Problem decrementing in Java with '-='
- by hanesjw
I'm making a scrolling game on Android and am having a hard time figuring out why the code below does not decrement past 0.
Objects start at the end of the screen (so the x position is equal to the width of the screen) the objects move accross the screen by decrementing their x positions. I want them to scroll off of the screen, but when the x position hits 0, the objects just stay at 0, they do not move into the negatives.
Here is my code to move objects on the screen
private void incrementPositions(long delta) {
float incrementor = (delta / 1000F) * Globals.MAP_SECTION_SPEED;
for(Map.Entry<Integer, HashMap<Integer, MapSection>> column : scrollingMap.entrySet()) {
for(Map.Entry<Integer, MapSection> row : column.getValue().entrySet()) {
MapSection section = row.getValue();
section.x -= incrementor;
}
}
}
It works ok if I change
section.x -= incrementor;
to
section.x = section.x - (int)incrementor;
but if i do that the scrolling doesn't appear as smooth.
