Incorrect width measurement of vector objects

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#1 
local joystick = display.newGroup()  
joystickOuter = display.newCircle( 60 , 60 , 59 )joystickOuter:setFillColor( 45 , 66 , 72 )  
joystickOuter.strokeWidth = 2  
joystickOuter:setStrokeColor( 183 , 237 , 254 )  
joystick:insert( joystickOuter )  
joystick.joystickOuter = joystickOuter  
print(joystickOuter.width)

this width should be 120px but is reported as 122. Measuring / counting pixels on screen shows there are 120 in width [import]uid: 5354 topic_id: 1657 reply_id: 301657[/import]

#2

Matthew,

I believe the extra pixels comes from the stroke width. The documentation for object.strokeWidth property says, “Note that stroke widths are broken up to inner and outer parts.”

-Tom [import]uid: 7559 topic_id: 1657 reply_id: 4817[/import]

#3

Hi Tom

Please run the demo or look at the code and do the math.

Radius of 59 pixels, gives object of 118px wide.

Adding a 2px stroke adds 1 px to either side, the outer part of the stroke.

This adds up to 120 px wide. Measuring a screen capture in a paint app will show the object is 120 px wide.

Asking corona the width gives 122px, doesn’t seem right to me [import]uid: 5354 topic_id: 1657 reply_id: 4821[/import]