以防遗忘001_通过斜率求垂直线段的端点，附Unity(UI image)画线

1、已知两点A,B

2、两点构成线段P

3、线段P1与P垂直并经过A，两端为C、D

4、线段P2与P垂直并经过B，两端为E、F

5、P1、P2长度为100，A/B分别为两个线段中点

求P2、P2的4个端点C、D、E、F

void testCode(Vector2 A, Vector2 B){float k = getSlope(B, A);float angle;Vector2 C = Vector2.zero;Vector2 D = Vector2.zero;Vector2 E = Vector2.zero;Vector2 F = Vector2.zero;if (float.IsInfinity(k)){//斜率不存在，与y轴平行，为竖线//print(k);C = new Vector2(B.x - pointOffset, B.y);D = new Vector2(B.x + pointOffset, B.y);E = new Vector2(A.x - pointOffset, A.y);F = new Vector2(A.x + pointOffset, A.y);GlobalFunction.Instance.drawRect(C, D, E, F);return;}if (k == 0){//斜率=0，与x轴平行，为横线//print(angle);C = new Vector2(B.x, B.y - pointOffset);D = new Vector2(B.x, B.y + pointOffset);E = new Vector2(A.x, A.y - pointOffset);F = new Vector2(A.x, A.y + pointOffset);GlobalFunction.Instance.drawRect(C, D, E, F);return;}if (k > 0){//锐角angle = Mathf.Atan(k) * 180 / Mathf.PI;float newAngle = (90 - angle) / 180 * Mathf.PI; // 180 - 90 - anglefloat x1 = Mathf.Cos(newAngle) * pointOffset;float y1 = Mathf.Sin(newAngle) * pointOffset;C = new Vector2(B.x - x1, B.y + y1);D = new Vector2(B.x + x1, B.y - y1);E = new Vector2(A.x - x1, A.y + y1);F = new Vector2(A.x + x1, A.y - y1);GlobalFunction.Instance.drawRect(C, D, E, F);return;}if (k < 0){//钝角angle = Mathf.Atan(k) * 180 / Mathf.PI;//print(angle);float newAngle = (90 - angle) / 180 * Mathf.PI; // 90 - anglefloat x1 = Mathf.Cos(newAngle) * pointOffset;float y1 = Mathf.Sin(newAngle) * pointOffset;C = new Vector2(B.x + x1, B.y - y1);D = new Vector2(B.x - x1, B.y + y1);E = new Vector2(A.x + x1, A.y - y1);F = new Vector2(A.x - x1, A.y + y1);GlobalFunction.Instance.drawRect(C, D, E, F);return;}}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;public class GlobalFunction : SceneMonoSingleton<GlobalFunction>
{public Text text = null;public List<RectTransform> pointList = new List<RectTransform>();public Material mat = null;public Image img = null;private Image p1 = null;private Image p2 = null;private Image p3 = null;private Image p4 = null;void Start(){p1 = Instantiate(img);p1.name = "p1";p2 = Instantiate(img);p2.name = "p2";p3 = Instantiate(img);p3.name = "p3";p4 = Instantiate(img);p4.name = "p4";p1.transform.SetParent(img.transform);p2.transform.SetParent(img.transform);p3.transform.SetParent(img.transform);p4.transform.SetParent(img.transform);}public void drawRect(Vector2 C, Vector2 D, Vector2 E, Vector2 F){//画线float x1 = p1.GetComponent<RectTransform>().sizeDelta.x;float y1 = Vector2.Distance(C, D);p1.GetComponent<RectTransform>().sizeDelta = new Vector2(x1, y1);p1.GetComponent<RectTransform>().anchoredPosition = C;float a1 = Vector2.SignedAngle(C - D, Vector2.down);p1.transform.localRotation = Quaternion.AngleAxis(-a1, Vector3.forward);float x2 = p2.GetComponent<RectTransform>().sizeDelta.x;float y2 = Vector2.Distance(D, F);p2.GetComponent<RectTransform>().sizeDelta = new Vector2(x2, y2);p2.GetComponent<RectTransform>().anchoredPosition = D;float a2 = Vector2.SignedAngle(D - F, Vector2.down);p2.transform.localRotation = Quaternion.AngleAxis(-a2, Vector3.forward);float x3 = p3.GetComponent<RectTransform>().sizeDelta.x;float y3 = Vector2.Distance(F, E);p3.GetComponent<RectTransform>().sizeDelta = new Vector2(x3, y3);p3.GetComponent<RectTransform>().anchoredPosition = F;float a3 = Vector2.SignedAngle(F - E, Vector2.down);p3.transform.localRotation = Quaternion.AngleAxis(-a3, Vector3.forward);float x4 = p4.GetComponent<RectTransform>().sizeDelta.x;float y4 = Vector2.Distance(E, C);p4.GetComponent<RectTransform>().sizeDelta = new Vector2(x4, y4);p4.GetComponent<RectTransform>().anchoredPosition = E;float a4 = Vector2.SignedAngle(E - C, Vector2.down);p4.transform.localRotation = Quaternion.AngleAxis(-a4, Vector3.forward);text.text = string.Empty;text.text += "C = " + C + "\r\n";text.text += "D = " + D + "\r\n";text.text += "E = " + E + "\r\n";text.text += "F = " + F + "\r\n";}public void SceneQuit(){
#if UNITY_EDITORUnityEditor.EditorApplication.isPlaying = false;
#endifApplication.Quit();}
}

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以防遗忘001_通过斜率求垂直线段的端点，附Unity(UI image)画线

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