Added terrain square ID selection (only local index currently)

core/src/se/cookery/CookeryClient.java

@@ -37,7 +37,7 @@ public class CookeryClient extends SimpleApplication {
         BlockGenerator blockGenerator = new GrassLandBlockGenerator();
         World world = new World(blockGenerator);
 
-        TerrainManager terrain = new TerrainManager(1, 1,
+        TerrainManager terrain = new TerrainManager(1, 5,
                 new BlockHeightMap(world),
                 MaterialUtil.createMaterial(assetManager, ColorRGBA.Green));
 

core/src/se/cookery/gfx/input/MouseClickAction.java

@@ -50,12 +50,18 @@ public class MouseClickAction implements ActionListener {
             rootNode.collideWith(ray, results);
 
             if (results.size() > 0) {
-                // The closest result is the target that the player picked:
+                // The closest result is the target that the player picked
-                Geometry target = results.getClosestCollision().getGeometry();
+                CollisionResult collision = results.getClosestCollision();
-                System.out.println("Click registered: Geometry: " + target.getName());
+                System.out.println("Click registered: Geometry: " + collision.getGeometry().getName());
 
-                if (target.getMesh() instanceof TerrainMesh) {
+                if (collision.getGeometry().getMesh() instanceof TerrainMesh) {
-                    System.out.println("Terrain");
+                    TerrainMesh terrainMesh = (TerrainMesh) collision.getGeometry().getMesh();
+                    Vector3f vect = collision.getContactPoint().subtract(collision.getGeometry().getLocalTranslation());
+                    System.out.println("Terrain: "
+                            + terrainMesh.getSquareIndexX(vect)
+                            + "x"
+                            + terrainMesh.getSquareIndexZ(vect)
+                    );
                 }
             }
         }

core/src/se/cookery/gfx/terrain/TerrainManager.java

@@ -22,8 +22,8 @@ public class TerrainManager {
     /**
      * Create a new instance of TerrainManager
      *
-     * @param squareLength  is the width of a single square
+     * @param squareLength  is the size of a single square
-     * @param squareCount   is the height of a single square
+     * @param squareCount   is the number of squares on each side in each block
      * @param heightMap     is the height map for the terrain
      */
     public TerrainManager(float squareLength, int squareCount, TerrainHeightMap heightMap, Material material) {
@@ -34,7 +34,7 @@ public class TerrainManager {
 
         for (int x=0; x<BUFFER_SIZE; x++) {
             for (int z=0; z<BUFFER_SIZE; z++) {
-                TerrainMesh terrainMesh = new TerrainMesh(squareLength, squareLength,  squareCount, squareCount);
+                TerrainMesh terrainMesh = new TerrainMesh(squareLength, squareCount);
                 terrainBuffer[x][z] = new Geometry("TerrainMesh " + x + "x" + z, terrainMesh);
                 terrainBuffer[x][z].setMaterial(material);
                 terrainBuffer[x][z].setLocalTranslation(terrainMesh.getMeshLengthX() * x, 0, terrainMesh.getMeshLengthZ() * z);
@@ -71,7 +71,7 @@ public class TerrainManager {
     }
 
     /**
-     * @return a vector to the closest terrain mesh coordinate.
+     * @return a vector to the closest terrain mesh coordinate from the given coordinate.
      */
     private Vector3f getTerrainVector(Vector3f position) {
         return new Vector3f(

core/src/se/cookery/gfx/terrain/TerrainMesh.java

@@ -1,5 +1,6 @@
 package se.cookery.gfx.terrain;
 
+import com.jme3.math.Vector3f;
 import com.jme3.scene.Mesh;
 import com.jme3.scene.VertexBuffer;
 
@@ -15,6 +16,16 @@ public class TerrainMesh extends Mesh {
     private int squareCountZ;
 
 
+    /**
+     * Created a symmetrically sized terrain Mesh.
+     *
+     * @param squareLength      is the width and height of a single square
+     * @param squareCount       the number of squares that make up the whole terrain on the X and Z axis
+     */
+    public TerrainMesh(float squareLength, int squareCount){
+        this(squareLength, squareLength, squareCount, squareCount);
+    }
+
     /**
      * Created a terrain Mesh with the given sizes.
      *
@@ -125,11 +136,18 @@ public class TerrainMesh extends Mesh {
         return squareLengthZ * squareCountZ;
     }
 
-    public float getSquareLengthX() {
+
-        return squareLengthX;
+    public int getSquareIndexX(Vector3f pos) {
+        if (pos.x < 0 || pos.x > squareLengthX * squareCountX)
+            return -1;
+
+        return (int)(pos.x / squareLengthX);
     }
 
-    public float getSquareLengthZ() {
+    public int getSquareIndexZ(Vector3f pos) {
-        return squareLengthZ;
+        if (pos.z < 0 || pos.z > squareLengthZ * squareCountZ)
+            return -1;
+
+        return (int)(pos.z / squareLengthZ);
     }
 }

core/test/se/cookery/gfx/terrain/TerrainMeshTest.java

@@ -1,5 +1,6 @@
 package se.cookery.gfx.terrain;
 
+import com.jme3.math.Vector3f;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -8,7 +9,7 @@ class TerrainMeshTest {
 
     @Test
     public void singleSquareTerrain(){
-        TerrainMesh terrain = new TerrainMesh(1, 1, 1 ,1);
+        TerrainMesh terrain = new TerrainMesh(1, 1);
 
         float[] vertexBuffer = terrain.generateVertexBuffer();
         assertEquals(3 * 4, vertexBuffer.length);
@@ -29,7 +30,7 @@ class TerrainMeshTest {
 
     @Test
     public void fourSquareTerrain(){
-        TerrainMesh terrain = new TerrainMesh(1, 1, 2 ,2);
+        TerrainMesh terrain = new TerrainMesh(1, 2);
 
         float[] vertexBuffer = terrain.generateVertexBuffer();
         assertEquals(3 * 9, vertexBuffer.length);
@@ -58,4 +59,26 @@ class TerrainMeshTest {
                 5, 7, 8,
         }, indexBuffer);
     }
+
+    @Test
+    void getSquareIndexX() {
+        TerrainMesh terrain = new TerrainMesh(1, 10);
+
+        assertEquals(terrain.getSquareIndexX(new Vector3f(-5.4f, 0f, 0f)), -1);
+        assertEquals(terrain.getSquareIndexX(new Vector3f(20.3f, 0f, 0f)), -1);
+        assertEquals(terrain.getSquareIndexX(new Vector3f(0f, 0f, 0f)), 0);
+        assertEquals(terrain.getSquareIndexX(new Vector3f(2.5f, 0f, 0f)), 2);
+        assertEquals(terrain.getSquareIndexX(new Vector3f(9.9f, 0f, 0f)), 9);
+    }
+
+    @Test
+    void getSquareIndexZ() {
+        TerrainMesh terrain = new TerrainMesh(1, 10);
+
+        assertEquals(terrain.getSquareIndexZ(new Vector3f(0f, 0f, -5.4f)), -1);
+        assertEquals(terrain.getSquareIndexZ(new Vector3f(0f, 0f, 20.3f)), -1);
+        assertEquals(terrain.getSquareIndexZ(new Vector3f(0f, 0f, 0f)), 0);
+        assertEquals(terrain.getSquareIndexZ(new Vector3f(0f, 0f, 2.5f)), 2);
+        assertEquals(terrain.getSquareIndexZ(new Vector3f(0f, 0f, 9.9f)), 9);
+    }
 }