refactor: DistanceProxy

fxgl-entity/src/main/java/com/almasb/fxgl/physics/box2d/collision/Distance.java

@@ -430,104 +430,6 @@ public void solve3() {
         }
     }
 
-    /**
-     * A distance proxy is used by the GJK algorithm. It encapsulates any shape. jbox2dTODO: see if we can
-     * just do assignments with m_vertices, instead of copying stuff over
-     *
-     * @author daniel
-     */
-    public static class DistanceProxy {
-        public final Vec2[] m_vertices = new Vec2[JBoxSettings.maxPolygonVertices];
-        public int m_count = 0;
-        public float m_radius = 0f;
-        public final Vec2[] m_buffer = new Vec2[2];
-
-        public DistanceProxy() {
-            for (int i = 0; i < m_vertices.length; i++) {
-                m_vertices[i] = new Vec2();
-            }
-        }
-
-        /**
-         * Initialize the proxy using the given shape. The shape must remain in scope while the proxy is
-         * in use.
-         */
-        public final void set(final Shape shape, int index) {
-            switch (shape.getType()) {
-                case CIRCLE:
-                    final CircleShape circle = (CircleShape) shape;
-                    m_vertices[0].set(circle.center);
-                    m_count = 1;
-                    m_radius = circle.getRadius();
-
-                    break;
-                case POLYGON:
-                    final PolygonShape poly = (PolygonShape) shape;
-                    m_count = poly.getVertexCount();
-                    m_radius = poly.getRadius();
-                    for (int i = 0; i < m_count; i++) {
-                        m_vertices[i].set(poly.m_vertices[i]);
-                    }
-                    break;
-                case CHAIN:
-                    final ChainShape chain = (ChainShape) shape;
-                    assert 0 <= index && index < chain.getCount();
-
-                    m_buffer[0] = chain.getVertex(index);
-                    if (index + 1 < chain.getCount()) {
-                        m_buffer[1] = chain.getVertex(index + 1);
-                    } else {
-                        m_buffer[1] = chain.getVertex(0);
-                    }
-
-                    m_vertices[0].set(m_buffer[0]);
-                    m_vertices[1].set(m_buffer[1]);
-                    m_count = 2;
-                    m_radius = chain.getRadius();
-                    break;
-                case EDGE:
-                    EdgeShape edge = (EdgeShape) shape;
-                    m_vertices[0].set(edge.m_vertex1);
-                    m_vertices[1].set(edge.m_vertex2);
-                    m_count = 2;
-                    m_radius = edge.getRadius();
-                    break;
-                default:
-                    assert false;
-            }
-        }
-
-        /**
-         * Get the supporting vertex index in the given direction.
-         *
-         * @param d
-         * @return
-         */
-        public final int getSupport(final Vec2 d) {
-            int bestIndex = 0;
-            float bestValue = Vec2.dot(m_vertices[0], d);
-            for (int i = 1; i < m_count; i++) {
-                float value = Vec2.dot(m_vertices[i], d);
-                if (value > bestValue) {
-                    bestIndex = i;
-                    bestValue = value;
-                }
-            }
-
-            return bestIndex;
-        }
-
-        /**
-         * Used by Distance.
-         *
-         * @return a vertex by index
-         */
-        public final Vec2 getVertex(int index) {
-            assert 0 <= index && index < m_count;
-            return m_vertices[index];
-        }
-    }
-
     private Simplex simplex = new Simplex();
     private int[] saveA = new int[3];
     private int[] saveB = new int[3];

fxgl-entity/src/main/java/com/almasb/fxgl/physics/box2d/collision/DistanceProxy.java

@@ -0,0 +1,109 @@
+/*
+ * FXGL - JavaFX Game Library. The MIT License (MIT).
+ * Copyright (c) AlmasB ([email protected]).
+ * See LICENSE for details.
+ */
+
+package com.almasb.fxgl.physics.box2d.collision;
+
+import com.almasb.fxgl.core.math.Vec2;
+import com.almasb.fxgl.physics.box2d.collision.shapes.*;
+import com.almasb.fxgl.physics.box2d.common.JBoxSettings;
+
+/**
+ * A distance proxy is used by the GJK algorithm. It encapsulates any shape. jbox2dTODO: see if we can
+ * just do assignments with m_vertices, instead of copying stuff over
+ *
+ * @author daniel
+ */
+public class DistanceProxy {
+    public final Vec2[] m_vertices = new Vec2[JBoxSettings.maxPolygonVertices];
+    public int m_count = 0;
+    public float m_radius = 0f;
+    public final Vec2[] m_buffer = new Vec2[2];
+
+    public DistanceProxy() {
+        for (int i = 0; i < m_vertices.length; i++) {
+            m_vertices[i] = new Vec2();
+        }
+    }
+
+    /**
+     * Initialize the proxy using the given shape. The shape must remain in scope while the proxy is
+     * in use.
+     */
+    public final void set(final Shape shape, int index) {
+        switch (shape.getType()) {
+            case CIRCLE:
+                final CircleShape circle = (CircleShape) shape;
+                m_vertices[0].set(circle.center);
+                m_count = 1;
+                m_radius = circle.getRadius();
+
+                break;
+            case POLYGON:
+                final PolygonShape poly = (PolygonShape) shape;
+                m_count = poly.getVertexCount();
+                m_radius = poly.getRadius();
+                for (int i = 0; i < m_count; i++) {
+                    m_vertices[i].set(poly.m_vertices[i]);
+                }
+                break;
+            case CHAIN:
+                final ChainShape chain = (ChainShape) shape;
+                assert 0 <= index && index < chain.getCount();
+
+                m_buffer[0] = chain.getVertex(index);
+                if (index + 1 < chain.getCount()) {
+                    m_buffer[1] = chain.getVertex(index + 1);
+                } else {
+                    m_buffer[1] = chain.getVertex(0);
+                }
+
+                m_vertices[0].set(m_buffer[0]);
+                m_vertices[1].set(m_buffer[1]);
+                m_count = 2;
+                m_radius = chain.getRadius();
+                break;
+            case EDGE:
+                EdgeShape edge = (EdgeShape) shape;
+                m_vertices[0].set(edge.m_vertex1);
+                m_vertices[1].set(edge.m_vertex2);
+                m_count = 2;
+                m_radius = edge.getRadius();
+                break;
+            default:
+                assert false;
+        }
+    }
+
+    /**
+     * Get the supporting vertex index in the given direction.
+     *
+     * @param d
+     * @return
+     */
+    public final int getSupport(final Vec2 d) {
+        int bestIndex = 0;
+        float bestValue = Vec2.dot(m_vertices[0], d);
+        for (int i = 1; i < m_count; i++) {
+            float value = Vec2.dot(m_vertices[i], d);
+            if (value > bestValue) {
+                bestIndex = i;
+                bestValue = value;
+            }
+        }
+
+        return bestIndex;
+    }
+
+    /**
+     * Used by Distance.
+     *
+     * @return a vertex by index
+     */
+    public final Vec2 getVertex(int index) {
+        assert 0 <= index && index < m_count;
+        return m_vertices[index];
+    }
+}

fxgl-entity/src/main/java/com/almasb/fxgl/physics/box2d/collision/SeparationFunction.java

@@ -7,7 +7,6 @@
 package com.almasb.fxgl.physics.box2d.collision;
 
 import com.almasb.fxgl.core.math.Vec2;
-import com.almasb.fxgl.physics.box2d.collision.Distance.DistanceProxy;
 import com.almasb.fxgl.physics.box2d.collision.Distance.SimplexCache;
 import com.almasb.fxgl.physics.box2d.common.Rotation;
 import com.almasb.fxgl.physics.box2d.common.Sweep;

fxgl-entity/src/main/java/com/almasb/fxgl/physics/box2d/collision/TimeOfImpact.java

@@ -6,7 +6,6 @@
 package com.almasb.fxgl.physics.box2d.collision;
 
 import com.almasb.fxgl.core.math.FXGLMath;
-import com.almasb.fxgl.physics.box2d.collision.Distance.DistanceProxy;
 import com.almasb.fxgl.physics.box2d.collision.Distance.SimplexCache;
 import com.almasb.fxgl.physics.box2d.common.JBoxSettings;
 import com.almasb.fxgl.physics.box2d.common.Sweep;

fxgl-entity/src/main/kotlin/com/almasb/fxgl/physics/box2d/collision/DistanceData.kt

@@ -7,7 +7,6 @@
 package com.almasb.fxgl.physics.box2d.collision
 
 import com.almasb.fxgl.core.math.Vec2
-import com.almasb.fxgl.physics.box2d.collision.Distance.DistanceProxy
 import com.almasb.fxgl.physics.box2d.common.Transform
 
 /**