Transform mouse coordinates to local space

[VoidwalkerParticipant]

Hi,

in Monkey 1 I could transform mouse coordinates into local space of an image like this:

Monkey

[crayon-5cb9e27a7193e656215093 inline="true" ] Local mx:Float = MouseX() Local my:Float = MouseY() Scale( 1.0/scaleRatio, 1.0/scaleRatio ) Transform( m[0], m[1], m[2], m[3], m[4], m[5] ) Local coords:Float[] = InvTransform( [ mx, my ] ) Local tmx:Float = coords[0] Local tmy:Float = coords[1]

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[crayon-5cb9e27a7193e656215093 inline="true" ] Local mx:Float = MouseX() Local my:Float = MouseY() Scale( 1.0/scaleRatio, 1.0/scaleRatio ) Transform( m[0], m[1], m[2], m[3], m[4], m[5] )            Local coords:Float[] = InvTransform( [ mx, my ] ) Local tmx:Float = coords[0] Local tmy:Float = coords[1]

[/crayon]

where “m” is a matrix which I got with GetMatrix() during drawing that rotated image (in a PushMatrix() / PopMatrix())

How can I achieve that in Monkey 2? Thanks

[Mark SiblyKeymaster]

Same idea, just transform the point directly, something like:

Monkey

canvas.Scale(....) canvas.Rotate(...) canvas.Translate(...) ...etc... Local localCoords:= -canvas.Matrix * Mouse.Location

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canvas.Scale(....) canvas.Rotate(...) canvas.Translate(...) ...etc... Local localCoords:= -canvas.Matrix * Mouse.Location

Note the minus sign before canvas.Matrix. This negates the current canvas matrix, so gives you the inverse transform.

[Mark SiblyKeymaster]

Actually, the simplelight banana shows you how to do this…it does a funky rotate/distort of the view and converts mouse coords to ‘local’.

[VoidwalkerParticipant]

Thank you Mark! Time to go to bed now or have you been waked up by this “emergency call test” via mobile phones in NZ?

[Author]

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