List of Subroutines:

• graph_del wd sca

! Function returning the offset of the drawing area of a graph
! wd = width of the graph
! sca = hscale parameter of the graph


• graph_select wd hi hsc vsc xmn xmx ymn ymx

! Initialize graph variables and functions such as xg() and yg()
! wd = width of graph
! hi = height of graph
! hsc = hscale parameter of graph
! vsc = vscale parameter of graph
! xmn, xmx = minimum and maximum xaxis value
! ymn, ymx = minimum and maximum yaxis value


• graph_line x1 y1 x2 y2

! Function to draw a line on a graph
! x1, y2 = start point
! x2, y2 = end point


• graph_hgrid nb color$

! Function to draw an horizontal equidistant grid on a graph
! (use 'under graph_hgrid 5 "red"' in your graph block)
! nb = number of lines in grid
! color$ = color for grid lines


• graph_vgrid nb color$

! Function to draw a vertical equidistant grid on a graph
! (use 'under graph_vgrid 5 "red"' in your graph block)
! nb = number of lines in grid
! color$ = color for grid lines


• graph_grid nbh nbv color$

! Function to draw an equidistant grid on a graph
! (use 'under graph_grid 5 "red"' in your graph block)
! nb = number of lines in grid
! color$ = color for grid lines


• graph_origin

! Go to the origin of a graph selected with selectgraph


• graph_zeroaxis style color$



• graph_textbox xp yp dx dy str$



• graph_text xp yp dx dy str$



• invxg x



• invyg y



• graph_print_inv x y