摄像机响应用户操作移动

项目地址
素材包

镜头控制插件

目标

在RTS游戏和一些需要显示地图的RPG游戏中,常常出现用鼠标和键盘的方向键操作 玩家镜头的移动,从而达到自由观看游戏场景的效果
本篇的目标就是实现这一效果

1. wasd 分别对应镜头的 上,左,下,右 移动
2. 鼠标移动到屏幕边缘时, 镜头向对应方向卷动
3. 滚动鼠标滚轮时, 视角拉近,拉远

API

1. 获取键盘按键: Input.GetKey("w")
2. 获取鼠标位置: Input.mousePosition
3. 获取屏幕大小: Screen.width/Screen.height
4. 限制值的范围: Mathf.Clamp(value,min,max)

实际应用:

1. 将场景的摄像机调节成 x增大 镜头左移, z增大 镜头上移, y增大 镜头拉远. 并对摄像机添加脚本CameraController
2. 创建镜头滚动的配置参数: PanSpeed(镜头移动速度), ScrollSpeed(镜头深度变化速度)等
3. 在Update()方法中 添加对应键盘,鼠标事件的监听,并对保存的镜头position临时变量赋值
4. 确认position的边界条件,再设置到镜头的Transform中

CameraController

using UnityEngine;

public class CameraController : MonoBehaviour
{
    public float PanSpeed = 20f;
    public float ScrollSpeed = 20f;
    public float PanBoarderThiness = 100f;

    public Vector2 PanLimit;
    public float MinY = 20f;
    public float MaxY = 100f;

    void Update()
    {
        Vector3 pos = transform.position;

        if (Input.GetKey("w") || MouseAtScreenTopEdge())
        {
            pos.z += PanSpeed * Time.deltaTime;
        }
        if (Input.GetKey("s") || MouseAtScreenBottomEdge())
        {
            pos.z -= PanSpeed * Time.deltaTime;
        }
        if (Input.GetKey("a") || MouseAtScreenLeftEdge())
        {
            pos.x -= PanSpeed * Time.deltaTime;
        }
        if (Input.GetKey("d") || MouseAtScreenRightEdge())
        {
            pos.x += PanSpeed * Time.deltaTime;
        }
        float scroll = Input.GetAxis("Mouse ScrollWheel");
        pos.y +=  scroll * ScrollSpeed * Time.deltaTime;

        pos.x = Mathf.Clamp(pos.x, -PanLimit.x, PanLimit.x);
        pos.z = Mathf.Clamp(pos.z, -PanLimit.y, PanLimit.y);
        pos.y =  Mathf.Clamp(pos.y,MinY,MaxY);

        transform.position = pos;
    }

    bool MouseAtScreenTopEdge()
    {
        return Input.mousePosition.y >= Screen.height - PanBoarderThiness && Input.mousePosition.y <= Screen.height;
    }

    bool MouseAtScreenBottomEdge()
    {
        return Input.mousePosition.y <= PanBoarderThiness && Input.mousePosition.y >= 0;
    }

    bool MouseAtScreenLeftEdge()
    {
        return Input.mousePosition.x <= PanBoarderThiness && Input.mousePosition.x >= 0;
    }

    bool MouseAtScreenRightEdge()
    {
        return Input.mousePosition.x >= Screen.width - PanBoarderThiness && Input.mousePosition.x <= Screen.width;
    }

}