CODEWITHSUNDEEP
qtqml
Aquarius_Girl
Aquarius_Girl

Reputation: 22906

Understanding QML Rotation Element

I think that first one out of the following states the point in the coordinate system where we wish to place the image. Correct?

What does the other one exactly say in layman's terms?

http://harmattan-dev.nokia.com/docs/platform-api-reference/xml/daily-docs/libqt4/qml-rotation.html#axis.x-prop

axis.x : real

axis.y : real

axis.z : real

The axis to rotate around. For simple (2D) rotation around a point, you do not need to specify an axis, as the default axis is the z axis (axis { x: 0; y: 0; z: 1 }).

and

origin.x : real

origin.y : real

The origin point of the rotation (i.e., the point that stays fixed relative to the parent as the rest of the item rotates). By default the origin is 0, 0.

Upvotes: 1

Views: 1495

Answers (1)

Sebastian Lange
Sebastian Lange

Reputation: 4029

Not correct.

The first is the axis which will rotated. X is horizontal axis = Rotation will be to the viewer from top to bottom. Y is vertical axis = Rotation will be to the viewer form left to right. Z (the default) is perpendicular to the other 2 axis and is pointing to the viewer = Therefor rotation around Z is rotating on the screen-plane.

In the first parameter you just tell which axes to rotate around. So axis(x:0; y:0; z:1) just means to rotate on the screen plane.

The second are the origin-coordinates. This is the fixpoint where 0/0/0 of the axis coordinate system to rotate around is located. If this is the top-left corner of your object, you will rotate around that corner. You can rotate to any fixpoint, this also means: fixpoints other then the center point will always move your object.

Upvotes: 1

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