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spaceinvaders.dart
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spaceinvaders.dart
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part of spaceinvaders;
class Publisher {
var scoreLabel= "";
setScore (int score){
scoreLabel = "${score} Point${score > 1 ? 's': ''}";
js.scoped(() {
js.context.setScoreLabel(scoreLabel);
});
}
}
class Resources {
Map imgs = {};
Element operator [](String key) => imgs[key];
Future loadImages (){
return Futures.wait(Images.allPaths.map((path) => Images.loadImage(path)));
}
}
class Alien extends Drawable{
static final height = 30;
static final width = 30;
var sens = 1;
var life = 1;
Alien (stage, [x, y]): super(stage, x, y){
img = resources[Images.ALIEN];
}
render (double time){
var nextX = x + (time * 0.4 * sens).toInt();
if (nextX <= Stage.width - width && nextX >= 0){
x = nextX;
} else{
y+=40;
sens *=-1;
}
super.render(time);
}
decreaseLive (){
life--;
}
mutate (){
return new VeryBadAlien.fromAlien(this);
}
get isAlive => life > 0;
}
class VeryBadAlien extends Alien{
var life = 2;
VeryBadAlien.fromAlien (Alien alien) : super(alien.stage, alien.x, alien.y){
sens = alien.sens;
img = resources[Images.BAD_ALIEN];
}
mutate (){
return this;
}
}
class Ship extends Drawable{
static int width= 34;
static int height= 25;
static const SPEED= 10;
var keyUpHandler;
Ship(Stage stage, [int x, int y]) : super(stage, x, y){
img = resources[Images.SHIP];
keyUpHandler = onKeyUp;
window.on.keyUp.add(keyUpHandler);
}
render(time){
super.render(time);
}
destroy(){
super.destroy();
window.on.keyUp.remove(keyUpHandler);
}
moveLeft(){
var nextX = x - SPEED;
x = (nextX >= 0) ? nextX : 0;
}
moveRight(){
var nextX = x + SPEED;
var rigthLimit = Stage.width-width;
x = (nextX+width <= rigthLimit) ? nextX : rigthLimit;
}
fire (){
new Projectile (stage, (x+(width/2)).toInt(), y);
}
onKeyUp (KeyboardEvent event){
if (event.keyCode == KeyCode.LEFT) moveLeft();
else if (event.keyCode == KeyCode.RIGHT) moveRight();
else if (event.keyCode == KeyCode.SPACE) fire();
}
}