libgdx Action 动作动画

最新推荐文章于 2020-07-28 14:33:59 发布

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最新推荐文章于 2020-07-28 14:33:59 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/hanhongmin/p/3895440.html

本文介绍Libgdx中动作系统的使用方法，包括移动、旋转、缩放等基本动作及复合动作的应用。通过示例代码展示了如何实现这些动作，并解释了关键步骤。

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Libgdx中有个类Actions, 从它开始顺藤摸瓜就能把哪些简单的Action快速掌握

见代码：

 1 public class ActionTestScreen implements Screen,InputProcessor{
 2     private Stage stage;
 3     private Texture texture;
 4     private Image img;
 5 
 6     @Override
 7     public void render(float delta) {
 8         Gdx.gl.glClearColor(1, 0, 0, 1);
 9         Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
10         stage.act();
11         stage.draw();
12     }
13 
14     @Override
15     public void show() {
16         Gdx.input.setInputProcessor(this);//容易遗忘
17         stage = new Stage();
18         texture = new Texture("badlogic.jpg");
19         img = new Image(texture);
20         //img.setCenterPosition(img.getWidth()/2,img.getHeight()/2);//重要
21         img.setOrigin(img.getCenterX(),img.getCenterY());//重要！
22         stage.addActor(img);
23         System.out.println(img.getX()+","+img.getY());
24     }
25 
26     @Override
27     public boolean keyDown(int keycode) {
28         switch (keycode){
29             case Input.Keys.NUM_1:{
30                 MoveByAction moveBy = Actions.moveBy(100,100,0.5f);
31                 img.addAction(moveBy);
32                 return true;
33             }
34             case Input.Keys.NUM_2:{
35                 MoveToAction moveTo = Actions.moveTo(200, 200, 0.5f);
36                 img.addAction(moveTo);
37                 return true;
38             }
39             case Input.Keys.NUM_3:{
40                 RotateByAction rotateBy = Actions.rotateBy(90,0.5f);
41                 img.addAction(rotateBy);
42                 return true;
43             }
44             case Input.Keys.NUM_4:{
45                 RotateToAction rotateTo = Actions.rotateTo(90, 0.5f);
46                 img.addAction(rotateTo);
47                 return true;
48             }
49             case Input.Keys.NUM_5:{
50                 ScaleByAction scaleBy = Actions.scaleBy(0.5f,0.5f,0.5f);
51                 img.addAction(scaleBy);
52                 return true;
53             }
54             case Input.Keys.NUM_6:{
55                 ScaleToAction scaleTo = Actions.scaleTo(0.5f,0.5f,0.5f);
56                 img.addAction(scaleTo);
57                 return true;
58             }
59             case Input.Keys.NUM_7:{//顺序执行
60                 img.setCenterPosition(0,0);
61                 img.setScale(1,1);
62 
63                 MoveToAction m2 = Actions.moveTo(200,200,0.5f);
64                 RotateByAction r1 = Actions.rotateBy(360,0.5f);
65                 ScaleToAction s1 = Actions.scaleTo(0.5f,0.5f,0.5f);
66                 SequenceAction s = Actions.sequence(m2,r1,s1);
67                 img.addAction(s);
68                 return true;
69             }
70             case Input.Keys.NUM_8:{//同时执行
71                 img.setCenterPosition(0,0);
72                 img.setScale(1,1);
73 
74                 MoveToAction m2 = Actions.moveTo(200,200,0.5f);
75                 RotateByAction r1 = Actions.rotateBy(360,0.5f);
76                 ScaleToAction s1 = Actions.scaleTo(0.5f,0.5f,0.5f);
77                 ParallelAction s = Actions.parallel(m2,r1,s1);
78                 img.addAction(s);
79                 return true;
80             }
81             case Input.Keys.A:{//同时执行
82                 AlphaAction a1 = Actions.alpha(0.5f,0.5f);
83 
84                 img.addAction(a1);
85                 return true;
86             }
87             ......
88 
89 
90         }
91         return false;
92     }
93 ......