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Computing with ioLProgrammer's GuideLanguage Reference

abs tag   add tag   align field   and tag   array tag   audio tag   backgroundColor field   bold field   border field   borderBottom field   borderColor field   borderLeft field   borderRight field   borderStyle field   borderTop field   bottom field   box tag   button tag   carat field   checkBox tag   choiceBox tag   class tag   clear tag   clientFrame tag   color field   console tag   dialog tag   div tag   do field   ellipse tag   else field   eq tag   false tag   focus field   focusOrder field   font field   for tag   ge tag   gt tag   height field   hotKey field   if tag   img tag   inf tag   inline field   input tag   invalid tag   int tag   italic field   join tag   layer field   le tag   left field   limit field   line tag   lt tag   margin field   marginBottom field   marginLeft field   marginRight field   marginTop field   mod tag   mul tag   ne tag   neg tag   not tag   null tag   num tag   onClear field   onClick field   onCommit field   onContextClick field   onExit field   onFocus field   onGet field   onKeyDown field   onKeyPress field   onKeyUp field   onMouseDown field   onMouseIn field   onMouseMove field   onMouseOut field   onMouseUp field   onPull field   onPush field   onResize field   onTimer field   openLink tag   or tag   pivot field   playing field   put tag   putError tag   putLn tag   requestTransfer tag   right field   rotate field   scalar tag   scroll field   scrollPos field   selectable field   spacing field   spacingBottom field   spacingLeft field   spacingRight field   spacingTop field   span tag   split tag   sub tag   table tag   tabRow tag   then field   timer tag   top field   transfer tag   transferAbility tag   transition field   true tag   underline field   vector tag   video tag   visible field   void tag   width field   with field   xor tag


height, width fields

Category: vector fields

The height and width fields get or set the rendered on-screen dimensions of a presentation tag.

Applies to...

Sample usage

<box height=3,{em}>

Behaviour

Specifying a distance value for this field

This field takes a distance value specified with either one or two value elements.

If the units are not specified, the distance is interpreted in pixels {px} by default.
Unit specifierDescriptionExampleInterpretation
None Pixels (default units)55 pixels
{px} Pixels (explicitly stated)5,{px} 5 pixels
{%} Percentage units20,{%} 5%
{pt} Typesetting point units12,{pt} 12pt text size
{em} Multiple of current font size1.2,{em} 1.2 × current font size
Some programming languages use % symbols as placeholders when printing output to the console. In such cases, you might need to ouput the % character in a different way. For example, in C's printf function, you would need to specify 50,{%} as 50,{%%}.

Getting a value from this field

When getting a value for this field, a single numerical value in pixels is produced.

For the height and width fields, getting the current value of the field enables you to check the actual rendered dimensions of the tag in pixels.

Note: when applied to the console tag instance, you can get the values from the height and width fields in order to check the current size of the console in pixels, but you cannot change these values.

Programs cannot resize their own parent consoles.