Libgdx拖放，如何同步光标和精灵/演员？

Question

Gdx 版本：1.9.8

您好，我正在创建 JRPG，并且我有一个带有拖放系统的库存，问题是，当我单击项目时，它的位置在远离光标的左上角（参见屏幕截图），如何制作精灵在光标的中心（通常应该是这样）？？？

SCREENSHOT!!!How it looks like

import com.badlogic.gdx.scenes.scene2d.utils.DragAndDrop.Target;
import com.badlogic.gdx.scenes.scene2d.utils.DragAndDrop.Source;
import com.badlogic.gdx.scenes.scene2d.utils.DragAndDrop.Payload;
import com.redsoft.redrune.InventoryItem;

public class InventorySlotTarget extends Target {

    InventorySlot _targetSlot;

    public InventorySlotTarget(InventorySlot actor) {
        super(actor);
        _targetSlot = actor;
    }

    @Override
    public boolean drag(Source source, Payload payload, float x, float y, int pointer) {
        return true;
    }

    @Override
    public void reset(Source source, Payload payload) {
    }

    @Override
    public void drop(Source source, Payload payload, float x, float y, int pointer) {

        InventoryItem sourceActor = (InventoryItem) payload.getDragActor();
        InventoryItem targetActor = _targetSlot.getTopInventoryItem();
        InventorySlot sourceSlot = ((InventorySlotSource) source).getSourceSlot();

        if (sourceActor == null) {
            return;
        }

        //First, does the slot accept the source item type?
        if (!_targetSlot.doesAcceptItemUseType(sourceActor.getItemUseType())) {
            //Put item back where it came from, slot doesn't accept item
            sourceSlot.add(sourceActor);
            return;
        }

        if (!_targetSlot.hasItem()) {
            _targetSlot.add(sourceActor);
        } else {
            //If the same item and stackable, add
            if (sourceActor.isSameItemType(targetActor) && sourceActor.isStackable()) {
                _targetSlot.add(sourceActor);
            } else {
                //If they aren't the same items or the items aren't stackable, then swap
                InventorySlot.swapSlots(sourceSlot, _targetSlot, sourceActor);
            }
        }

    }
}

更新！

import com.badlogic.gdx.scenes.scene2d.Actor;
import com.badlogic.gdx.scenes.scene2d.InputEvent;
import com.badlogic.gdx.scenes.scene2d.utils.DragAndDrop;
import com.badlogic.gdx.scenes.scene2d.utils.DragAndDrop.Source;
import com.badlogic.gdx.scenes.scene2d.utils.DragAndDrop.Payload;
import com.badlogic.gdx.scenes.scene2d.utils.DragAndDrop.Target;

public class InventorySlotSource extends Source {

    private DragAndDrop _dragAndDrop;
    private InventorySlot _sourceSlot;

    public InventorySlotSource(InventorySlot sourceSlot, DragAndDrop dragAndDrop) {
        super(sourceSlot.getTopInventoryItem());
        this._sourceSlot = sourceSlot;
        this._dragAndDrop = dragAndDrop;
    }

    @Override
    public Payload dragStart(InputEvent event, float x, float y, int pointer) {
        Payload payload = new Payload();
        Actor actor = getActor();
        if (actor == null) {
            return null;
        }

        InventorySlot source = (InventorySlot) actor.getParent();
        if (source == null) {
            return null;
        } else {
            _sourceSlot = source;
        }

        _sourceSlot.decrementItemCount(true);

        payload.setDragActor(getActor());
        _dragAndDrop.setDragActorPosition(-x, -y + getActor().getHeight());

        return payload;
    }

    @Override
    public void dragStop(InputEvent event, float x, float y, int pointer, Payload payload, Target target) {
        if (target == null) {
            _sourceSlot.add(payload.getDragActor());
        }
    }

    public InventorySlot getSourceSlot() {
        return _sourceSlot;
    }
}

Answer 1

这是在 DragAndDrop 对象中设置的。默认位置假定您希望演员的右下角与光标对齐。你可以这样居中：

dragAndDrop.setDragActorPosition(dragActor.getWidth() / 2, -dragActor.getHeight() / 2);

您只需在设置拖动 actor 后调用一次。我认为方法名称具有误导性（应该说偏移而不是位置）。