move pdfline to the core project

src/UglyToad.PdfPig.Core/PdfLine.cs

@@ -0,0 +1,93 @@
+namespace UglyToad.PdfPig.Core
+{
+    using System;
+
+    /// <summary>
+    /// A line in a PDF file. 
+    /// </summary>
+    /// <remarks>
+    /// PDF coordinates are defined with the origin at the lower left (0, 0).
+    /// The Y-axis extends vertically upwards and the X-axis horizontally to the right.
+    /// Unless otherwise specified on a per-page basis, units in PDF space are equivalent to a typographic point (1/72 inch).
+    /// </remarks>
+    public struct PdfLine
+    {
+        /// <summary>
+        /// Length of the line.
+        /// </summary>
+        public double Length
+        {
+            get
+            {
+                var l = (Point1.X - Point2.X) * (Point1.X - Point2.X) + 
+                    (Point1.Y - Point2.Y) * (Point1.Y - Point2.Y);
+                return Math.Sqrt(l);
+            }
+        }
+
+        /// <summary>
+        /// First point of the line.
+        /// </summary>
+        public PdfPoint Point1 { get; }
+
+        /// <summary>
+        /// Second point of the line.
+        /// </summary>
+        public PdfPoint Point2 { get; }
+
+        /// <summary>
+        /// Create a new <see cref="PdfLine"/>.
+        /// </summary>
+        /// <param name="x1">The x coordinate of the first point on the line.</param>
+        /// <param name="y1">The y coordinate of the first point on the line.</param>
+        /// <param name="x2">The x coordinate of the second point on the line.</param>
+        /// <param name="y2">The y coordinate of the second point on the line.</param>
+        public PdfLine(double x1, double y1, double x2, double y2) : this(new PdfPoint(x1, y1), new PdfPoint(x2, y2)) { }
+
+        /// <summary>
+        /// Create a new <see cref="PdfLine"/>.
+        /// </summary>
+        /// <param name="point1">First point of the line.</param>
+        /// <param name="point2">Second point of the line.</param>
+        public PdfLine(PdfPoint point1, PdfPoint point2)
+        {
+            Point1 = point1;
+            Point2 = point2;
+        }
+
+        /// <summary>
+        /// The rectangle completely containing the <see cref="PdfLine"/>.
+        /// </summary>
+        public PdfRectangle GetBoundingRectangle()
+        {
+            return new PdfRectangle(
+                Math.Min(Point1.X, Point2.X),
+                Math.Min(Point1.Y, Point2.Y),
+                Math.Max(Point1.X, Point2.X),
+                Math.Max(Point1.Y, Point2.Y));
+        }
+
+        /// <summary>
+        /// Returns a value indicating whether this <see cref="PdfLine"/> is equal to a specified <see cref="PdfLine"/> .
+        /// </summary>
+        /// <param name="obj"></param>
+        /// <returns></returns>
+        public override bool Equals(object obj)
+        {
+            if (obj is PdfLine line)
+            {
+                return line.Point1.Equals(Point1) && line.Point2.Equals(Point2);
+            }
+            return false;
+        }
+
+        /// <summary>
+        /// Returns the hash code for this <see cref="PdfLine"/>.
+        /// </summary>
+        /// <returns></returns>
+        public override int GetHashCode()
+        {
+            return (Point1, Point2).GetHashCode();
+        }
+    }
+}