PhysicsShapeGroup2D.AddPolygon

参数

返回

int 返回多边形形状在 PhysicsShapeGroup2D 中被添加到其中的形状索引。在检索形状时，此索引用作主参考。

说明

向形状组添加多边形形状（PhysicsShapeType2D.Polygon）。

多边形形状由所有指定的 vertices 定义的多个边缘（线段）组成。

注意：一个多边形形成一个闭合形状，并且有内部，因此其内部可通过物理查询等检测到。

using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Assertions;

public class Example : MonoBehaviour
{
    void Start()
    {
        CreateShape();
        GetShapeFromCollider();
    }

    // Create a custom shape.
    void CreateShape()
    {
        // Create a shape group.
        var shapeGroup = new PhysicsShapeGroup2D();

        // Add a Polygon.
        var shapeIndex = shapeGroup.AddPolygon
            (
                vertices: new List<Vector2>
                {
                    new Vector2(-1f, -1f),
                    new Vector2(1f, -1f),
                    new Vector2(1f, 1f),
                    new Vector2(-1f, 1f)
                }
            );

        // Fetch the actual shape created.
        var physicsShape = shapeGroup.GetShape(shapeIndex);

        // Validate what we created.
        Assert.AreEqual(PhysicsShapeType2D.Polygon, physicsShape.shapeType);
        Assert.AreEqual(4, physicsShape.vertexCount);
    }

    // Get a physics shape from a Collider.
    void GetShapeFromCollider()
    {
        // Fetch the collider.
        var collider = GetComponent<PolygonCollider2D>();

        // If the collider is not active and enabled then we'll get no shapes.
        // Let's just quit if not.
        if (!collider.isActiveAndEnabled)
            return;

        // Configure the collider.
        collider.SetPath(0,
            new List<Vector2>()
            {
                new Vector2(-1f, -1f),
                new Vector2(1f, -1f),
                new Vector2(1f, 1f),
                new Vector2(-1f, 1f)
            });

        // Create a shape group.
        var shapeGroup = new PhysicsShapeGroup2D();

        // Get the collider shapes.
        collider.GetShapes(shapeGroup);

        // Fetch the actual shape.
        var physicsShape = shapeGroup.GetShape(0);

        // Validate what we retrieved.
        Assert.AreEqual(PhysicsShapeType2D.Polygon, physicsShape.shapeType);
        Assert.AreEqual(4, physicsShape.vertexCount);
    }
}