Part 13 - terrain and smoke effects

effects/Smoke.tscn

@@ -0,0 +1,104 @@
+[gd_scene load_steps=8 format=2]
+
+[sub_resource type="Gradient" id=1]
+
+offsets = PoolRealArray( 0, 0.207101, 1 )
+colors = PoolColorArray( 0.945312, 0.420152, 0.0369263, 1, 0.542969, 0.538727, 0.538727, 1, 0, 0, 0, 0 )
+
+[sub_resource type="GradientTexture" id=2]
+
+flags = 4
+gradient = SubResource( 1 )
+width = 2048
+
+[sub_resource type="Curve" id=4]
+
+min_value = 0.0
+max_value = 1.0
+bake_resolution = 100
+_data = [ Vector2( 0, 0.5 ), 0.0, 3.92898, 0, 0, Vector2( 1, 1 ), 0.0, 0.0, 0, 0 ]
+
+[sub_resource type="CurveTexture" id=5]
+
+flags = 4
+width = 2048
+curve = SubResource( 4 )
+
+[sub_resource type="Curve" id=6]
+
+min_value = -200.0
+max_value = 200.0
+bake_resolution = 100
+_data = [ Vector2( 0, -141.797 ), 0.0, 0.0, 0, 0, Vector2( 1, 200 ), -62.6108, 0.0, 0, 0 ]
+
+[sub_resource type="CurveTexture" id=7]
+
+flags = 4
+width = 2048
+curve = SubResource( 6 )
+
+[sub_resource type="ParticlesMaterial" id=3]
+
+render_priority = 0
+trail_divisor = 1
+emission_shape = 2
+emission_box_extents = Vector3( 5, 12, 1 )
+flag_align_y = false
+flag_rotate_y = false
+flag_disable_z = true
+spread = 15.0
+flatness = 0.0
+gravity = Vector3( 0, 0, 0 )
+initial_velocity = 40.0
+initial_velocity_random = 1.0
+angular_velocity = 0.0
+angular_velocity_random = 0.0
+orbit_velocity = 0.0
+orbit_velocity_random = 0.0
+linear_accel = 0.0
+linear_accel_random = 0.0
+radial_accel = 0.0
+radial_accel_random = 0.0
+tangential_accel = 50.0
+tangential_accel_random = 0.0
+tangential_accel_curve = SubResource( 7 )
+damping = 0.0
+damping_random = 0.0
+angle = 0.0
+angle_random = 0.0
+scale = 20.0
+scale_random = 0.0
+scale_curve = SubResource( 5 )
+color_ramp = SubResource( 2 )
+hue_variation = 0.0
+hue_variation_random = 0.0
+anim_speed = 0.0
+anim_speed_random = 0.0
+anim_offset = 0.0
+anim_offset_random = 0.0
+anim_loop = false
+_sections_unfolded = [ "Color", "Emission Shape", "Gravity", "Initial Velocity", "Scale", "Spread", "Tangential Accel" ]
+
+[node name="Smoke" type="Particles2D"]
+
+emitting = true
+amount = 50
+lifetime = 0.75
+one_shot = false
+preprocess = 0.0
+speed_scale = 1.0
+explosiveness = 0.0
+randomness = 0.0
+fixed_fps = 0
+fract_delta = true
+visibility_rect = Rect2( -100, -100, 200, 200 )
+local_coords = false
+draw_order = 0
+process_material = SubResource( 3 )
+texture = null
+normal_map = null
+h_frames = 1
+v_frames = 1
+_sections_unfolded = [ "Drawing", "Process Material", "Time", "Transform" ]
+
+

globals.gd

@@ -0,0 +1,3 @@
+extends Node
+
+var slow_terrain = [0, 10, 20, 30, 7, 8, 17, 18]

maps/Map.gd

@@ -3,6 +3,7 @@ extends Node2D
 func _ready():
 	set_camera_limits()
 	Input.set_custom_mouse_cursor(load("res://assets/UI/crossair_black.png"), Input.CURSOR_ARROW, Vector2(16, 16))
+	$Player.map = $Ground
 
 func set_camera_limits():
 	var map_limits = $Ground.get_used_rect()

maps/Map01.tscn

@@ -57,7 +57,7 @@ __meta__ = {
 
 [node name="Player" parent="." index="2" instance=ExtResource( 4 )]
 
-position = Vector2( 2420.48, 1359.13 )
+position = Vector2( 2445.23, 1352.53 )
 
 [node name="Paths" type="Node2D" parent="." index="3"]
 
@@ -80,6 +80,7 @@ lookahead = 4.0
 
 [node name="EnemyTank" parent="Paths/Path2D/PathFollow2D" index="0" instance=ExtResource( 5 )]
 
+_sections_unfolded = [ "Collision", "Transform", "collision" ]
 Bullet = ExtResource( 6 )
 max_speed = 175
 gun_shots = 3
@@ -105,6 +106,7 @@ lookahead = 4.0
 
 [node name="EnemyTank" parent="Paths/Path2D2/PathFollow2D" index="0" instance=ExtResource( 5 )]
 
+_sections_unfolded = [ "Collision", "Transform", "collision" ]
 max_speed = 150
 rotation_speed = 0.0
 turret_speed = 3.0
@@ -113,6 +115,7 @@ detect_radius = 450
 [node name="GunTurret" parent="." index="4" instance=ExtResource( 7 )]
 
 position = Vector2( 2308.93, 396.547 )
+offroad_friction = null
 
 [node name="Obstacles" type="Node2D" parent="." index="5"]
 

project.godot

@@ -13,6 +13,10 @@ config_version=3
 config/name="Top-down Tank Battle"
 config/icon="res://icon.png"
 
+[autoload]
+
+GLOBALS="*res://globals.gd"
+
 [display]
 
 window/stretch/mode="2d"

tanks/EnemyTank.tscn

@@ -47,7 +47,7 @@ _sections_unfolded = [ "Transform" ]
 position = Vector2( 55, 0 )
 offset = Vector2( 23, 0 )
 region_rect = Rect2( 644, 94, 50, 40 )
-_sections_unfolded = [ "Offset", "Region", "Transform", "Visibility" ]
+_sections_unfolded = [ "Offset", "Region", "Transform", "Visibility", "Z Index" ]
 
 [node name="DetectRadius" type="Area2D" parent="." index="4"]
 

tanks/Player.tscn

@@ -15,7 +15,7 @@ position = Vector2( 741.177, 459.959 )
 collision_layer = 2
 collision_mask = 5
 script = ExtResource( 2 )
-_sections_unfolded = [ "Collision", "collision" ]
+_sections_unfolded = [ "Collision", "Transform", "collision" ]
 Bullet = ExtResource( 3 )
 max_speed = 200
 rotation_speed = 1.0

tanks/Tank.gd

@@ -10,6 +10,7 @@ export (int) var max_speed
 export (float) var rotation_speed
 export (float) var gun_cooldown
 export (int) var max_health
+export (float) var offroad_friction
 
 export (int) var gun_shots = 1
 export (float, 0, 1.5) var gun_spread = 0.2
@@ -20,9 +21,11 @@ var velocity = Vector2()
 var can_shoot = true
 var alive = true
 var health
+var map
 
 func _ready():
 	health = max_health
+	$Smoke.emitting = false
 	emit_signal('health_changed', health * 100/max_health)
 	emit_signal('ammo_changed', ammo * 100/max_ammo)
 	$GunTimer.wait_time = gun_cooldown
@@ -48,18 +51,26 @@ func _physics_process(delta):
 	if not alive:
 		return
 	control(delta)
+	if map:
+		var tile = map.get_cellv(map.world_to_map(position))
+		if tile in GLOBALS.slow_terrain:
+			velocity *= offroad_friction
 	move_and_slide(velocity)
 
 func take_damage(amount):
 	health -= amount
 	emit_signal('health_changed', health * 100/max_health)
+	if health < max_health / 2:
+		$Smoke.emitting = true
 	if health <= 0:
 		explode()
 
 func heal(amount):
 	health += amount
 	health = clamp(health, 0, max_health)
 	emit_signal('health_changed', health * 100/max_health)
+	if health >= max_health / 2:
+		$Smoke.emitting = false
 
 func explode():
 	$CollisionShape2D.disabled = true

tanks/Tank.tscn

@@ -1,8 +1,9 @@
-[gd_scene load_steps=6 format=2]
+[gd_scene load_steps=7 format=2]
 
 [ext_resource path="res://tanks/Tank.gd" type="Script" id=1]
 [ext_resource path="res://assets/onlyObjects_retina_rotated.png" type="Texture" id=2]
-[ext_resource path="res://effects/Explosion.tscn" type="PackedScene" id=3]
+[ext_resource path="res://effects/Smoke.tscn" type="PackedScene" id=3]
+[ext_resource path="res://effects/Explosion.tscn" type="PackedScene" id=4]
 
 [sub_resource type="Animation" id=1]
 
@@ -61,11 +62,13 @@ collision_layer = 1
 collision_mask = 1
 collision/safe_margin = 0.08
 script = ExtResource( 1 )
+_sections_unfolded = [ "Transform" ]
 Bullet = null
 max_speed = null
 rotation_speed = null
 gun_cooldown = null
 max_health = null
+offroad_friction = 0.75
 gun_shots = 1
 gun_spread = 0.2
 max_ammo = 20
@@ -79,7 +82,13 @@ _sections_unfolded = [ "Region" ]
 
 [node name="CollisionShape2D" type="CollisionShape2D" parent="." index="1"]
 
-[node name="Turret" type="Sprite" parent="." index="2"]
+[node name="Smoke" parent="." index="2" instance=ExtResource( 3 )]
+
+position = Vector2( -25, 0 )
+rotation = -3.14159
+draw_order = 1
+
+[node name="Turret" type="Sprite" parent="." index="3"]
 
 texture = ExtResource( 2 )
 region_enabled = true
@@ -95,14 +104,14 @@ texture = ExtResource( 2 )
 region_enabled = true
 _sections_unfolded = [ "Region", "Transform", "Visibility", "Z Index" ]
 
-[node name="GunTimer" type="Timer" parent="." index="3"]
+[node name="GunTimer" type="Timer" parent="." index="4"]
 
 process_mode = 1
 wait_time = 1.0
 one_shot = false
 autostart = false
 
-[node name="AnimationPlayer" type="AnimationPlayer" parent="." index="4"]
+[node name="AnimationPlayer" type="AnimationPlayer" parent="." index="5"]
 
 root_node = NodePath("..")
 autoplay = "init"
@@ -113,7 +122,7 @@ anims/init = SubResource( 1 )
 anims/muzzle_flash = SubResource( 2 )
 blend_times = [  ]
 
-[node name="Explosion" parent="." index="5" instance=ExtResource( 3 )]
+[node name="Explosion" parent="." index="6" instance=ExtResource( 4 )]
 
 visible = false