public static Color ColorFromHSV(double hue, double saturation, double value)
{
int hi = Convert.ToInt32(Math.Floor(hue / 60)) % 6;
double f = hue / 60 - Math.Floor(hue / 60);
value = value * 255;
byte v = Convert.ToByte(value);
byte p = Convert.ToByte(value * (1 - saturation));
byte q = Convert.ToByte(value * (1 - f * saturation));
byte t = Convert.ToByte(value * (1 - (1 - f) * saturation));
if (hi == 0)
{
return(CairoEx.ColorArgb(255, v, t, p));
}
if (hi == 1)
{
return(CairoEx.ColorArgb(255, q, v, p));
}
if (hi == 2)
{
return(CairoEx.ColorArgb(255, p, v, t));
}
if (hi == 3)
{
return(CairoEx.ColorArgb(255, p, q, v));
}
if (hi == 4)
{
return(CairoEx.ColorArgb(255, t, p, v));
}
return(CairoEx.ColorArgb(255, v, p, q));
}
public void Read(string fontFileName, char character, string expectedImageFilePath)
{
Typeface typeFace;
using (var fs = Utility.ReadFile(Utility.FontDir + fontFileName))
{
var reader = new OpenFontReader();
typeFace = reader.Read(fs);
}
Typography.OpenFont.Glyph glyph = typeFace.Lookup(character);
// read polygons and bezier segments
GlyphLoader.Read(glyph, out var polygons, out var bezierSegments);
Rect aabb = new Rect(polygons[0][0], polygons[0][1]);
//print to test output
//calcualte the aabb
for (int i = 0; i < polygons.Count; i++)
{
o.WriteLine("Polygon " + i);
var polygon = polygons[i];
foreach (var p in polygon)
{
aabb.Union(p);
o.WriteLine("{0}, {1}", (int)p.X, (int)p.Y);
}
o.WriteLine("");
}
foreach (var segment in bezierSegments)
{
aabb.Union(segment.Item1);
aabb.Union(segment.Item2);
aabb.Union(segment.Item3);
o.WriteLine("<{0}, {1}> <{2}, {3}> <{4}, {5}>",
(int)segment.Item1.X, (int)segment.Item1.Y,
(int)segment.Item2.X, (int)segment.Item2.Y,
(int)segment.Item3.X, (int)segment.Item3.Y);
}
o.WriteLine("");
// draw to an image
using (Cairo.ImageSurface surface = new Cairo.ImageSurface(Cairo.Format.Argb32, MathEx.RoundToInt(aabb.Width), MathEx.RoundToInt(aabb.Height)))
using (Cairo.Context g = new Cairo.Context(surface))
{
g.Translate(-aabb.Min.X, -aabb.Min.Y);
//essential: set surface back ground to white (1,1,1,1)
g.SetSourceColor(CairoEx.ColorWhite);
g.Paint();
for (var i = 0; i < polygons.Count; i++)
{
var polygon = polygons[i];
g.MoveTo(polygon[0].X, polygon[0].Y);
foreach (var point in polygon)
{
g.LineTo(point.X, point.Y);
}
g.ClosePath();
}
g.SetSourceColor(new Cairo.Color(0, 0, 0));
g.LineWidth = 4;
g.StrokePreserve();
g.SetSourceColor(new Cairo.Color(0.8, 0, 0, 0.6));
g.Fill();
foreach (var segment in bezierSegments)
{
var p0 = segment.Item1;
var c = segment.Item2;
var p1 = segment.Item3;
g.MoveTo(p0.X, p0.Y);
g.QuadraticTo(c.X, c.Y, p1.X, p1.Y);
}
g.LineWidth = 4;
g.SetSourceColor(CairoEx.ColorRgb(0, 122, 204));
g.Stroke();
//used to generate expected image
//surface.WriteToPng($"{Util.OutputPath}\\GlyphReaderFacts.TheReadMethod.Read_{fontFileName}_{character}.png");
var image = Image.LoadPixelData <Bgra32>(Configuration.Default, surface.Data, surface.Width, surface.Height);
var expectedImage = Image.Load(expectedImageFilePath);
Assert.True(Util.CompareImage(expectedImage, image));
}
}
public void Read(string fontFileName, char character, int fontSize)
{
Typeface typeFace;
using (var fs = Utility.ReadFile(Utility.FontDir + fontFileName))
{
var reader = new OpenFontReader();
typeFace = reader.Read(fs);
}
Glyph glyph = typeFace.Lookup(character);
// read polygons and bezier segments
GlyphLoader.Read(glyph, out var polygons, out var bezierSegments);
Rect aabb = new Rect(polygons[0][0], polygons[0][1]);
//print to test output
//calcualte the aabb
for (int i = 0; i < polygons.Count; i++)
{
o.WriteLine("Polygon " + i);
var polygon = polygons[i];
foreach (var p in polygon)
{
aabb.Union(p);
o.WriteLine("{0}, {1}", (int)p.X, (int)p.Y);
}
o.WriteLine("");
}
foreach (var segment in bezierSegments)
{
aabb.Union(segment.Item1);
aabb.Union(segment.Item2);
aabb.Union(segment.Item3);
o.WriteLine("<{0}, {1}> <{2}, {3}> <{4}, {5}>",
(int)segment.Item1.X, (int)segment.Item1.Y,
(int)segment.Item2.X, (int)segment.Item2.Y,
(int)segment.Item3.X, (int)segment.Item3.Y);
}
o.WriteLine("");
// draw to an image
using (Cairo.ImageSurface surface = new Cairo.ImageSurface(Cairo.Format.Argb32, 2000, 2000))
using (Cairo.Context g = new Cairo.Context(surface))
{
g.Translate(-aabb.Min.X, -aabb.Min.Y);
for (var i = 0; i < polygons.Count; i++)
{
var polygon = polygons[i];
g.MoveTo(polygon[0].X, polygon[0].Y);
foreach (var point in polygon)
{
g.LineTo(point.X, point.Y);
}
g.ClosePath();
}
g.SetSourceColor(new Cairo.Color(0, 0, 0));
g.LineWidth = 2;
g.StrokePreserve();
g.SetSourceColor(new Cairo.Color(0.8, 0, 0, 0.6));
g.Fill();
foreach (var segment in bezierSegments)
{
var p0 = segment.Item1;
var c = segment.Item2;
var p1 = segment.Item3;
g.MoveTo(p0.X, p0.Y);
g.QuadraticTo(c.X, c.Y, p1.X, p1.Y);
}
g.LineWidth = 4;
g.SetSourceColor(CairoEx.ColorRgb(0, 122, 204));
g.Stroke();
var path =
$"{OutputPath}\\GlyphReaderFacts.TheReadMethod.Read_{fontFileName}_{character}_{fontSize}.png";
surface.WriteToPng(path);
Util.OpenImage(path);
// Now inspect the image to check whether the glyph is correct
// TODO Are there a better way to do such kind of unit-test?
}
}
