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Handle Width and Height for rotated rectangles

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This commit is contained in:
BobLd
2020-01-17 10:51:36 +00:00
committed by Eliot Jones
parent 75bd94e538
commit 27edf6cf77
1 changed files with 23 additions and 4 deletions
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27
src/UglyToad.PdfPig.Core/PdfRectangle.cs
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@@ -1,4 +1,6 @@
namespace UglyToad.PdfPig.Core
using System;
namespace UglyToad.PdfPig.Core
{
/// <summary>
/// A rectangle in a PDF file.
@@ -38,12 +40,17 @@
/// <summary>
/// Width of the rectangle.
/// </summary>
public double Width => Right - Left;
public double Width { get; }
/// <summary>
/// Height of the rectangle.
/// </summary>
public double Height => Top - Bottom;
public double Height { get; }
/// <summary>
/// Rotation angle of the rectangle. Counterclockwise, in degrees.
/// </summary>
public double Rotation { get; }
/// <summary>
/// Area of the rectangle.
@@ -86,7 +93,8 @@
/// <param name="y1">Bottom left point's y coordinate of the rectangle.</param>
/// <param name="x2">Top right point's x coordinate of the rectangle.</param>
/// <param name="y2">Top right point's y coordinate of the rectangle.</param>
public PdfRectangle(short x1, short y1, short x2, short y2) : this((double)x1, y1, x2, y2) { }
public PdfRectangle(short x1, short y1, short x2, short y2) :
this((double)x1, y1, x2, y2) { }
/// <summary>
/// Create a new <see cref="PdfRectangle"/>.
@@ -109,6 +117,17 @@
BottomLeft = bottomLeft;
BottomRight = bottomRight;
double bx = Math.Max(BottomRight.X - TopLeft.X, BottomLeft.X - TopRight.X);
double by = Math.Max(TopRight.Y - BottomLeft.Y, TopLeft.Y - BottomRight.Y);
double t = Math.Atan2(BottomRight.Y - BottomLeft.Y, BottomRight.X - BottomLeft.X);
double cosT = Math.Cos(t);
double sinT = Math.Sin(t);
double cosSqSinSqInv = 1 / (cosT * cosT - sinT * sinT);
Rotation = Math.Round(t * 180.0 / Math.PI, 5);
Width = Math.Round(cosSqSinSqInv * (bx * cosT - by * sinT), 5);
Height = Math.Round(cosSqSinSqInv * (-bx * sinT + by * cosT), 5);
}
/// <summary>