下面是插件的原码：
using UnityEngine;
using System.Collections; public class ArrowSet : MonoBehaviour { public Texture arrow; private Camera cam; private float xCenter; private float yCenter; private float screenSlope; private float halfSize; public float size = 30; private bool errorless = false; public string tagToFind = "Enemy"; public float hoverAngle = 270; public float distanceAbove = 30; public float blindSpot = 5.0f; public bool hoverOnScreen = true; void Start() { Camera theCam = gameObject.GetComponent<Camera>(); if (gameObject.GetComponent<Camera>()) { cam = theCam; if (arrow != null) { errorless = true; } else { Debug.Log("请附上一个箭头纹理雷达箭脚本。"); errorless = false; } } else { Debug.Log("雷达箭头必须连接到一个摄像机。"); } } void OnGUI() { if (Event.current.type.Equals(EventType.Repaint) && errorless) { xCenter = cam.pixelWidth / 2; yCenter = cam.pixelHeight / 2; screenSlope = ((float)cam.pixelHeight) / cam.pixelWidth; halfSize = size / 2; GameObject[] objects = GameObject.FindGameObjectsWithTag(tagToFind); foreach (GameObject ob in objects) { float angle = hoverAngle - 180; double rad = angle * (Mathf.PI / 180.0); Vector3 arrowPos = cam.transform.right * Mathf.Cos((float)rad) + cam.transform.up * Mathf.Sin((float)rad); Vector3 worldPos = ob.transform.position + (arrowPos * distanceAbove); //世界转视口 Vector3 pos = cam.WorldToViewportPoint(worldPos); //Debug.Log(pos); if (pos.z < 0) { pos.x *= -1; pos.y *= -1; } if (pos.z > 0 || (pos.z < 0 && (pos.x > 0.5f + (blindSpot / 2) || pos.x < 0.5f - (blindSpot / 2)) && (pos.y < 0.5f - (blindSpot / 2) || pos.y > 0.5f + (blindSpot / 2)))) { //找到新的位置 float newX = pos.x * cam.pixelWidth; //相机坐标垂直翻转相比，像素坐标 float newY = cam.pixelHeight - pos.y * cam.pixelHeight; 如果对象是屏幕外 if (pos.z < 0 || newY < 0 || newY > cam.pixelHeight || newX < 0 || newX > cam.pixelWidth) { float a = CalculateAngle(cam.pixelWidth / 2, cam.pixelHeight / 2, newX, newY); Vector2 coord = ProjectToEdge(newX, newY); GUIUtility.RotateAroundPivot(a, coord); Graphics.DrawTexture(new Rect(coord.x - halfSize, coord.y - halfSize, size, size), arrow); GUIUtility.RotateAroundPivot(-a, coord); } else if (hoverOnScreen) { Debug.Log(222); float nh = Mathf.Sin((float)rad) * size; float nw = Mathf.Cos((float)rad) * size; //当在屏幕上，只需旋转90度，并绘制 GUIUtility.RotateAroundPivot(-angle + 180, new Vector2(newX + nw, newY - nh)); Graphics.DrawTexture(new Rect(newX + nw, newY - nh - halfSize, size, size), arrow, null); GUIUtility.RotateAroundPivot(angle - 180, new Vector2(newX + nw, newY - nh)); } } } } } float CalculateAngle(float x1, float y1, float x2, float y2) { float xDiff = x2 - x1; float yDiff = y2 - y1; float rad = Mathf.Atan(yDiff / xDiff); float deg = rad * 180 / Mathf.PI; if (xDiff < 0) { deg += 180; } return deg; } Vector2 ProjectToEdge(float x2, float y2) { float xDiff = x2 - (cam.pixelWidth / 2); float yDiff = y2 - (cam.pixelHeight / 2); float slope = yDiff / xDiff; Vector2 coord = new Vector2(0, 0); float ratio; if (slope > screenSlope || slope < -screenSlope) { //project on top/bottom ratio = (yCenter - halfSize) / yDiff; if (yDiff < 0) { coord.y = halfSize; ratio *= -1; } else coord.y = cam.pixelHeight - halfSize; coord.x = xCenter + xDiff * ratio; } else { //project on left/right ratio = (xCenter - halfSize) / xDiff; if (xDiff < 0) { coord.x = halfSize; ratio *= -1; } else coord.x = cam.pixelWidth - halfSize; coord.y = yCenter + yDiff * ratio; } return coord; }}
以前代码在 Unity4.6运行良好，但在Untiy5以后的版本就有BUG，上下方向的怪物好使，左右的不显示UI，经过查找发现Camera.pixelWidth和Camera.pixelHeight不再是float值，而是int类型，我们之需要将它们转成flaot就可以修复这个BUG
screenSlope = ((float)cam.pixelHeight) / cam.pixelWidth;
