libGDX weird sprite rotation error

[cheatsguy]

I am currently working on a project where the character's arm is rotated around based on the mouse's location, using Math.atan2(). My problem is, I want the player to be holding weapons in their hand, and it gets a little weird. I'm using the sprite class for rotated images, so I have to position and then rotate the sprite in question. Currently, this is accomplished by this:

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primaryWeaponl.setRotation(aimAngle + 90);       primaryWeaponl.setPosition(             playerScreenX + armXDis                   + (float) Math.sin(Math.toRadians(aimAngle))                   * (characterArm.getHeight()),             playerScreenY + armYDis                   - (float) Math.cos(Math.toRadians(aimAngle))                   * characterArm.getHeight());

my issue is that when I position the image, it looks just fine:


but when I add in the rotation (the first line):



I'm not sure what is causing this, but any help would be great ( sorry for the image shapes, I simply cropped them by hand  ) could it be a problem with the sprite class? I've tried setting the origin for rotation, but it doesn't seem to help.

[Nate]

You'll need to set the sprite origin to the point you want to rotate around. The origin is relative to the sprite's position (the bottom left corner).

[cheatsguy]

For some reason, setting the sprite origin is doing nothing for me. I set it to (Sprite.getWidth() - 8, 6) ( the location of the handle) and I'm still having the same issue, in the exact same location.

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[Nate]

Be sure you are calling sprite.draw(batch) and not batch.draw(sprite). This is an unfortunate API gotcha (Sprite is-a TextureRegion and should have used composition instead, can't change it now).

[cheatsguy]

I have been using sprite.draw, I'm really not sure what I'm doing wrong. Would it be helpful if I posted the entire render() loop? in the create() loop it sets the player's arm's origin just fine, so I'm not sure what the error here is :/

[Nate]

Yes of course.

[cheatsguy]

Here it is:
http://pastebin.java-gaming.org/43eff31693d

[Nate]

Don't call new in your render method.

You are changing the primaryWeaponl position based on the rotation angle. Just set the position, origin, and rotation, then draw.

I recommend creating a simpler test case where you can experiment more easily. You can use this as a base:
https://code.google.com/p/libgdx/wiki/GettingHelp#Barebones_SpriteBatch

[cheatsguy]

Thanks nate,  i'll just use the bare-bones and then see wht my issue is. Thanks

EDIT: decided to go the easy route since this has been bugging me for the past few days, and it looks nicer than it ever could the other way.