// THIS FILE IS PART OF SVG PROJECT
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// THE SVG PROJECT IS AN OPENSOURCE LIBRARY LICENSED UNDER THE MS-PL License.
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// COPYRIGHT (C) svg-net. ALL RIGHTS RESERVED.
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// GITHUB: https://github.com/svg-net/SVG
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using System;
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using System.Drawing;
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using System.Drawing.Drawing2D;
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namespace AntdUI.Svg
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{
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/// <summary>
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/// It is often desirable to specify that a given set of graphics stretch to fit a particular container element. The viewBox attribute provides this capability.
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/// </summary>
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public struct SvgViewBox
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{
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public static readonly SvgViewBox Empty = new SvgViewBox();
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/// <summary>
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/// Gets or sets the position where the viewport starts horizontally.
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/// </summary>
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public float MinX { get; set; }
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/// <summary>
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/// Gets or sets the position where the viewport starts vertically.
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/// </summary>
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public float MinY { get; set; }
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/// <summary>
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/// Gets or sets the width of the viewport.
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/// </summary>
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public float Width { get; set; }
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/// <summary>
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/// Gets or sets the height of the viewport.
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/// </summary>
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public float Height { get; set; }
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/// <summary>
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/// Performs an implicit conversion from <see cref="Svg.SvgViewBox"/> to <see cref="System.Drawing.RectangleF"/>.
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/// </summary>
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/// <param name="value">The value.</param>
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/// <returns>The result of the conversion.</returns>
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public static implicit operator RectangleF(SvgViewBox value)
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{
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return new RectangleF(value.MinX, value.MinY, value.Width, value.Height);
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}
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/// <summary>
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/// Performs an implicit conversion from <see cref="System.Drawing.RectangleF"/> to <see cref="Svg.SvgViewBox"/>.
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/// </summary>
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/// <param name="value">The value.</param>
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/// <returns>The result of the conversion.</returns>
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public static implicit operator SvgViewBox(RectangleF value)
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{
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return new SvgViewBox(value.X, value.Y, value.Width, value.Height);
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="SvgViewBox"/> struct.
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/// </summary>
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/// <param name="minX">The min X.</param>
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/// <param name="minY">The min Y.</param>
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/// <param name="width">The width.</param>
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/// <param name="height">The height.</param>
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public SvgViewBox(float minX, float minY, float width, float height) : this()
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{
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MinX = minX;
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MinY = minY;
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Width = width;
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Height = height;
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}
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#region Equals and GetHashCode implementation
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public override bool Equals(object obj)
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{
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return (obj is SvgViewBox) && Equals((SvgViewBox)obj);
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}
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public bool Equals(SvgViewBox other)
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{
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return MinX == other.MinX
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&& MinY == other.MinY
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&& Width == other.Width
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&& Height == other.Height;
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}
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public override int GetHashCode()
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{
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int hashCode = 0;
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unchecked
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{
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hashCode += 1000000007 * MinX.GetHashCode();
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hashCode += 1000000009 * MinY.GetHashCode();
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hashCode += 1000000021 * Width.GetHashCode();
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hashCode += 1000000033 * Height.GetHashCode();
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}
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return hashCode;
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}
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public static bool operator ==(SvgViewBox lhs, SvgViewBox rhs)
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{
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return lhs.Equals(rhs);
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}
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public static bool operator !=(SvgViewBox lhs, SvgViewBox rhs)
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{
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return !(lhs == rhs);
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}
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#endregion
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public void AddViewBoxTransform(SvgAspectRatio aspectRatio, ISvgRenderer renderer, SvgFragment frag)
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{
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var x = (frag == null ? 0 : frag.X.ToDeviceValue(renderer, UnitRenderingType.Horizontal, frag));
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var y = (frag == null ? 0 : frag.Y.ToDeviceValue(renderer, UnitRenderingType.Vertical, frag));
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if (Equals(SvgViewBox.Empty))
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{
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renderer.TranslateTransform(x, y, MatrixOrder.Prepend);
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return;
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}
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var width = (frag == null ? Width : frag.Width.ToDeviceValue(renderer, UnitRenderingType.Horizontal, frag));
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var height = (frag == null ? Height : frag.Height.ToDeviceValue(renderer, UnitRenderingType.Vertical, frag));
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var fScaleX = width / Width;
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var fScaleY = height / Height; //(MinY < 0 ? -1 : 1) *
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var fMinX = -MinX * fScaleX;
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var fMinY = -MinY * fScaleY;
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if (aspectRatio == null) aspectRatio = new SvgAspectRatio(SvgPreserveAspectRatio.xMidYMid, false);
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if (aspectRatio.Align != SvgPreserveAspectRatio.none)
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{
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if (aspectRatio.Slice)
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{
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fScaleX = Math.Max(fScaleX, fScaleY);
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fScaleY = Math.Max(fScaleX, fScaleY);
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}
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else
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{
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fScaleX = Math.Min(fScaleX, fScaleY);
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fScaleY = Math.Min(fScaleX, fScaleY);
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}
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float fViewMidX = (Width / 2) * fScaleX;
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float fViewMidY = (Height / 2) * fScaleY;
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float fMidX = width / 2;
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float fMidY = height / 2;
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fMinX = -MinX * fScaleX;
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fMinY = -MinY * fScaleY;
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switch (aspectRatio.Align)
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{
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case SvgPreserveAspectRatio.xMinYMin:
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break;
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case SvgPreserveAspectRatio.xMidYMin:
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fMinX += fMidX - fViewMidX;
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break;
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case SvgPreserveAspectRatio.xMaxYMin:
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fMinX += width - Width * fScaleX;
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break;
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case SvgPreserveAspectRatio.xMinYMid:
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fMinY += fMidY - fViewMidY;
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break;
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case SvgPreserveAspectRatio.xMidYMid:
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fMinX += fMidX - fViewMidX;
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fMinY += fMidY - fViewMidY;
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break;
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case SvgPreserveAspectRatio.xMaxYMid:
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fMinX += width - Width * fScaleX;
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fMinY += fMidY - fViewMidY;
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break;
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case SvgPreserveAspectRatio.xMinYMax:
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fMinY += height - Height * fScaleY;
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break;
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case SvgPreserveAspectRatio.xMidYMax:
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fMinX += fMidX - fViewMidX;
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fMinY += height - Height * fScaleY;
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break;
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case SvgPreserveAspectRatio.xMaxYMax:
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fMinX += width - Width * fScaleX;
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fMinY += height - Height * fScaleY;
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break;
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default:
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break;
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}
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}
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renderer.TranslateTransform(x, y, MatrixOrder.Prepend);
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renderer.TranslateTransform(fMinX, fMinY, MatrixOrder.Prepend);
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renderer.ScaleTransform(fScaleX, fScaleY, MatrixOrder.Prepend);
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}
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}
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internal class SvgViewBoxConverter
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{
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public static SvgViewBox Parse(string value)
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{
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var coords = (value).Split(new char[] { ',', ' ' }, StringSplitOptions.RemoveEmptyEntries);
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if (coords.Length != 4) throw new SvgException("The 'viewBox' attribute must be in the format 'minX, minY, width, height'.");
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return new SvgViewBox(float.Parse(coords[0]), float.Parse(coords[1]), float.Parse(coords[2]), float.Parse(coords[3]));
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}
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}
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}
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