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make scrolling smooth.

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svn-id: r16005
This commit is contained in:
Robert Göffringmann 2004-12-09 21:32:02 +00:00
parent 9f5bd8510d
commit 3bd97accd4
1 changed files with 7 additions and 5 deletions
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12
sword1/screen.cpp
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@ -89,12 +89,14 @@ void Screen::setScrolling(int16 offsetX, int16 offsetY) {
_fullRefresh = true;
_oldScrollX = Logic::_scriptVars[SCROLL_OFFSET_X];
_oldScrollY = Logic::_scriptVars[SCROLL_OFFSET_Y];
int32 distX = inRange(-MAX_SCROLL_DISTANCE, _oldScrollX - offsetX, MAX_SCROLL_DISTANCE);
int32 distY = inRange(-MAX_SCROLL_DISTANCE, _oldScrollY - offsetY, MAX_SCROLL_DISTANCE);
if ((distX != 0) || (distY != 0))
int dx = offsetX - Logic::_scriptVars[SCROLL_OFFSET_X];
int dy = offsetY - Logic::_scriptVars[SCROLL_OFFSET_Y];
int scrlDistX = inRange(-MAX_SCROLL_DISTANCE, ((1 + ABS(dx)) / SCROLL_FRACTION) * ((dx > 0) ? 1 : -1), MAX_SCROLL_DISTANCE);
int scrlDistY = inRange(-MAX_SCROLL_DISTANCE, ((1 + ABS(dy)) / SCROLL_FRACTION) * ((dy > 0) ? 1 : -1), MAX_SCROLL_DISTANCE);
if ((scrlDistX != 0) || (scrlDistY != 0))
_fullRefresh = true;
Logic::_scriptVars[SCROLL_OFFSET_X] -= distX;
Logic::_scriptVars[SCROLL_OFFSET_Y] -= distY;
Logic::_scriptVars[SCROLL_OFFSET_X] = inRange(0, Logic::_scriptVars[SCROLL_OFFSET_X] + scrlDistX, Logic::_scriptVars[MAX_SCROLL_OFFSET_X]);
Logic::_scriptVars[SCROLL_OFFSET_Y] = inRange(0, Logic::_scriptVars[SCROLL_OFFSET_Y] + scrlDistY, Logic::_scriptVars[MAX_SCROLL_OFFSET_Y]);
}
}