I want my object to move down the screen at an angle without changing its rotation
QWERTY894 wrote ...
2013/4/28
How can I make objects move diagonally in Greenfoot?
You can rotate an object, move it, and then rotate it back immediately. The visible effect will be that it moves at a different angle to what it is facing.
I think it would be easyer to use a modified move method like this one:
In this method you can set the angle and the distance to move.
public void move(double angle, double distance) {
angle = Math.toRadians(angle);
setLocation((int) (getX() + Math.cos(angle) * distance), (int) (getY() + Math.sin(angle) * distance));
}
With the method Gevater_Tod4711 gave, your actor will be restricted to specific angles of movement. The slower your actor moves, the fewer angles that the actor can fall at (see my Radial Graphs scenario). For falling at any angle, use the following:
Please note: the 'addedToWorld' method is called automatically when the actor is placed in the world; you do not call this method in your code.
// with these fields
int direction; // the angle you want the actor to fall
int speed; // the speed you want the actor to fall
int cycle; // tracks the time that the actor falls
int initX, initY; // holds the initial location of the actor
// using this method to initialize the location fields
public void addedToWorld(World world)
{
initX = getX();
initY = getY();
}
// move the actor with this in act or method it calls
cycle++; // increment the fall time
setLocation(initX, initY); // move actor to initial location
setRotation(direction); // set direction to move
move(speed*cycle); // move appropriate distance
setRotation(0); // reset rotation of actor
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