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Doge
Doge wrote ...

2014/1/5

Rotating from a point?

Doge Doge

2014/1/5

#
http://www.greenfoot.org/scenarios/10534 I don't want the tower to rotate from the middle, I want it to rotate from the tower! Any way I can achieve this?
danpost danpost

2014/1/5

#
There are (at least) two ways of accomplishing this: (1) make any turn adjustments, then (a) set location (b) turn 90 (c) move a 'radial' distance and (d) turn -90; or, (2) increase the transparent area above the image to make the point of rotation the center point
Doge Doge

2014/1/5

#
Do you have any advice about going about #1?
danpost danpost

2014/1/5

#
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private int initX, initY;
 
public void addedToWorld(World w)
{
    initX = getX();
    initY = getY()-10; // adjust radius as needed
}
Adding the above to your actor subclass will save the center of rotation for the actor you added into the world. In your 'act' method
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// any turning that needs done gets done before the following
setLocation(initX, initY); // put in center
turn(90); // alter rotation
move(10); // move from center (adjust radius as needed)
turn(-90); // reset rotation
The radial distance ('10' in the example) will be the distance between the center of the image and the center point of rotation (the tower).
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