android游戏开发框架libgdx的使用（十七）—TiledMap中角色的行动路径

转自：http://www.apkbus.com/forum.php?mod=viewthread&tid=44511&extra=page%3D1%26filter%3Dauthor%26orderby%3Ddateline%26orderby%3Ddateline

前些日子的文章介绍了tiledmap的主角出现和移动等等问题。相对于主角游戏自然还应该有敌人（？）。

与主角不同的是，这些元素的移动时程序控制的，一般有3种。

1.随主角的移动变化,靠近主角或远离主角

2.按照固定路线移动

3.不动

第一种的话完全是看你的游戏逻辑决定，和tiledmap关系不大。第二种的话我们可以避免硬编码（把移动路径写入程序代码中），而采用tiledmap实现，下面我们来看看具体过程。

还是新建一张地图，我选用的大小是50*30，块大小：32*32。

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然后绘制地图：

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我们假定敌人从地图中间的那条路走到左边的角上。路径如下：

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现在新建一个对象层，命名为wayPoints。在几个关键的地方标注上对象，命名为wayPoint1,wayPoint2…

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处理好地图后拷贝到项目中。

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现在新建一个Enemy类，继承Image。

现在来整理一下思路，首先我们要得到所有的wayPoint.而第一个wayPoint就是角色的初始化点。那么Enemy类首先需要一个Vector2列表，然后继承Image需要一个TextureRegion。

所以构造函数为

1. public Enemy(List vector2s, TextureRegion region) {
   
2. super(region);
   
3. this.vector2s = vector2s;
   
4. currentIndex = 0;
   
5. this.x = vector2s.get(currentIndex).x;
   
6. this.y = vector2s.get(currentIndex).y;
   
7. }

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初始点有了，如何移动呢？我们先来看一下坐标

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我们现在在点1位置，将要移动到点2位置。只需计算x,y,z长度，然后求出对应的moveX和moveY就可以了。

1. float x = Math.abs(v1.x - v2.x);
   
2. float y = Math.abs(v1.y - v2.y);
   
3. float z = (float) MathUtil.distanceBetweenTwoPoints(v1, v2);
   
4. float moveX = 0f;
   
5. float moveY = 0f;
   
6. moveX = (x / z) * stepLength;
   
7. moveY = (y / z) * stepLength;
   
8. if (this.x < v2.x) {
   
9. this.x += moveX;
   
10. } else {
    
11. this.x -= moveX;
    
12. }
    
13. if (this.y < v2.y) {
    
14. this.y += moveY;
    
15. } else {
    
16. this.y -= moveY;
    
17. }

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distanceBetweenTwoPoints是我自己写的方法，计算两点距离。

现在我们的Enemy类就可以很正常的移动到下一个点了。

但当它接近下一个点的时候可以发现它在不停的颤抖。这是因为我们没有处理当Enemy到达下一个点时对点序列的更新。

当它和下一个点的距离很小时我们认定它到达下一个点，更新序列以保证它继续向下一个点移动。

1. int nextIndex = currentIndex + 1 >= vector2s.size() - 1 ? vector2s
   
2. .size() - 1 : currentIndex + 1;
   
3. Vector2 v1 = vector2s.get(currentIndex);
   
4. Vector2 v2 = vector2s.get(nextIndex);
   
5. if (MathUtil.distanceBetweenTwoPoints(new Vector2(this.x, this.y), v2) < 1) {
   
6. currentIndex = currentIndex + 1 < vector2s.size() - 1 ? currentIndex + 1
   
7. : vector2s.size() - 1;
   
8. nextIndex = currentIndex + 1 >= vector2s.size() - 1 ? vector2s
   
9. .size() - 1 : currentIndex + 1;
   
10. v1 = vector2s.get(currentIndex);
    
11. v2 = vector2s.get(nextIndex);
    
12. }

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基本没有问题了，我们看一下效果：

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因为手机不好截图，所以用的java桌面项目。

Enemy用的图片是这张

 

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用TextureRegion[][] regions = TextureRegion.split(texture, 25, 33);切分，去2行3列。

完整代码：

1. package com.cnblogs.htynkn.game;
   
2. 
   
3. import java.util.ArrayList;
   
4. import java.util.List;
   
5. 
   
6. import javax.swing.text.ZoneView;
   
7. import javax.swing.text.html.MinimalHTMLWriter;
   
8. 
   
9. import com.badlogic.gdx.ApplicationListener;
   
10. import com.badlogic.gdx.Gdx;
    
11. import com.badlogic.gdx.InputMultiplexer;
    
12. import com.badlogic.gdx.InputProcessor;
    
13. import com.badlogic.gdx.files.FileHandle;
    
14. import com.badlogic.gdx.graphics.Color;
    
15. import com.badlogic.gdx.graphics.GL10;
    
16. import com.badlogic.gdx.graphics.OrthographicCamera;
    
17. import com.badlogic.gdx.graphics.Texture;
    
18. import com.badlogic.gdx.graphics.g2d.BitmapFont;
    
19. import com.badlogic.gdx.graphics.g2d.SpriteBatch;
    
20. import com.badlogic.gdx.graphics.g2d.TextureAtlas;
    
21. import com.badlogic.gdx.graphics.g2d.TextureRegion;
    
22. import com.badlogic.gdx.graphics.g2d.tiled.TileAtlas;
    
23. import com.badlogic.gdx.graphics.g2d.tiled.TileMapRenderer;
    
24. import com.badlogic.gdx.graphics.g2d.tiled.TileSet;
    
25. import com.badlogic.gdx.graphics.g2d.tiled.TiledLayer;
    
26. import com.badlogic.gdx.graphics.g2d.tiled.TiledLoader;
    
27. import com.badlogic.gdx.graphics.g2d.tiled.TiledMap;
    
28. import com.badlogic.gdx.graphics.g2d.tiled.TiledObject;
    
29. import com.badlogic.gdx.graphics.g2d.tiled.TiledObjectGroup;
    
30. import com.badlogic.gdx.graphics.glutils.ShaderProgram;
    
31. import com.badlogic.gdx.math.MathUtil;
    
32. import com.badlogic.gdx.math.Vector2;
    
33. import com.badlogic.gdx.math.Vector3;
    
34. import com.badlogic.gdx.scenes.scene2d.Actor;
    
35. import com.badlogic.gdx.scenes.scene2d.Stage;
    
36. import com.badlogic.gdx.scenes.scene2d.ui.Image;
    
37. import com.badlogic.gdx.scenes.scene2d.ui.Label;
    
38. import com.badlogic.gdx.scenes.scene2d.ui.Label.LabelStyle;
    
39. import com.cnblogs.htynkn.actors.Enemy;
    
40. 
    
41. public class MapDemo implements ApplicationListener, InputProcessor {
    
42. 
    
43. Stage stage;
    
44. float width;
    
45. float height;
    
46. private TiledMap map;
    
47. private TileAtlas atlas;
    
48. private TileMapRenderer tileMapRenderer;
    
49. Vector3 camDirection = new Vector3(1, 1, 0);
    
50. Vector2 maxCamPosition = new Vector2(0, 0);
    
51. Vector3 moveVector = new Vector3(0, 0, 0);
    
52. Enemy enemy;
    
53. int i = 0;
    
54. 
    
55. @Override
    
56. public void create() {
    
57. final String path = "map/";
    
58. final String mapname = "adancedmap";
    
59. FileHandle mapHandle = Gdx.files.internal(path + mapname + ".tmx");
    
60. map = TiledLoader.createMap(mapHandle);
    
61. 
    
62. atlas = new TileAtlas(map, new FileHandle("map/"));
    
63. tileMapRenderer = new TileMapRenderer(map, atlas, 10, 10);
    
64. maxCamPosition.set(tileMapRenderer.getMapWidthUnits(), tileMapRenderer
    
65. .getMapHeightUnits());
    
66. 
    
67. width = Gdx.graphics.getWidth();
    
68. height = Gdx.graphics.getHeight();
    
69. stage = new Stage(width, height, true);
    
70. 
    
71. List list = new ArrayList();
    
72. //获取所有wayPoints
    
73. for (TiledObjectGroup group : map.objectGroups) {
    
74. for (TiledObject object : group.objects) {
    
75. if (object.name.startsWith("wayPoint")) {
    
76. System.out.println(object.name + " X:" + object.x + " Y:"
    
77. + object.y);
    
78. list
    
79. .add(new Vector2(object.x, maxCamPosition.y
    
80. - object.y));
    
81. }
    
82. }
    
83. }
    
84. TextureAtlas region = new TextureAtlas(Gdx.files.internal("imgs/pack"));
    
85. Texture texture = region.findRegion("Enemy").getTexture();
    
86. TextureRegion[][] regions = TextureRegion.split(texture, 25, 33);
    
87. enemy = new Enemy(list, regions[1][2]);
    
88. stage.addActor(enemy);
    
89. InputMultiplexer inputMultiplexer = new InputMultiplexer();
    
90. inputMultiplexer.addProcessor(this);
    
91. inputMultiplexer.addProcessor(stage);
    
92. Gdx.input.setInputProcessor(inputMultiplexer);
    
93. }
    
94. 
    
95. @Override
    
96. public void dispose() {
    
97. // TODO Auto-generated method stub
    
98. 
    
99. }
    
100. 
     
101. @Override
     
102. public void pause() {
     
103. // TODO Auto-generated method stub
     
104. 
     
105. }
     
106. 
     
107. @Override
     
108. public void render() {
     
109. Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
     
110. OrthographicCamera c = (OrthographicCamera) stage.getCamera();
     
111. c.position.set(enemy.x, enemy.y, 0);
     
112. stage.act(Gdx.graphics.getDeltaTime());
     
113. tileMapRenderer.render(c);
     
114. stage.draw();
     
115. }
     
116. 
     
117. @Override
     
118. public void resize(int width, int height) {
     
119. // TODO Auto-generated method stub
     
120. 
     
121. }
     
122. 
     
123. @Override
     
124. public void resume() {
     
125. // TODO Auto-generated method stub
     
126. 
     
127. }
     
128. 
     
129. @Override
     
130. public boolean keyDown(int keycode) {
     
131. return false;
     
132. }
     
133. 
     
134. @Override
     
135. public boolean keyTyped(char character) {
     
136. // TODO Auto-generated method stub
     
137. return false;
     
138. }
     
139. 
     
140. @Override
     
141. public boolean keyUp(int keycode) {
     
142. // TODO Auto-generated method stub
     
143. return false;
     
144. }
     
145. 
     
146. @Override
     
147. public boolean scrolled(int amount) {
     
148. // TODO Auto-generated method stub
     
149. return false;
     
150. }
     
151. 
     
152. @Override
     
153. public boolean touchDown(int x, int y, int pointer, int button) {
     
154. return false;
     
155. }
     
156. 
     
157. @Override
     
158. public boolean touchDragged(int x, int y, int pointer) {
     
159. // TODO Auto-generated method stub
     
160. return false;
     
161. }
     
162. 
     
163. @Override
     
164. public boolean touchMoved(int x, int y) {
     
165. // TODO Auto-generated method stub
     
166. return false;
     
167. }
     
168. 
     
169. @Override
     
170. public boolean touchUp(int x, int y, int pointer, int button) {
     
171. Gdx.app.log("Info", "touchUp: x:" + x + " y: " + y + " pointer: "
     
172. + pointer + " button: " + button);
     
173. return false;
     
174. }
     
175. }

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分割线=====================================分割线

1. package com.cnblogs.htynkn.actors;
   
2. 
   
3. import java.util.ArrayList;
   
4. import java.util.List;
   
5. 
   
6. import com.badlogic.gdx.graphics.g2d.SpriteBatch;
   
7. import com.badlogic.gdx.graphics.g2d.TextureRegion;
   
8. import com.badlogic.gdx.math.MathUtil;
   
9. import com.badlogic.gdx.math.Vector2;
   
10. import com.badlogic.gdx.scenes.scene2d.Actor;
    
11. import com.badlogic.gdx.scenes.scene2d.ui.Image;
    
12. 
    
13. public class Enemy extends Image {
    
14. 
    
15. List vector2s = new ArrayList();
    
16. int currentIndex;
    
17. float stepLength = 1f;
    
18. 
    
19. public Enemy(List vector2s, TextureRegion region) {
    
20. super(region);
    
21. this.vector2s = vector2s;
    
22. currentIndex = 0;
    
23. this.x = vector2s.get(currentIndex).x;
    
24. this.y = vector2s.get(currentIndex).y;
    
25. }
    
26. 
    
27. @Override
    
28. public void draw(SpriteBatch batch, float parentAlpha) {
    
29. super.draw(batch, parentAlpha);
    
30. }
    
31. 
    
32. @Override
    
33. public Actor hit(float x, float y) {
    
34. return null;
    
35. }
    
36. @Override
    
37. public void act(float delta) {
    
38. int nextIndex = currentIndex + 1 >= vector2s.size() - 1 ? vector2s
    
39. .size() - 1 : currentIndex + 1;
    
40. Vector2 v1 = vector2s.get(currentIndex);
    
41. Vector2 v2 = vector2s.get(nextIndex);
    
42. if (MathUtil.distanceBetweenTwoPoints(new Vector2(this.x, this.y), v2) < 1) {
    
43. currentIndex = currentIndex + 1 < vector2s.size() - 1 ? currentIndex + 1
    
44. : vector2s.size() - 1;
    
45. nextIndex = currentIndex + 1 >= vector2s.size() - 1 ? vector2s
    
46. .size() - 1 : currentIndex + 1;
    
47. v1 = vector2s.get(currentIndex);
    
48. v2 = vector2s.get(nextIndex);
    
49. }
    
50. float x = Math.abs(v1.x - v2.x);
    
51. float y = Math.abs(v1.y - v2.y);
    
52. float z = (float) MathUtil.distanceBetweenTwoPoints(v1, v2);
    
53. float moveX = 0f;
    
54. float moveY = 0f;
    
55. moveX = (x / z) * stepLength;
    
56. moveY = (y / z) * stepLength;
    
57. if (this.x < v2.x) {
    
58. this.x += moveX;
    
59. } else {
    
60. this.x -= moveX;
    
61. }
    
62. if (this.y < v2.y) {
    
63. this.y += moveY;
    
64. } else {
    
65. this.y -= moveY;
    
66. }
    
67. System.out.println("pos: " + this.x + "," + this.y + " v1:"
    
68. + v1.toString() + " v2:" + v2.toString() + " d:" + z + " move:"
    
69. + moveX + " , " + moveY);
    
70. super.act(delta);
    
71. }
    
72. }

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