Created
November 28, 2017 17:36
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Triangle Prefab Script
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| public class DrawTriangle : DrawShape | |
| { | |
| // ... | |
| private PolygonCollider2D _polygonCollider2D; | |
| // Triangle vertices (in absolute coordinates) | |
| private readonly List<Vector2> _vertices = new List<Vector2>(3); | |
| public override bool ShapeFinished { get { return _vertices.Count >= 3; } } | |
| // ... | |
| private void Awake() | |
| { | |
| // ... | |
| _polygonCollider2D = GetComponent<PolygonCollider2D>(); | |
| } | |
| // ... | |
| public override void UpdateShape(Vector2 newVertex) | |
| { | |
| if (_vertices.Count < 2) { | |
| return; | |
| } | |
| _vertices[_vertices.Count - 1] = newVertex; | |
| // Set the gameobject's position to be the center of mass | |
| var center = _vertices.Centroid(); | |
| transform.position = center; | |
| // Update the mesh relative to the transform | |
| var relativeVertices = _vertices.Select(v => v - center).ToArray(); | |
| _meshFilter.mesh = PolygonMesh(relativeVertices, FillColor); | |
| // ... | |
| // Update the collider | |
| _polygonCollider2D.points = relativeVertices; | |
| } | |
| /// <summary> | |
| /// Creates and returns a polygon mesh given a list of its vertices. | |
| /// </summary> | |
| private static Mesh PolygonMesh(Vector2[] vertices, Color fillColor) | |
| { | |
| // Find all the triangles in the shape | |
| var triangles = new Triangulator(vertices).Triangulate(); | |
| // Assign each vertex the fill color | |
| var colors = Enumerable.Repeat(fillColor, vertices.Length).ToArray(); | |
| var mesh = new Mesh { | |
| name = "Triangle", | |
| vertices = vertices.ToVector3(), | |
| triangles = triangles, | |
| colors = colors | |
| }; | |
| mesh.RecalculateNormals(); | |
| mesh.RecalculateBounds(); | |
| return mesh; | |
| } | |
| } |
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