935
edits
Changes
Jump to navigation
Jump to search
Line 1:
Line 1: − + − + − + Line 20:
Line 20: +
no edit summary
Returns a dummy [[:Category:gc|graphics context]].<br />
Returns a dummy [[:Category:gc|graphics context]].<br />
As a consequence, you are able to use the functions made for the "normal" [[:Category:gc|gc]]
As a consequence, you are able to use the functions made for the "normal" [[:Category:gc|gc]].
It is typically used to measure pixel lengths and heights of strings when a normal graphics context is not available.<br />
It is typically used to measure pixel lengths and heights of strings when a normal graphics context is not available.<br />
This may be the case when creating new text elements when the script app is initialized.<br />
This may be the case when creating new text elements when the script app is initialized.<br />
A graphics context is available only during paint events, and that may be too late to create and size the containers for text fields.
A graphics context is available only during paint events, and that may be too late to create and size the containers for text fields.<br />
This graphics context cannot be used to draw graphics since it is not tied to a window. It can however do that if this gc is used in a function called within [[on.paint]].
This graphics context cannot be used to draw graphics since it is not tied to a window. It can however do that if this gc is used in a function called within [[on.paint]].
<br />
<br />
Here is an example of using the dummy graphics context to get the pixel length and height of a string.
Here is an example of using the dummy graphics context to get the pixel length and height of a string :
<syntaxhighlight>local gc = platform.gc() -- Get the dummy graphics context
<syntaxhighlight>local gc = platform.gc() -- Get the dummy graphics context
gc:begin() -- Makes it the current graphics context
gc:begin() -- Makes it the current graphics context
{{Since|3.0}}
{{Since|3.0}}
{{ObsoleteSince|3.2}}
[[Category:platform]]
[[Category:platform]]
