moel@391: // --------------------------------------------------------------------------------------------------------------------
moel@391: // <copyright file="GraphicsRenderContext.cs" company="OxyPlot">
moel@391: //   The MIT License (MIT)
moel@391: //
moel@391: //   Copyright (c) 2012 Oystein Bjorke
moel@391: //
moel@391: //   Permission is hereby granted, free of charge, to any person obtaining a
moel@391: //   copy of this software and associated documentation files (the
moel@391: //   "Software"), to deal in the Software without restriction, including
moel@391: //   without limitation the rights to use, copy, modify, merge, publish,
moel@391: //   distribute, sublicense, and/or sell copies of the Software, and to
moel@391: //   permit persons to whom the Software is furnished to do so, subject to
moel@391: //   the following conditions:
moel@391: //
moel@391: //   The above copyright notice and this permission notice shall be included
moel@391: //   in all copies or substantial portions of the Software.
moel@391: //
moel@391: //   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
moel@391: //   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
moel@391: //   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
moel@391: //   IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
moel@391: //   CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
moel@391: //   TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
moel@391: //   SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
moel@391: // </copyright>
moel@391: // <summary>
moel@391: //   The graphics render context.
moel@391: // </summary>
moel@391: // --------------------------------------------------------------------------------------------------------------------
moel@391: namespace OxyPlot.WindowsForms
moel@391: {
moel@391:     using System;
moel@391:     using System.Collections.Generic;
moel@391:     using System.Drawing;
moel@391:     using System.Drawing.Drawing2D;
moel@391:     using System.Drawing.Imaging;
moel@391:     using System.IO;
moel@391:     using System.Linq;
moel@391: 
moel@391:     using OxyPlot;
moel@391: 
moel@391:     /// <summary>
moel@391:     /// The graphics render context.
moel@391:     /// </summary>
moel@391:     internal class GraphicsRenderContext : RenderContextBase
moel@391:     {
moel@391:         /// <summary>
moel@391:         /// The font size factor.
moel@391:         /// </summary>
moel@391:         private const float FontsizeFactor = 0.8f;
moel@391: 
moel@391:         /// <summary>
moel@391:         /// The GDI+ drawing surface.
moel@391:         /// </summary>
moel@391:         private Graphics g;
moel@391: 
moel@391:         /// <summary>
moel@391:         /// Initializes a new instance of the <see cref="GraphicsRenderContext"/> class.
moel@391:         /// </summary>
moel@391:         public GraphicsRenderContext()
moel@391:         {
moel@391:         }
moel@391: 
moel@391:         /// <summary>
moel@391:         /// Sets the graphics target.
moel@391:         /// </summary>
moel@391:         /// <param name="graphics">The graphics surface.</param>
moel@391:         public void SetGraphicsTarget(Graphics graphics)
moel@391:         {
moel@391:             this.g = graphics;
moel@391:         }
moel@391: 
moel@391:         /// <summary>
moel@391:         /// Draws the ellipse.
moel@391:         /// </summary>
moel@391:         /// <param name="rect">The rect.</param>
moel@391:         /// <param name="fill">The fill.</param>
moel@391:         /// <param name="stroke">The stroke.</param>
moel@391:         /// <param name="thickness">The thickness.</param>
moel@391:         public override void DrawEllipse(OxyRect rect, OxyColor fill, OxyColor stroke, double thickness)
moel@391:         {
moel@391:             if (fill != null)
moel@391:             {
moel@391:                 this.g.FillEllipse(
moel@391:                     this.ToBrush(fill), (float)rect.Left, (float)rect.Top, (float)rect.Width, (float)rect.Height);
moel@391:             }
moel@391: 
moel@391:             if (stroke == null || thickness <= 0)
moel@391:             {
moel@391:                 return;
moel@391:             }
moel@391: 
moel@391:             using (var pen = new Pen(this.ToColor(stroke), (float)thickness))
moel@391:             {
moel@391:                 this.g.SmoothingMode = SmoothingMode.HighQuality;
moel@391:                 this.g.DrawEllipse(pen, (float)rect.Left, (float)rect.Top, (float)rect.Width, (float)rect.Height);
moel@391:             }
moel@391:         }
moel@391: 
moel@391:         /// <summary>
moel@391:         /// Draws the line.
moel@391:         /// </summary>
moel@391:         /// <param name="points">The points.</param>
moel@391:         /// <param name="stroke">The stroke.</param>
moel@391:         /// <param name="thickness">The thickness.</param>
moel@391:         /// <param name="dashArray">The dash array.</param>
moel@391:         /// <param name="lineJoin">The line join.</param>
moel@391:         /// <param name="aliased">if set to <c>true</c> [aliased].</param>
moel@391:         public override void DrawLine(
moel@391:             IList<ScreenPoint> points,
moel@391:             OxyColor stroke,
moel@391:             double thickness,
moel@391:             double[] dashArray,
moel@391:             OxyPenLineJoin lineJoin,
moel@391:             bool aliased)
moel@391:         {
moel@391:             if (stroke == null || thickness <= 0 || points.Count < 2)
moel@391:             {
moel@391:                 return;
moel@391:             }
moel@391: 
moel@391:             this.g.SmoothingMode = aliased ? SmoothingMode.None : SmoothingMode.HighQuality;
moel@391:             using (var pen = new Pen(this.ToColor(stroke), (float)thickness))
moel@391:             {
moel@391: 
moel@391:                 if (dashArray != null)
moel@391:                 {
moel@391:                     pen.DashPattern = this.ToFloatArray(dashArray);
moel@391:                 }
moel@391: 
moel@391:                 switch (lineJoin)
moel@391:                 {
moel@391:                     case OxyPenLineJoin.Round:
moel@391:                         pen.LineJoin = LineJoin.Round;
moel@391:                         break;
moel@391:                     case OxyPenLineJoin.Bevel:
moel@391:                         pen.LineJoin = LineJoin.Bevel;
moel@391:                         break;
moel@391: 
moel@391:                     // The default LineJoin is Miter
moel@391:                 }
moel@391: 
moel@391:                 this.g.DrawLines(pen, this.ToPoints(points));
moel@391:             }
moel@391:         }
moel@391: 
moel@391:         /// <summary>
moel@391:         /// Draws the polygon.
moel@391:         /// </summary>
moel@391:         /// <param name="points">The points.</param>
moel@391:         /// <param name="fill">The fill.</param>
moel@391:         /// <param name="stroke">The stroke.</param>
moel@391:         /// <param name="thickness">The thickness.</param>
moel@391:         /// <param name="dashArray">The dash array.</param>
moel@391:         /// <param name="lineJoin">The line join.</param>
moel@391:         /// <param name="aliased">if set to <c>true</c> [aliased].</param>
moel@391:         public override void DrawPolygon(
moel@391:             IList<ScreenPoint> points,
moel@391:             OxyColor fill,
moel@391:             OxyColor stroke,
moel@391:             double thickness,
moel@391:             double[] dashArray,
moel@391:             OxyPenLineJoin lineJoin,
moel@391:             bool aliased)
moel@391:         {
moel@391:             if (points.Count < 2)
moel@391:             {
moel@391:                 return;
moel@391:             }
moel@391: 
moel@391:             this.g.SmoothingMode = aliased ? SmoothingMode.None : SmoothingMode.HighQuality;
moel@391: 
moel@391:             PointF[] pts = this.ToPoints(points);
moel@391:             if (fill != null)
moel@391:             {
moel@391:                 this.g.FillPolygon(this.ToBrush(fill), pts);
moel@391:             }
moel@391: 
moel@391:             if (stroke != null && thickness > 0)
moel@391:             {
moel@391:                 using (var pen = new Pen(this.ToColor(stroke), (float)thickness))
moel@391:                 {
moel@391: 
moel@391:                     if (dashArray != null)
moel@391:                     {
moel@391:                         pen.DashPattern = this.ToFloatArray(dashArray);
moel@391:                     }
moel@391: 
moel@391:                     switch (lineJoin)
moel@391:                     {
moel@391:                         case OxyPenLineJoin.Round:
moel@391:                             pen.LineJoin = LineJoin.Round;
moel@391:                             break;
moel@391:                         case OxyPenLineJoin.Bevel:
moel@391:                             pen.LineJoin = LineJoin.Bevel;
moel@391:                             break;
moel@391: 
moel@391:                         // The default LineJoin is Miter
moel@391:                     }
moel@391: 
moel@391:                     this.g.DrawPolygon(pen, pts);
moel@391:                 }
moel@391:             }
moel@391:         }
moel@391: 
moel@391:         /// <summary>
moel@391:         /// The draw rectangle.
moel@391:         /// </summary>
moel@391:         /// <param name="rect">
moel@391:         /// The rect.
moel@391:         /// </param>
moel@391:         /// <param name="fill">
moel@391:         /// The fill.
moel@391:         /// </param>
moel@391:         /// <param name="stroke">
moel@391:         /// The stroke.
moel@391:         /// </param>
moel@391:         /// <param name="thickness">
moel@391:         /// The thickness.
moel@391:         /// </param>
moel@391:         public override void DrawRectangle(OxyRect rect, OxyColor fill, OxyColor stroke, double thickness)
moel@391:         {
moel@391:             if (fill != null)
moel@391:             {
moel@391:                 this.g.FillRectangle(
moel@391:                     this.ToBrush(fill), (float)rect.Left, (float)rect.Top, (float)rect.Width, (float)rect.Height);
moel@391:             }
moel@391: 
moel@391:             if (stroke == null || thickness <= 0)
moel@391:             {
moel@391:                 return;
moel@391:             }
moel@391: 
moel@391:             using (var pen = new Pen(this.ToColor(stroke), (float)thickness))
moel@391:             {
moel@391:                 this.g.DrawRectangle(pen, (float)rect.Left, (float)rect.Top, (float)rect.Width, (float)rect.Height);
moel@391:             }
moel@391:         }
moel@391: 
moel@391:         /// <summary>
moel@391:         /// The draw text.
moel@391:         /// </summary>
moel@391:         /// <param name="p">
moel@391:         /// The p.
moel@391:         /// </param>
moel@391:         /// <param name="text">
moel@391:         /// The text.
moel@391:         /// </param>
moel@391:         /// <param name="fill">
moel@391:         /// The fill.
moel@391:         /// </param>
moel@391:         /// <param name="fontFamily">
moel@391:         /// The font family.
moel@391:         /// </param>
moel@391:         /// <param name="fontSize">
moel@391:         /// The font size.
moel@391:         /// </param>
moel@391:         /// <param name="fontWeight">
moel@391:         /// The font weight.
moel@391:         /// </param>
moel@391:         /// <param name="rotate">
moel@391:         /// The rotate.
moel@391:         /// </param>
moel@391:         /// <param name="halign">
moel@391:         /// The halign.
moel@391:         /// </param>
moel@391:         /// <param name="valign">
moel@391:         /// The valign.
moel@391:         /// </param>
moel@391:         /// <param name="maxSize">
moel@391:         /// The maximum size of the text.
moel@391:         /// </param>
moel@391:         public override void DrawText(
moel@391:             ScreenPoint p,
moel@391:             string text,
moel@391:             OxyColor fill,
moel@391:             string fontFamily,
moel@391:             double fontSize,
moel@391:             double fontWeight,
moel@391:             double rotate,
moel@391:             HorizontalAlignment halign,
moel@391:             VerticalAlignment valign,
moel@391:             OxySize? maxSize)
moel@391:         {
moel@391:             var fs = FontStyle.Regular;
moel@391:             if (fontWeight >= 700)
moel@391:             {
moel@391:                 fs = FontStyle.Bold;
moel@391:             }
moel@391: 
moel@391:             using (var font = new Font(fontFamily, (float)fontSize * FontsizeFactor, fs))
moel@391:             {
moel@391:                 using (var sf = new StringFormat { Alignment = StringAlignment.Near })
moel@391:                 {
moel@391:                     var size = this.g.MeasureString(text, font);
moel@391:                     if (maxSize != null)
moel@391:                     {
moel@391:                         if (size.Width > maxSize.Value.Width)
moel@391:                         {
moel@391:                             size.Width = (float)maxSize.Value.Width;
moel@391:                         }
moel@391: 
moel@391:                         if (size.Height > maxSize.Value.Height)
moel@391:                         {
moel@391:                             size.Height = (float)maxSize.Value.Height;
moel@391:                         }
moel@391:                     }
moel@391: 
moel@391:                     float dx = 0;
moel@391:                     if (halign == HorizontalAlignment.Center)
moel@391:                     {
moel@391:                         dx = -size.Width / 2;
moel@391:                     }
moel@391: 
moel@391:                     if (halign == HorizontalAlignment.Right)
moel@391:                     {
moel@391:                         dx = -size.Width;
moel@391:                     }
moel@391: 
moel@391:                     float dy = 0;
moel@391:                     sf.LineAlignment = StringAlignment.Near;
moel@391:                     if (valign == VerticalAlignment.Middle)
moel@391:                     {
moel@391:                         dy = -size.Height / 2;
moel@391:                     }
moel@391: 
moel@391:                     if (valign == VerticalAlignment.Bottom)
moel@391:                     {
moel@391:                         dy = -size.Height;
moel@391:                     }
moel@391: 
moel@391:                     this.g.TranslateTransform((float)p.X, (float)p.Y);
moel@391:                     if (Math.Abs(rotate) > double.Epsilon)
moel@391:                     {
moel@391:                         this.g.RotateTransform((float)rotate);
moel@391:                     }
moel@391: 
moel@391:                     this.g.TranslateTransform(dx, dy);
moel@391: 
moel@391:                     var layoutRectangle = new RectangleF(0, 0, size.Width, size.Height);
moel@391:                     this.g.DrawString(text, font, this.ToBrush(fill), layoutRectangle, sf);
moel@391: 
moel@391:                     this.g.ResetTransform();
moel@391:                 }
moel@391:             }
moel@391:         }
moel@391: 
moel@391:         /// <summary>
moel@391:         /// The measure text.
moel@391:         /// </summary>
moel@391:         /// <param name="text">The text.</param>
moel@391:         /// <param name="fontFamily">The font family.</param>
moel@391:         /// <param name="fontSize">The font size.</param>
moel@391:         /// <param name="fontWeight">The font weight.</param>
moel@391:         /// <returns>The size of the text.</returns>
moel@391:         public override OxySize MeasureText(string text, string fontFamily, double fontSize, double fontWeight)
moel@391:         {
moel@391:             if (text == null)
moel@391:             {
moel@391:                 return OxySize.Empty;
moel@391:             }
moel@391: 
moel@391:             var fs = FontStyle.Regular;
moel@391:             if (fontWeight >= 700)
moel@391:             {
moel@391:                 fs = FontStyle.Bold;
moel@391:             }
moel@391: 
moel@391:             using (var font = new Font(fontFamily, (float)fontSize * FontsizeFactor, fs))
moel@391:             {
moel@391:                 var size = this.g.MeasureString(text, font);
moel@391:                 return new OxySize(size.Width, size.Height);
moel@391:             }
moel@391:         }
moel@391: 
moel@391:         /// <summary>
moel@391:         /// Converts a fill color to a System.Drawing.Brush.
moel@391:         /// </summary>
moel@391:         /// <param name="fill">
moel@391:         /// The fill color.
moel@391:         /// </param>
moel@391:         /// <returns>
moel@391:         /// The brush.
moel@391:         /// </returns>
moel@391:         private Brush ToBrush(OxyColor fill)
moel@391:         {
moel@391:             if (fill != null)
moel@391:             {
moel@391:                 return new SolidBrush(this.ToColor(fill));
moel@391:             }
moel@391: 
moel@391:             return null;
moel@391:         }
moel@391: 
moel@391:         /// <summary>
moel@391:         /// Converts a color to a System.Drawing.Color.
moel@391:         /// </summary>
moel@391:         /// <param name="c">
moel@391:         /// The color.
moel@391:         /// </param>
moel@391:         /// <returns>
moel@391:         /// The System.Drawing.Color.
moel@391:         /// </returns>
moel@391:         private Color ToColor(OxyColor c)
moel@391:         {
moel@391:             return Color.FromArgb(c.A, c.R, c.G, c.B);
moel@391:         }
moel@391: 
moel@391:         /// <summary>
moel@391:         /// Converts a double array to a float array.
moel@391:         /// </summary>
moel@391:         /// <param name="a">
moel@391:         /// The a.
moel@391:         /// </param>
moel@391:         /// <returns>
moel@391:         /// The float array.
moel@391:         /// </returns>
moel@391:         private float[] ToFloatArray(double[] a)
moel@391:         {
moel@391:             if (a == null)
moel@391:             {
moel@391:                 return null;
moel@391:             }
moel@391: 
moel@391:             var r = new float[a.Length];
moel@391:             for (int i = 0; i < a.Length; i++)
moel@391:             {
moel@391:                 r[i] = (float)a[i];
moel@391:             }
moel@391: 
moel@391:             return r;
moel@391:         }
moel@391: 
moel@391:         /// <summary>
moel@391:         /// Converts a list of point to an array of PointF.
moel@391:         /// </summary>
moel@391:         /// <param name="points">
moel@391:         /// The points.
moel@391:         /// </param>
moel@391:         /// <returns>
moel@391:         /// An array of points.
moel@391:         /// </returns>
moel@391:         private PointF[] ToPoints(IList<ScreenPoint> points)
moel@391:         {
moel@391:             if (points == null)
moel@391:             {
moel@391:                 return null;
moel@391:             }
moel@391: 
moel@391:             var r = new PointF[points.Count()];
moel@391:             int i = 0;
moel@391:             foreach (ScreenPoint p in points)
moel@391:             {
moel@391:                 r[i++] = new PointF((float)p.X, (float)p.Y);
moel@391:             }
moel@391: 
moel@391:             return r;
moel@391:         }
moel@391: 
moel@391:         public override void CleanUp()
moel@391:         {
moel@391:             var imagesToRelease = imageCache.Keys.Where(i => !imagesInUse.Contains(i));
moel@391:             foreach (var i in imagesToRelease)
moel@391:             {
moel@391:                 var image = this.GetImage(i);
moel@391:                 image.Dispose();
moel@391:                 imageCache.Remove(i);
moel@391:             }
moel@391: 
moel@391:             imagesInUse.Clear();
moel@391:         }
moel@391: 
moel@391:         public override OxyImageInfo GetImageInfo(OxyImage source)
moel@391:         {
moel@391:             var image = this.GetImage(source);
moel@391:             return image == null ? null : new OxyImageInfo { Width = (uint)image.Width, Height = (uint)image.Height, DpiX = image.HorizontalResolution, DpiY = image.VerticalResolution };
moel@391:         }
moel@391: 
moel@391:         public override void DrawImage(OxyImage source, uint srcX, uint srcY, uint srcWidth, uint srcHeight, double x, double y, double w, double h, double opacity, bool interpolate)
moel@391:         {
moel@391:             var image = this.GetImage(source);
moel@391:             if (image != null)
moel@391:             {
moel@391:                 ImageAttributes ia = null;
moel@391:                 if (opacity < 1)
moel@391:                 {
moel@391:                     var cm = new ColorMatrix
moel@391:                                  {
moel@391:                                      Matrix00 = 1f,
moel@391:                                      Matrix11 = 1f,
moel@391:                                      Matrix22 = 1f,
moel@391:                                      Matrix33 = 1f,
moel@391:                                      Matrix44 = (float)opacity
moel@391:                                  };
moel@391: 
moel@391:                     ia = new ImageAttributes();
moel@391:                     ia.SetColorMatrix(cm, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
moel@391:                 }
moel@391: 
moel@391:                 g.InterpolationMode = interpolate ? InterpolationMode.HighQualityBicubic : InterpolationMode.NearestNeighbor;
moel@391:                 int sx = (int)Math.Round(x);
moel@391:                 int sy = (int)Math.Round(y);
moel@391:                 int sw = (int)Math.Round(x + w) - sx;
moel@391:                 int sh = (int)Math.Round(y + h) - sy;
moel@391:                 g.DrawImage(image, new Rectangle(sx, sy, sw, sh), srcX, srcY, srcWidth, srcHeight, GraphicsUnit.Pixel, ia);
moel@391:             }
moel@391:         }
moel@391: 
moel@391:         private HashSet<OxyImage> imagesInUse = new HashSet<OxyImage>();
moel@391: 
moel@391:         private Dictionary<OxyImage, Image> imageCache = new Dictionary<OxyImage, Image>();
moel@391: 
moel@391: 
moel@391:         private Image GetImage(OxyImage source)
moel@391:         {
moel@391:             if (source == null)
moel@391:             {
moel@391:                 return null;
moel@391:             }
moel@391: 
moel@391:             if (!this.imagesInUse.Contains(source))
moel@391:             {
moel@391:                 this.imagesInUse.Add(source);
moel@391:             }
moel@391: 
moel@391:             Image src;
moel@391:             if (this.imageCache.TryGetValue(source, out src))
moel@391:             {
moel@391:                 return src;
moel@391:             }
moel@391: 
moel@391:             if (source != null)
moel@391:             {
moel@391:                 Image btm;
moel@391:                 using (var ms = new MemoryStream(source.GetData()))
moel@391:                 {
moel@391:                     btm = Image.FromStream(ms);
moel@391:                 }
moel@391: 
moel@391:                 this.imageCache.Add(source, btm);
moel@391:                 return btm;
moel@391:             }
moel@391: 
moel@391:             return null;
moel@391:         }
moel@391: 
moel@391:         public override bool SetClip(OxyRect rect)
moel@391:         {
moel@391:             this.g.SetClip(rect.ToRect(false));
moel@391:             return true;
moel@391:         }
moel@391: 
moel@391:         public override void ResetClip()
moel@391:         {
moel@391:             this.g.ResetClip();
moel@391:         }
moel@391:     }
moel@391: }