/// <summary>
/// 線対称の位置を計算
/// </summary>
/// <param name="v"></param>
/// <param name="start">線対称の線の始点</param>
/// <param name="end">線対称の線の終点</param>
/// <returns></returns>
Vector2 CalcSymmetricPoint(Vector2 v, Vector2 start, Vector2 end)
{
var v0 = end - start;
var a0 = MathF.Atan2(v0.Y, v0.X);
var v1 = v - start;
var a1 = MathF.Atan2(v1.Y, v1.X);
var a = a0 - (a1 - a0);
var l = CmUtils.Length(v, start);
Vector2 vn = new Vector2(l * MathF.Cos(a), l * MathF.Sin(a));
vn += start;
return(vn);
}
/// <summary>
/// 直線をベジェに変換、コントロールポイントは直線上に1/3の長さで設定
/// </summary>
/// <returns></returns>
internal bool ConvertToCurve()
{
var p0 = befor.GetPoint();
var p1 = GetPoint();
var l = CmUtils.Length(p0, p1) / 3;
var rad = MathF.Atan2(p1.Y - p0.Y, p1.X - p0.X);
points.Insert(0, CmUtils.Coordinate(p0, l, rad));
points.Insert(1, CmUtils.Coordinate(p1, l, rad + MathF.PI));
Command = 'C';
return(true);
}
bool RoundSub(Vector2 pc, Vector2 pb, Vector2 pn, ref Vector2 pb2, ref Vector2 pn2, float step)
{
var a1 = MathF.Atan2(pc.Y - pb.Y, pc.X - pb.X); //傾き
var a2 = MathF.Atan2(pn.Y - pc.Y, pn.X - pc.X); //次の線の傾き
var a = (a1 + a2) / 2;
a = MathF.Abs(a);
if (a > MathF.PI)
{
a -= MathF.PI;
}
// a は中線の傾き
float lb2 = CmUtils.Length(pc, pb2);
float ln2 = CmUtils.Length(pc, pn2);
float l = MathF.Min(lb2, ln2);
var ac2 = MathF.Abs((a1 - a2) / 2);
if (ac2 > MathF.PI)
{
ac2 -= MathF.PI;
}
float r = l * MathF.Tan(ac2);
r = MathF.Round(r, 1);
if (step > 0)
{
if (r < 2)
{
step = 0.1f;
}
else if (r < 2.4)
{
step = 2.4f - r;
}
else
{
step = 0.1f;
}
}
else
{
if (r <= 2.0f)
{
step = -0.1f;
}
else if (r < 2.5)
{
step = 2.0f - r;
}
else
{
step = -0.5f;
}
}
r += step;
///
float v = 0;
v = r / MathF.Tan(a); // 半径r円の接点の頂点からの距離
float l1 = CmUtils.Length(pb, pc); // 自分の線の長さ
float l2 = CmUtils.Length(pc, pn); // 次の線の長さ
if (l1 < v || l2 < v)
{
return(false);
}
var x = MathF.Cos(a1) * v;
var y = MathF.Sin(a1) * v;
var p1 = new Vector2(pc.X - x, pc.Y - y);
x = MathF.Cos(a2) * v;
y = MathF.Sin(a2) * v;
var p2 = new Vector2(pc.X + x, pc.Y + y);
var c = r * 0.5522847f; // 半径rの円弧に近似するためのコントロールポイントの長さ
x = MathF.Cos(a1) * c;
y = MathF.Sin(a1) * c;
var c1 = new Vector2(p1.X + x, p1.Y + y);
x = MathF.Cos(a2) * c;
y = MathF.Sin(a2) * c;
var c2 = new Vector2(p2.X - x, p2.Y - y);
//
points[0] = c1;
points[1] = c2;
points[2] = p2;
pb2 = p1;
pn2 = p2;
// this.points[0] = p1;
CmUtils.DebugWriteLine(string.Format("a1:{0:0.00},a2:{1:0.00},ac:{2:0.00},r:{3:0.00}", CmUtils.ToAngle(a1), CmUtils.ToAngle(a2), CmUtils.ToAngle(ac2), r));
return(true);
}
/// <summary>
///
/// </summary>
/// <param name="pn"></param>
/// <returns></returns>
internal SvgPathItem CreateRoundCorner(Vector2 pn)
{
var pc = GetPoint();
var pb = befor.GetPoint();
var a1 = MathF.Atan2(pc.Y - pb.Y, pc.X - pb.X); //傾き
var a2 = MathF.Atan2(pn.Y - pc.Y, pn.X - pc.X); //次の線の傾き
var a = (a1 + a2) / 2;
a = MathF.Abs(a);
if (a > MathF.PI)
{
a -= MathF.PI;
}
float r = 2;
float v = 0;
v = r / MathF.Tan(a); // 半径r円の接点の頂点からの距離
float l1 = CmUtils.Length(pb, pc); // 自分の線の長さ
float l2 = CmUtils.Length(pc, pn); // 次の線の長さ
if (l1 < v || l2 < v)
{
return(null);
}
var citem = new SvgPathItem('C', this);
var x = MathF.Cos(a1) * v;
var y = MathF.Sin(a1) * v;
var p1 = new Vector2(pc.X - x, pc.Y - y);
x = MathF.Cos(a2) * v;
y = MathF.Sin(a2) * v;
var p2 = new Vector2(pc.X + x, pc.Y + y);
var c = r * 0.5522847f; // 半径rの円弧に近似するためのコントロールポイントの長さ
x = MathF.Cos(a1) * c;
y = MathF.Sin(a1) * c;
var c1 = new Vector2(p1.X + x, p1.Y + y);
x = MathF.Cos(a2) * c;
y = MathF.Sin(a2) * c;
var c2 = new Vector2(p2.X - x, p2.Y - y);
var points = new List <Vector2>();
points.Add(c1);
points.Add(c2);
points.Add(p2);
citem.SetPoints(points);
this.points[0] = p1;
CmUtils.DebugWriteLine(string.Format("a1:{0:0.00},a2:{1:0.00},vl:{2:0.00},cl:{3:0.00}", CmUtils.ToAngle(a1), CmUtils.ToAngle(a2), v, c));
return(citem);
}