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Refactor Engine Methods

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Extract method checking for update necessity.
This commit is contained in:
Unknown 2018-10-19 11:50:34 +02:00
parent 2993b33d9e
commit e8c1e6ed8b
2 changed files with 112 additions and 16 deletions
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33
lib/src/Engine.dart
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@ -1,5 +1,4 @@
import 'dart:html' as html;
import 'dart:math';
import 'package:rules_of_living/src/Simulation.dart';
@ -47,31 +46,37 @@ class Engine {
}
void animFrame(num now) {
process(now);
int elapsed = _elapsed.elapsedMilliseconds;
_elapsed.reset();
process(elapsed, SAFETY_TIMEOUT, update: this.update, render: this.render);
html.window.animationFrame.then(animFrame);
}
void process(num now) {
_drawLag += _elapsed.elapsedMilliseconds;
_updateLag += _elapsed.elapsedMilliseconds;
_elapsed.reset();
void process(int elapsed, int timeOut, {Function update, Function render}) {
_drawLag += elapsed;
_updateLag += elapsed;
while (_updateLag >= _MS_PER_STEP) {
if (_elapsed.elapsedMilliseconds > SAFETY_TIMEOUT) {
// TODO stub - give warning etc when this occurs
print("ERROR STUCK IN UPDATE LOOP");
break;
}
if (running == true) update();
while (running == true &&
_shouldUpdate(_updateLag, elapsed, timeOut) == true) {
_updateLag -= _MS_PER_STEP;
if (update == null) break;
update();
}
if (_drawLag >= _MS_PER_FRAME) {
render(_updateLag / _MS_PER_STEP);
_drawLag = 0;
if (render == null) return;
render(_updateLag / _MS_PER_STEP);
}
}
bool _shouldUpdate(int updateLag, int elapsed, int timeOut) {
if (updateLag < _MS_PER_STEP) return false;
if (elapsed > timeOut) throw StackOverflowError;
return true;
}
/// Update Engine Logic
///
/// Updates the logic of the engine by one tick. Should usually not be called