

Example:

color=POINT("mygraph1",x,y)