类似愤怒小鸟的飞行弹道

来源：互联网发布：淘宝开店注意事项编辑：程序博客网时间：2024/04/29 22:42

抛体运动的类型：
"很多子弹不仅垂直运动而且追随着水平的运动。那就，当他们向上移动或向下运动时也正在水平方向移动。弹体的运动 — — 横向和纵向

运动的两个组成部分。
垂直运动：
在垂直运动，重力作用在物体上，并给予负加速度"-9.8 m/s²"(重心加速度)。这意味着物体的速度在每一秒减小-9.8 米/² 。自由落体的速度是 V = g * t。如果我们有初始速度那么，物体下落速度方程： V = Vi + g * t 加速度是-9.8 m/s²,在做自由落体时距离的计算方程；S= 1/2 * g * t * t ；考虑对象的初始速度情况下的

公式计算；S = Vi * t - 1/2 * g * t * t ；距离被减去，因为 g 的方向是向下。
横向运动：
在水平运动，没有外力作用在水平方向匀速运动。因而在此基础上，是恒定的速度的 X 分量，在 X 方向的加速度为零。下面给出了用于计算距离和速度方程。S = v * t ；下面是简单的 c# 代码，将显示球的弹道路径时它会沿着路径抛出。
注：添加如下脚本到枪炮对象上。创建 prefebs 球和轨迹点将运行时实例化。球必须有Collider和Rigidbody。
截图：

using UnityEngine;using System.Collections;using System.Collections.Generic;public class CannonScript : MonoBehaviour {// TrajectoryPoint and Ball will be instantiated    public GameObject TrajectoryPointPrefeb;    public GameObject BallPrefb;        private GameObject ball;    private bool isPressed, isBallThrown;    private float power = 25;    private int numOfTrajectoryPoints = 30;    private List trajectoryPoints;    //---------------------------------------        void Start ()    {        trajectoryPoints = new List();        isPressed = isBallThrown =false;//   TrajectoryPoints are instatiated        for(int i=0;i<numOfTrajectoryPoints;i++)        {            GameObject dot= (GameObject) Instantiate(TrajectoryPointPrefeb);            dot.renderer.enabled = false;            trajectoryPoints.Insert(i,dot);        }    }    //---------------------------------------        void Update ()     {        if(isBallThrown)            return;        if(Input.GetMouseButtonDown(0))        {            isPressed = true;            if(!ball)                createBall();        }        else if(Input.GetMouseButtonUp(0))        {            isPressed = false;            if(!isBallThrown)            {                throwBall();            }        }    // when mouse button is pressed, cannon is rotated as per mouse movement and projectile trajectory path is displayed.        if(isPressed)        {            Vector3 vel = GetForceFrom(ball.transform.position,Camera.main.ScreenToWorldPoint(Input.mousePosition));            float angle = Mathf.Atan2(vel.y,vel.x)* Mathf.Rad2Deg;            transform.eulerAngles = new Vector3(0,0,angle);            setTrajectoryPoints(transform.position, vel/ball.rigidbody.mass);        }    }    //---------------------------------------        // Following method creates new ball    //---------------------------------------        private void createBall()    {        ball = (GameObject) Instantiate(BallPrefb);        Vector3 pos = transform.position;        pos.z=1;        ball.transform.position = pos;        ball.SetActive(false);    }    //---------------------------------------    // Following method gives force to the ball    //---------------------------------------        private void throwBall()    {        ball.SetActive(true);            ball.rigidbody.useGravity = true;        ball.rigidbody.AddForce(GetForceFrom(ball.transform.position,Camera.main.ScreenToWorldPoint(Input.mousePosition)),ForceMode.Impulse);        isBallThrown = true;    }    //---------------------------------------    // Following method returns force by calculating distance between given two points    //---------------------------------------        private Vector2 GetForceFrom(Vector3 fromPos, Vector3 toPos)    {        return (new Vector2(toPos.x, toPos.y) - new Vector2(fromPos.x, fromPos.y))*power;    }    //---------------------------------------        // Following method displays projectile trajectory path. It takes two arguments, start position of object(ball) and initial velocity of object(ball).    //---------------------------------------        void setTrajectoryPoints(Vector3 pStartPosition , Vector3 pVelocity )    {        float velocity = Mathf.Sqrt((pVelocity.x * pVelocity.x) + (pVelocity.y * pVelocity.y));        float angle = Mathf.Rad2Deg*(Mathf.Atan2(pVelocity.y , pVelocity.x));        float fTime = 0;                fTime += 0.1f;        for (int i = 0 ; i < numOfTrajectoryPoints ; i++)        {            float dx = velocity * fTime * Mathf.Cos(angle * Mathf.Deg2Rad);            float dy = velocity * fTime * Mathf.Sin(angle * Mathf.Deg2Rad) - (Physics2D.gravity.magnitude * fTime * fTime / 2.0f);            Vector3 pos = new Vector3(pStartPosition.x + dx , pStartPosition.y + dy ,2);            trajectoryPoints[i].transform.position = pos;            trajectoryPoints[i].renderer.enabled = true;            trajectoryPoints[i].transform.eulerAngles = new Vector3(0,0,Mathf.Atan2(pVelocity.y - (Physics.gravity.magnitude)*fTime,pVelocity.x)*Mathf.Rad2Deg);            fTime += 0.1f;        }    }}

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