LibGDX：如何使平铺地图图块可点击？ [英] LibGDX: How to make tiled map tiles clickable?

问题描述

如何为平铺地图中的切片添加点击侦听器，以便在使用鼠标选择切片时它会突出显示？

How can I add click listeners for the tiles from tiled map so that when you select a tile with the mouse it becomes highlighted?

推荐答案

libGDX不直接支持，因为TiledMap的东西只用于渲染。

That's not supported directly by libGDX as the TiledMap stuff is only for rendering.

你可以轻松创建一个 Stage ，它将作为TiledMap的某种覆盖输入层。只需为每个图块创建一个 Actor ，该图块与该图块的位置大小相同。然后，您可以将 EventListener 添加到这些演员，以便能够识别这些演员的点击等内容。

You could easily create a Stage though, which will act as some kind of overlay-input-layer for your TiledMap. Just create an Actor for each tile which has the same size as position as that tile. Then you are able to add EventListeners to those actors to be able to recognize things like clicks on those actors.

那些演员应该保留对其起源的引用，即 TiledMapTileLayer.Cell 。因此，您可以在处理这些事件时随时从演员返回到单元格。

Those actors should keep a reference to their "origin", namely TiledMapTileLayer.Cell. So you are able to go back from the actor to the cell anytime when processing those events.

以下显示了如何执行此操作：

The following shows how you might do it:

此演员负责捕捉事件并保留有关其基于的图块的信息：

This Actor is responsible to catch the events and keep the information about the tile it's based on:

public class TiledMapActor extends Actor {

    private TiledMap tiledMap;

    private TiledMapTileLayer tiledLayer;

    private TiledMapTileLayer.Cell cell;

    public TiledMapActor(TiledMap tiledMap, TiledMapTileLayer tiledLayer, TiledMapTileLayer.Cell cell) {
        this.tiledMap = tiledMap;
        this.tiledLayer = tiledLayer;
        this.cell = cell;
    }

}

这个小听众可以附加到其中一个演员并将做任何逻辑：

This little listener can be attached to one of those actors and will do any kind of logic:

public class TiledMapClickListener extends ClickListener {

    private TiledMapActor actor;

    public TiledMapClickListener(TiledMapActor actor) {
        this.actor = actor;
    }

    @Override
    public void clicked(InputEvent event, float x, float y) {
        System.out.println(actor.cell + " has been clicked.");
    }
}

以下课程实际上是从给定地图创建演员并将它们连接到监听器：

The following class actually creates the actors from a given map and wires them to the listeners:

public class TiledMapStage extends Stage {

    private TiledMap tiledMap;

    public TiledMapStage(TiledMap tiledMap) {
        this.tiledMap = tiledMap;

        for (MapLayer layer : tiledMap.getLayers()) {
            TiledMapTileLayer tiledLayer = (TiledMapTileLayer)layer;
            createActorsForLayer(tiledLayer);
        }
    }

    private void createActorsForLayer(TiledMapTileLayer tiledLayer) {
        for (int x = 0; x < tiledLayer.getWidth(); x++) {
            for (int y = 0; y < tiledLayer.getHeight(); y++) {
                TiledMapTileLayer.Cell cell = tiledLayer.getCell(x, y);
                TiledMapActor actor = new TiledMapActor(tiledMap, tiledLayer, cell);
                actor.setBounds(x * tiledLayer.getTileWidth(), y * tiledLayer.getTileHeight(), tiledLayer.getTileWidth(),
                        tiledLayer.getTileHeight());
                addActor(actor);
                EventListener eventListener = new TiledMapClickListener(actor);
                actor.addListener(eventListener);
            }
        }
    }
}

现在 TiledMapStage 将为您完成所有工作。您需要做的就是：

Now the TiledMapStage will do all work for you. All you need to do is the following:

Stage stage = new TiledMapStage(tiledMap);
Gdx.input.setInputProcessor(stage);

在渲染（...）中你需要调用 stage.act （）。请记住，当您用于渲染TiledMap时，为舞台使用相同的视口。否则输入和渲染的地图将不会对齐。

And in render(...) you need to call stage.act(). Remember to use the same Viewport for the stage as you are using to render the TiledMap. Otherwise the input and your rendered map won't be aligned.

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