I’m having problems implementing drag and drop functionality over X and Y axis. Selecting object is working fine. The problem is how to set the new location after releasing left mouse button. Something is wrong when I convert cursor position (2d) to world coordiates (3d). I want to move the selected object according to XY axis keeping object’s original Z value. I’m converting cursor position using following code:
[java]
final Vector2f click2d = TestDragAndDrop.this.inputManager.getCursorPosition();
final Vector3f click3d = TestDragAndDrop.this.cam.getWorldCoordinates(
new Vector2f(click2d.x, click2d.y), 0f).clone();
TestDragAndDrop.this.selectedGeom.setLocalTranslation(click3d);
[/java]
click3d shows values < 0
Full code
[java]
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package com.jme3.physics.dyn4j.tests.miscellaneous;
import com.jme3.app.SimpleApplication;
import com.jme3.collision.CollisionResult;
import com.jme3.collision.CollisionResults;
import com.jme3.input.MouseInput;
import com.jme3.input.controls.ActionListener;
import com.jme3.input.controls.MouseButtonTrigger;
import com.jme3.material.Material;
import com.jme3.math.ColorRGBA;
import com.jme3.math.Ray;
import com.jme3.math.Vector2f;
import com.jme3.math.Vector3f;
import com.jme3.scene.Geometry;
import com.jme3.scene.Node;
import com.jme3.scene.shape.Box;
/**
-
Sample 8 - how to let the user pick (select) objects in the scene using the mouse or key presses. Can be used for
-
shooting, opening doors, etc.
*/
public class TestDragAndDrop extends SimpleApplication {public static void main(final String[] args) {
final TestDragAndDrop app = new TestDragAndDrop();
app.start();
}private Node shootables;
private Geometry selectedGeom;@Override
public void simpleInitApp() {
this.flyCam.setEnabled(false);
this.inputManager.setCursorVisible(true);initKeys(); this.shootables = new Node("Shootables"); this.rootNode.attachChild(this.shootables); this.shootables.attachChild(makeCube("cube", 1, 1, 1)); this.rootNode.attachChild(makeFloor());}
private void initKeys() {
this.inputManager.addMapping(“Shoot”, new MouseButtonTrigger(MouseInput.BUTTON_LEFT));
this.inputManager.addListener(this.actionListener, “Shoot”);
}private final ActionListener actionListener = new ActionListener() {
@Override public void onAction(final String name, final boolean keyPressed, final float tpf) { if (name.equals("Shoot")) { if (keyPressed) { final Vector2f click2d = TestDragAndDrop.this.inputManager.getCursorPosition(); final Vector3f click3d = TestDragAndDrop.this.cam.getWorldCoordinates( new Vector2f(click2d.x, click2d.y), 0f).clone(); final Vector3f dir = TestDragAndDrop.this.cam .getWorldCoordinates(new Vector2f(click2d.x, click2d.y), 1f).subtractLocal(click3d) .normalizeLocal(); System.out.println("click2d" + click2d); System.out.println("click3d" + click3d); System.out.println("dir" + dir); // 1. Reset results list. final CollisionResults results = new CollisionResults(); // 2. Aim the ray from cam loc to cam direction. final Ray ray = new Ray(click3d, dir); // 3. Collect intersections between Ray and Shootables in results list. TestDragAndDrop.this.shootables.collideWith(ray, results); // 5. Use the results (we mark the hit object) if (results.size() > 0) { // The closest collision point is what was truly hit: final CollisionResult closest = results.getClosestCollision(); // Let's interact - we mark the hit with a red dot. TestDragAndDrop.this.selectedGeom = closest.getGeometry(); } else { // // No hits? Then remove the red mark. TestDragAndDrop.this.selectedGeom = null; } } else { final Vector2f click2d = TestDragAndDrop.this.inputManager.getCursorPosition(); final Vector3f click3d = TestDragAndDrop.this.cam.getWorldCoordinates( new Vector2f(click2d.x, click2d.y), 0f).clone(); if (TestDragAndDrop.this.selectedGeom != null) { click3d.z = TestDragAndDrop.this.selectedGeom.getLocalTranslation().clone().z; TestDragAndDrop.this.selectedGeom.setLocalTranslation(click3d); } } } }};
protected Geometry makeCube(final String name, final float x, final float y, final float z) {
final Box box = new Box(1, 1, 1);
final Geometry cube = new Geometry(name, box);
cube.setLocalTranslation(x, y, z);
final Material mat1 = new Material(this.assetManager, “Common/MatDefs/Misc/Unshaded.j3md”);
mat1.setColor(“Color”, ColorRGBA.randomColor());
cube.setMaterial(mat1);
return cube;
}protected Geometry makeFloor() {
final Box box = new Box(15, .2f, 15);
final Geometry floor = new Geometry(“the Floor”, box);
floor.setLocalTranslation(0, -4, -5);
final Material mat1 = new Material(this.assetManager, “Common/MatDefs/Misc/Unshaded.j3md”);
mat1.setColor(“Color”, ColorRGBA.Gray);
floor.setMaterial(mat1);
return floor;
}
}
[/java]