private static double CalculateAngleSign(Axis3D cylinderAxis, Position3D start, Position3D end)
{
var axisFrame = Matrix44D.CreateRotation(cylinderAxis.Offset, cylinderAxis.Direction);
Matrix44D invframe = axisFrame.Inverse();
var startInFrame = invframe * start;
var endInFrame = invframe * end;
var sx = startInFrame.X;
var sy = startInFrame.Y;
var ex = endInFrame.X;
var ey = endInFrame.Y;
var sign = TriangleMath.IsCounterClockwise(sx, sy, ex, ey, 0.0, 0.0) ? 1.0 : -1.0;
return(sign);
}
private void CreateMeshMaskByPolygonCollider2D()
{
#if UNITY_EDITOR
//把顶点归一化
vertices = polygon2d.GetPath(0).ToList();
if (vertices[0] == vertices[vertices.Count - 1])
{
vertices.RemoveAt(vertices.Count - 1);
}
Stopwatch sw = new Stopwatch();
sw.Start();
TriangleMath tr = new TriangleMath(vertices.ToArray());
triangles = tr.Triangulate().ToList();
sw.Stop();
UnityEngine.Debug.Log("三角化耗时:" + sw.ElapsedMilliseconds + "ms");
#endif
}
private void CreateMeshMaskByImage()
{
#if UNITY_EDITOR
GameObject o = Selection.activeGameObject;
if (o != null && o.GetComponent <Image>() != null)
{
Image img = o.GetComponent <Image>();
string path = AssetDatabase.GetAssetPath(img.mainTexture);
if (!string.IsNullOrEmpty(path))
{
TextureImporter textureImporter = AssetImporter.GetAtPath(path) as TextureImporter;
TextureImporterSettings cacheSettings = new TextureImporterSettings();
textureImporter.ReadTextureSettings(cacheSettings);
//将Texture临时设置为可读写
TextureImporterSettings tmp = new TextureImporterSettings();
textureImporter.ReadTextureSettings(tmp);
tmp.readable = true;
textureImporter.SetTextureSettings(tmp);
AssetDatabase.ImportAsset(path);
SobelEdgeDetection sobel = new SobelEdgeDetection();
Texture2D targetT2d = sobel.Detect(img.mainTexture as Texture2D);
List <Vector2> vertices = EdgeUtil.GetPoints(targetT2d);
for (int i = 0; i < vertices.Count; i++)
{
Vector3 vec = vertices[i];
vec.x -= targetT2d.width * 0.5f;
vec.y -= targetT2d.height * 0.5f;
//vec.x /= targetT2d.width;
//vec.y /= targetT2d.height;
vertices[i] = vec;
}
//恢复Texture设置
textureImporter.SetTextureSettings(cacheSettings);
AssetDatabase.ImportAsset(path);
MeshMask mm = o.GetComponent <MeshMask>();
PolygonCollider2D polygon2d = o.GetComponent <PolygonCollider2D>();
if (mm == null)
{
mm = o.AddComponent <MeshMask>();
}
if (polygon2d == null)
{
polygon2d = o.AddComponent <PolygonCollider2D>();
}
vertices = vertices.Select(p =>
{
return(new Vector2(p.x / img.mainTexture.width * image.rectTransform.rect.width, p.y / img.mainTexture.height * image.rectTransform.rect.height));
}).ToList();
polygon2d.SetPath(0, vertices.ToArray());
mm.vertices = polygon2d.GetPath(0).ToList();
if (mm.vertices[0] == mm.vertices[vertices.Count - 1])
{
mm.vertices.RemoveAt(mm.vertices.Count - 1);
}
Stopwatch sw = new Stopwatch();
sw.Start();
TriangleMath tr = new TriangleMath(mm.vertices.ToArray());
mm.triangles = tr.Triangulate().ToList();
sw.Stop();
UnityEngine.Debug.Log("三角化耗时:" + sw.ElapsedMilliseconds + "ms");
AssetDatabase.Refresh();
}
else
{
UnityEngine.Debug.LogError("Image组件还没设置图片");
}
}
else
{
UnityEngine.Debug.LogError("选中物体需要有Image组件才能生成PolygonImage");
}
#endif
}
/// <summary>
/// Determines whether this quad contains the specified point.
/// </summary>
/// <param name="v">The point</param>
/// <returns>
/// <c>true</c> if quad contains the specified point; otherwise, <c>false</c>.
/// </returns>
public bool Contains(Point pt)
{
// breaking quad into 2 triangles,
// points contains in quad, if it contains in at least one half-triangle of it.
return(TriangleMath.TriangleContains(v00, v01, v11, pt) || TriangleMath.TriangleContains(v00, v10, v11, pt));
}
public void IsCounterClockwiseTest1()
{
var res = TriangleMath.IsCounterClockwise(10, 10, 10, 10, 0, 0);
}
