(libgdx学习)GestureDetector

最新推荐文章于 2020-03-06 12:29:22 发布

最新推荐文章于 2020-03-06 12:29:22 发布 · 199 阅读

本文详细解析了游戏开发中手势检测组件GestureDetector的使用方法，包括其核心功能、事件监听实现及与InputProcessor的交互机制，并通过实例展示了如何在游戏逻辑中灵活运用手势事件。此外，文章还提供了相关代码示例和应用效果展示，帮助开发者深入理解并实践手势事件处理。

官方文档部分解释

1）

TheGestureListenercan signal whether it consumed the event or wants it to be passed on to the next InputProcessor by returning either true or false respectively from its methods.

As with the events reported to a normalInputProcessor, the respective methods will be called right before the call toApplicationListener.render()on the rendering thread.

TheGestureDetectoralso has a second constructor that allows it to specify various parameters for gesture detection. Please refer to theJavadocsfor more information.

GestureDetector同样适用于inputprocessor对事件处理的的链式传递规则,因为GestureDetector实现了inputprocessor接口

二、应用举例

MyGestureDetector

package com.example.groupactiontest;

import com.badlogic.gdx.input.GestureDetector.GestureListener;
import com.badlogic.gdx.math.Vector2;

public class MyGestureListener implements GestureListener {

	@Override
	public boolean fling(float arg0, float arg1, int arg2) {//fling和pan差不多
		System.out.println("------->fling");
		
		return false;
	}

	@Override
	public boolean longPress(float arg0, float arg1) {//长按
		System.out.println("------->longPress");
		return false;
	}

	@Override
	public boolean pan(float arg0, float arg1, float arg2, float arg3) {
		System.out.println("------->pan");
		return false;
	}

	@Override
	public boolean pinch(Vector2 arg0, Vector2 arg1, Vector2 arg2, Vector2 arg3) {//pinch和zoom差不多
		System.out.println("------->pinch");
		return false;
	}

	@Override
	public boolean tap(float arg0, float arg1, int arg2, int arg3) {//tap和touchdown差不多
		System.out.println("------->tap");
		return false;
	}

	@Override
	public boolean touchDown(float arg0, float arg1, int arg2, int arg3) {
		System.out.println("gesturedetector------->touchDown");
		return true;
	}

	@Override
	public boolean zoom(float arg0, float arg1) {
		System.out.println("------->zoom");
		return false;
	}

}

MyGame

package com.example.groupactiontest;

import com.badlogic.gdx.ApplicationListener;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.Input.Keys;
import com.badlogic.gdx.Input.Peripheral;
import com.badlogic.gdx.InputMultiplexer;
import com.badlogic.gdx.InputProcessor;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.input.GestureDetector;

public class MyGame implements ApplicationListener {

	
	InputProcessor inputProcessor;
	
	@Override
	public void create() {
		inputProcessor = new InputProcessor() {
			
			@Override
			public boolean touchUp(int screenX, int screenY, int pointer, int button) {
				// TODO Auto-generated method stub
				return false;
			}
			
			@Override
			public boolean touchDragged(int screenX, int screenY, int pointer) {
				// TODO Auto-generated method stub
				return false;
			}
			
			@Override
			public boolean touchDown(int screenX, int screenY, int pointer, int button) {
				System.out.println("inputprocessor:--->towndown" );
				return false;
			}
			
			@Override
			public boolean scrolled(int amount) {
				// TODO Auto-generated method stub
				return false;
			}
			
			@Override
			public boolean mouseMoved(int screenX, int screenY) {
				// TODO Auto-generated method stub
				return false;
			}
			
			@Override
			public boolean keyUp(int keycode) {
				// TODO Auto-generated method stub
				return false;
			}
			
			@Override
			public boolean keyTyped(char character) {
				// TODO Auto-generated method stub
				return false;
			}
			
			@Override
			public boolean keyDown(int keycode) {
				// TODO Auto-generated method stub
				return false;
			}
		};
		
		//GestureDetector同样适用于inputprocessor的链式传递规则(因为GestureDetector就是实现了inputprocessor接口的)
		InputMultiplexer inputMultiplexer = new InputMultiplexer();
		inputMultiplexer.addProcessor(new GestureDetector(new MyGestureListener()));
		inputMultiplexer.addProcessor(inputProcessor);
		
		Gdx.input.setInputProcessor(inputMultiplexer);
	}

	@Override
	public void dispose() {
		// TODO Auto-generated method stub

	}

	@Override
	public void pause() {
		// TODO Auto-generated method stub

	}

	@Override
	public void render() {
		Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
		
		
	}

	@Override
	public void resize(int arg0, int arg1) {
		// TODO Auto-generated method stub

	}

	@Override
	public void resume() {
		// TODO Auto-generated method stub

	}

}

三、效果图

若GestureDetector中的touchDown的返回值为false，则logcat中的输出结果是