ArcMeshData MakeMeshData()
{
ArcMeshData top = MakeArcMeshData(false);
ArcMeshData bottom = MakeArcMeshData(true);
for (int i = 0; i < bottom.triangles.Length; i++)
{
bottom.triangles[i] += top.vertices.Length;
}
List <int> tris = new List <int>();
tris.AddRange(top.triangles);
tris.AddRange(bottom.triangles);
int[] _tris = tris.ToArray();
List <Vector2> verts = new List <Vector2>();
verts.AddRange(top.vertices);
verts.AddRange(bottom.vertices);
Vector2[] _verts = verts.ToArray();
return(new ArcMeshData()
{
vertices = _verts,
triangles = _tris
});
}
ArcMeshData MakeArcMeshData(bool reverse)
{
int vertexCount = arcSides * 2;
int arcVertex = arcSides * 2 + 2;
Vector2[] _vertices = new Vector2[arcVertex];
int[] _triangles = new int[vertexCount * 3];
float angleStep = (startAngleDeg - endAngleDeg) / (float)arcSides;
int steps = arcSides + 1;
var offset = new Vector2(arcRadius * svgPixelsPerUnit / 2, arcRadius * svgPixelsPerUnit / 2);
for (int i = 0; i < steps; i++)
{
float angle = endAngleDeg + i * angleStep;
Vector2 dir = GetAngleVectorByDegree(angle);
var correctedRadius = arcRadius * svgPixelsPerUnit / 2;
var correctedMaskRadius = maskRadius * svgPixelsPerUnit / 2;
Vector2 outer = dir * correctedRadius;
Vector2 inner = outer - dir * (correctedMaskRadius > correctedRadius ? 0 : correctedRadius - correctedMaskRadius);
_vertices[i * 2] = inner + offset;
_vertices[i * 2 + 1] = outer + offset;
int ti = i * 6; //triangle index
{
if (i < arcSides)
{
if (reverse)
{
_triangles[ti] = i * 2 + 1;
_triangles[ti + 1] = i * 2 + 0;
_triangles[ti + 2] = i * 2 + 2;
_triangles[ti + 3] = i * 2 + 3;
_triangles[ti + 4] = i * 2 + 1;
_triangles[ti + 5] = i * 2 + 2;
}
else
{
_triangles[ti] = i * 2 + 1;
_triangles[ti + 1] = i * 2 + 2;
_triangles[ti + 2] = i * 2 + 0;
_triangles[ti + 3] = i * 2 + 3;
_triangles[ti + 4] = i * 2 + 2;
_triangles[ti + 5] = i * 2 + 1;
}
}
}
}
ArcMeshData info = new ArcMeshData();
info.triangles = _triangles;
info.vertices = _vertices;
return(info);
}
Sprite BuildArcSprite()
{
ArcMeshData arcMeshData = MakeMeshData();
var pivot = Vector2.one / 2;
Texture2D texture = null;
var correctedRadius = arcRadius * svgPixelsPerUnit / 2;
var rect = new Rect(-correctedRadius, -correctedRadius, correctedRadius * 2, correctedRadius * 2);
var spriteCreateMethod = typeof(Sprite).GetMethod("Create", BindingFlags.Static | BindingFlags.NonPublic, Type.DefaultBinder, new Type[] { typeof(Rect), typeof(Vector2), typeof(float), typeof(Texture2D) }, null);
var sprite = spriteCreateMethod.Invoke(null, new object[] { rect, pivot, svgPixelsPerUnit, texture }) as Sprite;
sprite.OverrideGeometry(arcMeshData.vertices.ToArray(), arcMeshData.triangles.Select(t => (UInt16)t).ToArray());
var color32 = Enumerable.Repeat(color, arcMeshData.vertices.Length).Select(c => (Color32)c);
using (var nativeColors = new NativeArray <Color32>(color32.ToArray(), Allocator.Temp))
SpriteDataAccessExtensions.SetVertexAttribute <Color32>(sprite, VertexAttribute.Color, nativeColors);
return(sprite);
}
