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Set center
From FenixWiki
| Revision as of 14:27, 22 May 2007 (edit) G105b (Talk | contribs) (→Definition) ← Previous diff |
Current revision (16:08, 25 February 2008) (edit) (undo) 85.144.194.29 (Talk) (Category changed to "controlpoints".) |
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| [[Category:functions]] | [[Category:functions]] | ||
| - | [[Category: | + | [[Category:controlpoints]] |
| ==Definition== | ==Definition== | ||
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| == Notes == | == Notes == | ||
| - | You set the position of [[control point]] 0 in the graphic. This | + | You set the position of [[control point]] 0 in the graphic. This control point gives acts as the graphic's [[coordinate]] on screen. For example, if a graphic's centre is set to 0,0 , then the upper left pixel of the graphic will be placed on screen at the graphic's coordinates. If no centre is set, by default control point 0 is set to the graphics true geometric centre. |
| Another key feature is that the graphic will rotate around its centre, as set by this function, and any horizontal or vertical mirrors (set with [[flags]]) will flip at this point. | Another key feature is that the graphic will rotate around its centre, as set by this function, and any horizontal or vertical mirrors (set with [[flags]]) will flip at this point. | ||
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| End | End | ||
| </pre> | </pre> | ||
| + | Used in example: [[load_png]](), [[write]]() | ||
| - | File(s) used in | + | File(s) used in example: [http://wwwhome.cs.utwente.nl/~bergfi/fenix/wiki/set_center.PNG set_center.png] |
| - | + | {{Funcbox | |
| + | | category = Controlpoints | ||
| + | }} | ||
Current revision
Contents |
[edit] Definition
INT set_center ( <INT FileID> , <INT GraphID> , <INT x> , <INT y>)
Allows you to change the centre pixel of a graph.
This function changes a graphic's centre pixel, which is the pixel that is located on screen at the graph's x and y coordinates.
[edit] Parameters
| INT FileID | - The FileID assigned to the archive. |
| INT GraphID | - The GraphID who's centre to change. |
| INT x | - The new horizontal centre coordinate of the graph. |
| INT y | - The new vertical centre coordinate of the graph. |
[edit] Returns
INT : Always returns 1 (?).
[edit] Notes
You set the position of control point 0 in the graphic. This control point gives acts as the graphic's coordinate on screen. For example, if a graphic's centre is set to 0,0 , then the upper left pixel of the graphic will be placed on screen at the graphic's coordinates. If no centre is set, by default control point 0 is set to the graphics true geometric centre.
Another key feature is that the graphic will rotate around its centre, as set by this function, and any horizontal or vertical mirrors (set with flags) will flip at this point.
When a graphic is used as a mouse pointer, its centre point is used for the mouse tip. Most mouse cursors in Operating Systems have a mouse with the tip in the upper left of the image. Therefore, for a standard mouse pointer in Fenix, you will have to set the centre at 0,0 to enable mouse acuracy.
[edit] Example
Program example;
Begin
graph=load_png("set_center.png"); //Loads a 128x128 image as the graphic
x=160;
y=100; //Places the graphic in the centre of the screen
write(0,0,0,0,"Press [1] to set centre to 0,0");
write(0,0,0,10,"Press [2] to set centre to 64,64");
Loop
if(key(_1))
set_center(0,graph,0,0);
end
if(key(_2))
set_center(0,graph,64,64);
end
angle+=100; //Rotates the graphic constantly
frame;
End
End
Used in example: load_png(), write()
File(s) used in example: set_center.png
| Controlpoints Functions | |
| • Get_point() • Set_center() • | |
