tk2d的tilemap demo的脚本研究

 tilemap的demo脚本，大概注释一下

tk2dTileMapDemoPlayer.cs主要是控制玩家的行动和检测金币的碰撞，及时处理文字。

using UnityEngine;
using System.Collections;

public class tk2dTileMapDemoPlayer : MonoBehaviour {

	public tk2dTextMesh textMesh;//得分
	public tk2dTextMesh textMeshLabel;//score

	Vector3 textMeshOffset;//装B，不用附属关系，手动保存偏移量，用来设置坐标
	bool textInitialized = false;

	public float addForceLimit = 1.0f;
	public float amount = 500.0f;
	public float torque = 50;
	tk2dSprite sprite;
	int score = 0;
	float forceWait = 0;
	float moveX = 0.0f;
	bool AllowAddForce { get { return forceWait < 0.0f; } }

	void Awake() {
		sprite = GetComponent<tk2dSprite>();

		if (textMesh == null || textMesh.transform.parent != transform) {
			Debug.LogError("Text mesh must be assigned and parented to player.");
			enabled = false;
		}

		textMeshOffset = textMesh.transform.position - transform.position;
		textMesh.transform.parent = null;

//上面这几行就是装B，它一定要确保textmesh的父物体是玩家，然后保存textmesh和player坐标的偏移量后，把textmesh的父物体设置为空。
		
		textMeshLabel.text = "instructions";
		textMeshLabel.Commit();

		if (Application.platform == RuntimePlatform.WindowsEditor || Application.platform == RuntimePlatform.WindowsPlayer || Application.platform == RuntimePlatform.WindowsWebPlayer ||
			Application.platform == RuntimePlatform.OSXEditor || Application.platform == RuntimePlatform.OSXPlayer || Application.platform == RuntimePlatform.OSXWebPlayer || Application.platform == RuntimePlatform.OSXDashboardPlayer) {
			textMesh.text = "LEFT ARROW / RIGHT ARROW";
		}
		else {
			textMesh.text = "TAP LEFT / RIGHT SIDE OF SCREEN";
		}
		textMesh.Commit();


//上面几行是设置提示信息
		Application.targetFrameRate = 60;
	}
	
	void Update() {
		forceWait -= Time.deltaTime;


//根据是否等待状态设置精灵的图像，绿色和红色
		string spriteName = AllowAddForce ? "player" : "player_disabled";
		if (sprite.CurrentSprite.name != spriteName) {
			sprite.SetSprite(spriteName);
		}

		if (AllowAddForce) {
			float x = 0;

			if (Input.GetKeyDown(KeyCode.RightArrow)) x = 1;
			else if (Input.GetKeyDown(KeyCode.LeftArrow)) x = -1;

			for (int i = 0; i < Input.touchCount; ++i) {
				if (Input.touches[i].phase == TouchPhase.Began) {
					x = Mathf.Sign(Input.touches[i].position.x - Screen.width * 0.5f);
					break;
				}
			}

			if (x != 0) {
				// make sure text meshes are changed on first button press / touch
//这里是按下控制键后，消去提示信息，只执行一次。


				if (!textInitialized) {
					textMeshLabel.text = "score";
					textMeshLabel.Commit();
					textMesh.text = "0";
					textMesh.Commit();
					textInitialized = true;
				}

				// The actual applying of force is deferred to the next FixedUpdate for predictable
				// physics behaviour
				moveX = x;
			}
		}

		textMesh.transform.position = transform.position + textMeshOffset;
	}



//处理Rigidbody时，需要用FixedUpdate代替Update

	void FixedUpdate () {
		if (AllowAddForce && moveX != 0) {
			forceWait = addForceLimit;
			rigidbody.AddForce(new Vector3(moveX * amount, amount, 0) * Time.deltaTime, ForceMode.Impulse);//施加力
			rigidbody.AddTorque(new Vector3(0,0,-moveX * torque) * Time.deltaTime, ForceMode.Impulse);//施加力矩，使player绕z轴旋转。
			moveX = 0;
		}
	}

	void OnTriggerEnter(Collider other) {
		Destroy( other.gameObject );

		score++;
		
		textMesh.text = score.ToString();
		textMesh.Commit();
	}
}

tk2dTileMapDemoFollowCam.cs主要是跟随玩家，并达到平滑缩放的效果

using UnityEngine;
using System.Collections;

public class tk2dTileMapDemoFollowCam : MonoBehaviour {

	tk2dCamera cam;
	public Transform target;
	public float followSpeed = 1.0f;

	public float minZoomSpeed = 20.0f;
	public float maxZoomSpeed = 40.0f;

	public float maxZoomFactor = 0.6f;

	void Awake() {
		cam = GetComponent<tk2dCamera>();
	}

	void FixedUpdate() {
		Vector3 start = transform.position;

//摄像头坐标向玩家坐标移动
		Vector3 end = Vector3.MoveTowards(start, target.position, followSpeed * Time.deltaTime);
		end.z = start.z;
		transform.position = end;
		
		if (target.rigidbody != null && cam != null) {

//根据player的速度向量，生成一个0~1之间的因子，用线性插值的方法确定缩放率，达到平滑过渡视野的效果，MoveTowards效果实际上和 Mathf.Lerp相同。
			float spd = target.rigidbody.velocity.magnitude;
			float scl = Mathf.Clamp01((spd - minZoomSpeed) / (maxZoomSpeed - minZoomSpeed));
			float targetZoomFactor = Mathf.Lerp(1, maxZoomFactor, scl);
			cam.ZoomFactor = Mathf.MoveTowards(cam.ZoomFactor, targetZoomFactor, 0.2f * Time.deltaTime);
		}
	}
}

tk2dTileMapDemoCoin.cs就是金币不在摄像头视野时不工作，提高效率。

通过这三个脚本，我大概学习了player的行为控制，之前我都是直接改transform，导致刚体之间可以穿过；摄像头平常我也只是简单的用lookat来实现跟随，当然这看情况。在rpg游戏中都是这样普通跟随，比如dnf的城镇移动和副本移动，只有在特殊的镜头才会缩放。在太空游戏中，我就觉得缩放效果会更好一点，飞船加速时预览更大的地图，游览星际。