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Gnat class
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| class Gnat extends SpriteComponent with Tapable { | |
| Sprite sprite; | |
| double xMax, yMax; | |
| double xSpeed, ySpeed; | |
| double spriteSize; | |
| final spriteSpeed = 18.0; | |
| final spriteMin = 30.0; | |
| final spriteMax = 60.0; | |
| bool wall = false; | |
| bool remove = false; | |
| Gnat(this.sprite) : super.fromSprite(16.0, 16.0, sprite); | |
| @override | |
| void resize(Size size) { | |
| Random random = Random(); | |
| spriteSize = spriteMin + random.nextDouble() * (spriteMax - spriteMin); | |
| width = spriteSize; | |
| height = spriteSize; | |
| xMax = size.width; | |
| x = random.nextDouble() * (xMax - width); | |
| xSpeed = 120.0 + random.nextDouble() * 120.0; | |
| if (random.nextBool()) xSpeed = -xSpeed; | |
| yMax = size.height; | |
| y = random.nextDouble() * (yMax - height); | |
| ySpeed = 60.0 + random.nextDouble() * 240.0; | |
| if (random.nextBool()) ySpeed = -ySpeed; | |
| } | |
| @override | |
| void update(double dt) { | |
| x += xSpeed * dt; | |
| if (((x >= xMax - width) && xSpeed > 0) || (x < 0.0)) { | |
| xSpeed = -xSpeed; | |
| wall = true; | |
| } | |
| y += ySpeed * dt; | |
| if (((y > yMax - height) && (ySpeed > 0)) || ((y < 35.0 && (ySpeed < 0)))) { | |
| ySpeed = -ySpeed; | |
| wall = true; | |
| } | |
| spriteSize += spriteSpeed * dt; | |
| if ((spriteSize > spriteMax) && wall) spriteSize = spriteMin; | |
| width = spriteSize; | |
| height = spriteSize; | |
| wall = false; | |
| renderFlipX = xSpeed > 0 ? false : true; | |
| angle = atan(ySpeed / xSpeed); | |
| } | |
| @override | |
| void onTapDown(TapDownDetails details) { | |
| MyGame.kills++; | |
| remove = true; | |
| } | |
| @override | |
| bool destroy() { | |
| return remove; | |
| } | |
| } |
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