target tracer transparency

Characters/Player.cs

@@ -71,7 +71,15 @@ public sealed partial class Player : Character
     {
         base._Process(delta);
 
-        _targetTracer.Rotation = DesiredTarget.Angle();
+        float angle = DesiredTarget.Angle();
+        float deltaTheta = Mathf.Abs(_targetTracer.Rotation - angle);
+        _targetTracer.Rotation = angle;
+        // must turn > pi / 4 radians per second to increase intensity
+        _targetTracer.Intensity = Mathf.Min(_targetTracer.Intensity +
+            deltaTheta, 1);
+        _targetTracer.Intensity = Mathf.Max(_targetTracer.Intensity -
+            Mathf.Pi / 4 * (float)delta, 0);
+        GD.Print(_targetTracer.Intensity);
     }
 
     public override void _Input(InputEvent @event)

Characters/Player.tscn

@@ -245,9 +245,9 @@ tracks/2/keys = {
 "values": [false]
 }
 
-[sub_resource type="Animation" id="Animation_3w3u1"]
+[sub_resource type="Animation" id="Animation_audkv"]
-resource_name = "sword"
+resource_name = "heal"
-length = 0.3
+loop_mode = 1
 tracks/0/type = "value"
 tracks/0/imported = false
 tracks/0/enabled = true
@@ -255,10 +255,22 @@ tracks/0/path = NodePath("%Sprites/Node2D/Character:frame")
 tracks/0/interp = 1
 tracks/0/loop_wrap = true
 tracks/0/keys = {
-"times": PackedFloat32Array(0, 0.1, 0.2),
+"times": PackedFloat32Array(0),
-"transitions": PackedFloat32Array(1, 1, 1),
+"transitions": PackedFloat32Array(1),
 "update": 1,
-"values": [12, 13, 14]
+"values": [35]
+}
+tracks/1/type = "value"
+tracks/1/imported = false
+tracks/1/enabled = true
+tracks/1/path = NodePath("%Effects/HealParticles:emitting")
+tracks/1/interp = 1
+tracks/1/loop_wrap = true
+tracks/1/keys = {
+"times": PackedFloat32Array(0),
+"transitions": PackedFloat32Array(1),
+"update": 1,
+"values": [true]
 }
 
 [sub_resource type="Animation" id="Animation_60iyy"]
@@ -277,22 +289,6 @@ tracks/0/keys = {
 "values": [false]
 }
 
-[sub_resource type="Animation" id="Animation_6twa8"]
-resource_name = "heal_start"
-length = 0.25
-tracks/0/type = "value"
-tracks/0/imported = false
-tracks/0/enabled = true
-tracks/0/path = NodePath("%Sprites/Node2D/Character:frame")
-tracks/0/interp = 1
-tracks/0/loop_wrap = true
-tracks/0/keys = {
-"times": PackedFloat32Array(0),
-"transitions": PackedFloat32Array(1),
-"update": 1,
-"values": [35]
-}
-
 [sub_resource type="Animation" id="Animation_dyfl4"]
 resource_name = "heal_end"
 length = 0.001
@@ -321,9 +317,9 @@ tracks/1/keys = {
 "values": [true]
 }
 
-[sub_resource type="Animation" id="Animation_audkv"]
+[sub_resource type="Animation" id="Animation_6twa8"]
-resource_name = "heal"
+resource_name = "heal_start"
-loop_mode = 1
+length = 0.25
 tracks/0/type = "value"
 tracks/0/imported = false
 tracks/0/enabled = true
@@ -336,17 +332,21 @@ tracks/0/keys = {
 "update": 1,
 "values": [35]
 }
-tracks/1/type = "value"
+
-tracks/1/imported = false
+[sub_resource type="Animation" id="Animation_3w3u1"]
-tracks/1/enabled = true
+resource_name = "sword"
-tracks/1/path = NodePath("%Effects/HealParticles:emitting")
+length = 0.3
-tracks/1/interp = 1
+tracks/0/type = "value"
-tracks/1/loop_wrap = true
+tracks/0/imported = false
-tracks/1/keys = {
+tracks/0/enabled = true
-"times": PackedFloat32Array(0),
+tracks/0/path = NodePath("%Sprites/Node2D/Character:frame")
-"transitions": PackedFloat32Array(1),
+tracks/0/interp = 1
+tracks/0/loop_wrap = true
+tracks/0/keys = {
+"times": PackedFloat32Array(0, 0.1, 0.2),
+"transitions": PackedFloat32Array(1, 1, 1),
 "update": 1,
-"values": [true]
+"values": [12, 13, 14]
 }
 
 [sub_resource type="AnimationLibrary" id="AnimationLibrary_73mj7"]

Shaders/Scrolling.gdshader

@@ -1,8 +1,11 @@
 shader_type canvas_item;
+render_mode blend_mix;
 
 uniform float speed = 16;
 uniform vec2 direction = vec2(1, 0);
+uniform vec4 tint_color : source_color;
 
 void fragment() {
-    COLOR = texture(TEXTURE, UV  - direction * TIME * speed);
+    vec4 color = texture(TEXTURE, UV  - direction * TIME * speed);
+    COLOR = color * tint_color;
 }

UI/TargetTracer.cs

@@ -4,12 +4,17 @@ public partial class TargetTracer : Node2D
 {
     private Line2D _line;
 
-    private float Intensity
+    private float _intensity = 127;
+
+    public float Intensity
     {
-        get => SelfModulate.A;
+        get => _intensity;
         set
         {
-            SelfModulate = new Color(SelfModulate, value);
+            var color = new Color(Colors.White, value);
+            (Material as ShaderMaterial)
+                .SetShaderParameter("tint_color", color);
+            _intensity = value;
         }
     }
 

UI/TargetTracer.tscn

@@ -3,10 +3,11 @@
 [ext_resource type="Shader" path="res://Shaders/Scrolling.gdshader" id="1_1y0lt"]
 [ext_resource type="Script" path="res://UI/TargetTracer.cs" id="1_mtnfa"]
 
-[sub_resource type="ShaderMaterial" id="ShaderMaterial_hcccp"]
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_46g0j"]
 shader = ExtResource("1_1y0lt")
 shader_parameter/speed = 1.0
 shader_parameter/direction = Vector2(1, 0)
+shader_parameter/tint_color = Color(1, 1, 1, 1)
 
 [sub_resource type="Gradient" id="Gradient_0wna6"]
 interpolation_mode = 1
@@ -19,12 +20,13 @@ width = 2
 height = 1
 
 [node name="TargetTracer" type="Node2D"]
+material = SubResource("ShaderMaterial_46g0j")
 script = ExtResource("1_mtnfa")
 
 [node name="Line2D" type="Line2D" parent="."]
 z_index = 31
 texture_repeat = 2
-material = SubResource("ShaderMaterial_hcccp")
+use_parent_material = true
 scale = Vector2(1, 0.5)
 points = PackedVector2Array(0, 0, 32, 0)
 width = 2.0