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/*
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/*
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5/2016 changed  to 'setAttribute()' because of trouble on Chromium/Safari/IE
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5/2016 changed  to 'setAttribute()' because of trouble on Chromium/Safari/IE
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10/2016 corrected contex-reset-flaw when using "userdraw text,color" and added inputs to the things we can remove
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10/2016 corrected contex-reset-flaw when using "userdraw text,color" and added inputs to the things we can remove
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7/2017 added 'userdraw clickfill,color' to removable things...one user_filling per click
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7/2017 added 'userdraw clickfill,color' to removable things...one user_filling per click
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- 
 
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7/2022: preserve all div's with html ('<' && '/>') eg mathml,katex,html and all external objects placed with function 'place_image_on_canvas(id)'
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7/2022: preserve div's with math (katex | wims_mathml)...hope this does not interfere with other things
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...hope this does not interfere with other things
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https://wimsedu.info/?topic=geometrie-interactive-avec-canvasdraw
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https://wimsedu.info/?topic=geometrie-interactive-avec-canvasdraw
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*/
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*/
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fprintf(js_include_file,"\n/* add clear button */\
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fprintf(js_include_file,"\n/* add clear button */\
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clear_draw_area%d = function(){\
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clear_draw_area%d = function(){\
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 if(typeof(fill_canvas_no) === 'number'){\
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 if(typeof(fill_canvas_no) === 'number'){\
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  };\
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  };\
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 };\
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 };\
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 if( typeof(context_userdraw) === 'object' ){\
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 if( typeof(context_userdraw) === 'object' ){\
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  if(document.getElementById(canvas_div.lastChild.id).tagName == 'DIV'){\
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  if(document.getElementById(canvas_div.lastChild.id).tagName == 'DIV'){\
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   var mathtxt = document.getElementById(canvas_div.lastChild.id).innerHTML;\
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   var mathtxt = document.getElementById(canvas_div.lastChild.id).innerHTML;\
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   if(mathtxt.indexOf('katex') == -1 && mathtxt.indexOf('wims_mathml') == -1 || canvas_div.lastChild.id.indexOf('placed') != -1){\
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   if(mathtxt.indexOf('<') == -1 && mathtxt.indexOf('/>') == -1 || canvas_div.lastChild.id.indexOf('placed') != -1){\
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    document.getElementById(canvas_div.lastChild.id).innerHTML = null;\
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    document.getElementById(canvas_div.lastChild.id).innerHTML = null;\
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    canvas_div.removeChild(document.getElementById(canvas_div.lastChild.id));\
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    canvas_div.removeChild(document.getElementById(canvas_div.lastChild.id));\
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   };\
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   };\
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  };\
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  };\
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  context_userdraw.clearRect(0,0,xsize,ysize);\
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  context_userdraw.clearRect(0,0,xsize,ysize);\