From 61025972eb983c1cfae8a2bb5d9d938c26743a98 Mon Sep 17 00:00:00 2001
From: Anuken <arnukren@gmail.com>
Date: Sat, 8 Jan 2022 23:42:20 -0500
Subject: [PATCH] Plant launch lerp animation

---
 .../mindustry/graphics/g3d/PlanetParams.java    |  4 ++++
 .../mindustry/graphics/g3d/PlanetRenderer.java  |  7 ++++++-
 core/src/mindustry/type/Planet.java             |  3 ++-
 core/src/mindustry/ui/dialogs/PlanetDialog.java | 17 +++++++++++++++++
 4 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/core/src/mindustry/graphics/g3d/PlanetParams.java b/core/src/mindustry/graphics/g3d/PlanetParams.java
index 9116592fae..ee31f7d172 100644
--- a/core/src/mindustry/graphics/g3d/PlanetParams.java
+++ b/core/src/mindustry/graphics/g3d/PlanetParams.java
@@ -10,6 +10,10 @@ import mindustry.type.*;
 public class PlanetParams{
     /** Camera direction relative to the planet. Length is determined by zoom. */
     public Vec3 camPos = new Vec3(0f, 0f, 4f);
+    /** If not null, this is the position of the "previous" planet for smooth camera movement. */
+    public @Nullable Vec3 otherCamPos;
+    /** Interpolation value for otherCamPos. */
+    public float otherCamAlpha = 0f;
     /** Camera up vector. */
     public Vec3 camUp = new Vec3(0f, 1f, 0f);
     /** the unit length direction vector of the camera **/
diff --git a/core/src/mindustry/graphics/g3d/PlanetRenderer.java b/core/src/mindustry/graphics/g3d/PlanetRenderer.java
index dbdac3100b..f42e6ec7c8 100644
--- a/core/src/mindustry/graphics/g3d/PlanetRenderer.java
+++ b/core/src/mindustry/graphics/g3d/PlanetRenderer.java
@@ -69,7 +69,12 @@ public class PlanetRenderer implements Disposable{
 
         cam.resize(w, h);
         params.camPos.setLength((params.planet.radius + params.planet.camRadius) * camLength + (params.zoom-1f) * (params.planet.radius + params.planet.camRadius) * 2);
-        cam.position.set(params.planet.position).add(params.camPos);
+
+        if(params.otherCamPos != null){
+            cam.position.set(params.otherCamPos).lerp(params.planet.position, params.otherCamAlpha).add(params.camPos);
+        }else{
+            cam.position.set(params.planet.position).add(params.camPos);
+        }
         //cam.up.set(params.camUp); //TODO broken
         cam.lookAt(params.planet.position);
         cam.update();
diff --git a/core/src/mindustry/type/Planet.java b/core/src/mindustry/type/Planet.java
index 064deb1077..3892cd0b6d 100644
--- a/core/src/mindustry/type/Planet.java
+++ b/core/src/mindustry/type/Planet.java
@@ -276,7 +276,8 @@ public class Planet extends UnlockableContent{
             }
         }
 
-        launchCandidates = candidates;
+        //TODO currently, mutual launch candidates are simply a nuisance.
+        //launchCandidates = candidates;
 
         clipRadius = Math.max(clipRadius, radius + atmosphereRadOut + 0.5f);
     }
diff --git a/core/src/mindustry/ui/dialogs/PlanetDialog.java b/core/src/mindustry/ui/dialogs/PlanetDialog.java
index e57fb31e75..e2db4e670c 100644
--- a/core/src/mindustry/ui/dialogs/PlanetDialog.java
+++ b/core/src/mindustry/ui/dialogs/PlanetDialog.java
@@ -172,6 +172,7 @@ public class PlanetDialog extends BaseDialog implements PlanetInterfaceRenderer{
 
         rebuildButtons();
         mode = look;
+        state.otherCamPos = null;
         selected = hovered = launchSector = null;
         launching = false;
 
@@ -259,6 +260,8 @@ public class PlanetDialog extends BaseDialog implements PlanetInterfaceRenderer{
         //automatically select next planets; TODO pan!
         if(sector.planet.launchCandidates.size == 1){
             state.planet = sector.planet.launchCandidates.first();
+            state.otherCamPos = sector.planet.position;
+            state.otherCamAlpha = 0f;
         }
 
         //TODO pan over to correct planet
@@ -284,6 +287,7 @@ public class PlanetDialog extends BaseDialog implements PlanetInterfaceRenderer{
         zoom = 1f;
         state.zoom = 1f;
         state.uiAlpha = 0f;
+        state.otherCamPos = null;
         launchSector = sector;
 
         mode = select;
@@ -669,6 +673,19 @@ public class PlanetDialog extends BaseDialog implements PlanetInterfaceRenderer{
     public void act(float delta){
         super.act(delta);
 
+        //update lerp
+        if(state.otherCamPos != null){
+            state.otherCamAlpha = Mathf.lerpDelta(state.otherCamAlpha, 1f, 0.05f);
+            state.camPos.set(0f, camLength, 0.1f);
+
+            if(Mathf.equal(state.otherCamAlpha, 1f, 0.01f)){
+                //cam.position.set(params.otherCamPos).lerp(params.planet.position, params.otherCamAlpha).add(params.camPos);
+                state.camPos.set(Tmp.v31.set(state.otherCamPos).lerp(state.planet.position, state.otherCamAlpha).add(state.camPos).sub(state.planet.position));
+
+                state.otherCamPos = null;
+            }
+        }
+
         if(hovered != null && !mobile && state.planet.hasGrid()){
             addChild(hoverLabel);
             hoverLabel.toFront();