rotate shape in vector direction about dgame HOT 14 CLOSED

Per default, Dgame uses the top left corner as origin point. You can change that by calling setRotationCenter (which only affects the rotation origin) or by calling setOrigin (which changes the whole origin, so as well the position. Or did I misunderstand you?

BTW: setRotationCenter expect the local center.

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the end result should be moving object aligned with vector (and there are multiple objects). any idea how to do that? so for i tried setting rotation center at one vertex of an object but it not work. objects drift apart with time.

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I don't understand what you mean by "aligned with (a) vector". Could you give me an example?

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an example https://processing.org/examples/flocking.html. all objects are aligned (facing same direction) as their velocity vector.

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Ah, without overlaping, I see. You could let them move in the same direction with your own offset between the objects. Wouldn't that be an option?

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yes i just need correct orientation.

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What's about setting the center of your object as rotation origin and use for all objects the same rotation direction?

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i was thinking the same thing. could not get it working with setRotationCenter. maybe it will work with setOrigin?

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What was the problem?
An example code snippet of your try would be helpful.

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i used upper left corner of an object as rotation center. this changes as object moves so objects were drifting apart too much.

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Try getClipRector getVertexRect, that wil give you the surrounding rect. On this you can call getCenter to ascertain the center point of your object.

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I would suggest that you look at atan2 for the rotation part.

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Did it work?

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yes it worked

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