From c2aab690b654e1a3b3a95e85b45ce00fb30b6a31 Mon Sep 17 00:00:00 2001
From: Alexey Andreyev <aa13q@ya.ru>
Date: Mon, 8 Feb 2021 18:39:25 +0300
Subject: [PATCH] Fancy effects: introduce Fireworks

---
 .../Component/FancyEffectsContainer.qml       | 138 +++++++++++++++++-
 1 file changed, 136 insertions(+), 2 deletions(-)

diff --git a/imports/NeoChat/Component/FancyEffectsContainer.qml b/imports/NeoChat/Component/FancyEffectsContainer.qml
index e541ca6bf..a51590e21 100644
--- a/imports/NeoChat/Component/FancyEffectsContainer.qml
+++ b/imports/NeoChat/Component/FancyEffectsContainer.qml
@@ -23,10 +23,12 @@ Item {
         snowTimer.start()
     }
 
-    function showFireworkEffect() {
-
+    function showFireworksEffect() {
+        fireworksTimer.start()
     }
 
+    // Confetti
+
     Timer {
         id: confettiTimer
         interval: item.effectInterval;
@@ -86,6 +88,8 @@ Item {
         }
     }
 
+    // Snow
+
     Timer {
         id: snowTimer
         interval: item.effectInterval;
@@ -148,4 +152,134 @@ Item {
             }
         }
     }
+
+    // Fireworks
+
+    Timer {
+        id: fireworksTimer
+        interval: item.effectInterval;
+        running: false;
+        repeat: false;
+        triggeredOnStart: true;
+        onTriggered: {
+            if (item.enabled) {
+                fireworksInternalTimer.running = !fireworksInternalTimer.running
+            }
+        }
+    }
+
+    Timer {
+        id: fireworksInternalTimer
+        interval: 300
+        triggeredOnStart: true
+        running: false
+        repeat: true
+        onTriggered: {
+            customEmit(Math.random() * parent.width,
+                       Math.random() * parent.width) // height is 0 somehow
+        }
+    }
+
+    ParticleSystem {
+        id: fireworksSystem
+        running: fireworksInternalTimer.running
+        onRunningChanged: {
+            if (running) {
+                opacity = 1
+            } else {
+                opacity = 0
+            }
+        }
+
+        Behavior on opacity {
+            SequentialAnimation {
+                NumberAnimation { duration: Kirigami.Units.longDuration }
+            }
+        }
+    }
+
+    ImageParticle {
+        id: fireworksParticleA
+        system: fireworksSystem
+        source: "qrc:///particleresources/glowdot.png"
+        alphaVariation: 0.1
+        alpha: 0.1
+        groups: ["a"]
+        opacity: fireworksSystem.opacity
+    }
+
+    ImageParticle {
+        system: fireworksSystem
+        source: "qrc:///particleresources/glowdot.png"
+        color: "white"
+        alphaVariation: 0.1
+        alpha: 0.1
+        groups: ["white"]
+        opacity: fireworksSystem.opacity
+    }
+
+    ImageParticle {
+        id: fireworksParticleB
+        system: fireworksSystem
+        source: "qrc:///particleresources/glowdot.png"
+        alphaVariation: 0.1
+        alpha: 0.1
+        groups: ["b"]
+        opacity: fireworksSystem.opacity
+    }
+
+    Component {
+        id: emitterComp
+        Emitter {
+            id: container
+            property int life: 2600
+            property real targetX: 0
+            property real targetY: 0
+            width: 1
+            height: 1
+            system: fireworksSystem
+            emitRate: 100
+            size: 16
+            endSize: 8
+            sizeVariation: 5
+            Timer {
+                interval: life
+                running: true
+                onTriggered: {
+                    container.destroy();
+                    var randomHue = Math.random()
+                    fireworksParticleA.color = Qt.hsla(randomHue, 0.8, 0.5, 1)
+                    fireworksParticleA.color = Qt.hsla(1-randomHue, 0.8, 0.5, 1)
+                }
+            }
+            velocity: AngleDirection {angleVariation:360; magnitude: 200}
+        }
+    }
+
+    function customEmit(x,y) {
+        var currentSize = Math.round(Math.random() * 200) + 40
+        var currentLifeSpan = Math.round(Math.random() * 1000) + 100
+        for (var i=0; i<8; i++) {
+            var obj = emitterComp.createObject(root);
+            obj.x = x
+            obj.y = y
+            obj.targetX = Math.random() * currentSize - currentSize/2 + obj.x
+            obj.targetY = Math.random() * currentSize - currentSize/2 + obj.y
+            obj.life = Math.round(Math.random() * 2400) + 200
+            obj.emitRate = Math.round(Math.random() * 32) + 32
+            obj.lifeSpan = currentLifeSpan
+            const group = Math.round(Math.random() * 3);
+            switch (group) {
+                case 0:
+                    obj.group = "white";
+                    break;
+                case 1:
+                    obj.group = "a";
+                    break;
+                case 2:
+                    obj.group = "b";
+                    break;
+            }
+        }
+    }
 }