Here is a little more information. If, instead of the drawPrimitive(gl.LINES,[0,0,0,1],[0,0,0,0,0.04,0]); line I showed before, I enter the following line which includes the values of color and move, I do not get any error. Whether I include the `var` prefix to color and move does not seem to matter, either.
Any ideas? On the other hand I do not get a line drawn either, so even if the original problem is fixed, I have work to do connecting the drawPrimitive() with the canvas or the draw() function. Or maybe the location of this code is part of the non-drawing problem. Normally drawPrimitive() is executed within draw(), not outside of draw() as it is now. But the big issue is the error message I first mentioned: `ev_command_enter_ajax(d) failed` Raul, I assume your reply was about my question about a typo, that really has no effect on the processing, so I guess you are correct that the semi colon is unnecessary. drawPrimitive(gl.LINES,[0,0,0,1],[0,0,0,0,0.04,0]); On Wed, Mar 5, 2014 at 6:14 PM, Brian Schott <[email protected]> wrote: > In my turtle graphics app based on Eric's jdemogl1.ijs I want to use the > drawPrimitive() function to draw a line. For now I am experimenting with > drawing directly from ev_command_enter_ajax(ts). > > My version of ev_command_enter_ajax() is below, and when I leave all 3 > lines of code in, I get the error alert `ev_command_enter_ajax(d) failed` > [Btw, notice the 'd' in the parens]. I believe the values of color (ts[0]) > and move (ts[1]) are correct strings created by the J code, because > alert(color); and alert(move); produced the expected result. > > Any ideas about how to get the drawPrimitive() to work? > > function ev_command_enter_ajax(ts) > { > var color=ts[0]; > var move=ts[1]; > drawPrimitive(gl.LINES,color,move); > } > > Btw, the next 3 lines are copied from Eric's jdemogl1.ijs. Does the last > one contain a typo regarding the final semicolon in the last one? (If so, > should it be before the right curly bracket?) > > function ev_body_load(){init();} // must use JHS framework load handler > function ev_bgcolor_click(){jdoajax([],"");} > function ev_bgcolor_click_ajax(ts){bgcolor=eval(ts[0]);draw()}; > > Thank you, > > -- > (B=) > -- (B=) <-----my sig Brian Schott ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
