//---------------------------------------------------------------------
private static void Arrows()
{
Action <Surface> draw = surface =>
{
using (var c = new Context(surface))
{
c.Scale(300, 300);
// Is only relevant to PNG
c.Antialias = Antialias.Subpixel;
// adjust line width due scaling
double ux = 1, uy = 1;
c.DeviceToUserDistance(ref ux, ref uy);
c.LineWidth = Math.Max(ux, uy);
c.MoveTo(0, 0.1);
c.LineTo(1, 0.1);
c.MoveTo(0, 0.9);
c.LineTo(1, 0.9);
c.Stroke();
var arrow = new Arrow();
c.Color = KnownColors.Blue;
arrow.DrawArrow(c, 0.1, 0.1, 0.2, 0.9);
arrow.DrawVector(c, 0.2, 0.1, 0.3, 0.9);
arrow = new OpenArrow();
c.Color = new Color(0, 1, 0);
arrow.DrawArrow(c, 0.3, 0.1, 0.4, 0.9);
arrow.DrawVector(c, 0.4, 0.1, 0.5, 0.9);
arrow = new CircleArrow(0.01);
c.Color = new Color(1, 0, 0);
arrow.DrawArrow(c, 0.5, 0.1, 0.6, 0.9);
arrow.DrawVector(c, 0.6, 0.1, 0.7, 0.9);
}
};
using (Surface surface = new PdfSurface("arrows.pdf", 300, 300))
{
draw(surface);
// PNG can also be created this way
surface.WriteToPng("arrows.png");
}
using (Surface surface = new PSSurface("arrows.eps", 300, 300))
draw(surface);
using (Surface surface = new SvgSurface("arrows.svg", 300, 300))
draw(surface);
}
//---------------------------------------------------------------------
private static void Gradient()
{
Action <Surface> draw = surface =>
{
using (var c = new Context(surface))
{
Gradient pat = new LinearGradient(0.0, 0.0, 0.0, 256.0);
pat.AddColorStopRgba(1, 0, 0, 0, 1);
pat.AddColorStopRgba(0, 1, 1, 1, 1);
c.Rectangle(0, 0, 256, 256);
c.SetSource(pat);
c.Fill();
pat.Dispose();
pat = new RadialGradient(115.2, 102.4, 25.6,
102.4, 102.4, 128.0);
pat.AddColorStopRgba(0, 1, 1, 1, 1);
pat.AddColorStopRgba(1, 0, 0, 0, 1);
c.SetSource(pat);
c.Arc(128.0, 128.0, 76.8, 0, 2 * Math.PI);
c.Fill();
pat.Dispose();
}
};
using (Surface surface = new ImageSurface(Format.Argb32, 500, 500))
{
draw(surface);
surface.WriteToPng("gradient.png");
}
using (Surface surface = new PdfSurface("gradient.pdf", 500, 500))
{
draw(surface);
surface.WriteToPng("gradient1.png");
}
using (Surface surface = new SvgSurface("gradient.svg", 500, 500))
{
draw(surface);
surface.WriteToPng("gradient2.png");
}
}
//---------------------------------------------------------------------
private static void Hexagon()
{
Func <double, PointD[]> getHexagonPoints = cellSize =>
{
double ri = cellSize / 2;
double r = 2 * ri / Math.Sqrt(3);
var p1 = new PointD(0, r);
var p2 = new PointD(ri, r / 2);
var p3 = new PointD(ri, -r / 2);
var p4 = new PointD(0, -r);
var p5 = new PointD(-ri, -r / 2);
var p6 = new PointD(-ri, r / 2);
PointD[] hexagon = { p1, p2, p3, p4, p5, p6 };
return(hexagon);
};
Action <Surface> draw = surface =>
{
using (var c = new Context(surface))
{
c.Scale(500, 500);
// Hat nur für PNG Relevanz:
c.Antialias = Antialias.Subpixel;
// Linienweite, wegen Maßstab so:
double ux = 1, uy = 1;
c.InverseTransformDistance(ref ux, ref uy);
c.LineWidth = Math.Max(ux, uy);
PointD[] hexagon = getHexagonPoints(0.5);
c.Save();
{
c.Translate(0.5, 0.5);
c.MoveTo(hexagon[0]);
c.LineTo(hexagon[1]);
c.LineTo(hexagon[2]);
c.LineTo(hexagon[3]);
c.LineTo(hexagon[4]);
c.LineTo(hexagon[5]);
c.ClosePath();
c.Stroke();
}
c.Restore();
c.Color = new Color(0, 0, 1);
ux = 0.1; uy = 0.1;
c.InverseTransformDistance(ref ux, ref uy);
c.LineWidth = Math.Max(ux, uy);
c.MoveTo(0.5, 0);
c.LineTo(0.5, 1);
c.MoveTo(0, 0.5);
c.LineTo(1, 0.5);
c.Stroke();
}
};
using (Surface surface = new ImageSurface(Format.Argb32, 500, 500))
{
draw(surface);
surface.WriteToPng("hexagon.png");
}
using (Surface surface = new PdfSurface("hexagon.pdf", 500, 500))
{
draw(surface);
surface.WriteToPng("hexagon1.png");
}
using (Surface surface = new SvgSurface("hexagon.svg", 500, 500))
{
draw(surface);
surface.WriteToPng("hexagon2.png");
}
}
//---------------------------------------------------------------------
private static void PaintAfter()
{
Pattern pattern = null;
using (Surface surface = new SvgSurface("test.svg", 300, 300))
using (var c = new Context(surface))
{
// Draw to group
c.PushGroup();
{
var hex = new Hexagon(150);
hex.Fill(c, 150, 150, new Color(0.8, 0.8, 0.8));
}
// Get group
pattern = c.PopGroup();
c.Source = pattern;
// Draw (without mask, hence everything that's in the source)
c.Paint();
}
using (Surface pdfSurface = new PdfSurface("test1.pdf", 300, 300))
using (Surface svgSurface = new SvgSurface("test1.svg", 300, 300))
using (var c = new Context(svgSurface))
{
c.PushGroup();
{
c.Source = pattern;
c.Paint();
//pattern.Destroy();
c.Color = new Color(0, 0, 1);
c.LineWidth = 0.1;
c.MoveTo(0, 150);
c.LineTo(300, 150);
c.MoveTo(150, 0);
c.LineTo(150, 300);
c.Stroke();
c.Color = new Color(0, 0, 0);
//c.SelectFontFace("Georgia", FontSlant.Normal, FontWeight.Bold);
//c.SelectFontFace("Rockwell", FontSlant.Normal, FontWeight.Normal);
c.SelectFontFace("Arial", FontSlant.Normal, FontWeight.Normal);
//c.SelectFontFace("Times New Roman", FontSlant.Normal, FontWeight.Normal);
c.SetFontSize(16);
string text = "Hexagon with coordinate-axis";
//string text = "III";
// Determine the width of the text
double textWidth = c.GetTextWidth(text);
c.Save();
c.Translate((300 - textWidth) / 2, 16);
{
c.ShowText(text);
}
c.Restore();
c.MoveTo(0, 0);
c.LineTo(300, 300);
c.MoveTo(0, 300);
c.LineTo(300, 0);
c.Stroke();
c.Save();
c.Translate(16, 300);
c.Rotate(-Math.PI / 2);
c.Translate((300 - textWidth) / 2, 0);
{
c.ShowText(text);
}
c.Restore();
// Draw scala
c.Save();
c.Translate(270, 20);
{
// Farbverlauf:
Gradient linpat = new LinearGradient(0, 0, 0, 260);
linpat.AddColorStop(0, new Color(0, 1, 0));
linpat.AddColorStop(0.5, new Color(0, 0, 1));
linpat.AddColorStop(1, new Color(1, 0, 0));
c.Rectangle(0, 0, 20, 260);
c.Source = linpat;
//c.Fill();
c.FillPreserve();
c.Color = new Color(0, 0, 0);
c.LineWidth = 1;
//c.Rectangle(0, 0, 20, 260);
c.Stroke();
}
c.Restore();
}
pattern = c.PopGroup();
c.Source = pattern;
c.Paint();
using (var c1 = new Context(pdfSurface))
{
c1.Color = new Color(1, 1, 1, 0);
c1.Rectangle(0, 0, 300, 300);
c1.Fill();
c1.Source = pattern;
c1.Paint();
pdfSurface.WriteToPng("test1.png");
}
}
}
