/// <summary>
/// Draws multiple lines. Every two points define a separate line.
/// </summary>
/// <param name="points">The points.</param>
/// <param name="style">The style.</param>
public void Segments(IEnumerable <Vector2> points, string classes = null)
{
var sb = new StringBuilder(128);
var it = points.GetEnumerator();
while (it.MoveNext())
{
var first = it.Current;
if (!it.MoveNext())
{
return;
}
var second = it.Current;
first = CurrentTransform.Apply(first);
second = CurrentTransform.Apply(second);
_bounds.Expand(first);
_bounds.Expand(second);
if (sb.Length > 0)
{
sb.Append(" ");
}
sb.Append($"M {Convert(first.X)} {Convert(first.Y)} L {Convert(second.X)} {Convert(second.Y)}");
}
var path = _document.CreateElement("path", Namespace);
path.SetAttribute("d", sb.ToString());
if (!string.IsNullOrWhiteSpace(classes))
{
path.SetAttribute("class", classes);
}
_current.AppendChild(path);
}
/// <summary>
/// Draws a polygon (a closed shape of straight lines).
/// </summary>
/// <param name="points">The points.</param>
/// <param name="classes">The classes.</param>
public void Polygon(IEnumerable <Vector2> points, string classes = null, string id = null)
{
var sb = new StringBuilder(32);
bool isFirst = true;
foreach (var point in points)
{
if (isFirst)
{
isFirst = false;
}
else
{
sb.Append(" ");
}
var pt = CurrentTransform.Apply(point);
_bounds.Expand(pt.X, pt.Y);
sb.Append($"{Convert(pt.X)},{Convert(pt.Y)}");
}
var poly = _document.CreateElement("polygon", Namespace);
poly.SetAttribute("points", sb.ToString());
if (!string.IsNullOrWhiteSpace(classes))
{
poly.SetAttribute("class", classes);
}
if (!string.IsNullOrWhiteSpace(id))
{
poly.SetAttribute("id", id);
}
_current.AppendChild(poly);
}
/// <summary>
/// Draws a line.
/// </summary>
/// <param name="start">The start.</param>
/// <param name="end">The end.</param>
/// <param name="style">The style.</param>
public void Line(Vector2 start, Vector2 end, string classes = null, string id = null)
{
start = CurrentTransform.Apply(start);
end = CurrentTransform.Apply(end);
// Expand the bounds
_bounds.Expand(start.X, start.Y);
_bounds.Expand(end.X, end.Y);
var line = _document.CreateElement("line", Namespace);
line.SetAttribute("x1", Convert(start.X));
line.SetAttribute("y1", Convert(start.Y));
line.SetAttribute("x2", Convert(end.X));
line.SetAttribute("y2", Convert(end.Y));
if (!string.IsNullOrWhiteSpace(classes))
{
line.SetAttribute("class", classes);
}
if (!string.IsNullOrWhiteSpace(id))
{
line.SetAttribute("id", id);
}
_current.AppendChild(line);
}
/// <summary>
/// Closed bezier curve.
/// </summary>
/// <param name="pointsAndHandles">The points and handles.</param>
/// <param name="classes">The classes.</param>
/// <param name="id">The identifier.</param>
public void ClosedBezier(IEnumerable <Vector2> pointsAndHandles, string classes = null, string id = null)
{
var sb = new StringBuilder(128);
var it = pointsAndHandles.GetEnumerator();
bool isFirst = true;
while (it.MoveNext())
{
if (isFirst)
{
var m = CurrentTransform.Apply(it.Current);
sb.Append($"M{Convert(m.X)} {Convert(m.Y)} ");
_bounds.Expand(m);
isFirst = false;
}
else
{
var h1 = CurrentTransform.Apply(it.Current);
if (!it.MoveNext())
{
break;
}
var h2 = CurrentTransform.Apply(it.Current);
if (!it.MoveNext())
{
break;
}
var end = CurrentTransform.Apply(it.Current);
sb.Append($"C{Convert(h1.X)} {Convert(h1.Y)}, {Convert(h2.X)} {Convert(h2.Y)}, {Convert(end.X)} {Convert(end.Y)} ");
_bounds.Expand(h1);
_bounds.Expand(h2);
_bounds.Expand(end);
}
}
// Close the path
sb.Append("Z");
var path = _document.CreateElement("path", Namespace);
path.SetAttribute("d", sb.ToString());
if (!string.IsNullOrWhiteSpace(classes))
{
path.SetAttribute("class", classes);
}
if (!string.IsNullOrWhiteSpace(id))
{
path.SetAttribute("id", id);
}
_current.AppendChild(path);
}
/// <summary>
/// Draws a circle.
/// </summary>
/// <param name="position">The position.</param>
/// <param name="radius">The radius.</param>
/// <param name="style">The style.</param>
public void Circle(Vector2 position, double radius, string classes = null, string id = null)
{
position = CurrentTransform.Apply(position);
// Expand the bounds
_bounds.Expand(position.X - radius, position.Y - radius);
_bounds.Expand(position.X + radius, position.Y + radius);
var circle = _document.CreateElement("circle", Namespace);
circle.SetAttribute("cx", Convert(position.X));
circle.SetAttribute("cy", Convert(position.Y));
circle.SetAttribute("r", Convert(radius));
if (!string.IsNullOrWhiteSpace(classes))
{
circle.SetAttribute("class", classes);
}
if (!string.IsNullOrWhiteSpace(id))
{
circle.SetAttribute("id", id);
}
_current.AppendChild(circle);
}
/// <summary>
/// Draws text.
/// </summary>
/// <param name="value">The value.</param>
/// <param name="location">The location.</param>
/// <param name="expand">The direction of the quadrant that the text can expand to.</param>
/// <param name="classes">The classes.</param>
public void Text(string value, Vector2 location, Vector2 expand, double fontSize = 4, double midLineFactor = 0.33, string classes = null, string id = null)
{
location = CurrentTransform.Apply(location);
expand = CurrentTransform.ApplyDirection(expand);
if (string.IsNullOrWhiteSpace(value))
{
return;
}
var lines = value.Split(new char[] { '\r', '\n', '\\' });
var width = 0.0;
foreach (var l in lines)
{
var w = 0.0;
foreach (var c in l)
{
w += char.IsLower(c) ? LowerCharacterWidth : UpperCharacterWidth;
}
width = Math.Max(width, w);
}
var height = lines.Length * LineHeight;
// Create the text element
var text = _document.CreateElement("text", Namespace);
// Expand the X-direction
if (expand.X.IsZero())
{
text.SetAttribute("text-anchor", "middle");
_bounds.Expand(location - new Vector2(width / 2, 0));
_bounds.Expand(location + new Vector2(width / 2, 0));
}
else if (expand.X > 0)
{
text.SetAttribute("text-anchor", "start");
_bounds.Expand(location);
_bounds.Expand(location + new Vector2(width, 0));
}
else
{
text.SetAttribute("text-anchor", "end");
_bounds.Expand(location - new Vector2(width, 0));
_bounds.Expand(location);
}
// Draw the text with multiple lines
if (expand.Y.IsZero())
{
_bounds.Expand(location - new Vector2(0, LineHeight * lines.Length / 2));
_bounds.Expand(location + new Vector2(0, LineHeight * lines.Length / 2));
// Center everything
var dy = -(height - LineHeight) * 0.5;
foreach (var l in lines)
{
var tspan = _document.CreateElement("tspan", Namespace);
tspan.InnerText = l;
tspan.SetAttribute("y", Convert(location.Y + dy + fontSize * midLineFactor));
tspan.SetAttribute("x", Convert(location.X));
text.AppendChild(tspan);
dy += LineHeight;
}
}
else if (expand.Y > 0)
{
_bounds.Expand(location);
_bounds.Expand(location + new Vector2(0, LineHeight * lines.Length));
// Make sure everything is below
double dy = 0;
foreach (var l in lines)
{
var tspan = _document.CreateElement("tspan", Namespace);
tspan.InnerText = l;
tspan.SetAttribute("y", Convert(location.Y + dy + fontSize));
tspan.SetAttribute("x", Convert(location.X));
text.AppendChild(tspan);
dy += LineHeight;
}
}
else
{
_bounds.Expand(location - new Vector2(0, LineHeight * lines.Length));
_bounds.Expand(location);
// Make sure everything is above
double dy = -height + LineHeight;
foreach (var l in lines)
{
var tspan = _document.CreateElement("tspan", Namespace);
tspan.InnerText = l;
tspan.SetAttribute("y", Convert(location.Y + dy));
tspan.SetAttribute("x", Convert(location.X));
text.AppendChild(tspan);
dy += LineHeight;
}
}
text.SetAttribute("x", Convert(location.X));
text.SetAttribute("y", Convert(location.Y));
text.SetAttribute("font-size", $"{Convert(fontSize)}pt");
if (!string.IsNullOrWhiteSpace(classes))
{
text.SetAttribute("class", classes);
}
if (!string.IsNullOrWhiteSpace(id))
{
text.SetAttribute("id", id);
}
_current.AppendChild(text);
}
/// <summary>
/// Draws a smooth bezier curve.
/// </summary>
/// <param name="points">The points.</param>
/// <param name="classes">The classes.</param>
public void SmoothBezier(IEnumerable <Vector2> points, string classes = null, string id = null)
{
var sb = new StringBuilder(128);
var it = points.GetEnumerator();
bool isFirst = true;
Vector2 end;
while (it.MoveNext())
{
if (isFirst)
{
Vector2 first = CurrentTransform.Apply(it.Current);
if (!it.MoveNext())
{
return;
}
// Get the handles
var handle1 = CurrentTransform.Apply(it.Current);
if (!it.MoveNext())
{
return;
}
var handle2 = CurrentTransform.Apply(it.Current);
if (!it.MoveNext())
{
return;
}
end = CurrentTransform.Apply(it.Current);
// Expand bounds
_bounds.Expand(first);
_bounds.Expand(handle1);
_bounds.Expand(handle2);
_bounds.Expand(end);
// Add the data
sb.Append($"M{Convert(first.X)} {Convert(first.Y)} ");
sb.Append($"C{Convert(handle1.X)} {Convert(handle1.Y)}, ");
sb.Append($"{Convert(handle2.X)} {Convert(handle2.Y)}, ");
sb.Append($"{Convert(end.X)} {Convert(end.Y)}");
isFirst = false;
}
else
{
var handle = CurrentTransform.Apply(it.Current);
if (!it.MoveNext())
{
return;
}
end = CurrentTransform.Apply(it.Current);
_bounds.Expand(handle);
_bounds.Expand(end);
// Add the data
sb.Append($" S{Convert(handle.X)} {Convert(handle.Y)} ");
sb.Append($"{Convert(end.X)} {Convert(end.Y)}");
}
}
var path = _document.CreateElement("path", Namespace);
path.SetAttribute("d", sb.ToString());
if (!string.IsNullOrWhiteSpace(classes))
{
path.SetAttribute("class", classes);
}
if (!string.IsNullOrWhiteSpace(id))
{
path.SetAttribute("id", id);
}
_current.AppendChild(path);
}