/// <summary>
/// Creates a new rectangle shaped sub-path.
/// </summary>
public static void Rect(this Nvg nvg, Rectangle <float> rect)
{
InstructionQueue queue = nvg.instructionQueue;
queue.AddMoveTo(rect.Origin);
queue.AddLineTo(new(rect.Origin.X, rect.Max.Y));
queue.AddLineTo(rect.Max);
queue.AddLineTo(new(rect.Max.X, rect.Origin.Y));
queue.AddClose();
}
/// <summary>
/// Creates a new rounded rectangle shaped sub-path with varying radii for each corner.
/// </summary>
public static void RoundedRectVarying(this Nvg nvg, Rectangle <float> rect, float radTopLeft, float radTopRight, float radBottomRight, float radBottomLeft)
{
if (radTopLeft < 0.1f && radTopRight < 0.1f && radBottomRight < 0.1f && radBottomLeft < 0.1f)
{
Rect(nvg, rect);
}
else
{
InstructionQueue queue = nvg.instructionQueue;
float factor = 1 - KAPPA90;
Vector2D <float> half = Vector2D.Abs(rect.Size) * 0.5f;
Vector2D <float> rBL = new(MathF.Min(radBottomLeft, half.X) * Maths.Sign(rect.Size.X), MathF.Min(radBottomLeft, half.Y) * Maths.Sign(rect.Size.Y));
Vector2D <float> rBR = new(MathF.Min(radBottomRight, half.X) * Maths.Sign(rect.Size.X), MathF.Min(radBottomRight, half.Y) * Maths.Sign(rect.Size.Y));
Vector2D <float> rTR = new(MathF.Min(radTopRight, half.X) * Maths.Sign(rect.Size.X), MathF.Min(radTopRight, half.Y) * Maths.Sign(rect.Size.Y));
Vector2D <float> rTL = new(MathF.Min(radTopLeft, half.X) * Maths.Sign(rect.Size.X), MathF.Min(radTopLeft, half.Y) * Maths.Sign(rect.Size.Y));
queue.AddMoveTo(new(rect.Origin.X, rect.Origin.Y + rTL.Y));
queue.AddLineTo(new(rect.Origin.X, rect.Origin.Y + rect.Size.Y - rBL.Y));
queue.AddBezierTo(
new(rect.Origin.X, rect.Origin.Y + rect.Size.Y - rBL.Y * factor),
new(rect.Origin.X + rBL.X * factor, rect.Origin.Y + rect.Size.Y),
new(rect.Origin.X + rBL.X, rect.Origin.Y + rect.Size.Y)
);
queue.AddLineTo(new(rect.Origin.X + rect.Size.X - rBR.X, rect.Origin.Y + rect.Size.Y));
queue.AddBezierTo(
new(rect.Origin.X + rect.Size.X - rBR.X * factor, rect.Origin.Y + rect.Size.Y),
new(rect.Origin.X + rect.Size.X, rect.Origin.Y + rect.Size.Y - rBR.Y * factor),
new(rect.Origin.X + rect.Size.X, rect.Origin.Y + rect.Size.Y - rBR.Y)
);
queue.AddLineTo(new(rect.Origin.X + rect.Size.X, rect.Origin.Y + rTR.Y));
queue.AddBezierTo(
new(rect.Origin.X + rect.Size.X, rect.Origin.Y + rTR.Y * factor),
new(rect.Origin.X + rect.Size.X - rTR.X * factor, rect.Origin.Y),
new(rect.Origin.X + rect.Size.X - rTR.X, rect.Origin.Y)
);
queue.AddLineTo(new(rect.Origin.X + rTL.X, rect.Origin.Y));
queue.AddBezierTo(
new(rect.Origin.X + rTL.X * factor, rect.Origin.Y),
new(rect.Origin.X, rect.Origin.Y + rTL.Y * factor),
new(rect.Origin.X, rect.Origin.Y + rTL.Y)
);
queue.AddClose();
}
}
/// <summary>
/// Creates a new ellipse shaped sub-path.
/// </summary>
public static void Ellipse(this Nvg nvg, Vector2D <float> c, float rx, float ry)
{
InstructionQueue queue = nvg.instructionQueue;
queue.AddMoveTo(new(c.X - rx, c.Y));
queue.AddBezierTo(
new(c.X - rx, c.Y + ry * KAPPA90),
new(c.X - rx * KAPPA90, c.Y + ry),
new(c.X, c.Y + ry));
queue.AddBezierTo(
new(c.X + rx * KAPPA90, c.Y + ry),
new(c.X + rx, c.Y + ry * KAPPA90),
new(c.X + rx, c.Y));
queue.AddBezierTo(
new(c.X + rx, c.Y - ry * KAPPA90),
new(c.X + rx * KAPPA90, c.Y - ry),
new(c.X, c.Y - ry));
queue.AddBezierTo(
new(c.X - rx * KAPPA90, c.Y - ry),
new(c.X - rx, c.Y - ry * KAPPA90),
new(c.X - rx, c.Y));
queue.AddClose();
}