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improve mbr by removing PdfPoints creation

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This commit is contained in:
BobLd
2020-04-02 21:35:42 +01:00
committed by Eliot Jones
parent e382e581ba
commit 93c19d72ec
1 changed files with 48 additions and 23 deletions
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71
src/UglyToad.PdfPig/Geometry/GeometryExtensions.cs
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@@ -81,71 +81,93 @@
return new PdfRectangle(polygon[0], polygon[1]); return new PdfRectangle(polygon[0], polygon[1]);
} }
PdfPoint[] MBR = new PdfPoint[0]; double[] MBR = new double[8];
double Amin = double.PositiveInfinity; double Amin = double.PositiveInfinity;
int j = 1; int j = 1;
int k = 0; int k = 0;
PdfPoint Q = new PdfPoint(); double QX = double.NaN;
PdfPoint R0 = new PdfPoint(); double QY = double.NaN;
PdfPoint R1 = new PdfPoint(); double R0X = double.NaN;
PdfPoint u = new PdfPoint(); double R0Y = double.NaN;
double R1X = double.NaN;
double R1Y = double.NaN;
while (true) while (true)
{ {
PdfPoint Pk = polygon[k]; PdfPoint Pk = polygon[k];
PdfPoint v = polygon[j].Subtract(Pk); PdfPoint Pj = polygon[j];
double r = 1.0 / v.DotProduct(v);
double vX = Pj.X - Pk.X;
double vY = Pj.Y - Pk.Y;
double r = 1.0 / (vX * vX + vY * vY);
double tmin = 1; double tmin = 1;
double tmax = 0; double tmax = 0;
double smax = 0; double smax = 0;
int l = -1; int l = -1;
double uX;
double uY;
for (j = 0; j < polygon.Count; j++) for (j = 0; j < polygon.Count; j++)
{ {
PdfPoint Pj = polygon[j]; Pj = polygon[j];
u = Pj.Subtract(Pk); uX = Pj.X - Pk.X;
double t = u.DotProduct(v) * r; uY = Pj.Y - Pk.Y;
PdfPoint Pt = new PdfPoint(t * v.X + Pk.X, t * v.Y + Pk.Y); double t = (uX * vX + uY * vY) * r;
u = Pt.Subtract(Pj);
double s = u.DotProduct(u); double PtX = t * vX + Pk.X;
double PtY = t * vY + Pk.Y;
uX = PtX - Pj.X;
uY = PtY - Pj.Y;
double s = uX * uX + uY * uY;
if (t < tmin) if (t < tmin)
{ {
tmin = t; tmin = t;
R0 = Pt; R0X = PtX;
R0Y = PtY;
} }
if (t > tmax) if (t > tmax)
{ {
tmax = t; tmax = t;
R1 = Pt; R1X = PtX;
R1Y = PtY;
} }
if (s > smax) if (s > smax)
{ {
smax = s; smax = s;
Q = Pt; QX = PtX;
QY = PtY;
l = j; l = j;
} }
} }
if (l != -1) if (l != -1)
{ {
PdfPoint PlMinusQ = polygon[l].Subtract(Q); PdfPoint Pl = polygon[l];
PdfPoint R2 = R1.Add(PlMinusQ); double PlMinusQX = Pl.X - QX;
PdfPoint R3 = R0.Add(PlMinusQ); double PlMinusQY = Pl.Y - QY;
u = R1.Subtract(R0); double R2X = R1X + PlMinusQX;
double R2Y = R1Y + PlMinusQY;
double A = u.DotProduct(u) * smax; double R3X = R0X + PlMinusQX;
double R3Y = R0Y + PlMinusQY;
uX = R1X - R0X;
uY = R1Y - R0Y;
double A = (uX * uX + uY * uY) * smax;
if (A < Amin) if (A < Amin)
{ {
Amin = A; Amin = A;
MBR = new[] { R0, R1, R2, R3 }; MBR = new[] { R0X, R0Y, R1X, R1Y, R2X, R2Y, R3X, R3Y };
} }
} }
@@ -156,7 +178,10 @@
if (k == polygon.Count) break; if (k == polygon.Count) break;
} }
return new PdfRectangle(MBR[2], MBR[3], MBR[1], MBR[0]); return new PdfRectangle(new PdfPoint(MBR[4], MBR[5]),
new PdfPoint(MBR[6], MBR[7]),
new PdfPoint(MBR[2], MBR[3]),
new PdfPoint(MBR[0], MBR[1]));
} }
/// <summary> /// <summary>