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From: Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups: comp.lang.javascript
Subject: Re: Javascripts and highlevel computer language programming of graphics
Date: Mon, 24 Apr 2017 21:24:48 +0100
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jonas.thornvall@gmail.com writes:
<snip>
> I have tried your approach i get a type error
>
> TypeError: callfunctions[m] is not a function
>     at redraw (6PAINTCANVAS.4
>
> // Paint logic *here i call redraw
> function redraw() {
>      // Redraw graph every x-th millisec
>      for (var m=0;m<callfunctions.length;m++) {callfunctions[m]()} //TYPEERROR

This tries to call all the elements of the array...

> }
>
> //This is in init *global*
> callfunctions = new Array();
>
> //HERE I BUILD UP CANVAS *HARDCODED* probably should use push...
> function build_canvas(arr) {
>     callfunctions[0]=back_ground;
>
>     if (grid==true)  { callfunctions[1]=graphBackground; }

but if grid is false, callfunctions[1] will not be a function.

>     if (markarea == true) {
>         callfunctions[2]=markDraw;
>     } else if (moveit == true) {
>         callfunctions[2]=moveDraw;
>     } else if (reshape == true) {
>         callfunctions[2]=boundariesDraw;
>     } else if (doreshape == true) {
>         callfunctions[2]=reshapeDraw;
>     } else if (holdbezier1==true){
>       callfunctions[2]=moveBezierDraw1;
>     } else if (holdbezier2==true){
>       callfunctions[2]=moveBezierDraw2;
>     }

The same could also happen with callfunctions[2] depending on the
outcome of all these tests.

>     callfunctions[3]=graphDraw;
>
>     if (handles==true){
>       callfunctions[4]=nodeDraw;
>     }
>
>     callfunctions[4]=paint_message;

This is odd.  There's no point in setting callfunctions[4]=nodeDraw of
you are going to assign a different value immediately afterwards.

> }

<snip>
-- 
Ben.