Talk:Canvas snippets: Difference between revisions

Talk:Canvas snippets (view source)

2 bytes added , 11 April 2015

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20,741

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@@ Line 88: / Line 88: @@
 shuttle_symbol.setScale(0.20); # 20%
-# position the image (this could be done dynamically using a maketimer() callback)
+var update_shuttle = func() {
-# you'd want to use the current lat/lon here and recompute the x/y position using the Mercator projection
+var lat = getprop('/position/latitude-deg');
+var lon = getprop('/position/longitude-deg');
+var (x,y) = position2Pixels(lat:lat,lon:lon);
+shuttle_symbol.setTranslation(x,y,);
+}
+# can use maketimer() to call this regularly
+update_shuttle();
-shuttle_symbol.setTranslation(image_width/2+x_offset, image_height/2+y_offset);
 </syntaxhighlight>