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7.5.16 open_canvas, clear_canvas, draw_obj, draw_string

open_canvas(id[,geometry])
:: Opens a canvas, which is a window for drawing objects.
clear_canvas(id,index)
:: Clears a canvas.
draw_obj(id,index,pointorsegment [,color])
:: Draws a point or a line segment on a canvas.
draw_string(id,index,[x,y],string [,color])
:: Draws a character string on a canvas.

return
0
id index color x y
integer
pointorsegment
list
string
character string

 
[182] Id=ox_launch_nox(0,"ox_plot");
0
[183] open_canvas(Id);
0
[184] Ind=ox_pop_cmo(Id);
0
[185] draw_obj(Id,Ind,[100,100]);
0
[186] draw_obj(Id,Ind,[200,200],0xffff);
0
[187] draw_obj(Id,Ind,[10,10,50,50],0xff00ff);
0
[187] draw_string(Id,Ind,[100,50],"hello",0xffff00);
0
[189] clear_canvas(Id,Ind);
0

References
7.5.1 ox_launch, ox_launch_nox, ox_shutdown, 7.5.6 ox_reset,ox_intr,register_handler, 7.5.8 ox_pop_cmo, ox_pop_local.

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