68 lines
1.6 KiB
Dart
68 lines
1.6 KiB
Dart
import 'dart:html' as html;
|
|
|
|
import 'package:rules_of_living/Cell.dart';
|
|
import 'package:rules_of_living/Grid.dart';
|
|
|
|
class App {
|
|
// Elapsed Time Counter - useful for Safety Timeout
|
|
Stopwatch _elapsed = new Stopwatch();
|
|
|
|
// Game Tick Rate - *does* impact game speed
|
|
int _MS_PER_STEP = 1000 ~/ 3;
|
|
|
|
// Max Frame (i.e. Rendering) rate - does *not* impact game speed
|
|
final int _MS_PER_FRAME = 1000 ~/ 30;
|
|
|
|
// ms stuck in updateloop after which game will declare itself unresponsive
|
|
final int SAFETY_TIMEOUT = 2000;
|
|
|
|
num _updateLag = 0.0;
|
|
num _drawLag = 0.0;
|
|
|
|
|
|
final html.CanvasElement canvas;
|
|
Grid grid = new Grid(100,100);
|
|
bool running = false;
|
|
|
|
App(this.canvas) {
|
|
_elapsed.start();
|
|
var runBtn = html.querySelector("#run");
|
|
runBtn.onClick.forEach((html.MouseEvent mouse) {
|
|
running = !running;
|
|
if(running) runBtn.innerHtml = "Stop";
|
|
if(!running) runBtn.innerHtml = "Start";
|
|
});
|
|
}
|
|
|
|
void process(num now) {
|
|
_drawLag+= _elapsed.elapsedMilliseconds;
|
|
_updateLag += _elapsed.elapsedMilliseconds;
|
|
_elapsed.reset();
|
|
|
|
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;
|
|
}
|
|
update();
|
|
_updateLag -= _MS_PER_STEP;
|
|
}
|
|
|
|
if (_drawLag >= _MS_PER_FRAME) {
|
|
render(_updateLag / _MS_PER_STEP);
|
|
_drawLag = 0;
|
|
}
|
|
}
|
|
|
|
void update() {
|
|
// print("updating");
|
|
if (running) grid.update();
|
|
}
|
|
|
|
|
|
void render([num interp]) {
|
|
// print("rendering");
|
|
grid.render(canvas, interp);
|
|
}
|
|
} |