static Material GetMaterial(PolygonInfo polygonInfo)
{
var materialIndex = 0;
if (polygonInfo.bordered)
{
materialIndex = 1;
}
if (_materials[materialIndex] != null)
{
return(_materials[materialIndex]);
}
var mat = new Material(Shader.Find("Hidden/Shapes/Polygon"));
if (SystemInfo.supportsInstancing)
{
mat.enableInstancing = true;
}
var keywords = _materialKeywords[materialIndex];
if (keywords != null)
{
mat.shaderKeywords = keywords;
}
_materials[materialIndex] = mat;
return(mat);
}
static Mesh GenerateMeshPolygon(PolygonInfo polygonInfo)
{
var polygonMesh = new Mesh();
var vertices = new List <Vector3> {
Vector3.zero
};
var angleIncrement = (Mathf.PI * 2) / polygonInfo.sides;
for (var currentAngle = 0f; currentAngle < (Mathf.PI * 2); currentAngle += angleIncrement)
{
var x = Mathf.Cos(currentAngle);
var y = Mathf.Sin(currentAngle);
vertices.Add(new Vector3(x, y, 0f));
}
var triangles = new int[(vertices.Count - 1) * 3];
var triangleIndex = 0;
for (var vertexIndex = 1; vertexIndex < vertices.Count; vertexIndex++)
{
triangles[triangleIndex] = 0;
triangles[triangleIndex + 1] = vertexIndex;
triangles[triangleIndex + 2] = vertexIndex + 1;
if ((vertexIndex + 1) >= vertices.Count)
{
triangles[triangleIndex + 2] = 1;
}
triangleIndex += 3;
}
polygonMesh.SetVertices(vertices);
polygonMesh.triangles = triangles;
var uv = new Vector2[vertices.Count];
for (var uvIndex = 1; uvIndex < uv.Length; uvIndex++)
{
uv[uvIndex] = Vector2.one;
}
polygonMesh.uv = uv;
return(polygonMesh);
}
public static void Draw(PolygonInfo polygonInfo)
{
if (polygonInfo.sides < 2)
{
throw new ArgumentException("Polygon must have at least 3 sides");
}
var polygonMesh = GenerateMeshPolygon(polygonInfo);
var rotation = polygonInfo.rotation;
var polygonMatrix = Matrix4x4.TRS(polygonInfo.center, rotation, new Vector3(polygonInfo.size, polygonInfo.size, 1f));
var materialPropertyBlock = GetMaterialPropertyBlock(polygonInfo);
var material = GetMaterial(polygonInfo);
Graphics.DrawMesh(polygonMesh, polygonMatrix, material, 0, null, 0, materialPropertyBlock);
}
static MaterialPropertyBlock GetMaterialPropertyBlock(PolygonInfo polygonInfo)
{
if (_materialPropertyBlock == null)
{
_materialPropertyBlock = new MaterialPropertyBlock();
}
_materialPropertyBlock.SetColor(FillColorParam, polygonInfo.color);
_materialPropertyBlock.SetFloat(AASmoothingParam, antiAliasingSmoothing);
if (polygonInfo.bordered)
{
_materialPropertyBlock.SetColor(BorderColorParam, polygonInfo.borderColor);
var borderWidthNormalized = polygonInfo.borderWidth / polygonInfo.size;
_materialPropertyBlock.SetFloat(FillWidthParam, 1.0f - borderWidthNormalized);
}
return(_materialPropertyBlock);
}
