/**
* Recursive helper for move. Uses its own helper methods, overrunsTop, Bottom, Right, and Left to
* calculate next move. Calls itself recursively when turtle hits the edge of the screen
* (overruns).
*
* @param pixels changes every time with recursive call until it is less than 0 (because of
* possible rounding errors with trig functions)
*/
protected void moveRecursiveHelper(double pixels) {
// Checkstyle and clean-up rules conflict on brackets - this is a recurring problem
// throughout our code
if (pixels <= 0 + PRECISION_LEVEL) return;
Location currentLocation = getLocation();
Location nextLocation = getLocation();
Location nextCenter = nextLocation;
nextLocation.translate(new Vector(getHeading(), pixels));
Location[] replacements = {nextLocation, nextCenter};
if (nextLocation.getY() < 0) {
// top
replacements = overrunsTop();
} else if (nextLocation.getY() > myCanvasBounds.getHeight()) {
// bottom
replacements = overrunBottom();
} else if (nextLocation.getX() > myCanvasBounds.getWidth()) {
// right
replacements = overrunRight();
} else if (nextLocation.getX() < 0) {
// left
replacements = overrunLeft();
}
nextLocation = replacements[0];
nextCenter = replacements[1];
setCenter(nextCenter);
double newPixels = pixels - (Vector.distanceBetween(currentLocation, nextLocation));
if (myPenDown) {
myLine.addLineSegment(currentLocation, nextLocation);
}
moveRecursiveHelper(newPixels);
}
/**
* Moves turtle to location **AS IN VIEW'S COORDINATES**
*
* @param location to move to
* @return distance of move
*/
protected int setLocation(Location location) {
double heading = getHeading();
towards(location);
int distance =
(int) Vector.distanceBetween(getLocation(), convertFromViewCoordinates(location));
move(distance);
setHeading(heading);
return distance;
}
