From dad7546099235129a4506bb70e416e5652fc0cd4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Davy=20H=C3=A9lard?= <davy.helard@gmail.com>
Date: Thu, 9 Oct 2025 18:49:56 +0200
Subject: [PATCH] Display the 2D particle emitter renderer

---
 .../particleemitterobject-pixi-renderer.ts    | 53 ++++++++++++++++++-
 .../ParticleSystem/particleemitterobject.ts   | 12 +++++
 2 files changed, 64 insertions(+), 1 deletion(-)

diff --git a/Extensions/ParticleSystem/particleemitterobject-pixi-renderer.ts b/Extensions/ParticleSystem/particleemitterobject-pixi-renderer.ts
index 5de116b6b8..8070e48d4e 100644
--- a/Extensions/ParticleSystem/particleemitterobject-pixi-renderer.ts
+++ b/Extensions/ParticleSystem/particleemitterobject-pixi-renderer.ts
@@ -18,12 +18,15 @@ namespace gdjs {
     renderer: PIXI.Container;
     emitter: PIXI.particles.Emitter;
     started: boolean = false;
+    helperGraphics: PIXI.Graphics | null = null;
+    runtimeObject: gdjs.ParticleEmitterObject;
 
     constructor(
       instanceContainer: gdjs.RuntimeInstanceContainer,
-      runtimeObject: gdjs.RuntimeObject,
+      runtimeObject: gdjs.ParticleEmitterObject,
       objectData: any
     ) {
+      this.runtimeObject = runtimeObject;
       const pixiRenderer = instanceContainer
         .getGame()
         .getRenderer()
@@ -223,6 +226,44 @@ namespace gdjs {
       if (!this.started && wasEmitting) {
         this.started = true;
       }
+      if (this.helperGraphics) {
+        this.helperGraphics.clear();
+        this.helperGraphics.position.x = this.runtimeObject.getX();
+        this.helperGraphics.position.y = this.runtimeObject.getY();
+
+        const emitterAngle = gdjs.toRad(this.runtimeObject.getAngle());
+        const sprayConeAngle = gdjs.toRad(
+          this.runtimeObject.getConeSprayAngle()
+        );
+        const line1Angle = emitterAngle - sprayConeAngle / 2;
+        const line2Angle = emitterAngle + sprayConeAngle / 2;
+        const length = 64;
+
+        this.helperGraphics.beginFill(0, 0);
+        this.helperGraphics.lineStyle(
+          3,
+          this.runtimeObject.getParticleColorEnd(),
+          1
+        );
+        this.helperGraphics.moveTo(0, 0);
+        this.helperGraphics.lineTo(
+          Math.cos(line1Angle) * length,
+          Math.sin(line1Angle) * length
+        );
+        this.helperGraphics.moveTo(0, 0);
+        this.helperGraphics.lineTo(
+          Math.cos(line2Angle) * length,
+          Math.sin(line2Angle) * length
+        );
+        this.helperGraphics.endFill();
+
+        this.helperGraphics.lineStyle(0, 0x000000, 1);
+        this.helperGraphics.beginFill(
+          this.runtimeObject.getParticleColorStart()
+        );
+        this.helperGraphics.drawCircle(0, 0, 8);
+        this.helperGraphics.endFill();
+      }
     }
 
     setPosition(x: number, y: number): void {
@@ -443,6 +484,16 @@ namespace gdjs {
     }
 
     private static readonly frequencyMinimumValue = 0.0001;
+
+    setHelperVisible(visible: boolean) {
+      if (visible && !this.helperGraphics) {
+        this.helperGraphics = new PIXI.Graphics();
+        this.renderer.addChild(this.helperGraphics);
+      } else if (!visible && this.helperGraphics) {
+        this.helperGraphics.destroy();
+        this.helperGraphics = null;
+      }
+    }
   }
 
   // @ts-ignore - Register the class to let the engine use it.
diff --git a/Extensions/ParticleSystem/particleemitterobject.ts b/Extensions/ParticleSystem/particleemitterobject.ts
index 15309e1d32..95bcbbf323 100644
--- a/Extensions/ParticleSystem/particleemitterobject.ts
+++ b/Extensions/ParticleSystem/particleemitterobject.ts
@@ -174,6 +174,10 @@ namespace gdjs {
         this,
         particleObjectData
       );
+      if (instanceContainer.getGame().isInGameEdition()) {
+        // TODO Disable the particles rendering
+        this._renderer.setHelperVisible(true);
+      }
       this.angleA = particleObjectData.emitterAngleA;
       this.angleB = particleObjectData.emitterAngleB;
       this.forceMin = particleObjectData.emitterForceMin;
@@ -802,6 +806,14 @@ namespace gdjs {
       }
     }
 
+    getParticleColorStart(): number {
+      return this.color1;
+    }
+
+    getParticleColorEnd(): number {
+      return this.color2;
+    }
+
     getParticleRed1(): number {
       return gdjs.hexNumberToRGBArray(this.color1)[0];
     }