Difference between revisions of "gc:drawString"

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(top default in recent apilevels)
 
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This function is used to display text, numbers etc. on the screen at specified coordinates.
 
This function is used to display text, numbers etc. on the screen at specified coordinates.
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Returns an integer corresponding to the width of the displayed string.
 
Returns an integer corresponding to the width of the displayed string.
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| <u><center>y</center></u> || number || the ''y'' coordinate of the beginning of the string. Relative to ''position''.
 
| <u><center>y</center></u> || number || the ''y'' coordinate of the beginning of the string. Relative to ''position''.
 
|-
 
|-
| <u><center>position</center></u> || string || the string’s anchor point. It can either be "baseline", “bottom”, “middle”, or “top”.
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| <u><center>position</center></u> || string || the string’s anchor point (vertical alignment). It can either be "baseline", “bottom”, “middle”, or “top”. See screenshot below.
 
|}
 
|}
== Example ==
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<syntaxhighlight>gc:drawString("Hello World", 0, 0, "top")</syntaxhighlight>
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The ''position'' argument is optional, and defaults to "bottom" when not specified in apilevels < 2.3. For apilevels >= 2.3, the default is "top".
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 +
== Example ==
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<syntaxhighlight>function on.paint(gc)
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    gc:drawString("Hello World", 0, 0, "top")
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end</syntaxhighlight>
 
will display&nbsp;&nbsp;&nbsp; Hello World &nbsp;&nbsp;&nbsp; at the top-left part of the screen.
 
will display&nbsp;&nbsp;&nbsp; Hello World &nbsp;&nbsp;&nbsp; at the top-left part of the screen.
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 +
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== Good to know ==
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In order to clear up what 'position' does, here's an animated image with the 4 possibilities, showing a text that is drawn at the same 60;60 coordinates, but with different "position" attributes.<br />
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[[File:drawString_text_position.gif]]
  
 
<br /><br />
 
<br /><br />
 
[[Category:gc]]
 
[[Category:gc]]

Latest revision as of 07:00, 8 April 2015

drawString is a function that is part of gc (Graphics Context).

This function is used to display text, numbers etc. on the screen at specified coordinates.


Returns an integer corresponding to the width of the displayed string.


This has been introduced in TI-Nspire OS 3.0 (Changes).


Syntax

gc:drawString(string, x, y [,position])

Parameter Type Description
string
string The text to display
x
number the x coordinate of the beginning of the string. Relative to position.
y
number the y coordinate of the beginning of the string. Relative to position.
position
string the string’s anchor point (vertical alignment). It can either be "baseline", “bottom”, “middle”, or “top”. See screenshot below.

The position argument is optional, and defaults to "bottom" when not specified in apilevels < 2.3. For apilevels >= 2.3, the default is "top".

Example

function on.paint(gc)
     gc:drawString("Hello World", 0, 0, "top")
end

will display    Hello World     at the top-left part of the screen.


Good to know

In order to clear up what 'position' does, here's an animated image with the 4 possibilities, showing a text that is drawn at the same 60;60 coordinates, but with different "position" attributes.
drawString text position.gif