X-Git-Url: http://nitlanguage.org

diff --git a/lib/gamnit/examples/asteronits/src/game_logic.nit b/lib/gamnit/examples/asteronits/src/game_logic.nit
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-# This file is part of NIT ( http://www.nitlanguage.org ).
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# Pure game logic, independent of gamnit and other display concerns
-module game_logic
-
-import geometry::points_and_lines
-
-# Root of all entities of a single play
-class World
-
-	# Number of original asteroids per play
-	var n_asteroids: Int
-
-	# Number of parts created when an asteroid explodes
-	var n_asteroid_parts: Int
-
-	# Ratio of the world: height / width
-	var ratio_height_width: Float
-
-	# Minimum half size of the world, applied either to `half_width` of `half_height`
-	private var min_half_size = 500.0
-
-	# Width of the world
-	var half_width: Float = if ratio_height_width <= 1.0 then
-			min_half_size
-		else min_half_size * ratio_height_width is lazy
-
-	# Height of the world
-	var half_height: Float = if ratio_height_width >= 1.0 then
-			min_half_size
-		else min_half_size / ratio_height_width is lazy
-
-	# Player's ship
-	var ship = new Ship(self)
-
-	# All live spacial objects
-	var objects = new Array[SpacialObject].with_items(ship)
-
-	# All live asteroids
-	var asteroids = new Array[Asteroid]
-
-	# All live bullets
-	var bullets = new Array[SpacialObject]
-
-	init
-	do
-		for a in n_asteroids.times do
-			var asteroid = new Asteroid(self, 3)
-			asteroid.center.x = half_width - 2.0*half_width.rand
-			asteroid.center.y = half_height - 2.0*half_height.rand
-			asteroid.rotation_inertia = 0.5 - 1.0.rand
-
-			objects.add asteroid
-			asteroids.add asteroid
-		end
-	end
-
-	# Execute a turn that took `dt` seconds
-	fun do_turn(dt: Float)
-	do
-		for object in objects do object.do_turn dt
-
-		for object in objects.to_a do if not object isa Asteroid then
-
-			for asteroid in asteroids.to_a do
-				var d2 = object.center.dist2(asteroid.center)
-
-				var r = object.radius + asteroid.radius
-				if d2 < r*r then
-					# Boom
-					if object == ship then
-						# The ship is invincible
-						# TODO health and losing
-					else
-						object.destroy
-					end
-
-					asteroid.destroy
-					break
-				end
-			end
-		end
-	end
-end
-
-# Physical object in space physics
-abstract class SpacialObject
-
-	# World in which this object belongs
-	var world: World
-
-	# Current position
-	var center = new Point3d[Float](0.0, 0.0, 0.0)
-
-	# Position inertia, applied on `center` at each `do_turn`
-	var inertia = new Point3d[Float](0.0, 0.0, 0.0)
-
-	# Current rotation
-	var rotation = 0.0
-
-	# Rotation inertia, applied on `rotation` at each `do_turn`
-	var rotation_inertia = 0.0
-
-	# Rotation force, currently applied by the pilot
-	var applied_rotation = 0.0 is writable
-
-	# Thrust force, currently applied by the pilot
-	var applied_thrust = 0.0 is writable
-
-	# Radius of this object for collision detection
-	var radius: Float is noinit
-
-	# New instance copying the data from `other` with an optional `variation`
-	init copy(other: SpacialObject, variation: nullable Float)
-	do
-		init other.world
-
-		if variation == null then variation = 0.0
-
-		center.x = other.center.x
-		center.y = other.center.y
-		center.z = other.center.z
-
-		inertia.x = other.inertia.x + variation - 2.0*variation.rand
-		inertia.y = other.inertia.y + variation - 2.0*variation.rand
-
-		rotation = other.rotation
-		if variation != 0.0 then rotation = 2.0 * pi.rand
-	end
-
-	# Apply `thrust` forward on this object
-	fun apply_thrust(thrust: Float)
-	do
-		inertia.x += thrust * rotation.cos
-		inertia.y += thrust * rotation.sin
-	end
-
-	# Execute a turn that took `dt` seconds
-	fun do_turn(dt: Float)
-	do
-		# Forces to inertia
-		var t = applied_thrust * 5.0
-		inertia.x += t * rotation.cos
-		inertia.y += t * rotation.sin
-
-		# Arcade rotation
-		var r = applied_rotation * 0.05
-		rotation += r
-
-		# Realistic rotation, kept for reference and reality minded individuals
-		#var r = applied_rotation * 0.2
-		#rotation_inertia += r
-		#rotation_inertia = rotation_inertia.min(2.0).max(-2.0)
-
-		# Inertia to position
-		rotation += rotation_inertia * dt
-		center.x += inertia.x * dt
-		center.y += inertia.y * dt
-		center.z += inertia.z * dt
-
-		# Wrap objects so they stay in the screen
-		while center.x < -world.half_width do center.x += 2.0 * world.half_width
-		while center.x > world.half_width do center.x -= 2.0 * world.half_width
-		while center.y < -world.half_height do center.y += 2.0 * world.half_height
-		while center.y > world.half_height do center.y -= 2.0 * world.half_height
-	end
-
-	# Destroy this object
-	fun destroy do world.objects.remove self
-end
-
-# Player's ship
-class Ship
-	super SpacialObject
-
-	init do radius = 20.0
-
-	# Open fire forward
-	fun fire
-	do
-		var bullet = new Bullet.copy(world.ship)
-		bullet.center.z = -1.0 # in the background
-		bullet.apply_thrust 500.0 # give a boost
-
-		world.objects.add bullet
-		world.bullets.add bullet
-	end
-end
-
-# Asteroid, the main obstacle in this game
-class Asteroid
-	super SpacialObject
-
-	# Size of this asteroid, should be greater than 0
-	var size: Int
-
-	# Color, or type, on this asteroid
-	var color: Int = 2.rand
-
-	init
-	do
-		rotation_inertia = 0.5 - 1.0.rand
-		radius = 22.5 * size.to_f
-	end
-
-	# New asteroid breaking off from `other`
-	init break_off(other: Asteroid)
-	do
-		size = other.size - 1
-		color = other.color
-
-		copy(other, 60.0)
-	end
-
-	# Explode and break off this asteroid
-	redef fun destroy
-	do
-		super
-
-		world.asteroids.remove self
-
-		if size == 1 then return # Do not break off
-
-		for p in world.n_asteroid_parts.times do
-			var asteroid = new Asteroid.break_off(self)
-			asteroid.size = size - 1
-			asteroid.color = color
-
-			asteroid.inertia.x += 1.0 - 2.0.rand
-			asteroid.inertia.y += 1.0 - 2.0.rand
-
-			world.objects.add asteroid
-			world.asteroids.add asteroid
-		end
-	end
-end
-
-# Bullet or beam fired from a `Ship`
-class Bullet
-	super SpacialObject
-
-	# Time left before this bullet expires
-	var ttl = 5.0
-
-	init do radius = 0.0
-
-	redef fun do_turn(dt)
-	do
-		super
-
-		ttl -= dt
-		if ttl <= 0.0 then destroy
-	end
-
-	redef fun destroy
-	do
-		super
-		world.bullets.remove self
-	end
-end