how to turn an object 90 degrees to the direction of the key you pressed (up, down, left, right)
agray11202 wrote ...
2017/12/21
help!
Do you mean you want to turn to the right side when the right arrow key is pressed? For example if the current rotation is 180° (facing left), what should the rotation be when you press the right arrow key? 0° (facing right) or turning right 90° from left which then would be 270° (or 90°?).
In the future, please use a real description for the discussion and not 'help!'.
First, determine which direction the actor should turn toward, then turn toward that direction. There are two possible horizontal and two possible vertical directions and only one of the two, horizontal or vertical, can be allowed at one time.
int dx = 0; // for horizontal direction
if (Greenfoot.isKeyDown("left")) dx--;
if (Greenfoot.isKeyDown("right")) dx++;
int dy = 0; // for vertical direction
if (Greenfoot.isKeyDown("up")) dy--;
if (Greenfoot.isKeyDown("down")) dy++;
if (dx*dy == 0 && dx+dy != 0) // if one is zero and the other is not
{
int rotation = 0;
if (dx != 0) rotation = 90*(1-dx); // horizontal
else rotation = 90*(2-dy); // vertical
setRotation(rotation); // turn
}Thank you so much danpost!!! Just wondering, does this code go in my act method or should I create another method to put it in?
Either in the act method or a method which you call from the act method. There is nothing wrong about just putting it into the act method.
You need to login to post a reply.