/// <summary>
/// PointD constructor
/// </summary>
/// <param name="L1">Line 1</param>
/// <param name="L2">Line 2</param>
public PointD
(
LineD L1,
LineD L2
)
{
double Denom = L1.DX * L2.DY - L1.DY * L2.DX;
if (Denom == 0.0)
{
X = double.NaN;
Y = double.NaN;
return;
}
double L1DXY = L1.P2.X * L1.P1.Y - L1.P2.Y * L1.P1.X;
double L2DXY = L2.P2.X * L2.P1.Y - L2.P2.Y * L2.P1.X;
X = (L1DXY * L2.DX - L2DXY * L1.DX) / Denom;
Y = (L1DXY * L2.DY - L2DXY * L1.DY) / Denom;
return;
}
public PointD
(
LineD L1,
LineD L2
)
{
Double L1DX = L1.DX;
Double L1DY = L1.DY;
Double L2DX = L2.DX;
Double L2DY = L2.DY;
Double Denom = L1DX * L2DY - L1DY * L2DX;
if (Denom == 0.0)
{
X = Double.NaN;
Y = Double.NaN;
return;
}
X = (L1.DXY * L2.DX - L2.DXY * L1.DX) / Denom;
Y = (L1.DXY * L2.DY - L2.DXY * L1.DY) / Denom;
return;
}
////////////////////////////////////////////////////////////////////
/// <summary>
/// Draw double Bezier path
/// </summary>
/// <param name="CenterLine">Center line</param>
/// <param name="Factor1">Factor 1</param>
/// <param name="Alpha1">Alpha 1</param>
/// <param name="Factor2">Factor 2</param>
/// <param name="Alpha2">Alpha 2</param>
/// <param name="PP">Paint operator</param>
////////////////////////////////////////////////////////////////////
public void DrawDoubleBezierPath(
LineD CenterLine,
Double Factor1,
Double Alpha1,
Double Factor2,
Double Alpha2,
PaintOp PP
)
{
// two symmetric Bezier curves
DrawBezier(new BezierD(CenterLine.P1, Factor1, -0.5 * Alpha1, Factor2, -0.5 * Alpha2, CenterLine.P2), BezierPointOne.MoveTo);
DrawBezier(new BezierD(CenterLine.P2, Factor2, Math.PI + 0.5 * Alpha2, Factor1, Math.PI + 0.5 * Alpha1, CenterLine.P1), BezierPointOne.Ignore);
// set paint operator
SetPaintOp(PP);
return;
}
////////////////////////////////////////////////////////////////////
/// <summary>
/// Draw star
/// </summary>
/// <param name="Center">Center position</param>
/// <param name="Radius">Radius</param>
/// <param name="Alpha">Initial angle</param>
/// <param name="Sides">Number of sides</param>
/// <param name="PP">Paint operator</param>
////////////////////////////////////////////////////////////////////
public void DrawStar(
PointD Center,
Double Radius,
Double Alpha,
Int32 Sides,
PaintOp PP
)
{
// inner radius
Double Radius1 = 0;
// for polygon with less than 5, set inner radius to half the main radius
if(Sides < 5)
{
Radius1 = 0.5 * Radius;
}
// for polygons with 5 sides, calculate inner radius
else
{
// polygon angle
Double DeltaAlpha = 2.0 * Math.PI / Sides;
// first line
LineD L1 = new LineD(new PointD(Center, Radius, Alpha), new PointD(Center, Radius, Alpha + 2.0 * DeltaAlpha));
// second line
LineD L2 = new LineD(new PointD(Center, Radius, Alpha - DeltaAlpha), new PointD(Center, Radius, Alpha + DeltaAlpha));
// inner radius
Radius1 = (new PointD(L1, L2)).Distance(Center);
}
// draw star
DrawStar(Center, Radius, Radius1, Alpha, Sides, PP);
return;
}
////////////////////////////////////////////////////////////////////
/// <summary>
/// Draw line with given line width
/// </summary>
/// <param name="Line">Line</param>
/// <param name="LineWidth">Line width</param>
////////////////////////////////////////////////////////////////////
public void DrawLine(
LineD Line,
Double LineWidth
)
{
DrawLine(Line.P1.X, Line.P1.Y, Line.P2.X, Line.P2.Y, LineWidth);
return;
}
////////////////////////////////////////////////////////////////////
/// <summary>
/// Draw line
/// </summary>
/// <param name="Line">Line object</param>
////////////////////////////////////////////////////////////////////
public void DrawLine(
LineD Line
)
{
DrawLine(Line.P1.X, Line.P1.Y, Line.P2.X, Line.P2.Y);
return;
}
////////////////////////////////////////////////////////////////////
/// <summary>
/// Draw heart
/// </summary>
/// <param name="CenterLine">Center line</param>
/// <param name="PP">Paint operator</param>
/// <remarks>
/// <para>
/// <a href="http://www.codeproject.com/Articles/570682/PDF-File-Writer-Csharp-Class-Library-Version#DrawHeart">For example of drawing heart see 3.10. Draw Heart</a>
/// </para>
/// </remarks>
////////////////////////////////////////////////////////////////////
public void DrawHeart(
LineD CenterLine,
PaintOp PP
)
{
// PI / 1.5 = 120 deg and PI / 2 = 90 deg
DrawDoubleBezierPath(CenterLine, 1.0, Math.PI / 1.5, 1.0, 0.5 * Math.PI, PP);
return;
}
/// <summary>
/// PointD constructor
/// </summary>
/// <param name="L1">Line 1</param>
/// <param name="L2">Line 2</param>
public PointD(
LineD L1,
LineD L2
)
{
Double L1DX = L1.DX;
Double L1DY = L1.DY;
Double L2DX = L2.DX;
Double L2DY = L2.DY;
Double Denom = L1DX * L2DY - L1DY * L2DX;
if(Denom == 0.0)
{
X = Double.NaN;
Y = Double.NaN;
return;
}
X = (L1.DXY * L2.DX - L2.DXY * L1.DX) / Denom;
Y = (L1.DXY * L2.DY - L2.DXY * L1.DY) / Denom;
return;
}
/// <summary>
/// Bezier constructor
/// </summary>
/// <param name="P1">P1</param>
/// <param name="Factor2">Factor2</param>
/// <param name="Alpha2">Alpha2</param>
/// <param name="Factor3">Factor3</param>
/// <param name="Alpha3">Alpha3</param>
/// <param name="P4">P4</param>
public BezierD(
PointD P1,
Double Factor2,
Double Alpha2,
Double Factor3,
Double Alpha3,
PointD P4
)
{
// save two end points
this.P1 = P1;
this.P4 = P4;
// distance between end points
LineD Line = new LineD(P1, P4);
Double Length = Line.Length;
if(Length == 0)
{
P2 = P1;
P3 = P4;
return;
}
// angle of line between end points
Double Alpha = Line.Alpha;
this.P2 = new PointD(P1, Factor2 * Length, Alpha + Alpha2);
this.P3 = new PointD(P4, Factor3 * Length, Alpha + Alpha3);
return;
}
