yes, you can use the cross hair tool (shortcut C, A to get back to Arrow)
to read coordinates off a graph.
If you are writing JSL code to do something, you can add a graphic script:
Graph Builder(
Size( 522, 450 ),
Show Control Panel( 0 ),
Variables( X( :weight ), Y( :height ) ),
Elements( Points( X, Y, Legend( 6 ) ), Smoother( X, Y, Legend( 7 ) ) ),
SendToReport(
Dispatch(
{},
"Graph Builder",
FrameBox,
{Add Graphics Script(
2,
Description( "Script" ),
If( Is Empty( g_x1 ),
g_x1 = [139.41, 134.50, 92.26];
g_y1 = [68.63, 52.27, 63.04];
);
Drag Line( g_x1, g_y1 );
), Grid Line Order( 1 ), Reference Line Order( 3 )}
)
)
)
there are several script functions similar to drag_line that allow the graph to interact with the mouse. This example is built in to the graph's Customize->plus->samples. You can drag the endpoints.
Craige